VS2.5 Transmitter Troubleshooting Manual - Home - …€¦ · · 2016-05-13VS2.5 Transmitter Troubleshooting Manual Document:VS2.5-TROUBLESHOOT Issue: 0.2 2010-12-17 Status: Preliminary

VS2.5 Transmitter

Troubleshooting Manual

Document:VS2.5-TROUBLESHOOT

Issue: 0.2 2010-12-17

Status: Preliminary

Nautel Limited10089 Peggy’s Cove RoadHackett’s Cove, NS Canada B3Z 3J4Phone: +1.902.823.3900 orToll Free: +1.877.6NAUTEL (6628835) (Canada & USA only)Fax: +1.902.823.3183

Nautel Inc. 201 Target Industrial Circle Bangor, Maine USA 04401 Phone: +1.207.947.8200 Fax: +1.207.947.3693

Customer Service (24 hour support) +1.877.628.8353 (Canada & USA only)+1.902.823.5100 (International)

Email: [email protected]: www.nautel.com

The comparisons and other information provided in this document have been prepared in good faith based on publicly available information. The reader is encouraged to consult the respective manufacturer's most recent published data for verification.

© Copyright 2010 NAUTEL. All rights reserved.

mailto:[email protected]

http://www.nautel.com

VS2.5 Troubleshooting Manual Table of contents

Page v

Contents

Release control record ix

About this manual xi

About safety xv

Safety precautions xvii

Responding to alarms 1-1

Corrective maintenance 1-1Electrostatic protection 1-3Identifying an alarm 1-4Troubleshooting tips 1-25Operating with defective PAs or cooling fans 1-26Replacing a suspect PWB, power supply or fan 1-27PA PWB replacement 1-29Pre-amp/IPA PWB replacement 1-31Power Supply Module Replacement 1-34+48 V Power Supply Replacement 1-35Cooling fan replacement - fans 3 (B3) through 7 (B7) 1-36Cooling fan replacement - fans 1 (B1) and 2 (B2) 1-38Exciter/Control PWB Replacement 1-40PS Distribution PWB Replacement 1-43Combiner Interface PWB Replacement 1-45

Detailed Circuit Descriptions 2-1

Exciter/control PWB (NAPE83A) 2-1PS distribution PWB (NAPS43) 2-2


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Pre-amp/IPA PWB (NAPA28A) 2-3Power amplifier PWB (NAPA31) 2-4

Parts Lists 3-1

Parts information 3-1Family tree 3-1How to locate information about a specific part 3-1Column content 3-2OEM code to manufacturer’s cross-reference 3-3Common abbreviations/acronyms 3-4

Wiring/connector lists 4-1

Wiring lists provided 4-1Wiring lists not provided 4-1Connector mating information 4-1Wire colours 4-1Printed wiring board patterns 4-1

Reading Electrical Schematics 5-1

Component values 5-1Graphic symbols 5-1Logic symbols 5-1Reference designations 5-1Unique symbols 5-2Identifying schematic diagrams 5-2Structure of schematics 5-2Locating schematic diagram(s) for a functional block 5-3Locating a part or assembly on a schematic 5-3

Mechanical Drawings 6-1

Identifying mechanical drawings 6-1Content of mechanical drawings 6-1


Issue 0.2 2010-12-17 Page vii

Locating a part or assembly on a mechanical drawing 6-1

List of terms 7-1


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VS2.5 Troubleshooting Manual

Issue 0.2 2010-12-17 Page ix

Release control record

Issue Date Reason

0.1 2010-10-01 Initial release of manual

0.2 2010-12-17 Pre-amp/IPA PWB A5 changed to NAPA28A. Affects replacement procedure in section 1, parts list in section 3, wiring list in section 4


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Issue 0.2 2010-12-17 Page xi

About this manual

This manual provides troubleshooting information for the VS2.5 transmitter. It is intended for use by field technicians. This manual allows the troubleshooting technician to diagnose a fault to the system level, using alarm response procedures, parts lists, wiring lists, and electrical schematics. Electrical schematics and mechanical drawings are included at the end of the manual.

Performing procedures

When using procedures in this manual, perform each step in sequence.

• If you are asked to see another section of this manual, or another document, refer to that section or document for additional information, then continue the procedure.

• If you are asked to go to another step within the procedure, jump directly to that step with-out performing the intervening steps.

• If you are asked to go to another section or document, stop the procedure and perform the tasks described in the other section or document.

• If you are asked to check a voltage, use a digital voltmeter and test the voltage relative to ground (unless otherwise instructed).

• If you are asked to check a signal, use an oscilloscope and test the signal relative to ground (unless otherwise instructed).

Technical support

Nautel offers technical support to customers over the Internet and by telephone. Nautel’s customer support team will answer your questions and work with you to identify and resolve problems.

For 24-hour technical support, call toll free at 1.877.628.8353 (in USA and Canada only) or call 1.902.823.5100 (international) or find us on the Internet at http://www.nautel.com.

For parts and tools information, see “Parts and tools” on page 9-1 of the VS2.5 Pre-Installation Manual.



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For extended warranty information, see “Pre-installation assistance” on page 10-1 of the VS2.5 Pre-Installation Manual.

VS2.5 transmitter manuals

The VS2.5 documentation suite includes the following documents:

VS2.5 Pre-installation Manual, VS2.5-PREINST. Provides instructions and reference information needed when planning and preparing for the installation of a VS2.5 transmitter.

Nautel Site Protection Manual. Provides detailed information about protecting your site from lightning-related hazards.

VS2.5 Installation Manual, VS2.5-INST. Provides instructions and reference information needed when installing a VS2.5 transmitter.

VS2.5 Operating and Maintenance Manual, VS2.5-OPS-MAINT. Provides instructions for operating, maintaining and troubleshooting a VS2.5 transmitter. It also provides reference information needed when performing diagnostic procedures.

VS2.5 Troubleshooting Manual, VS2.5-TROUBLE. Provides detailed technical information about the VS2.5 transmitter, including electrical schematics and mechanical drawings.

Nautel website / Online resources

The Nautel website provides useful resources to keep you up to date on your VS2.5.

Nautel User Group (NUG)

The website includes a special section that customers can log into in order to access the Nautel customer newsletter, product manuals, frequently asked questions (FAQ), information sheets, and information about field upgrades.

Documentation: online and printed

The website’s NUG section provides online access to all the documentation for your VS2.5. Documentation is provided in Acrobat (PDF) format. You can use the documentation online or print the sections that you need.

When using online documents:


Issue 0.2 2010-12-17 Page xiii

• Click on blue text (hyperlinks) to jump to a related section, or to get additional information (e.g., view a term’s definition).

• To search a document to find keywords, use Find in Acrobat Reader’s Edit menu.

• To quickly find a specific section, click the section in the PDF file’s Bookmarks list.

When using printed documents:

• To find a specific term, go to the List of Terms section near the end of the manual.


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About safety

All Nautel transmitters are designed to meet the requirements of EN60215, Safety Requirements for Radio Transmitters.

The philosophy of EN60215 is that the removal of any cover or panel that can only be opened using a tool is a maintenance activity, and that any person performing a maintenance activity is expected to be trained for that activity. Under EN60215, it is assumed that trained personnel will be knowledgeable and will take precautions such as removing all power to the transmitter before accessing its components.

Electrical hazards

To remove power from the transmitter, switch off and lock out the ac power.

DANGER - HIGH VOLTAGE

Indicates dangerous voltage (in excess of 72 volts), capable of causing a fatal electrical shock, are present on or near parts bearing this label.

After turning off the ac power, always perform a measurement to confirm that the power is off before touching anything within the transmitter. If the wrong breaker was opened, the equipment will be live.

Use only a non-contact voltage probe or a safety voltmeter (available from vendors such as Fluke, Ideal, and Teagam).

Use a proper lockout procedure to ensure that another worker cannot accidentally reapply power while you are performing maintenance on any part of the transmitter or site.

WARNING: It is not enough to switch off RF power. The power line is

still connected. Disconnect and lock out the upstream supply before

servicing.

WARNING: Do not use an ordinary multimeter to check for voltage,

since it may have been left inadvertently on the AMP (A) range,

triggering a short and an arc blast that could result in severe burns

and even death.


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Lightning hazards

Before opening the transmitter and touching internal parts, remove and solidly ground the antenna connection.

RF hazards

A serious RF hazard and very high voltages exist in the vicinity of the antenna and its networks during normal operations.

Toxic hazards

Some devices used in this equipment contain beryllium oxide ceramic, which is non-hazardous during normal device operation and under normal device failure conditions. These devices are specifically identified with “(BeO)” in the Description column of the Troubleshooting Manual’s parts list(s).

Do not cut, crush or grind devices because the resulting dust may be hazardous if inhaled. Unserviceable devices should be disposed of as harmful waste.

Physical hazards

DANGER - MOVING BLADES

Fan blades can cause injury. Lock out power before removing safety features.

Other hazards

Ensure that appropriate fire alarms and fire extinguishers are available. Extinguishers must be suitable for use on electrical fires.

Many other site safety risks exist. It is beyond the scope of this manual to identify all the risks and procedures.

WARNING: It is not enough to ground the antenna terminal with the

antenna still connected. Even a small impedance in the ground strap

will result in lethal voltages during a lightning strike.


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Safety precautions

This section provides very important information about protecting the safety of personnel and equipment:

• Personal safety - see page xvii

• Site safety - see page xviii

• Equipment safety - see page xx

Personal safety

Training

The training of any personnel who will have physical access to the site or the transmitter is very important. Personnel must be familiar with the transmitter, so that they can avoid physical danger, and be aware of hazards to themselves and the equipment.

Nautel offers a number of training courses covering the basic fundamentals of RF systems and transmitters, and the operation and maintenance of the transmitter. For more information about available courses and schedules, go to the Nautel website at http://www.nautel.com/Training.aspx, or ask your Nautel sales representative.

Site orientation

When you give personnel access to the transmitter site (e.g., hiring new personnel, or giving access keys to personnel), perform a site orientation to ensure that they are familiar with the site, on-site procedures, and on-site hazards. Cover the following topics:

• Securing the site (locking doors and fences) to prevent unauthorized access

• How and when to call for technical support or emergency assistance

• Areas of the site and pieces of equipment that are off limits


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Voltage awareness

Ensure that all personnel that are able to access areas with high voltage circuits or high field strengths are aware of the hazards associated with high voltage. Cover the following topics:

• High voltage or high field strength areas where caution is required

• Physical risks of electric shock

• Risks for personnel with pacemakers or other medical implants

• Induced voltages in high field strength areas

• On-site risks during thunderstorms and lightning strikes

• Operation of safety interlocks (if installed)

First aid

Nautel does not offer first aid training, since the hazards associated with high voltage and RF energyare not specific to the transmitter. However, the customer should provide first aid training to all per-sonnel who have access to the transmitter site. First aid training should include CPR, care of burns,artificial respiration, and defibrillation if specific equipment is available on-site.

Site safety

Controlling access

Transmitters and antennas generate and carry dangerous voltages that can be harmful or fatal. It is very important that you control access to the site and its equipment. To secure your transmitter site, use:

• Locking steel or security doors to prevent casual access

• A perimeter fence to keep trespassers away from the antenna system and feedline

• “No Trespassing” signs

• An alarm system


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Marking hazards

Place warning signs close to any hazardous areas or systems (e.g., the feedline or the antenna system). Make the signs large enough that they cannot be missed. Provide signage in all languages used in the region. These signs are intended not only for authorized personnel, but also for emergency responders or accidental trespassers.

Qualifying site personnel

Make sure that personnel who have access to the site are qualified to work around electronics and high voltage systems.

Ac power protection

You should take steps to protect equipment from surges (over-voltage spikes) on the ac power lines. Surges may occur during thunderstorms, or because of malfunctions in the electrical distribution grid. Surge suppressors and ac power conditioners can prevent serious damage to your on-site equipment, including the transmitter.

RF protection

Transmitters and their antenna systems create intense radio frequency fields at the transmitter site, particularly near the feedline, antenna and tower. At some sites, these fields may cause biological effects, including the heating of body tissues. Intense fields can also create dangerous high voltages on ungrounded, conductive surfaces and objects. At certain points where high voltage conductors come close to grounded conductors (e.g., at feedline junctions or on the tower), dangerous electrical arcing or flashovers can occur. It is very important that you take the following steps to prevent damage to equipment or personnel due to RF fields:

• Use safety interlocks to de-energize transmitters if personnel open doors or panels accessing high field areas

• Place warning signs in any locations where high fields can occur

• Train personnel about the short-term and long-term hazards of RF radiation

• Physically block access to the area around the antenna system, feedline and tower

• Ground all exposed conductive surfaces or objects in high field areas

The RF connection to the transmitter output can be a serious safety hazard. Connect a 50 Ω test load during installation and commissioning. It is recommended that a switch be used to automatically connect the transmitter to the antenna system without human contact with the transmitting conductors.


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Safety interlocks

The transmitter contains an electrical interlock, which is an external circuit that turns off the RF output if any of its switches are opened.

Equipment safety

Electrostatic protection

The transmitter’s systems are very rugged and resistant to damage. However, it is possible for damage to occur because of high voltage electrostatic discharges during servicing. Train all service personnel to ground themselves to bleed off any static charge before opening the transmitter or touching any exposed components. Provide a grounding wand or known ground (e.g., a grounded metal table) that personnel can use to discharge themselves.

Surge protection

Surge protection is recommended for your entire site. However, even if you do not use a surge protector on the service entrance to the site, you should install a surge protector in the transmitter’s ac power feed to prevent over-voltage from entering the transmitter.

Lightning protection

The transmitter is designed to resist lightning strike damage. However, intense or repeated strikes could damage the transmitter. We recommend that you install lightning suppression on the antenna, tower and feedline to reduce the effect of lightning strikes on the transmitter itself (and to protect the rest of your site equipment and your personnel). For detailed information about lightning protection, see the Nautel Site Preparation Manual, available from your Nautel sales agent, or online from the Nautel website.

Physical protection

Consider physical hazards to equipment at your site, including the transmitter. Ensure that equipment is protected from weather (e.g., rain or flooding), even during extreme weather events. Place equipment so that it is not in the path of swinging doors or high-traffic areas. Do not allow wheeled items like office chairs or tables with wheels in the transmitter room, as these may damage equipment if accidentally pushed or knocked over. Do not place the transmitter under water pipes, drains, or sprinklers. Keep any equipment that generates heat, like the transmitter, away from flammable materials like ceiling panels, cubicle dividers, and curtains.

VS2.5 Troubleshooting Manual Responding to alarms

Issue 0.2 2010-12-17 Page 1-1

Section 1: Responding to alarms

This section provides instructions you need when performing troubleshooting on the VS2.5 transmitter. This section includes the following topics:

• Corrective maintenance

• Electrostatic protection - see page 1-3

• Identifying an alarm - see page 1-4

• Troubleshooting tips - see page 1-25

– AUI lockup - see page 1-25

• Operating with defective PAs or cooling fans - see page 1-26

• Replacing a suspect PWB, power supply or fan - see page 1-27

If none of the procedures and alarms described in this section address your problem, contact Nautel for assistance. See “Technical support” on page viii.

Corrective maintenance

Corrective maintenance procedures consist of identifying and correcting defects or deficiencies that arise during transmitter operation. Local and/or remote alarm signals are generated when a malfunction occurs. If an alarm condition is caused by a malfunction in the RF power stage, the transmitter may maintain operation at a reduced RF output level. The nature of the fault – and station policy – will dictate whether an immediate maintenance response is necessary. Fault analysis and rectification may be conducted from three different levels, with a different technical competence level required for each: on-air troubleshooting, remote or local, and off-air troubleshooting.

On-air troubleshooting

On-air troubleshooting can be performed from a remote location, or locally at the transmitter site.

CAUTION: The transmitter contains many solid state devices that may be damaged if subjected to excessive heat or high voltage transients. Every effort must be taken to ensure that circuits are not overdriven or disconnected from their loads while turned on.


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Remote troubleshooting

Remote on-air troubleshooting consists of monitoring the transmitter's radiated signal using an on-air monitor or via a LAN connection, and observing the status of each remote fault alarm indicator. Information obtained from these sources should enable an operator to decide whether an alarm response may be deferred to a more convenient time, an immediate corrective action must be taken, or if a standby transmitter must be enabled (if one is available). It is recommended that the significance of remote indications, and the appropriate responses, be incorporated into a station's standard operating procedures. Refer to “Identifying an alarm” on page 1-4 to determine the remedial action required for a given fault.

Local troubleshooting

Local on-air troubleshooting consists of monitoring the transmitter's integral meters and fault alarm indicators. Analysis of this data will normally identify the type of fault, and in most cases will determine what corrective action must be taken. Refer to “Identifying an alarm” on page 1-4 to determine the remedial action required for a given fault.

The power amplifier stage contains an integral modular reserve (IMR) feature. This feature permits the transmitter to operate at a reduced RF output level when a malfunction occurs in one of its power modules. Station operating procedures will dictate whether a reduced RF output level is acceptable. When a reduced RF output level can be tolerated, replacement of the defective RF components may be deferred to a convenient time.

Off-air troubleshooting

Off-air troubleshooting must be performed when routine on-air calibration adjustments will not restore operation.

It is recommended that the transmitter’s output be connected to a precision 50 Ω resistive dummy load (rated for at least the maximum transmitter power rating of 2500 W) before starting off-air troubleshooting procedures. If an appropriate dummy load is not available, troubleshooting for a majority of faults can be performed with the RF power stage turned off. The transmitter may remain connected to its antenna system for these procedures.

CAUTION: Reduce the RF output level to a minimal value when troubleshooting faults in the transmitter. This is particularly important when the transmitter’s cover is removed - where possible overheating could occur - or when the transmitter is connected to the antenna system.


Issue 0.2 2010-12-17 Page 1-3

Electrostatic protection

The transmitter's assemblies contain semiconductor devices that are susceptible to damage from electrostatic discharge. The following precautions must be observed when handling an assembly which contains these devices.

Electrical discharging of personnel

Personnel should be electrically discharged by a suitable grounding system (e.g., anti-static mats, grounding straps) when removing an assembly from the transmitter, and while handling the assembly for maintenance procedures.

Handling/Storage

An assembly should be placed in an anti-static bag when it is not installed in a host transmitter, or when it is not undergoing maintenance. Electronic components should be stored in anti-static materials.

Tools/Test equipment

Testing and maintenance equipment – including soldering and unsoldering tools – should be suitable (i.e., grounded tip) for contact with static sensitive semiconductor devices.

Stress current protection

Every precaution should be taken to ensure the static sensitive semiconductor devices are protected from unnecessary stress current. This is achieved by ensuring that current is not flowing when an electrical connection is broken, and that voltages are not present on external control/monitoring circuits when they are connected.

CAUTION: Electrostatic energy is produced when two insulating materials are rubbed together. A person wearing rubber-soled shoes, walking across a nylon carpet or a waxed floor, can generate an extremely large electrostatic charge. This effect is magnified during periods of low humidity. Semiconductor devices such as integrated circuits, field-effect transistors, thyristors and Schottky diodes may be damaged by this high voltage unless adequate precautions are taken.


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Identifying an alarm

You can identify an alarm locally by viewing the front panel (see “Front panel alarm checks”) or remotely by viewing the AUI’s Transmitter Status page (see “AUI Transmitter status page checks” on page 1-6).

Front panel alarm checks

There two ways to check for alarms on the front panel:

• Alarm/status LEDs

• View alarms screen - see page 1-5

Alarm/status LEDs

There are four LEDs on the left-hand side of the LCD display that provide information about the operational status of various sections of the transmitter - Exciter, Power Amplifier, Output Network and Power Supply (see Figure 1.1). The LEDs can glow green, amber or red. Typically, green indicates normal operation, amber indicates a warning, and red indicates a fault or error.

Figure 1.1: Alarm/Status LEDs

When an LED is:

• green - transmitter is on, with no known faults.

• amber - a fault is present that may cause a reduction in RF power, but the transmitter is still producing RF power.

• red - a fault is present and the transmitter is not producing RF power.

When a fault is present, the transmitter may still produce an RF output. In this case, or if the transmitter has shut down, you should schedule and commence more in-depth fault diagnosis. See “View alarms screen” on page 1-5.

ExciterPower AmplifierOutput Network

Power Supply


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View alarms screen

If an alarm exists and is currently being recognized by the transmitter system, it is displayed in the View Alarms screen (Main Menu -> View Status -> View Alarms) of the front panel Display (see Figure 1.2).

Figure 1.2: View Alarms Screen

Table 1.1 on page 1-8 contains a column for most alarms that can occur, sorted alphanumerically. The Description and Troubleshooting Action column provides a brief description of the alarm, troubleshooting tips and a cross-reference to more detailed troubleshooting, if applicable.

1. Scroll through the View Alarms screen to view the active faults.

2. Attempt to clear any latching alarms by pressing the checkmark button in the Main Menu -> Reset Alarms screen. If the alarm persists, it will not clear from the display.

3. Locate the alarm name in Table 1.1 on page 1-8 to determine the cause of the alarm and perform any recommended procedures in the Description and Troubleshooting Action column. This may also lead to replacing a suspect PWB, power supply or fan, as detailed in “Replacing a suspect PWB, power supply or fan” on page 1-27.

4. If troubleshooting and subsequent replacement of a suspect PWB or module causes the alarm to disappear from the View Alarms screen, the alarm has been successfully cleared. If the alarm does not remove the fault condition, contact Nautel.

NOTE: Before undertaking any troubleshooting, record all meter readings and note if any other alarms are displayed on the View Alarms page. Record all alarms.

NOTE: Table 1.1 on page 1-8 contains a column for most Alarms that can occur, sorted alphanumerically for each sub-system, including both the names displayed on the AUI and, if different, the front panel UI (in parentheses).

The Description and Troubleshooting Action column provides a brief description of the alarm, troubleshooting tips and a cross-reference to more detailed troubleshooting, as applicable.


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AUI Transmitter status page checks

If an alarm exists and is being recognized by the transmitter, it is displayed under the Alarms tab of the transmitter status page (see Figure 1.3). The Device name indicates the sub-system origin of the alarm. The sub-systems that can be displayed are:

– Controller: All alarms in this sub-system apply to the controller.– Exciter: All alarms in this sub-system apply to the exciter.

Figure 1.3: Transmitter Status Page

1. If an alarm exists, the Status button at the bottom of the AUI display will be red. Click the Status button to go to the Transmitter Status page (see Figure 1.3). View the list of active faults by pressing the Alarms tab. Alarms are listed by their origin (Device column), then by name (Alarm column), and then by severity [1 = low (RF output not affected), 5 = medium (RF output is reduced), 10 = high (RF output is inhibited); see Level column].

2. Attempt to clear any latching alarms by pressing the Reset button on the bottom banner of the page. If the alarm persists, it will not be cleared from the display.


Issue 0.2 2010-12-17 Page 1-7

3. Locate the alarm name in Table 1.1 on page 1-8 to determine the cause of the alarm and perform any recommended procedures in the Description and Troubleshooting Action column. This may also lead to replacing a suspect PWB, power supply or fan, as detailed in “Replacing a suspect PWB, power supply or fan” on page 1-27.

4. If troubleshooting and subsequent replacement of a suspect PWB or module causes the alarm to disappear from the Transmitter Status page, the alarm has been successfully cleared. If the fault condition does not clear, contact Nautel.

.

NOTE: Table 1.1 on page 1-8 contains a column for most Alarms that can occur, sorted alphanumerically for each sub-system, including both the names displayed on the AUI and, if different, the front panel UI (in parentheses).

The Description and Troubleshooting Action column provides a brief description of the alarm, troubleshooting tips and a cross-reference to more detailed troubleshooting, as applicable.

NOTE: Before undertaking any troubleshooting, record all AUI meter readings and note if any other alarms are displayed on the Transmitter Status page. Record all alarms. The most convenient way to do this is by using a web browser over a LAN connection to save screen shots of critical status, meter and alarm pages. From the System Review page, press the information (!) button for each sub-device (Controller and Exciter) to view (and save) detailed information (see “Viewing real-time meters” on page 2-32 of the Operations and Maintenance Manual).


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Table 1.1: Troubleshooting Alarms

Alarm NameAUI and (Front Panel)

Front Panel LED (color) Description and Troubleshooting Action

+1.2V Supply Fail(+1.2V Fail)

PS (red) This alarm occurs if the +1.2 V supply on the exciter/control PWB (A1) is outside of its acceptable voltage range (between +1.1 V and +1.3 V). The VS2.5 takes no action on this alarm. Check for a +5V Supply Fail alarm: If present, follow the associated troubleshooting procedure. If not present, use a digital multimeter to measure between TP5 (+1.2 V) and TP6 (ground) of the exciter/control PWB. If the measured value is within the acceptable range, suspect the sampling circuitry on the exciter/control PWB (A1). If not, use a digital multimeter to measure between TP7 and TP6 (ground). The measured voltage should be between +4.5 V and +5.5 V. If the measured voltage is within the acceptable range, the power supply circuitry on the exciter/control PWB has failed. Replace the exciter/control PWB (see “Exciter/Control PWB Replacement” on page 1-40). If not, check ribbon cable W4 for damage, and verify connectors W4P1 and W4P2 are properly seated in A1J11 and A2J6 respectively. If there are no visible problems with the ribbon cable, contact Nautel for further support.


PS (red) This alarm occurs if the +1.8 V supply on the exciter/control PWB (A1) is outside of its acceptable voltage range (between +1.6 V and +2.0 V). The VS2.5 takes no action on this alarm. Check for a +3.3V Supply Fail alarm: If present, follow the associated troubleshooting procedure. If not present, use a digital multimeter to measure between TP4 and TP6 of the exciter/control PWB. If the measured value is within the acceptable range, suspect the sampling circuitry on the exciter/control PWB. If not, the power supply circuitry has failed on the exciter/control PWB. If necessary, replace the exciter/control PWB (see “Exciter/Control PWB Replacement” on page 1-40).


Issue 0.2 2010-12-17 Page 1-9

+15V Supply Fail(+15V Fail)

PS (amber) This alarm occurs if the +15 V supply from the PS distribution PWB (A2) is outside of its acceptable voltage range (between +13.5 V and +16.5 V). The VS2.5 takes no action on this alarm. Check for a +48V Supply Fail alarm: If present, follow the associated troubleshooting procedure. If not present, use a digital multimeter to measure between TP1 (+15 V) and TP3 (ground) of the PS distribution PWB. If the measured value is not within the acceptable range, the power supply circuitry on the PS distribution PWB has likely failed. If the measured value is within the acceptable range, check ribbon cable W2 for damage and that connectors W2P1 and W2P2 are properly seated in A1J12 and A2J7 respectively. If there are no visible problems with the ribbon cable, suspect the sampling circuitry on the PS distribution PWB. If necessary, replace the PS distribution PWB (see “PS Distribution PWB Replacement” on page 1-43). If the alarm persists after replacing the PS distribution PWB, suspect the exciter/control PWB (A1).

-15V Supply Fail(-15V Fail)

PS (amber) This alarm occurs if the -15 V supply on exciter/control PWB (A1) is outside of its acceptable voltage range (between -13.5 V and -16.5 V). The VS2.5 takes no action on this alarm. Check for a +15V Supply Fail alarm: If present, follow the associated troubleshooting procedure. If not present, use a digital multimeter to measure between TP13 and TP11 (ground) of the exciter/control PWB. If the measured value is within the acceptable range, suspect the sampling circuitry on the exciter/control PWB. If not, use a digital multimeter to measure between TP2 and TP6 (ground). The measured voltage should be between +13.5 V and +16.5 V. If the measured voltage is within the acceptable range, the power supply circuitry on the exciter/control PWB has failed. Replace the exciter/control PWB (see “Exciter/Control PWB Replacement” on page 1-40). If not, check ribbon cable W4 for damage and that connectors W4P1 and W4P2 are properly seated in A1J11 and A2J6 respectively. If there are no visible problems with the ribbon cable, contact Nautel for further support.




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PS (red) This alarm occurs if the +3.3 V supply on the exciter/control PWB (A1) is outside of its acceptable voltage range (between +3.0 V and +3.6 V). The VS2.5 takes no action on this alarm. Check for a +5V Supply Fail alarm: If present, follow the associated troubleshooting procedure. If not present, use a digital multimeter to measure between TP3 (+3.3 V) and TP6 (ground) of the exciter/control PWB. If the measured value is within the acceptable range, suspect the sampling circuitry on the exciter/control PWB. If not, use a digital multimeter to measure between TP7 and TP6 (ground). The measured voltage should be between +4.5 V and +5.5 V. If the measured voltage is within the acceptable range, the power supply circuitry on the exciter/control PWB has failed. Replace the exciter/control PWB (see “Exciter/Control PWB Replacement” on page 1-40). If not, check ribbon cable W4 for damage and that connectors W4P1 and W4P2 are properly seated in A1J11 and A2J6 respectively. If there are no visible problems with the ribbon cable, contact Nautel for further support.


PS (red) This alarm occurs if the output of the +48 V power supply (U4) is outside of its acceptable voltage range (between +43 and +53 V). The VS2.5 takes no action on this alarm. Use a digital multimeter to measure between +V and -V of the +48 V power supply. If the measured value is not within the acceptable range, replace the +48 V power supply (see “+48 V Power Supply Replacement” on page 1-35). If the measured value is within the acceptable range, use a digital multimeter to measure the voltage between TP4 (+48V) and TP3 (ground) on the PS distribution PWB (A2). If the measured value is not within the acceptable range, suspect the connection between the +48V power supply and the PS distribution PWB, and contact Nautel for further assistance. If the measured value is within the acceptable range, check ribbon cable W2 for damage and that W2P1 and W2P2 are properly seated in A1J12 and A2J7 respectively. If there are no visible problems with the ribbon cable, suspect the sampling circuitry on the PS distribution PWB. If necessary, replace the PS distribution PWB (see “PS Distribution PWB Replacement” on page 1-43). If the alarm persists after replacing the PS distribution PWB, suspect the exciter/control PWB (A1).




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PS (red) This alarm occurs if the +5V-B supply from the PS distribution PWB (A2) is outside of its acceptable voltage range (between +4.5 and +5.5 V). The VS2.5 takes no action on this alarm. Check for +48V Supply Fail alarm: If present, follow the associated troubleshooting procedure. If not present, use a digital multimeter to measure between TP20 (+5V-B) and TP28 (ground) of the PS distribution PWB. If the measured value is not within the acceptable range, the power supply circuitry on the PS distribution PWB has failed. If the measured value is within the acceptable range, check ribbon cable W2 for damage and that W2P1 and W2P2 are properly seated in A1J12 and A2J7 respectively. If there are no visible problems with the ribbon cable,suspect the sampling circuitry on the PS distribution PWB. Replace the PS distribution PWB (see “PS Distribution PWB Replacement” on page 1-43). If the alarm persists after replacing the PS distribution PWB, suspect the exciter/control PWB (A1).

All Power Amplifiers Inactive(All PAs Inactive)

PA (red) This alarm indicates that all of the PAs in the system or all of the power supply modules in the system have failed simultaneously; therefore PA failure alarms or power supply module related alarms should also be present. If there are power supply module related alarms present, or an IPA Output Low alarm, follow the associated troubleshooting procedure. If there are no power supply module related alarms, with RF turned on, use a digital multimeter to measure the voltage between pad V and pad W on any PA. If the voltage does not fall within an acceptable range (between 2.3 V and 3 V), suspect the exciter/control PWB (A1). If the voltage does fall in the acceptable range, perform the “PA resistance checks” on page 1-30. If there is no problem found with any of the PAs, or the alarm still persists after replacing all of the damaged PAs, suspect the PS distribution PWB (A2).

Analog Audio Left Low(Anlg Left Aud Low)

Exciter (amber) This alarm indicates the analog left audio input level is too low or is not applied. The VS2.5 takes no action on this alarm.

Analog Audio Right Low(Anlg Right Aud Low)

Exciter (amber) This alarm indicates the analog right audio input level is too low or is not applied. The VS2.5 takes no action on this alarm.




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ARM Network Down

Exciter (amber) This alarm indicates that the microcontroller that runs the remote interfacing applications (ARM) is unable to aquire an IP address. When this alarm is present, it will not be possible to access any of the remote functionality. Check that the Ethernet cable is properly connected to A1J8A on the rear of the transmitter. If the alarm is still present see “Network setup” on page 2-64 of the Operations and Maintenance Manuals for information on setting up the network connection.

ARM Not Booted

Exciter (amber) This alarm indicates that the microcontroller that runs the remote interfacing applications (ARM) is not yet running. This alarm should only be present when the transmitter is first turned on or after the transmitter's ac power has been cycled.

ARM Not Responding

Exciter (amber) This alarm indicates that the microcontroller that runs the remote interfacing applications (ARM) is not communicating with the transmitter’s primary microcontroller (DSP). If the watchdog function is enabled, the DSP will automatically reset the ARM. If this alarm persists for more than 10 minutes, try cycling power (off, then on) to the transmitter. If the alarm persists, replace the exciter/control PWB (A1) if necessary (see “Exciter/Control PWB Replacement” on page 1-40).

Audio Loss Exciter (red) This alarm, enabled by the user, indicates that the exciter’s audio modulation level is below the level specified in the dead air settings of the active preset (see “Audio Loss” on page 2-54 of the Operations and Maintenance Manuals to enable/disable this alarm and to configure the resulting action). Depending on the setting, this alarm could trigger a preset change, inhibit RF or have no effect (alarm only). Check the appropriate program input(s) and the dead air setting for the preset.

Audio Shutdown

Exciter (red) This alarm occurs if the exciter’s audio processing and FM modulation code is shut down. Should display only during a software upgrade.

Composite Audio Low(MPX Aud Low)

Exciter (amber) This alarm indicates the composite audio input level is too low. The VS2.5 takes no action on this alarm.




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CPLD Version Mismatch(CPLD Ver Mismatch)

Exciter (red) This alarm indicates that the CPLD version installed on the transmitter does not match the version expected to be seen by the version of code installed on the DSP. The VS2.5 will not be able to turn RF on. Contact Nautel for further assistance.

Cutback Active Output Network (amber)

This alarm occurs whenever the transmitter experiences a cutback. A cutback (reduction in power) occurs when repeated shutback alarms occur within a prescribed time period. Shutbacks occur when the transmitter's peak reflected power exceeds 2:1 due to a transient SWR condition (arc or lightning) within the output transmission line or antenna system. The transmitter shuts back and recovers to a series of cutback levels (depending on the severity of the alarm), with each level being a 1/8th reduction in power from the previous cutback level, starting from the preset setpoint. Inspect the output transmission line for punctures or damage. After repairing damage, or if no damage is found, attempt to reset the latched condition [using the remote AUI’s Reset button (see “Reset:” on page 2-14 of the Operations and Maintenance Manual) or using the local front panel display (see “Resetting alarms” on page 2-57 of the Operations and Maintenance Manual)]. If no damage can be found, suspect a fault with the combiner interface PWB (A12) (see “Combiner Interface PWB Replacement” on page 1-45).

Digital Audio Low(Digital 1 Aud Low)

Exciter (amber) This alarm indicates the corresponding digital input level is too low and is typically accompanied by a SRC1 Unlock alarm (see its description and troubleshooting action). If no accompanying SRC alarm exists, suspect a problem with the external audio processor or studio feed. The VS2.5 takes no action on this alarm.

Discharging PA Volts(Discharging PA V)

PS (red) This alarm occurs when the transmitter has initiated a shutback sequence, and residual PA voltage energy stored in the capacitors in the power supplies and PAs is being discharged. During a shutback sequence, the RF drive to the PAs is turned off immediately after the event, and this occurs faster than the power supply modules can be inhibited. Therefore, PA voltage is still being applied to the capacitors with no drive to discharge the energy. To discharge the stored energy from the capacitors, the PA bias is increased to a discharge level after the power supplies have been inhibited. This causes the stored energy to be dissipated through dc current in the FET. This alarm should only occur with a Residual PA Volts Present alarm. See Residual PA Volts Present alarm for more information.




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Entered Firmware Upgrade(Exc Firmware Upgr)

Exciter (red) This alarm occurs when the exciter is in “firmware upgrade” mode. It should only be displayed during a transmitter software upgrade.

External Interlock Open(External Interlock)

Exciter (red) This alarm occurs when the external interlock input wired to the exciter/control PWB (A1) is open. The VS2.5 will not be able to enable its RF output. Check the interlock connection between A1J2A-19 and A1J2A-20 on the rear of the transmitter. If the interlock connection is intact, check that all external interlock switches are closed. If no problem is found with the connection at the transmitter or any of the external interlock switches, suspect a problem with the interlock circuitry on the exciter/control PWB (A1).

Fan 1 - 7 Fail Output Network (amber)

This alarm occurs if the speed of one of the transmitter's cooling fans is below 3000 RPM (half of its nominal value of 6000 RPM). If any of fans 3 through 7 fail, the VS2.5 will reduce its maximum power setting based on the number of fan failures that have occurred (see Table 1.2 on page 1-26). If either fan 1 or 2 fail, the VS2.5 takes no action (no effect on the RF output). If the alarm occurs for fans 1 or 2, check the connection between the indicated fan and the PS distribution PWB (A2). If the alarm occurs for fans 3, 4, 5, 6 or 7, check the connection between the indicated fan and the splitter PWB (A4). If these connections look OK, replace the indicated fan (see “Cooling fan replacement - fans 3 (B3) through 7 (B7)” on page 1-36). If the alarm still occurs after the fan has been replaced, suspect the PS distribution PWB for fans 1 or 2 and suspect the exciter/control PWB (A1) for fans 3 through 7.

Forward Power Limiting(Fwd Power Limiting)

Output Network (amber)

When the High Forward Power alarm is active, the Forward Power Limiting alarm occurs if its associated threshold is exceeded (1.063 times the maximum power setting; 2976 W). The transmitter will fold back the forward power each time the threshold is exceeded. This alarm occurs only if the exciter ALC cannot respond fast enough to transmitter load changes. Inspect the antenna network attached to the transmitter. If there are no major issues with the antenna network that would cause an impedance change (icing for example) suspect the combiner interface PWB (A12) (see “Combiner Interface PWB Replacement” on page 1-45)“Output power probe PWB replacement” on page 1-37.




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Forward Power Low(Fwd Power Low)


This alarm occurs if the transmitter's average forward power falls below the low forward power threshold (defaulted to 50% of the preset power level and is user adjustable) due to PA failures, fan failures, SWR foldback or a pre-amp/IPA failure. The VS2.5 takes no action on this alarm. Check for associated alarms, and follow the associated troubleshooting procedure if present. If no other alarms are being indicated, with RF turned on, use a digital multimeter to measure the voltage between pad V and pad W on any PA. If the voltage does not fall within an acceptable range (between 2.3 V and 3 V), suspect the exciter/control PWB (A1). If the voltage is within this range, suspect the combiner interface PWB (A12) (see “Combiner Interface PWB Replacement” on page 1-45).

Forward Power Shutdown(Fwd Power Shutdown)

Output Network (red)

This alarm occurs if the transmitter tries to reduce the forward power below minimum (64 W) due to repeated Forward Power Limiting alarms. The transmitter latches off. See Forward Power Limiting for troubleshooting tips.

Forward Power Very Low(Fwd Power Very Low)


This alarm occurs if the transmitter's average forward power falls below the very low forward power threshold (defaulted to 12.5% of the preset power level and is user adjustable) due to PA failures, fan failures, or SWR foldback. The VS2.5 takes no action on this alarm. See Forward Power Low for troubleshooting tips.

High Forward Power(High Fwd Power)


This alarm occurs if the transmitter's average forward power exceeds the high forward power threshold (1.036 times the maximum power setting; 2901 W). This alarm occurs only if the exciter ALC cannot respond fast enough to transmitter load changes. The VS2.5 takes no action on this alarm. Check for associated alarms and follow the associated troubleshooting procedure, if present. If no other alarms exist, inspect the antenna network attached to the transmitter. If there are no major issues with the antenna network that would cause an impedance change (icing for example) suspect the combiner interface PWB (A12) (see “Combiner Interface PWB Replacement” on page 1-45).

High Reject Output Network (amber)

This alarm occurs if the control system determines that the calculated power in any reject resistor exceeds the high reject power threshold (320 W). The VS2.5 takes no action on this alarm. Check for associated alarms, and follow the associated troubleshooting procedure if present. Typically, high reject power is the result of a PA failure or removal. If no other alarms are being indicated, contact Nautel for further support.




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High SWR Output Network (amber)

This alarm occurs if the transmitter's average reflected power exceeds the high SWR threshold (72 W). The VS2.5 takes no action on this alarm. Inspect the antenna and transmission line system for damage or de-tuning. If there are no major issues with the antenna network that would cause an impedance change (icing for example), suspect the combiner interface PWB (A12) (see “Combiner Interface PWB Replacement” on page 1-45).

High SWR Shutdown


This alarm occurs if the transmitter tries to reduce the forward power below a level that is equivalent to a 3:1 VSWR (forward power of 412 W) at the SWR Foldback threshold (reflected power of 103 W) due to a gradually degrading load match. This alarm causes the transmitter to latch off. Inspect the antenna and transmission line system for damage or de-tuning. If there are no major issues with the antenna network that would cause an impedance change (icing for example), suspect the combiner interface PWB (A12) (see “Combiner Interface PWB Replacement” on page 1-45).

Insufficient Fans Active(Insuf. Fans Active)


This alarm indicates that the fans in the transmitter’s RF power stage are not running. This alarm causes the transmitter to shut down, and clears when the system detects a running fan in the RF power stage. See Fan Fail alarm for troubleshooting information.

IPA Fail PA (red) This alarm occurs if the IPA Output Low alarm is present and the measured IPA current is below 225 mA. The VS2.5 takes no action on this alarm. See IPA Output Low for troubleshooting tips.

IPA Output High

PA (red) This alarm occurs if the pre-amp/IPA PWB's (A5) forward power is greater than the IPA Output High threshold (36 W). If this condition persists, replace the pre-amp/IPA PWB (A5) (see “Pre-amp/IPA PWB replacement” on page 1-31). The VS2.5 takes no action on this alarm. If this alarm persists after replacing the pre-amp/IPA PWB, suspect the combiner interface PWB (A12) (see “Combiner Interface PWB Replacement” on page 1-45) or the exciter/control PWB (A1) (see “Exciter/Control PWB Replacement” on page 1-40).




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IPA Output Low

PA (red) This alarm occurs if the pre-amp/IPA PWB's (A5) forward power is less than the IPA Output Low threshold (14.4 W). This alarm causes the controller to limit the PA voltage to 30 V. Check for a +48V Supply Fail alarm and follow the associated troubleshooting procedure if present. IPA Fail and Pre-amp Fail alarms may also be present. If no associated alarms are present, turn RF off and run the bias routine in the front panel’s Main Menu -> System Settings -> Calibration menu. If the alarm persists, enable RF and use a digital multimeter to measure the voltage between pad B on pre-amp/IPA PWB (pre-amp bias) and chassis (ground) and also between pad C on pre-amp/IPA PWB (IPA bias) and chassis (ground). If the voltage is less than 1 V at either of these points, suspect the exciter/control PWB (A1). If the voltage is greater than 1 V at both of these points, use a digital multimeter to measure between pad E (IPA volts) on the pre-amp IPA PWB and chassis (ground). If the measured voltage is not within and aceptable range (between +43 V and +48 V), with ac power off, perform a continuity check across F1 of the PS distribution PWB (A2). If the measurement is greater than 1 Ω, replace the fuse (Nautel Part # FA57 in the ancillary kit). If the measurement is less than 1 Ω, or replacing the fuse does not clear the alarm, replace the pre-amp/IPA PWB (A5) (see “Pre-amp/IPA PWB replacement” on page 1-31). If the voltage on pad E is acceptable, use a digital multimeter to measure between pad D (pre-amp volts) on the pre-amp IPA PWB and chassis (ground). If the measured voltage is not within and aceptable range (between +43 V and +48 V), replace the pre-amp/IPA PWB (A5) (see “Pre-amp/IPA PWB replacement” on page 1-31). If the voltage is acceptable, or replacing the pre-amp/IPA PWB PWB does not clear the alarm condition, suspect the combiner interface PWB (A12) (see “Combiner Interface PWB Replacement” on page 1-45) or the exciter/control PWB (A1) (see “Exciter/Control PWB Replacement” on page 1-40).

Low Backup Battery

Exciter (amber) This alarm occurs if the backup battery voltage falls below an acceptable level (2.7 V). The VS2.5 takes no action on this alarm. Use a digital multimeter to measure the battery voltage (with ac power on). If the battery voltage is low, replace the battery. If battery voltage is OK, cycle ac power (off, then on). If the alarm does not clear, suspect the exciter/control PWB (A1).




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Missing Preset(Exc Missing Preset)

Exciter (red) This alarm indicates that there are no presets programmed into the transmitter. In this state, the transmitter’s front panel UI will default to the first time startup screen (see Figure 8.1 on page 8-2 of the Installation Manual) and the user will not be able to enable RF without first programming a preset.

Need Reboot for Settings(Exc Need Reboot)

Exciter (red) This alarm indicates that exciter setup changes have been made, typically via the Hardware Configuration page of the AUI. Typically, the DSP will reboot itself automatically; however, if this alarm persists for more than five minutes, cycle the transmitter’s ac power (off, then on) to store the changes.

No 1 PPS Exciter (amber) This alarm occurs if the pilot phase locking to 1 PPS is enabled and the 1 PPS signal is not present. Check the 1 PPS input. If there are no problems with the 1 PPS signal and connection, suspect the exciter/control PWB (A1).The VS2.5 takes no action on this alarm.

No External 10 MHz(Exc No Ext 10MHz)

Exciter (amber) This alarm occurs if frequency locking to an external 10 MHz souce is enabled and no external 10 MHz is detected. The exciter will automatically switch over to the internal 10 MHz reference, and will continue to run. Check the 10 MHz input. If there are no problems with the 10 MHz signal and connection, suspect the exciter/control PWB (A1).

No Internal 10 MHz

Exciter (red) This alarm occurs if no 10 MHz clock is being detected on the exciter/control PWB (A1). This alarm will cause the transmitter to shut-down and the exciter/controller PWB may not be running. Replace the exciter/control PWB (see “Exciter/Control PWB Replacement” on page 1-40).




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PA 1 - 4 Fail PA (amber) This alarm occurs if the dc input current for the indicated PA has fallen below a predetermined threshold (typically less than 50% of the average PA current of the operational PAs, or below 500 mA, whichever is lower). This may be caused by a cabling fault on the PA, loss of PA voltage or bias, or a defective FET. The transmitter's output power will be reduced (see Table 1.2 on page 1-26) and this condition could cause Per PA Foldback and Reject Foldback alarms. Check for an All Power Amplifiers Inactive alarm and follow the associated troubleshooting procedure if present. If the All Power Amplifiers Inactive alarm is not present, perform the “PA resistance checks” on page 1-30. If there is no problem found with the PAs, or the alarm still persists after replacing the PA, suspect the PS distribution PWB (A2).

PA Over Temperature(PA Over Temp)

PA (red) This alarm occurs when the temperature as measured by RT1 or RT2 exceeds 85°C (185°F). This alarm will cause the transmitter to shut down and latch off. Check for Fan Fail alarms and follow the associated troubleshooting procedure if present. If no Fan Fail alarms are present, check the transmitter's air filter and clean or replace as required (see Section 3, “Routine maintenance of the Operations and Maintenance Manual). If the alarm persists, suspect the exciter/control PWB (A1).

PA Pwr Foldback


This alarm occurs if the control system determines that the calculated dissipation in any FET on a PA is above the high dissipation threshold (300 W), or the forward power being asked for out of an individual PA [calculated as (output power - combiner losses) / number of active PAs in the system] is above the PA output high threshold (850 W). The forward power of the transmitter will be limited to a level such that neither of these thresholds are exceeded. Check for associated alarms. Typically, the assertion of this alarm is the result of a PA failure or removal, or a high SWR condition. If no other alarms are being indicated, contact Nautel for further support.

PA Volts Fail PS (amber) This alarm is for indication only, and occurs when the voltage output by the power supply module does not match what the controller thinks it should be based on the control signal it is sending to the power supply module. No action is taken on this alarm. This alarm may show up when turning RF on or off.




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Pilot Unsync Exciter (amber) This alarm occurs if there is no synchronization between the 10 MHz and 1PPS signals. It may indicate that the GPS receiver is not detecting a signal. Check the GPS receiver and antenna.The VS2.5 takes no action on this alarm.

PLL Unlock Exciter (red) This alarm indicates that the exciter’s master clock is not locked. Possible causes are an out-of-range 10 MHz input or a hardware failure on the exciter/control PWB (A1). The VS2.5’s RF output is inhibited.

Preamp Fail PA (red) This alarm occurs if the IPA Output Low alarm is present and the measured pre-amp current is below 17.5 mA. The VS2.5 takes no action on this alarm. See IPA Output Low for troubleshooting tips.Pre-amp/IPA PWB replacement - see page 1-31

PS A (or B or C) AC Fail

PS (amber) This alarm occurs if power supply module A (U1), B (U2) or C (U3) is reporting an ac failure, indicating its ac input voltage is less than 175 V ac. The VS2.5 will reduce its maximum power setting based on the number of power supply module failures that have occurred (see Table 1.2 on page 1-26). Check the ac voltage applied to the power supply module. If the ac voltage is acceptable, try replacing the indicated power supply module with a new module, or changing the position of the indicated power supply within the transmitter (see “Power Supply Module Replacement” on page 1-34). If the fault moves with the power supply module, replace the power supply module. If the fault does not move with the power supply module, or if replacing it with a new power supply module does not clear the fault, suspect the PS distribution PWB (A2).

PS A (or B or C) Fail

PS (amber) This alarm occurs if power supply module A (U1), B (U2) or C (U3) is reporting a PS failure, indicating its output voltage is outside of its acceptable range. The VS2.5 will reduce its maximum power setting based on the number of power supply module failures that have occurred (see Table 1.2 on page 1-26). Try replacing the indicated power supply module with a new module, or changing the position of the indicated power supply within the transmitter (see “Power Supply Module Replacement” on page 1-34). If the fault moves with the power supply module, replace the power supply module. If the fault does not move with the power supply module, or if replacing it with a new power supply module does not clear the fault, suspect the PS distribution PWB (A2) or the exciter/control PWB (A1).




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PS A (or B or C) Missing

PS (amber) This alarm occurs if power supply module A (U1), B (U2) or C (U3) is not being detected or has been removed. The VS2.5 will reduce its maximum power setting based on the number of power supply module failures that have occurred (see Table 1.2 on page 1-26). If there is a power supply module in the position being indicated by the alarm, try replacing the indicated power supply module with a new module, or changing the position of the indicated power supply within the transmitter (see “Power Supply Module Replacement” on page 1-34). If the fault moves with the power supply module, replace the power supply module. If the fault does not move with the power supply module, or if replacing it with a new power supply module does not clear the fault, suspect the PS distribution PWB (A2).

PS A (or B or C) Over Temperature(PS A Over Temp)

PS (amber) This alarm occurs if power supply module A (U1), B (U2) or C (U3) is reporting a high temperature alarm, indicating its operating temperature has exceeded its internal threshold. The VS2.5 will reduce its maximum power setting based on the number of power supply module failures that have occurred (see Table 1.2 on page 1-26). This alarm is most likely caused by a module fan failure or blockage. Allow the module to cool and attempt to reset the alarm. Verify the module turns on and its fan is operational. If the fan is not operational, inspect it for possible blockage. If a problem is found, replace the power supply module (see “Power Supply Module Replacement” on page 1-34). If there is no problem found, inspect the transmitter’s air filter and clean or replace as required (see Section 3, “Routine maintenance of the Operations and Maintenance Manual). If the alarm persists, try replacing the indicated power supply module with a new module, or changing the position of the indicated power supply within the transmitter (see “Power Supply Module Replacement” on page 1-34). If the fault moves with the power supply module, replace the power supply module. If the fault does not move with the power supply module, or if replacing it with a new power supply module does not clear the fault, suspect the PS distribution PWB (A2).




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PS Current Foldback(PS Curr Foldback)

PS (amber) This alarm occurs if the control system determines that the calculated current output by any power supply module [calculated as (total current being supplied to PAs/number of power supply modules in system)] is above the high current threshold (45 A with two power supply modules removed and 40 A with two or three power supply modules present). The forward power of the transmitter will be limited to a level such that this threshold is not exceeded. Check for associated alarms, and follow the associated troubleshooting procedure if present. Typically, the assertion of this alarm is the result of a high SWR condition. If no other alarms are being indicated, suspect the PS distribution PWB (A2).

Reject Foldback


This alarm occurs if the control system determines that the calculated power in any reject resistor exceeds the reject power foldback threshold (400 W). The forward power of the transmitter will be limited to a level such that this threshold is not exceeded. This alarm should be accompanied by a High Reject alarm. Check for other associated alarms, and follow the associated troubleshooting procedure if present. Typically, high reject power is the result of a PA failure or removal. If no other alarms are being indicated, contact Nautel for further support.

Reject Shutback


This alarm occurs if the control system determines that the calculated power in any reject resistor exceeds the reject power shutback threshold (480 W). This alarm will initiate an immediate shutdown of the transmitter's RF output. The transmitter will then attempt to turn RF on and increase the forward power of the transmitter to a level such that the reject foldback threshold is not exceeded. This alarm should be accompanied by a High Reject alarm and possibly a Reject Foldback alarm. Check for other associated alarms, and follow the associated troubleshooting procedure if present. Typically, a reject shutback is the result of a sudden PA failure. If no other alarms are being indicated, contact Nautel for further support.

Residual PA Volts Present(Residual PA V Pres)

PS (red) This alarm indicates that after the transmitter has turned off its RF output, it is unable to discharge the PA volts to a level that is below 3 V. This condition will not allow the transmitter to turn on its RF output; however the condition will be cleared once the PA volts reaches a level that is below 3 V. This condition will typically occur with a failed PA or power supply module. Check for associated alarms and follow the associated troubleshooting procedure, as applicable. If no associated alarms are present, suspect the PS distribution PWB (A2) or the exciter/control PWB (A1).




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Running Bias Routine

- This is an informational alarm only that is displayed when the bias routine has been initiated.

Rebooted Exciter

Exciter (red) This is an informational alarm only that is displayed when the watchdog timer reboots the transmitter’s main microcontroller (DSP). Typically, this alarm will show up after an ac power interruption.

SCA1 Audio Low(SCA1 Aud Low)

Exciter (amber) This alarm indicates the SCA 1 input level is too low or is not applied. The VS2.5 takes no action on this alarm.

SCA2 Audio Low(SCA2 Aud Low)

Exciter (amber) This alarm indicates the SCA 2 input level is too low or is not applied. The VS2.5 takes no action on this alarm.

SRC1 Unlock Exciter (amber) This alarm indicates that no valid AES/EBU stream data is being detected on the selected AES/EBU. The VS2.5 takes no action on this alarm.

SWR Foldback Output Network (amber)

This alarm occurs if the transmitter's average reflected power exceeds the SWR foldback threshold (103 W) due to a gradually degrading load match. The forward power of the transmitter will be limited to a level such that this threshold is not exceeded. If the load match improves while the transmitter is producing RF output, the forward power will increase. If the transmitter folds back to a forward power that is equivalent to a 3:1 VSWR at the SWR Foldback threshold (forward power of 412 W), an SWR Shutdown alarm occurs. Inspect the antenna and transmission line system for damage or de-tuning. If there are no major issues with the antenna network that would cause an impedance change (icing for example), suspect the combiner interface PWB (A12) (see “Combiner Interface PWB Replacement” on page 1-45).




Page 1-24 Issue 0.2 2010-12-17

SWR Shutback Output Network (red)

This alarm occurs if the transmitter's reflected power suddenly exceeds the SWR shutback threshold, which is the reflected power that is equivalent to a 2:1 VSWR at max power (311 W) due to a transient SWR condition (arc or lightning) within the output transmission line or antenna system. Attempt to reset the latched condition by pressing Reset [using the remote AUI’s Reset button (see “Reset:” on page 2-14 of the Operations and Maintenance Manual) or using the local front panel display (see “Resetting alarms” on page 2-57 of the Operations and Maintenance Manual)]. Inspect the output transmission line for punctures or damage. If no damage can be found, suspect the combiner interface PWB (A12) (see “Combiner Interface PWB Replacement” on page 1-45). See also Cutback Active alarm.

Transmitter RF Off

- This alarm occurs if the transmitter is in an RF off state.

Unsigned DSP Image(Exc Bad DSP Image)

Exciter (red) This alarm indicates that the exciter is operating with ‘unsigned code’, but is otherwise operational. This alarm may only be displayed if the transmitter is operating with a ‘beta’ version of factory software.




Issue 0.2 2010-12-17 Page 1-25

Troubleshooting tips

AUI lockup

If the remotely accessed AUI screen stops responding, and subsequent attempts to re-access the AUI are unsuccessful, verify that all network settings are correct (see Network Setup in the Operations and Maintenance Manual). If all network settings are correct and the AUI continues to be inaccessible, perform the ARM Reset procedure in the Operations and Maintenance Manual. If the AUI is still inaccessible, try cycling (turn off, then on) the ac power. If the problem persists, contact Nautel for further assistance.


Page 1-26 Issue 0.2 2010-12-17

Operating with defective PAs or cooling fans

It is permissible to operate the transmitter with multiple defective power amplifier PWBs or cooling fans. Table 1.2 shows the approximate remaining output power when power amplifiers (PAs) or cooling fans fail.

Table 1.2: Output Power Level vs. PA or Fan Failure

NOTE: There are several combinations of PA, PS module or fan failures that can affect the RF output. Table 1.2 shows the maximum RF output power that can be expected for a given condition. In the event that PA, PS and fan failures occur simultaneously, the maximum RF output power is limited to the lowest maximum power of each individual condition.

CAUTION: Defective PAs must remain installed in order for the transmitter to continue operating. Operation with removed PAs may result in an unstable RF output and possible damage to transmitter circuitry.

PA PWB or Fan Failures Maximum RF Output Power(W)

1 PA fan (B3 - B7) 2500 (full power)

2 PA fans (B3 - B7) 1250 (half power)

3 PA fans (B3 - B7) 64 (minimum power)

4 PA fans (B3 - B7) 64 (minimum power)

5 PA fans (B3 - B7)0 (RF output is inhibited until

at least 1 fan is replaced)

1 PA PWB (A6 - A9) 1780

2 PA PWBs (A6 - A9) between 340 and 475, depending on PA positions

3 PA PWBs (A6 - A9) 110

1 PS module (U1, U2 or U3) 2500

2 PS modules (U1, U2 or U3) 800


Issue 0.2 2010-12-17 Page 1-27

Replacing a suspect PWB, power supply or fan

Maintenance philosophy

Maintenance on a VS2.5 transmitter consists of replacing any of the PWBs, power supplies or fans identified in Table 1.3 on page 1-28.

Special Tools and Test Equipment

The following tools and test equipment are required to troubleshoot a VS2.5 transmitter.

– Digital multimeter– Torque screwdriver, capable of torquing up to 2.2 N-m (20 in.-lbs). Required for

installing securing hardware for PA PWB FETs and power supply connections.– Soldering iron and desoldering tool– VS2.5 station spares kit, if purchased (contains replacement PA PWBs, pre-amp/IPA

PWBs and cooling fans)– Electrical schematics in Section 5 of this manual.– Mechanical drawings in Section 6 of this manual.

Electrostatic Precautions

The VS2.5 transmitter contains semiconductor devices that are susceptible to damage from electrostatic discharge. Be sure to follow the electrostatic precautions in “Electrostatic protection” on page 1-3 at all times.


Page 1-28 Issue 0.2 2010-12-17

Preparation for replacing a PWB or module

1. Disable the VS2.5’s RF output (RF off) and set its AC POWER switch to the off position. Disconnect all cabling from the rear of the VS2.5, remove the VS2.5 from its host cabinet and place the VS2.5 on a suitable work surface.

2. Based on the alarm that prompted troubleshooting, replace the appropriate PWB, module or cooling fan (see the appropriate replacement procedure in Table 1.3 on page 1-28).

Table 1.3: Replacement Procedures

NOTE: If a power amplifier (PA) failure occurs, you must replace the entire power amplifier PWB, rather than an individual FET. A spare PA PWB (NAPA31) is provided in the transmitter station spares kit, if purchased. To order a station spares kit contact Nautel. Failure to observe this recommendation may void your equipment warranty or cause further failures.

Module Replacement Procedure

PA PWB See page 1-29

Pre-amp/IPA PWB See page 1-31

Power Supply Module See page 1-34

+48 V Power Supply See page 1-35

Cooling Fan (B3 through B7) See page 1-36

Cooling Fan (B1 and B2) See page 1-38

Exciter/Control PWB See page 1-40

PS Distribution PWB See page 1-43

Combiner Interface PWB See page 1-45


Issue 0.2 2010-12-17 Page 1-29

PA PWB replacement

See Figure MD-2 in the Mechanical Drawings section (Section 6) of this manual.

1. Remove the transmitter’s bottom cover. Retain hardware for re-installation.

2. Before replacing a suspect PA PWB, verify the fault is with the suspect PA PWB by performing the continuity and resistance checks detailed in “PA resistance checks” on page 1-30. If you are prompted to replace a PA PWB, return to Step 3 of this procedure.

3. Unsolder and remove the five solder connections to the defective PA PWB. They include two 24 AWG links (to pads V and X), a white 12 AWG wire (to pad U) and a black 12 AWG wire (to pad T). If you are removing PA # 3 (A8), note that the black 12 AWG wire is secured, using a terminal lug, to the front, left screw that secures A8 to the heat sink.

4. Remove the two #4 screws, split and flat washers securing the FET to the heat sink.

5. Remove the four M3 screws securing the PA PWB to the heat sink. Remove the PA PWB from the heat sink. Ensure that the silverstrate pads that were below the FETs have been removed from the heat sink. If necessary, use a knife blade to carefully pry the pads from the heat sink surface.

6. Clean the heat sink surface with a soft cloth and non-abrasive grease remover. Do not use any material that may scratch the heat sink surface.

7. Obtain the replacement NAPA31 PA PWB from the station spares kit, if purchased.

8. Install a new silverstrate pad (Nautel Part # HAK64, obtained from the station spares kit) between the FET (Q1) and the heatsink.

NOTE: FETs are static sensitive. Handle the PA PWB in a static protected manner.


Page 1-30 Issue 0.2 2010-12-17

9. Secure the PA PWB on the module's heat sink using the four screws removed in Step 5. Ensure correct orientation (same as the adjacent PWB). Do not tighten the four screws at this time.

10. Secure the FET (Q1) with two # 4 screws, a mini-flat washer and a new split washer. Using a torque screwdriver, alternate tightening the left and right screws on each FET, a quarter turn at a time, until 6 inch-pounds (0.67 Newton-meters) of torque has been applied.

11. Tighten the four PWB screws.

12. Solder the wires removed in Step 3. If necessary, refer to Table 4.3, “Wiring List - VS1 Transmitter” for wiring details for A6 through A9.

13. Re-install the transmitter’s bottom cover.

14. Re-install the transmitter in its host cabinet, reconnect all interconnect cables and restore operation by enabling ac and RF power.

PA resistance checks

1. Using a digital multimeter, check the continuity across fuse F1 on the suspect PA PWB.

– If the measurement is an open circuit, replace the PA PWB (see “PA PWB replacement” on page 1-29).

– If the measurement is short circuit (near 0 Ω), proceed to Step 2.

2. Using a digital multimeter, measure the resistance between each gate lead of the FET and the metal flange of the FET.

– If the measurement is less than 8 kΩ, replace the PA PWB (see “PA PWB replacement” on page 1-29).

– If the measurement is between 8 kΩ and 17.5 kΩ, check the other PA PWBs for a failure. If none of the other PA PWBs have failed, replace the original suspect PA PWB.

– If the measurement is greater than 17.5 kΩ, proceed to Step 3.

CAUTION: When installing FET securing hardware, you can damage the FET case if you fully tighten one screw while the other is loose. Avoid this by alternately tightening the two screws.


Issue 0.2 2010-12-17 Page 1-31

3. Using a digital multimeter, check the continuity between each drain lead of the FET (positive meter probe) and the metal flange of the FET (negative meter probe).

– If the measurement is open circuit, the PA PWB is OK and does not require replacement. Continue troubleshooting and suspect a problem with an associated PWB.

– If the measurement is not open circuit, replace the PA PWB (see “PA PWB replacement” on page 1-29).

Pre-amp/IPA PWB replacement

See Figure MD-2 in the Mechanical Drawings section (Section 6) of this manual.


2. Unsolder and remove the six solder connections to the pre-amp/IPA PWB (A5). They include two white, 16 AWG wires (to pads D and E), three 24 AWG tinned copper jumpers (to pads A, B and C) and two 20 AWG tinned copper jumpers (to pads F and H).

3. Remove the two #4 screws, Belleville and flat washers securing each of the clamps that secure FETs Q1 and Q2 to the heat sink.

4. Remove the four M3 screws securing the pre-amp/IPA PWB to the heat sink.

5. Remove the pre-amp/IPA PWB from the heat sink, noting the orientation.

6. Clean the heat sink surface with a soft cloth and non-abrasive grease remover. Do not use any material that may scratch the heat sink surface.

7. Obtain the replacement NAPA28A pre-amp/IPA PWB from the station spares kit, if purchased.

NOTE: FETs are static sensitive. Handle the pre-amp/IPA PWB in a static protected manner.


Page 1-32 Issue 0.2 2010-12-17

8. Secure the pre-amp/IPA PWB on the heat sink using the four screws removed in Step 5, noting the correct orientation. Do not apply thermal compound under FETs Q1 and Q2. Do not tighten the four screws at this time.

9. Install FET clamps (Nautel Part # 211-1215) on Q1 and Q2, ensuring they are parallel to the heat sink. Loosely secure the FETs (Q1 and Q2) with two #4 screws, a new Belleville washer (Nautel Part # HAJ59) and a flat washer (see Figure 1.4 on page 1-33). Turn screws until they barely put pressure on the clamp.

10. Using a torque screwdriver, alternate tightening the left and right screws on each FET clamp, a quarter turn at a time, until 5 inch-pounds (0.56 Newton-meters) of torque has been applied.

11. Tighten the four M3 PWB screws.

12. Solder the wires removed in Step 2. If necessary, refer to Section 4 of this manual for wiring details for A5.


14. Remove the transmitter’s top cover. Check the continuity across fuse F1 on the PS distribution PWB (A2). If the resistance is greater than 1 Ω, replace fuse F1 (Nautel Part # FA57, located in the ancillary kit) and re-install the transmitter’s top cover.

15. Re-install the transmitter in its host cabinet and reconnect all interconnect cables. Enable ac power.

16. Run the Bias Routine in the front panel UI’s System Settings -> Calibration menu.

17. Enable the transmitter’s RF output (RF on).

CAUTION: When installing FET securing hardware, you can damage the FET case if you fully tighten one screw while the other is loose. Avoid this by alternately tightening the two screws.


Issue 0.2 2010-12-17 Page 1-33

Figure 1.4: Pre-amp/IPA PWB mounting hardware

FET CLAMPS(211-1215)

FLAT WASHER

NEW BELLEVILLEWASHER(HAJ59)

SCREW


Page 1-34 Issue 0.2 2010-12-17

Power Supply Module Replacement

See Figure MD-1 (top view) in the Mechanical Drawings section (Section 6) of this manual.

1. Remove the transmitter’s top cover. Retain hardware for re-installation.

2. Remove the securing bracket from the front of the power supply module (U1, U2 and U3) by removing two M3 screws in the top of the bracket and two M4 countersunk screws in each side of the transmitter chassis. Note the orientation of the bracket for installation of the new power supply module. Retain hardware.

3. Slide the power supply module toward the front of the transmitter to disengage it from its mating connector.

4. Remove the power supply module from the transmitter.

5. Locate or obtain a replacement power supply module (Nautel Part # UG69A). Reverse Step 1 through Step 4 to reinstall the new power supply module.



Issue 0.2 2010-12-17 Page 1-35

+48 V Power Supply Replacement



2. Remove the two M3 screws and two countersunk M4 screws that secure the +48 V power supply (U4) (and its mounting bracket) to the transmitter. Retain hardware.

3. Remove the +48 V power supply from the transmitter and remove the mounting bracket for use with the new power supply. Note the orientation of each bracket for installation of the new power supply.

4. Disconnect wires # 10, 11, 12, 13 and 14 from the +48 V power supply’s terminal block, noting their destinations.

5. Locate or obtain a replacement +48 V power supply (Nautel Part # UG75). Install the two mounting brackets on the new power supply and reverse Step 1 through Step 4 to reinstall the new +48 V power supply. If necessary, refer to Section 4 of this manual for wiring details for U4. Torque all terminal connections on U4 to 11 inch pounds (1.2 Newton-meters).



Page 1-36 Issue 0.2 2010-12-17

Cooling fan replacement - fans 3 (B3) through 7 (B7)

See Figure MD-2 (bottom view) in the Mechanical Drawings section (Section 6) of this manual.


2. Disconnect the fan mating plugs (B3P1 through B7P1).

3. Slide the cooling fan bracket assembly out of the transmitter chassis (see Figure 1.5 on page 1-37) .

4. Remove and retain all M3 screws and other hardware that secures the fans to the mounting brackets. Note the orientation of brackets and fans before disassembling.

5. Remove the clip-on ferrite (Nautel Part # LA52) from the fan that is being replaced.

6. Obtain a replacement fan (Nautel Part # ZAP42) from the station spares kit, if purchased, or a suitable equivalent (vendor part # is Sanyo Denki 9G0848G103).

7. Install the clip-on ferrite on the wiring for the new fan. Secure the ferrite using a tyrap (Nautel Part # HT29) on each side of the ferrite. See the other fans for reference.

8. Install the replacement fan, along with the other functional fans, on the mounting brackets using retained screws.

9. Re-install the cooling fan bracket assembly in the transmitter chassis. Keep the fan bracket level when installing in the transmitter. Failure to do so could cause the bracket the bind and break the plastic slides if excessive force is used.

10. Reconnect the fan mating plugs to the splitter PWB (A4). If necessary, refer to Table 4.4, “Connector Mating Information - VS1 Transmitter” for connector mating details for A4.



CAUTION: Do not replace a cooling fan while ac power is applied to the transmitter. Failure to observe this could result in damage to the fan’s associated tachometer circuitry.


Issue 0.2 2010-12-17 Page 1-37

Figure 1.5: Fan Bracket Removal

B3 B4 B5 B6 B7

B1 andbracket

B2 andbracket

Remove front panel air filter toallow removal of B1 or B2

in bracket assembly


Page 1-38 Issue 0.2 2010-12-17

Cooling fan replacement - fans 1 (B1) and 2 (B2)

See Figure MD-2 (bottom view) in the Mechanical Drawings section (Section 6) of this manual.


2. Disconnect the associated fan mating plug (B1P1 or B2P1).

3. Remove the front panel air filter to gain access to fan bracket securing hardware (see “Replacing a damaged air filter” on page 3-2 of the Operations and Maintenance Manual for instructions on removing and re-installing the air filter).

4. Remove three countersunk M4 screws securing the fan bracket to the transmitter chassis (see Figure 1.5 on page 1-37), noting there is one in the front and two on the sides. Remove the bracket, with fan, noting proper orientation for re-assembly. Retain hardware.

5. Remove and retain all M3 screws and other hardware that secures the fan to the mounting bracket. Note the orientation of the bracket and fan before disassembling.

6. Remove the clip-on ferrite (Nautel Part # LA52) from the fan that is being replaced.

7. Obtain a replacement fan (Nautel Part # ZAP42) from the station spares kit, if purchased, or a suitable equivalent (vendor part # is Sanyo Denki 9G0848G103).

8. Install the clip-on ferrite on the wiring for the new fan. Secure the ferrite using a tyrap (Nautel Part # HT29) on each side of the ferrite. See the other fans for reference.

9. Install the replacement fan on the mounting bracket using retained screws.

10. Re-install the cooling fan bracket assembly in the transmitter chassis using retained screws.

11. Reconnect the fan mating plug to its associated mate (B1P1 to J5, B1P2 to J6). If necessary, refer to Section 4 of this manual for connector mating details.

12. Re-install front panel air filter.

CAUTION: Do not replace a cooling fan while ac power is applied to the transmitter. Failure to observe this could result in damage to the fan’s associated tachometer circuitry.


Issue 0.2 2010-12-17 Page 1-39

13. Re-install the transmitter’s top cover.



Page 1-40 Issue 0.2 2010-12-17

Exciter/Control PWB Replacement



2. Disconnect all mating plugs from the exciter/control PWB (A1), both inside the transmitter and at the rear of the transmitter.

3. At the rear panel, remove any securing hardware for connectors that protrude through the rear panel. Retain all hardware for re-installation.

• Locate the two DB-25 connectors (J2A and J2B) and the two DB-9 connectors (J5A and J5B) on the rear panel. Using a 5 mm nut driver or socket, remove the mounting nuts.

• Locate the AES/EBU XLR audio connector (J3) on the rear panel. Remove the two small pan-head Phillips screws.

• Remove the silver push button connector lock ("push" lever) on the XLR connector. Locate the HAS78 removal tool from the ancillary kit, provided with the transmitter. Follow the manufacturer's instructions in Figure 1.6 on page 1-41 to remove the push button. You will need access to the front and rear of the receptacle to remove it.

4. See Figure 1.7 on page 1-41. Remove the locking rings from five BNC connectors (J4A, J4B, J6A, J6B and J7). To remove the locking rings, use small 4 - 6 inch slip-jaw pliers. Gently loosen (do not tightly pinch or deform) each locking ring. Typically, half a turn with the pliers will loosen a locking ring enough to remove it by hand. Remove and retain the locking rings.

5. Remove the three small Phillips screws, which mount the front of the exciter/control PWB to the chassis, located along the edge of the exciter/control PWB. Retain hardware for re-installation.

6. Cut tyraps securing ferrite L8. Remove the two metal clips that hold L8 together and remove the half of L8 that is closest to the exciter/control PWB.

NOTE: The exciter/control PWB is static sensitive and must be handled in a static protected manner.


Issue 0.2 2010-12-17 Page 1-41

Figure 1.6: Removing the XLR connector’s “push” lever

Figure 1.7: Loosening the BNC connector’s locking ring


Page 1-42 Issue 0.2 2010-12-17

7. Slightly lift the front edge of the exciter/control PWB and withdraw towards the front of the transmitter.

8. Locate or obtain a replacement exciter/control PWB (Nautel Part # NAPE83). Remove the "push" lever from the XLR connector as detailed in Step 3.

9. Install the replacement exciter/control PWB. Replace all hardware for the through-chassis connectors. Take care not to over-tighten the BNC connector locking rings.

10. Install the three Philips screws that mount the front of the exciter/control PWB to the chassis.

11. Re-assemble ferrite L8 by re-installing the ferrite half removed in Step 6 and sliding the metal securing clip on each side. Secure L8 together with a tyrap around its clips and mounting bracket.

12. Install the "push" lever into the XLR connector. Align it with the slot located on the top section of the connector body and gently press it into position.

13. Reconnect all internal and external cables to the exciter/control PWB. If necessary, refer to Section 4 of this manual for connector mating details for A1.

14. Remove the "Interlock" jumper, if applicable, from J2A of the original exciter/control PWB and reinstall it on the new exciter/control PWB between J2A pins 19 and 20.

15. Reinstall the transmitter’s top cover.

16. Re-install the transmitter in its host cabinet, reconnect all interconnect cables and restore operation by enabling ac and RF power. The new exciter/control PWB is shipped with all standard or default power presets and audio settings. Check and restore them to your specific site requirements

CAUTION: When re-installing the exciter/control PWB, lift the PWB high enough so that mounting pillars do not damage parts on the underside of the PWB.


Issue 0.2 2010-12-17 Page 1-43

PS Distribution PWB Replacement



2. Temporarily remove the power supply modules (U1, U2 and U3) from the transmitter (see “Power Supply Module Replacement” on page 1-34).

3. Remove the exciter/control PWB (A1) (see “Exciter/Control PWB Replacement” on page 1-40).

4. Remove the five screws that secure the exciter deck [see Figure MD-1 in the Mechanical Drawings section (Section 6) of this manual] and pull the deck up and forward. Pop out all tyrap anchors, noting their location and orientation for re-assembly. Make sure the exciter wiring and associated items are clear of the PS distribution PWB.

5. Disconnect ribbon cable plugs W2P2 and W4P2 and MTA connectors P7 and P8 from the PS distribution PWB (A2). Remove the 17 wires (#7 through 14 and 25 through 33) connected to terminal blocks TB1 through TB4.

6. Remove the two screws that secure each cover to connectors A2J1, A2J2 and A2J3. Retain the covers and screws.

7. Use a 5.5 mm nut driver to remove the 12 M3 nuts, split and flat washers that secure the PS distribution PWB to the transmitter. Retain hardware.

8. Remove the PS distribution PWB from the transmitter.

9. Locate or obtain a replacement PS distribution PWB (Nautel Part # NAPS43). Reverse Step 1 through Step 8 to reinstall the new PS distribution PWB. If necessary, refer to the Wiring Lists section (Section 4) for wiring and connector mating details for A2. Torque connections on TB2 to 6 inch pounds (0.67 Newton-meters). Torque connections on TB1, TB3 and TB4 to 20 inch pounds (2.24 Newton-meters).

10. Reinstall the transmitter’s top cover.

NOTE: The PS distribution PWB is static sensitive and must be handled in a static protected manner.


Page 1-44 Issue 0.2 2010-12-17



Issue 0.2 2010-12-17 Page 1-45

Combiner Interface PWB Replacement



2. Disconnect the four tinned copper wire jumpers that are connected to pads A, B, C and D.

3. Remove the four M3 screws that secure the combiner interface PWB to the transmitter chassis. Do not remove the two screws next to the pins of J1 (one on either side of J1). Retain hardware.

4. Remove the combiner interface PWB from the transmitter by pulling straight up (i.e., disconnecting from edge card connector). Note the orientation of the PWB for installing the replacement PWB.

5. Locate or obtain a replacement combiner interface PWB (Nautel Part # NAPI139). Reverse Step 1 through Step 4 to reinstall the new combiner interface PWB. If necessary, refer to the Wiring Lists section (Section 4) for wiring details for A12.

6. Reinstall the transmitter’s bottom cover.



Page 1-46 Issue 0.2 2010-12-17

VS2.5 Troubleshooting Manual Detailed Circuit Descriptions

Issue 0.2 2010-12-17 Page 2-1

Section 2: Detailed Circuit Descriptions

Refer to the functional block diagram: “Block Diagram - VS300 Transmitter” on page 1-7 and high level descriptions of the VS2.5 Operation and Maintenance Manual.

This section provides a detailed description of the transmitter’s key modules and assemblies, including:

• Exciter/control PWB (NAPE83A) - see page 2-1

• PS distribution PWB (NAPS43) - see page 2-2

• Pre-amp/IPA PWB (NAPA28A) - see page 2-3

• Power amplifier PWB (NAPA31) - see page 2-4

VS2.5 electrical schematics

The descriptions in this section all refer to the VS2.5 electrical schematics listed in Table 5.1 on page 5-5 of the VS2.5 Troubleshooting Manual.

Exciter/control PWB (NAPE83A)

Detailed theory for the exciter/control PWB (A1) is not included in this manual.


Page 2-2 Issue 0.2 2010-12-17

PS distribution PWB (NAPS43)

See electrical schematic Figure SD-3.

Interfacing

The PS distribution PWB provides the interface between the VS2.5’s power supplies and the rest of the transmitter. It passes:

– ac voltage from the AC INPUT (U1) to the power supply modules (U1, U2 and U3).– PA voltage from the power supply modules (U1, U2 and U3) to the power amplifier

(PA) PWBs (A6 through A9).– Pre-amp voltage (+48 V) from the +48 V power supply (U4) to the pre-amp/IPA PWB

(A5) [pre-amp V delivered via the exciter/control PWB (A1) and the interface PWB (A3)].

– Power supply control voltage and power supply inhibit signal from the exciter/control PWB (A1) to the power supply modules (U1, U2 and U3).

Power supply monitoring

A 10-bit ADC IC U9 accepts several power supply related inputs (PA volts, PA current, pre-amp current, IPA current, +48 V, +15 V and +5 V) and converts them to a digital data stream on the MISO ADC output (J2-2). This output is applied to the exciter/control PWB for monitoring and protection purposes.

Power supply module fault monitoring

Two 8-bit shift register ICs, U4 and U5, accept the status and alarm signals from the the power supply modules (U1, U2 and U3) (PS present, PS ac fail, PS temp and PS fail) and converts them to a serial data stream on the MISO 165 output (J2-4). This output is applied to the exciter/control PWB for monitoring and protection purposes. If a power supply module fault occurs, the exciter/control PWB will inhibit the power supply module via the PS Inhibit input (J2-6).

Fan enable

Transistor Q3, FET Q2 and associated components form a fan enable circuit that controls the application of power supply voltage (+48 V) to the cooling fans in the RF power stage (B3 through B7). When the transmitter’s RF status is ‘on’, the Fan Enable input (J3-2) is logic high and transistor Q3 turns on. This causes FET Q2 to turn on, allowing +48 V to be applied to the Fan V (+) outputs (J3-11, 12 and 13), enabling fans B3 through B7. When the transmitter’s RF status is ‘off ’, transistor Q3 turns off. This causes FET Q2 to turn off, preventing +48 V from being applied to the Fan V (+) outputs; hence disabling the fans.


Issue 0.2 2010-12-17 Page 2-3

Fan monitoring

8-bit shift register IC U5 accepts the fan tach signals from fans B1 and B2 and converts them to a serial data stream on the MISO 165 output (J2-4). This output is applied to the exciter/control PWB for monitoring purposes.

Power supply combining

Resistors R3, R4, R53, R54, R70, R71, R86, R97 and R98 form a circuit that parallel combines the outputs of the three power supply modules (U1, U2 and U3) such that their output currents add together.

LVPS

Two +48 V to +5 V dc-dc converters (U16 and U17) and their associated components generate the +5 V rail that is applied to circuitry throughout the transmitter.

A +48 V to +15 V converter (U1) and its associated components generate the +15 V that is applied to the exciter/control PWB.

Pre-amp/IPA PWB (NAPA28A)


The pre-amp/IPA PWB (A5) accepts the RF output of the exciter/control PWB (A1), or external source, and amplifies it to an intermediate RF drive level for application to the PA PWBs (A6 through A9) via the splitter PWB (A4). The pre-amp/IPA PWB contains two N-channel FETs (Q1 and Q2) and associated components configured as a two-stage RF power amplifier. The RF output is generated by the Pre-amp V and IPA V levels provided by the PS distribution PWB (A2), and the Pre-amp Bias and IPA Bias outputs from the exciter/control PWB (A1). The RF output level is controlled by the RF input level generated by the exciter/control PWB. Cooling air for the pre-amp PWB is provided by fan B1.

The RF Drive input is applied to the gate of FET Q1 through a series of micro-strip transmission line sections and capacitors C1 and C2 and inductor L1, which provide impedance matching to transform the 50 ohm input to low impedance for application to Q1. Additional micro-strip transmission line sections at the output of Q1, as well as inductors L8 and L9 and capacitors C16 and C17, impedance match the Q1 output signal to 50 ohms. The impedance matched output of Q1 is applied to the gate of FET Q2 through a series of micro-strip transmission line sections and associated components,


Page 2-4 Issue 0.2 2010-12-17

including capacitor C18 and inductor L10, which provide impedance matching to transform the 50 ohm input to low impedance for application to Q2. Additional micro-strip transmission line sections at the output of Q2, as well as inductors L16 and L17 and capacitors C25 through C27, impedance match the RF Output signal to 50 ohms. .

The Pre-amp V input is applied to capacitors C29, C10, C11 and C12, which act as a broadband decoupling network. Capacitor C15 and inductors L5 and L7 provide low-pass filtering of the RF signal back to the ac-dc power stage.

The IPA V input is applied to capacitors C19, C21, C22 and C24, which act as a broadband decoupling network. Capacitor C23 and inductors L14 and L15 provide low-pass filtering of the RF signal back to the ac-dc power stage.

The Pre-amp Bias input voltage is provided by the exciter/control PWB to establish a dc bias current for Q1.

The IPA Bias input voltage is provided by the exciter/control PWB to establish a dc bias current for Q2.

Power amplifier PWB (NAPA31)


Each power amplifier (PA) PWB (A6 through A9) accepts the RF output of the pre-amp/IPA PWB (A5), which has been split four ways by the splitter PWB (A4), and amplifies it to its RF output level. Each PA PWB is a push-pull, RF power amplifier that is capable of providing 850 W of RF power in the FM broadcast band (87.5 to 108.0 MHz). The RF output is controlled by the PA V level generated by the power supply modules, the PA Bias output from the exciter/control PWB (A1), and the RF drive level generated by the IPA PWB. Cooling air for the PA PWBs is provided by fans B3 through B7.

The RF Drive input is applied to transformer T3, which is connected as a balun to provide balanced, 180° out-of-phase, RF drive signals to the individual gates of dual N-channel power MOSFET (Q1). Inductors L1, L2 and L3, capacitor C18 and transformer T3 provide impedance matching, which transforms the 50 ohm input to low impedance for application to Q1. The PA voltage is applied to the individual drains of Q1 via transformer T2, which, along with capacitors C14 and C15, cable T1 and inductor L4, transforms the impedance at the RF output, ensuring an optimum (low) impedance is presented at Q1's output. Cable T1 converts the balanced RF signal to an unbalanced RF Output signal. Capacitors C7, C8, C10, C12, C16 and C19 are used as dc blocking capacitors.


Issue 0.2 2010-12-17 Page 2-5

The PA V input is applied to capacitors C1, C2, C3, C4, C5, C9, C11, C13, C17, C21 and C22, which act as a broadband decoupling network. Capacitor C20 and resistors R4 and R5 provide low-pass filtering of the RF signal back to the ac-dc power stage.

The PA Bias input voltage is provided by the exciter/control PWB to establish a dc bias current for Q1. The bias current depends on the operating mode. The PA Bias voltage is applied to a low-pass filter circuit, formed by resistor R3 and capacitor C6, and is then applied to a voltage divider formed by resistors R3 and R1. Diodes CR1 and CR2 prevent the bias voltage from dropping below -6 V and damaging the FET.


Page 2-6 Issue 0.2 2010-12-17

VS2.5 Troubleshooting Manual Parts Lists

Issue 0.2 2010-12-17 Page 3-1

Section 3: Parts Lists

Parts information

This section contains reference designation lists that provide descriptive and provisioning information for all electrical and mechanical parts that have an assigned reference designation and form a part of the subject equipment.

Family tree

Figure 3.1 depicts the family tree for the subject equipment. It is based on the descending order of the reference designation hierarchy and identifies all assemblies that have an assigned Nautel configuration control number.

How to locate information about a specific part

To locate the information for a specific part, the assigned reference designation for the part must be known. In addition, the Nautel nomenclature (e.g., NAPA31) assigned to the assembly containing the part or the full reference designation, including the reference designation of all higher assemblies, must be known.

When the nautel nomenclature is known:

• Refer to the family tree (Figure 3.1) and identify the block(s) associated with the Nautel nomenclature. At the bottom of the main family tree block, a reference is made to “See Part Number Index Tables”. Locate the part's reference designation in the identified reference designation list in this section, noting they are sorted alphanumerically.

When the reference designation is known:

• Refer to the family tree depicted in Figure 3.1 with the full reference designation.

• Follow the family tree branches to the block that represents the lowest level assembly assigned a Nautel configuration control number. Then locate the part number index table for that Nautel configuration control number.

• Locate the part's reference designation in the specified table.


Page 3-2 Issue 0.2 2010-12-17

Reference designation lists

Individual reference designation lists are provided for:

• assemblies that are assigned an alpha-prefixed Nautel nomenclature (e.g., NAPA31)

• cable harnesses that are assigned a numbered Nautel part (e.g., 211-8204)

• optional kits that are assigned a numbered Nautel part

To obtain the full reference designation for a specific part the Nautel configuration control number must be located in the family tree (Figure 3.1) to include the reference designation of all higher level assemblies. The reference designation lists, which are titled and presented in alphanumeric order, are divided into columns to aid in locating specific information.

Column content

The following paragraphs provide an explanation of the purpose and contents of each column in the part number indexes.

Ref des column

The 'ref des' column contains the reference designation for a specific part. These designations are assigned in accordance with the requirements of American National Standard Specification ANSI Y32.16.

Description column

This column contains the name and descriptive information for each part. The key word is presented first, followed by the adjective identifiers. When the description is 'See Family Tree for Assembly Nomenclature', the associated part is subject to its own part index table or is contained in an optional kit's list. Look up the reference designation list title (nomenclature) and the reference designation of the associated part in the family tree (Figure 3.1) to determine where to locate its part information.

Nautel # column

This column contains the Nautel number assigned to each part. This number is Nautel's drawing number for Nautel manufactured parts, Nautel's configuration control number for assemblies that are under configuration control management, or Nautel's inventory management number for purchased parts. When a Nautel configuration control number (e.g. NAPE*) is referenced in this column, the associated ref des item is subject to its own part index table.


Issue 0.2 2010-12-17 Page 3-3

Vendor # column

This column contains an original equipment manufacturer's part number for a part. A single part number is listed for each part, even though there may be more than one known manufacturer. The listed number is Nautel's usual or preferred choice. The use of this number does not restrict Nautel from selecting and using commercial equivalents during manufacture, where their use will not degrade circuit operation or reliability.

OEM code column

This column typically contains a five digit coded group as the original equipment manufacturer's (OEM) identifier. The code was extracted from Cataloging Handbook H4/H8 Commercial and Government Entity (Cage) Code. Manufacturers that were not listed in the catalog when this listing was compiled have been assigned a unique five-letter code. This code is assigned arbitrarily and has no other significance. The manufacturers identified for parts that have JAN or MIL part numbers are Nautel's normal supply source for that part.

Note: OEM code 37338 is listed for parts manufactured by Nautel or to a Nautel control drawing. United States of America customers should refer all replacement part orders to Nautel Maine Incorporated (OEM code 57655).

OEM code to manufacturer’s cross-reference

The OEM (CAGE) codes listed in the reference designation lists are representative of the original equipment manufacturers of those parts. To determine a specific part's manufacturer contact information, enter the five-character OEM (CAGE) code for that part in the following website:

https://www.bpn.gov/bincs/begin_search.asp

After entering the OEM (CAGE) code number, manufacturer pertinent information (address, telephone number, fax number, etc.) will be displayed. Please contact Nautel if a part cannot be obtained (see also “On-Line Part Quotes” in the Warranty section of this manual).

Manufacturer's index

For customers without web access, Table 3.1 provides a cross-reference from the original equipment manufacturer's (OEM) codes to the manufacturer's name. The listing is sorted alphanumerically by the OEM code.


Page 3-4 Issue 0.2 2010-12-17

Common abbreviations/acronyms

The following abbreviations/acronyms may appear in the Description of Part column:

• SMTDenotes item is designed to be installed using Surface Mount Technology.

• MTADenotes item is a Mass Termination Assembly connector.

• SIPSingle In-line Package

• DIPDual In-line Package

• IDCDenotes item is an Insulation Displacement connector for ribbon cable.

Table 3.1: OEM Codes / Manufacturers

OEM Code Manufacturer OEM Code Manufacturer00779 CTS Company Incorporated 0DY74 Microsemi Corp-Power Products Grp

01295 Texas Instruments Incorporated 0FMA6 Neutrik USA Inc

01961 Pulse Engineering Inc. 0G343 Huffman Manufacturing Co.

02660 Amphenol Corp., Spectra-Strip/ITD 0GP12 Radiall Inc.

03LB0 Sandisk Corporation 0P2J5 Kingston Technology Company Inc.

04713 Motorola Incorporated 12060 Diodes Inc.

06090 Raychem Corporation 13919 Burr-Brown Corp.

07263 Fairchild Semiconductor Corp 14655 Cornell Dubilier Electronics

07933 Fairchild Semiconductor Corp 15542 Scientific Components Corp.

07EN1 Advanced Monolythic Ceramics 1AA44 Collmer Semiconductor Inc

08779 Signal Transformer Co. Inc. 1E4C5 SEI Electronics Inc.

09482 Amp of Canada Limited 1FN41 Atmel Corporation

09581 3M Canada Incorporated 1JRT7 Epson Electronics American Inc.

0A5K5 IXYS Corporation 1KK13 ITT Industries Incorporated

0AG18 Hirose Electric / USA / Inc. 1MQ07 ZRG Incorporated

0B0A9 Dallas Semiconductor Corporation 1N3T0 Semikron Inc.

0CVK3 Allegro Microsystems Inc. 1W344 United Chemi-Con Mfg Inc.


Issue 0.2 2010-12-17 Page 3-5

OEM Code Manufacturer OEM Code Manufacturer22421 Thomas and Betts Limited 79942 Intel Corp Sales Office

23598 Ross Engineering Corp. 7D893 Fairchild Semiconductor Corporation

23875 M-Tron Industries Incorporated 80294 Bourns Instrument Incorporated

24355 Analog Devices Incorporated 83330 Dialight Corporation, DBA Dialight

27014 National Semiconductor Corporation 90201 Hammond Mfg. Co. Ltd.

27264 Molex Incorporated 91833 Keystone Electronics Corporation

2D829 Cornell Dubilier Electronics Corp. 91929 Honeywell Incorporated

31433 Kemet Electronics Corporation 95146 Alco Electronic Products Inc.

31781 Edac Incorporated 96095 AVX Ceramics, Div of AVX Corp

33062 Ferronics Incorporated AMP/TYCO Tyco Electronics Corporation

35005 Dale Electronics ANALOG D Analog Devices

37338 Nautel Limited ASTEC Astec Power

3CYG3 Sanyo Denki America Inc. AVAGO Avago Technologies

3DX59 Citizen America Corporation AVX CORP AVX Corporation

3EH09 Murata Electronics North America Inc C3057 Conec Elektronische Bauelemente

3USB5 Startech.com USA LLP C4751 Epcos AG

3WCG0 Ferraz Shawmut Incorporated C & D C & D Technologies

45496 Digital Systems COMET

48862 GC Electronics Comp Corp Components Corporation

49588 S B E Incorporated CORNELL See 2D829

4G927 Raychem Corporation CREE INC Cree Inc.

4TKQ5 UPE Inc. ER737 Texas Instruments

54473 Matsushita Electric Corp of America HYPERTR Hypertronics Corporation

54583 TDK Electronics Corp. IDT Integrated Device Technology, Inc.

56289 Sprague Electric Company ITT INDUS See 1KK13

56699 BC Components KEYSTONE See 91833

56845 Vishay Dale Electronics Inc. KYCON Kycon Cable & Connector Inc.

59124 KOA Speer Electronics Inc. LINEAR See 64155

59993 International Rectifier Corp. LITEON Vishay-Liteon Power Semiconductor

5Y407 Phoenix Contact Inc. L3845 Circuit-Test Electronics Ltd.

63590 Premier Industrial Corp. MARKTEC Marktech Optoelectronics

64155 Linear Technology Corporation MICRON Micron Technology, Inc.

65786 Cypress Semiconductor Corp. MINI-CIRC Mini-Circuits

71400 Cooper Bussman Inc. MOLEX Molex Inc.

71468 ITT Corporation NATIONAL See 27014

75042 TRW Incorporated NXP SEMI NXP Semiconductors

75915 Littelfuse World Headquarters ON-SEMI ON Semiconductor



Page 3-6 Issue 0.2 2010-12-17

OEM Code Manufacturer OEM Code ManufacturerPANAS Panasonic SL575 Meanwell Sales Information

PHOENIX See 5Y407 TDK See 54583

SARONIX Saronix TEXAS See ER737

SAW84 IEI Technology Corp. U3040 ST Microelectronics

SB ELE SB Electronics Incorporated VENKEL Venkel Ltd

SCT30 Fairchild WANJIA Wanjia



Issue 0.2 2010-12-17 Page 3-7

Figure 3.1: VS2.5 Family Tree

F2110043 V3

POWER SUPPLY MODULE

UG69A

U1POWER SUPPLY MODULE

UG69A

U2

POWER SUPPLY DISTRIBUTION PWBNAPS43

A2CONTROL/EXCITER PWB

NAPE83A

A1

+48V POWER SUPPLY

UG75

U4

SPLITTER PWBNAPH03

A4

DISPLAY

UW111

U5

POWER AMPLIFIER 1 PWBNAPA31

A6

LOW PASS FILTER PWBNAPF13

A11COMBINER INTERFACE PWB

NAPI139

A12

PRE-AMP/IPA PWBNAPA28A

A5COMBINER PWB

NAPH04

A10

FEED-THRU CAPACITOR INTERFACE PWB211-4270

A14

FEED-THRU CAPACITOR INTERFACE PWBSAME AS A14

A15 - A17

POWER SUPPLY MODULE

UG69A

U3

INTERFACE PWBPR65B

A3

2.5 KW FM BROADCAST TRANSMITTERNARF66 and NARF66/01

VS2.5

POWER AMPLIFIER 2 THRU 4 PWBSAME AS A6

A7 - A9

AUDIO PROCESSOR PWB(OPTIONAL)

A13


Page 3-8 Issue 0.2 2010-12-17

VS2.5 Troubleshooting Manual Wiring/connector lists

Issue 0.2 2010-12-17 Page 4-1

Section 4: Wiring/connector lists

This section contains the wiring information for the hard-wired assemblies of the transmitter, and applicable connector mating information.

Wiring lists provided

Wiring lists are provided in tabular format. Table 4.1 on page 4-2 lists the tables containing wiring information. These tables provide non-printed wiring pattern, point-to-point (source and destination) interconnection information.

Wiring lists not provided

Separate wiring lists are not provided for some assemblies, including:

• Assemblies that have a separate maintenance manual. Refer to the appropriate maintenance manual for detailed wiring information for these assemblies, if provided.

• Assemblies that have their wiring information shown in tables on their assembly detail draw-ing(s). Refer to the Mechanical Drawings section of this manual for detailed wiring information for these assemblies.

Connector mating information

Where applicable, a connector mating table is provided after the corresponding wiring list. Table 4.2 on page 4-2 identifies all provided connector information.

Wire colours

Every effort is made to manufacture assemblies using the wire colour shown in the Colour column of the wiring list tables. Sometimes, a white wire will be substituted for the listed colour. In such cases, wires must be identified by their assigned numbers.

Printed wiring board patterns

Printed wiring pattern information for printed wiring boards (PWBs) is beyond the scope of this manual, and therefore not provided.


Page 4-2 Issue 0.2 2010-12-17

Table 4.1: Wiring Lists Provided

Table # Description

Table 4.3 Wiring List - VS2.5 Transmitter (page 4-3)

Table 4.2: Connector Mating Information Provided

Table # Description

Table 4.4 Connector Mating Information - VS2.5 Transmitter (page 4-6)


Issue 0.2 2010-12-17 Page 4-3

Table 4.3: Wiring List - VS2.5 Transmitter

Source Destination Wire # Colour Size Remarks

TB1-2 P1 1 White 12

P1 DS1-X1 2 White 16

TB2-2 P2 3 White 12

P2 DS1-X2 4 White 16

TB3-2 E2 5 Grn/Yel 12

E1 E2 6 Grn/Yel 12

P3 A2TB1-4 7 White 12

P4 A2TB1-3 8 White 12

E2 A2TB1-2 9 Grn/Yel 12

A2TB2-6 U4-L 10 White 14

A2TB2-5 U4-N 11 White 14

A2TB2-4 U4-GND 12 Grn/Yel 14

U4-(+V) A2TB2-1 13 White 16

U4-(-V) A2TB2-3 14 Black 14

P5-1 P6-2 15 White 22

P5-2 P6-3 16 White 22

P5-15 P6-4 17 Black 22

P5-16 P6-1 18 White 22

P7-1 J5-1 19 Yellow 22

P7-2 J5-2 20 Black 22

P7-3 J5-3 21 Red 22

P8-1 J6-1 22 Yellow 22

P8-2 J6-2 23 Black 22

P8-3 J6-3 24 Red 22

A2TB4-1 A15TB1-3 25 White 12

A2TB3-1 A15TB1-4 26 Black 12

A2TB4-2 A15TB1-1 27 White 12

A2TB3-2 A15TB1-2 28 Black 12

A2TB4-3 A14TB1-3 29 White 12


Page 4-4 Issue 0.2 2010-12-17

A2TB3-3 A14TB1-4 30 Black 12

A2TB4-4 A14TB1-1 31 White 12

A2TB3-4 A14TB1-2 32 Black 12

A2TB2-2 C9E2 33 White 16

W5P1-Center W5P2-Center 34 Conductor - 50 Ohm Coax

W5P1-Shield W5P2-Shield 34 Shield - 50 Ohm Coax

A10-S W6P1-Center 35 Conductor - 50 Ohm Coax

A10-R W6P1-Shield 35 Shield - 50 Ohm Coax

A4-R A5-D 36 White 16

A4-A A5-A - - 24 Link

A4-B A5-B - - 24 Link

A4-C A5-C - - 24 Link

A4-D A6-V - - 24 Link

A4-F A6-X - - 24 Link

A4-G A7-V - - 24 Link

A4-J A7-X - - 24 Link

A4-K A8-V - - 24 Link

A4-M A8-X - - 24 Link

A4-N A9-V - - 24 Link

A4-Q A9-X - - 24 Link

A5-F A10-Z - - 20 Link

A5-H A10-AA - - 20 Link

A6-D A10-CC - - 16 Link

A7-D A10-FF - - 16 Link

A8-D A10-JJ - - 16 Link

A9-D A10-MM - - 16 Link

A10-V A12-D - - 24 Link

A10-T A12-C - - 24 Link

A10-L A12-B - - 24 Link

A10-J A12-A - - 24 Link




Issue 0.2 2010-12-17 Page 4-5

J3-Center A10-C 37 Conductor - 50 Ohm Coax

J3-Shield A10-B 37 Shield - 50 Ohm Coax

J4-Center A10-E 38 Conductor - 50 Ohm Coax

J4-Shield A10-D 38 Shield - 50 Ohm Coax

A16TB1-3 A6-U 39 White 12

A16TB1-4 A6-T 40 Black 12




A17TB1-4 A8-GND 44 Black 12



C9E1 A5-E 47 White 16




Page 4-6 Issue 0.2 2010-12-17

Table 4.4: Connector Mating Information - VS2.5 Transmitter

Connector Mate Remarks

P1 CB1E1 CB1 L1 in

P2 CB1E2 CB1 L2/N in

P3 CB1E3 CB1 L1 out

P4 CB1E4 CB1 L2/N out

P5 U5H1

P6 A1J10

P7 A2J4

P8 A2J5

W1P1 A1J15 Interface I/O

W1P2 A3P1 Interface I/O

W2P1 A1J12 Power Supply Control I/O

W2P2 A2J7 Power Supply Control I/O

W3P1 A1J13 Audio Processor (Optional)

W3P2 A13J1 Audio Processor (Optional

W4P1 A1J11 Low Voltage I/O

W4P2 A2J6 Low Voltage I/O

W5P1 A1J14 RF Drive

W5P2 A4J7 RF Drive

W6P1 A4J8 RF Drive

B1P1 J5 Fan1 Connection

B2P1 J6 Fan2 Connection

B3P1 A4J1 Fan3 Connection





VS2.5 Troubleshooting Manual Reading Electrical Schematics

Issue 0.2 2010-12-17 Page 5-1

Section 5: Reading Electrical Schematics

This section contains electrical schematics and logic diagrams for the transmitter. Block diagrams, simplified electrical schematics, and logic diagrams may be included. Refer to Table 5.1 on page 5-4 for an itemized listing.

Component values

Unless otherwise specified on the logic or schematic diagram, the following defaults apply:

• Resistor values are shown in ohms (K = 1,000 and M = 1,000,000)

• Resistor power ratings are not shown when less than 0.5 W

• Capacitor values are shown in microfarads (uF)

• Unidentified diodes are part number 1N4938 (Nautel Part # QAP29)

Graphic symbols

The graphic symbols used on electrical schematics are in accordance with American National Standard ANSI Y32.2-1975 - Graphic Symbols for Electrical and Electronic Diagrams.

Logic symbols

The logic symbols used on electrical schematics and logic diagrams are in accordance with American National Standard ANSI Y32.14-1975 - Graphic Symbols for Logic Diagrams.

Reference designations

Referenced designations were assigned in accordance with American National Standard ANSI Y32.16-1975 - Reference Designations for Electrical and Electronic Parts and Equipment.

Each electrical symbol is identified with its basic reference designation. To obtain the full reference designation for a specific part, prefix this basic identifier with the reference designation assigned to all higher assemblies. For example, the complete designation for a resistor (R1) on a printed wiring board (A1), that is part of a larger board (A2), would be A2A1R1.


Page 5-2 Issue 0.2 2010-12-17

Unique symbols

Nautel uses unique symbols on electrical schematics to describe logic (two-state) signals. These signals differ from single-state signals or analog signals that may have multiple values.

Type of inputs and outputs

On electrical schematics, names used to describe logic (two-state) input and output signals are prefixed with a # symbol.

Logic level convention

The # prefix identifies an input or output signal that has two distinct states: high and low.

The suffix on an input or output signal name identifies the active (true) state of the signal. The high suffix (+) indicates the more positive of the two levels used to represent the logic states. The low suffix (-) indicates the less positive of the two levels.

Two types of logic, positive and negative, may be represented on a particular schematic. In positive logic, high represents the active (true) state, and low represents the inactive (false) state. In negative logic, low represents the active (true) state, and high represents the inactive (false) state.

Identifying schematic diagrams

Each electrical schematic in this section is identified by a number that is both the figure number and the page number. The numbers are assigned sequentially are prefixed by the letters SD. The electrical schematics and logic diagrams included in this section are listed in Table 5.1 on page 5-4.

Structure of schematics

The electrical schematics are structured in a hierarchical format that is based on function and signal flow. Wherever practical, the signal flow is from left to right. Normally, inputs originate on the left-hand side and outputs extend to the right-hand side. Exceptions are shown by an arrow indicating the direction of signal flow.

Note: The physical location of a part or assembly was not necessarily a factor during creation of the schematic. The full reference designation assigned to a part or assembly, in conjunction with the family tree (see Section 3, “Parts Lists” on page 3-1) and the assembly detail drawings (see Section 6, “Mechanical Drawings” on page 6-1), will identify its location.


Issue 0.2 2010-12-17 Page 5-3

Figures SD-1 and SD-2 identify each major stage and its detailed interconnection. Each stage contains cross-references that identify which blocks are the signal sources for inputs, or the destinations for outputs.

When a sub-function is treated as a block in figures SD-1 and SD-2, its detailed circuit information is included in its own schematic drawing(s), which is also included in this section.

Locating schematic diagram(s) for a functional block

The text inside a functional block provides the key to locating its schematic diagram(s).

1. When a functional block is assigned a reference designation (e.g., A2A1), refer to the family trees in Section 3, “Parts Lists” on page 3-1. Follow the family tree branches to the block that contains the desired reference designation, and associated Nautel nomenclature (e.g., NAPA31 PA PWB). Note the reference designations and Nautel nomenclatures of all higher assemblies in the path, if applicable.Example: A6 NAPA31 PA PWB.

2. Refer to Table 5.1 on page 5-4 and use the reference designation and Nautel nomenclature to identify the appropriate schematic diagram(s).Example: NAPA31 PA PWB is shown on schematic SD-7.

3. If necessary, refer to the referenced figure in the schematics at the end of this section and locate the next, lower-level assembly. Then, repeat this procedure until the desired schematic diagram is found.

Locating a part or assembly on a schematic

The full reference designation assigned to a part or assembly is the key to physically locating that part or assembly.

1. Refer to the family trees in Section 3, “Parts Lists” on page 3-1.

Note: Full reference designations contain the assembly hierarchical coding. When the end item is divided into units (cabinets), the first coding is a unit number (1, 2, 3, etc.). When the end item is divided into assemblies, the first coding is an assembly number (A1, A2, A3, etc.). If a unit or an assembly is divided into sub-assemblies, assembly coding that identifies assembly relationship (1A1, A2A1, A2A1A1, etc.) is added.


Page 5-4 Issue 0.2 2010-12-17

2. Follow the family tree branches to the block that contains the desired reference designation, while noting the Nautel nomenclatures and names of all higher assemblies in the path, as applicable. Example: A5 NAPA31 PA PWB.

3. Refer to Table 6.1 in Section 6, “Mechanical Drawings” on page 6-1. Use the Nautel nomenclature and name of each family tree block in the path, starting at the highest assembly – this is normally Figure MD-1 – to determine the figure number(s) for that assembly. Example: NAPA31 PA PWB is shown on MD-7.

4. Refer to the referenced figure (e.g., MD-7) in Section 6.1, “List of Mechanical Drawings” on page 6-2 to locate the desired part or assembly.

Note: The drawings in the Mechanical Drawings section depict the assembly detail of the transmitter and its modules and assemblies.

Table 5.1: List of Electrical Schematics

Figure # TitleSD-1 VS2.5 Transmitter - Ac-Dc and Exciter/Control Stages (Sheet 1 of 2)

SD-2 VS2.5 Transmitter - Ac-Dc and Exciter/Control Stages (Sheet 2 of 2)

SD-3 VS2.5 Transmitter - RF Drive and RF Power Stages

SD-4 NAPS43 Power Supply Distribution PWB (Sheet 1 of 2)

SD-5 NAPS43 Power Supply Distribution PWB (Sheet 2 of 2)

SD-6 NAPA28A Pre-Amp/IPA PWB

SD-7 NAPA31 PA PWB

Issue 0.2 2010-12-17 SD-1

Figure SD-1: VS2.5 Transmitter - Ac-Dc and Exciter/Control Stages (Sheet 1 of 2)

E1

LINE 1

1

1

J5

P7 J5

PWB

A1

J11

CB1

L2

L1

GND

GNDGND

MOSI

L8

P8

P7

J7

J2

J7

J6

GNDGND

N/A

GNDGND

J12

J11

J15

W1P1

GNDGND

+5V

GND

N/AN/A

TO

1

J4

P8 J6

PART OF

U4

CB1E4

CB1E3

P4

P3

GND

GND

GND

N/A

SCK

J3

J1

GND

GND

N/A

N/A

FROMRF POWER

GROUNDREFERENCE

(47-63 Hz)

FROM ACPOWER SOURCE

PS

PART OF

PA 4 V (-)

PA 2 V (-)

GND

GND

FAN TACH 7

FAN TACH 5

FAN TACH 3

AC GNDTB3

2

3

W1P1

E2

FAN 2 V (+)

FAN 1 V (-)

FAN 1 V (+)

W4P12

12

910

J12J15 7

2013

5

W2P11

+48V POWER L

-V

J6B2P1

J51FAN TACH 1

B1P1

# FAN ENABLE +

# 595_RESET -

PS CTRL V

# 165 LOAD -

# ADC1 CS -

GND

LINE 1

GND

AC GND

LINE 2/NEUTRAL

LINE 1

J4

4

2

J6

PWB

A2

4

6

3

2

3

LOGIC RETURN

# PS TEMP -# PS FAIL -

# PS PRESENT -

POWER SUPPLY

N/CN/C

N/C

AC GNDTX SELECT

LINE 1

# PS INHIBIT +

# PS FAIL -ENABLE RETURN

# PS AC FAIL -

-VE SENSE

-VEMODULE

N/CN/C

+VE SENSEN/C

N/CTX SELECT

+VELINE 2/NEUTRAL

PS CTRL V# PS INHIBIT +

ENABLE RETURNLOGIC RETURN

# PS TEMP -

-VE SENSE# PS PRESENT -

-VE

N/C U1

+VE SENSEN/C

N/CN/C

+VEAC GND

PS CTRL VLINE 1

J3

PWB

A2PS

J1

MISO 165MISO ADC

W2P2

FAN V (-)FAN V (-)

PRE-AMP VPRE-AMP V

PRE-AMP V+15V

FAN V (+)FAN V (+)

FAN V (+)+5V-B

+5V-A+5V-B

+5V-A+5V-A

1819

14

W2P12

8

1617

10

16

13PWB

2011

A1

18

34

1129

26

538

1

24

33

1517

27

2123

30

W5P1J14

STAGE

STAGE

STATION

(180-264VAC)

A2

PWB

PA 3 V (-)

PA 1 V (-)

N/A

GND

FAN TACH 4

FAN TACH 6

TB2

TB1

2

3

X2

X1

DS1A

FAN 2 V (-)

B1

11

15

8

CONTROLEXCITER/

6

3

17

SUPPLYN

+V

P2 CB1E2

P1 CB1E1

1FAN TACH 2

# 595_CS -

PART OF

LINE 2/NEUTRAL

+48V

J5

3

1

PSDISTRIBUTION

PART OF

5

1

1

4

ENABLE RETURN

# PS AC FAIL -

-VE

-VE SENSE

MODULE

N/C U3

+VE

+VE SENSEN/C

N/C

LINE 2/NEUTRAL

PS CTRL V

LOGIC RETURN

# PS TEMP -

# PS PRESENT -

POWER SUPPLYU2

N/C

LINE 1

AC GND

N/C

# PS FAIL -

# PS AC FAIL -

MODULE

N/C

N/C

POWER SUPPLY

TX SELECT

LINE 2/NEUTRAL

# PS INHIBIT +

J2

DISTRIBUTION

PART OF

FAN V (-)

+15V

+5V-B

W4P2

NOTES:

16

4

7

15

9

14

12

19

5

W4P1L8

28

24

3

6

39

19

13

25

22

W5L1

B2

S2110020 VE

DISTRIBUTION

2

3B1P1

HEATSINK TEMP 2 (-)HEATSINK TEMP 2 (+)

109

37

REFLD PWR SAMPLE 4035

HEATSINK TEMP 1 (+) 7

IPA FWD PWR SAMPLE2032

16

12

2

LINE 2/NEUTRAL 2

33

2831

38

20

1718

15

421343

1240

45 929 101

47 7

27 5

3121

36

24

18192

W4P2

1612

131444

43910

22417

101139

292013

8465

5623

271

W2P2

2133

28

2438

1920

17

144415

2242

11391240

45 9

23 647 7

DENOTES TB3

DENOTES TB2

PWB CONNECTOR J1 ARE BLIND-MATE CONNECTIONS.POWER SUPPLY MODULE CONNECTOR J1 AND PS DISTRIBUTION

1819

14 PRE-AMP V

FAN V (+)

2

FAN V (+)8

FAN V (-)16FAN V (-)17

10

16

PA BIAS 113

PA BIAS 120PA BIAS 111

18 PRE-AMP BIAS

RF DRIVE34

PART OF

PA 3 V (+)

PA 4 V (+)4

PA 1 V (+)

PA 2 V (+)2

IPA V2

RF POWER

2

3B2P1

FWD PWR SAMPLE

HEATSINK TEMP 1 (-)

36

34

8

31

14

18

2

21

36

24

19

16

14441

2241

1139

46 8

23 6

33

28

38

20

17

15

42

11

15

8

12

9

747

45

406

3

17

31

36

18

16

1343

41

29 10

46 8

27 5

DENOTES TB4

DENOTES TB1

PRE-AMP V16

4 PRE-AMP V

FAN V (+)

FAN V (-)7

15

9

14

PA BIAS 112

IPA BIAS19

5

EXCITER/CONTROL

PART OF

3

1

Issue 0.2 2010-12-17 SD-2

Figure SD-2: VS2.5 Transmitter - Ac-Dc and Exciter/Control Stages (Sheet 2 of 2)

J2A

J3

J5B

J13 J1

P5

J10

D-

D-

J1 J2A

PWB

A13

TO

U5

RI

V-

V-

V-

D-

SOURCEEXTERNAL

FROMEXTERNAL

CONTROLLERREMOTE

FROM EXTERNAL

10 MHz IN

HD DATA (-)

HD UPGRADE RX (-)HD UPGRADE RX (+)

EXT +15V IN

# INTERLOCK -GND

# PRESET 5 -

# PRESET 3 -# PRESET 2 -

# PWR DECREASE -

# RF OFF -# RF ON -

EXT +15V IN

MPX SCA 1 IN

MPX BAL/UNBAL IN

ANALOG AES/EBU IN (-)

1 PPS INGND

MPX SCA 3 IN

J2B

CONTROL

PART OF

GNDGND

GND

GND

GND

GNDGND

AUDIO PROC RX

GNDGND

AUDIO PROC TXGND

I2S_PROC_DATA_INI2S_LRCK

+3.3V-DI2S_BCK

+5V-B

PROCESSOR DISPLAYH1

GND 4LCD RX

P62LCD TX

8

J5A65

2

1

J17

1

J2A 12

8

54

3PWB

1A1

J161

3

J8C1

3

J8B1

3

PILOT SAMPLE OUT

CTS

DSRGND

RXD

DCD

HD UPGRADE TX (-)# RF MUTE -

HD UPGRADE TX (+)

N/A

N/AN/A

RX+

TX+

V+

D+

V+

D+

V+

D+

FROM

EXCITER

FROM

GND

HD DATA (+)

GND

# PRESET 1 -

GND

# PRESET 4 -

# PWR INCREASE -

# RESET -

MPX SCA 2/RDS IN

GND

A1

PWB

EXCITER/

GND

I2S_PROC_DATA_OUT

+5V-B

(OPTIONAL)

AUDIOEXCITER

+5V 1

3

9

4

7

3

8

24

2

13

J8A6

4

7

2EXCITER/

PART OF

CONTROL

4

4

2

2

2

DTR

RTS

TXD

GND

RX-

N/A

TX-

J4A

J4B

5

63

21

2019

18

174

2

87

9

J7

ANALOG AES/EBU IN (+)32

PROGRAM SOURCES

BALANCED ANALOG AUDIO (RIGHT +)/SCA 2 (+) IN7BALANCED ANALOG AUDIO (RIGHT -)/SCA 2 (-) IN2

3BALANCED ANALOG AUDIO (SHIELD) INBALANCED ANALOG AUDIO (LEFT +)/SCA 1(+) IN

65

1

116

10 +15V OUT

10PA VOLTAGE SAMPLE

2221 FORWARD POWER SAMPLE

REFLECTED POWER SAMPLE

12 # POWER SUPPLY FAULT ALARM -# IPA/PA FAULT ALRM -

98 # LOW RF ALARM - MONITOR

# HIGH REFLECTED POWER ALARM -

REMOTE

6 # HIGH PA TEMP ALARM -# INTERLOCK OPEN ALARM -

35

# SUMMARY ALARM -

24 TOTAL PA CURRENT SAMPLE

1519 # PRESET 5 STATUS -

17 # PRESET 3 STATUS -# PRESET 2 STATUS -

142 # REMOTE STATUS -

# PRESET 1 STATUS -

10 10

18

18

4 4

213

2POWER SUPPLY

13 POWER AMPLIFIER

11 11A13W1P1 A13W1P2

15

1

RDS/RBDS

EXCITERTO EXTERNAL

EXTERNAL LAN

INTERNAL USB

EXTERNALUSB DEVICE

S2110022 VD

16

4

23

15

3

5

14

1

J6A

J6B

ANALOG AES/EBU IN SHIELD 1

8BALANCED ANALOG AUDIO (LEFT -)/SCA 1 (-) IN

4

9

22

13

+15V OUT

25

23

# AC OK STATUS -

7

25

11

4

# EXTERNAL FAULT ALARM -

18

1

20

16

# PRESET 4 STATUS -

# RF ON STATUS -

5

7

6

3

5

OUTPUT NETWORK

7

6

3

12 12

16

2

TO/FROM

TO/FROM

ANALOG AES/EBU OUT (+)ANALOG AES/EBU OUT SHIELD

ANALOG AES/EBU OUT (-)

Issue 0.2 2010-12-17 SD-3

Figure SD-3: VS2.5 Transmitter - RF Drive and RF Power Stages

1

3

1

A

C

P2

P3

C9

J1

J6

1

1

IN

ISO

C7

1

1

1

1

0

-90

0.1C29

1

1

*

*

A17

0.01C27

1

J51

1

J3

J2

J1

+

+

-

+

-

-

0.1C4

1.0C5

B

Y

M

M

Y

U

X

1

1

A4

A5

A9

A8

A7

*

*

*

E2

C6

C4

* *

U13dB

*

A14

A15

*

W

R

B

J4

J3

J2

3

A

C

C1

C3

1

E2

R26332 274

R23

E1

1

1

1

1

1

0.1C10

0.1C17

1

0.1C3

A16

681R11

0.01C9

0.01C15

0.01C2

30W100R3

1

J4

1

1

150R5

150R20

-

-

+

+

TP3

IPA BIAS

IPA V

1.0C2

1.0C14

GA

E

D

C

UX

V

V

B

U

B

X

V

V

U

Y

B

TP2

TP4

1

1

1

IPA

A6

P1

A10

*

C8

**C1

E1

E2

Y

**C3

R2100

*

*

U

S

V

T

D

C

E

A

J

K

L

M

**C6

GF

221R6

0.1C23

121R12

0.01C21

30W100R1

150R8

YX

MB

M

TP1

STAGECONTROL

FROM

CONTROL STAGEFROM EXCITER/

CONTROL STAGEFROM EXCITER/

S2110023 VF

FAN V (-)

FAN V (-)

FAN V (+)FAN V (+)

GND

GND

PA BIAS 2

PA BIAS 2

PA BIAS 1

PA BIAS 1PA BIAS 1

PRE-AMP BIAS

PRE-AMP VPRE-AMP V

RF DRIVE

IPA V

PA 4 V (+)

PA 3 V (+)

PA 2 V (+)

6

2

3

11PWB

31 A3PART OF

17

15

27

2321

30

2624

IPA OUTPUT

E2A14

PART OF

B

D

RT5

28

5

16

1

14

12

16

22

24

23

26

J7W5P2

J8W6P1

E2 E1

C5

0.01C28

SPLITTER PWBA4

*

*

U1

*

A 1

C 3

1

PART OF

4COM

3RF_IN

3RF_IN

3

2

3B5P1

2

3B4P1

2

B3P1

K

B

P

F

2FLTR

6VRMS

1V+ 0.01

C9

2FLTR

5ENBL

1V+

2FLTR

4.7C17

5ENBL

+5V

L5

L4

L3

10C1 PWR

10.0KR2

PWRFWD

IPAFWD

1J5B7P1

1

0.01C18

0.01C19

0.01C12

0.01C13

J2B4P1

J11

B3P1

RT1

RT2

PART OF

PA 1

11

5

12

8

6

3

10

8

2

13

P3J617

A3PART OF

LLC

G

G

CEE

A

CC

D

A17PART OF

A16

4 D

*

GNDREFLD PWR SAMPLE

N/A

GND

GND

GND

IPA FWD PWR SAMPLE

FAN TACH 7

FAN TACH 6

FAN TACH 5

FAN TACH 4

HEATSINK TEMP 2 (-)HEATSINK TEMP 2 (+)

HEATSINK TEMP 1 (+)HEATSINK TEMP 1 (-)

A11

C2PART OF

4D

TO EXCITER/

IPA FWD PWR (-)

IPA FWD PWR (+)

RF MONITOR

RF OUTPUT

FWD PWR

CONTROL STAGETO EXCITER/

EXCITER/

+5V

FAN V (-)

FAN V (+)

GND

PA BIAS 2

PA BIAS 2

IPA BIAS

PA BIAS 1

PRE-AMP V

PA 1 V (+)

38

4

5

1

13

29

19

22

P1W1P2

25

28

PART OF

A15

C

9

49.9R18

RT4

27

7

3

9

N/C25

15

21

18

20

30W

R250

E2 E1

E1

E2

68.1R17

150pFC19274

R25332R22

R2168.1

R2482.5

0.01C11

0.01C16

0.01C4

0.01C26

PART OF

*

PART OF

A

C 3

3RF_IN

4COM

681R15

68.1R9

4COM

2

3

2

B7P1

B6P1

3

N

DG

A

R

C

L

H

Q

M

J

5ENBL

6VRMS

4.7C12 0.01

C3

6VRMS

1V+ 0.01

C13

10.0KR3

L7

L6

SMPL

10.0KR1

SMPL10C6

REFLD

PWRSMPL10

C15

10.0KR19

J4

0.01C24

0.01C25

0.01C30

0.01C31

B6P1

J3

1

1

0.01C5

0.01C6

B5P1

SPLITTER PWB

U

VS

T

0.01C32

0.01C7

PRE-AMP/

PA 4

PA 2

PA 3

7

10

1

4

J1 P22

4

6

19

11

INTERFACE PWB

ZF

AAH

AMM

D

NNW

WKK

T

A

T

D

W

FF

GG

DD

BB

W

A

C

T

NOTES:

W1P2

50250W

R650250W

R950250W

R10

2 B

4 D

PART OF

2 B

Q A

P N

E2E1

FWD PWR SAMPLE

FAN TACH 3

X

100R3

100R4 R1

100

LOW PASS FILTER PWB

**C4

**C2

L2 L3

2B

4D

PART OF

2B

4.7pFC1

C24.7pF

20pFC8

**C5

18pFC7

L5

CONTROL STAGE

IPA OUTPUT

RF SAMPLE

TO ANTENNA

REFLD PWR

B

L6

A

0.01C22

0.01C8

0.01C14

121R4

221R14

E CHH

DJJ

GT

G250W

R8100

REFLD PWR

COMBINER

FWD PWR

IPA FWD PWR (+)

E1

PRE-AMP BIAS

RF DRIVE

PA 4 RF DRIVEPA 4 V (+)

PA 3 RF DRIVE

PA 2 BIAS

PA 2 V (+)

PA 1 BIAS

PA 1 RF DRIVE

40

35

34

37

33

20

18

14

9

87

COMBINER PWB

E1

PA 2 V (-)

PA 1 V (-)

A12

INTERFACEPWB

IPA FWD PWR (-)

RXE050

RXE050RT3

INTERFACE

0.01C20

RT1RXE050

ADL5501U2

ADL5501U1

R16221 0.1

C11

R7121

0.1C18

ADL5501U3L1

0.0175μH

B7

B5

B4

t°

10K @ 25C

B3

PRE-AMP V

PA 4 BIAS

PA 3 BIAS

PA 3 V (+)

PA 2 RF DRIVE

GND

PA 1 V (+)

39

36

32

** DENOTES CAPACITANCE IS FORMED BY PADS ON PWB.

12

16

10

L4L150250W

R5

E1

E2

PA 4 V (-)

PA 3 V (-)

RXE050

RT2RXE050

0.01C1

R131000

B6

t°

10K @ 25C

100250W

R7

* DENOTES A MICRO-STRIP OR STRIPLINE TRANSMISSION LINE OF SPECIFIC LENGTH AND CHARACTERISTIC IMPEDANCE.

Issue 0.2 2010-12-17 SD-4

Figure SD-4: NAPS43 Power Supply Distribution PWB (Sheet 1 of 2)

2A

7N/C

4GND

3N/C

CUR

7N/C

4GND

6N/C

3N/C

5OUT

7N/C

4GND

6N/C

5OUT3N/C

2A

0.1C71

SCK

*

9J6

10KR73

5W0.005R98

5W0.005R71

R700.0055W

5W0.005

R4

R30.0055W

TP23

5W0.002R89

5W0.002R92

5W0.002R96

6N/C

5OUT

3N/C

6N/C

5OUT

7N/C

4GND

6N/C

5OUT3N/C

4GND

7N/C

R83475K

R84475K

R87475K

0.1C72

10A

0.01C73

6J6

2J7

15K

R970.0055W

5W0.002R90

R51475K

R85475K

19 J718 J7

15 J7

11 J710 J7

8 J7

# ADC1 CS -

SCK

1 J7

MOSI 20 J7

19 J3

-VE (PS C)17 J3

14 J3

12 J3

+VE (PS C)9 J3

10 J3

7 J3

5 J3

19 J2

20 J2

-VE (PS B)17 J2

14 J2

15 J2

12 J2

10 J2

7 J2

5 J2

19 J1

20 J1

-VE (PS A)17 J1

15 J114 J1

12 J1

10 J1

7 J1

5 J1

+5V-A

0.1C60

+5V-A

RETURN

RETURN

0.01C108

RETURN

PS B ENABLERETURN

0.01C65

RETURN

PS A ENABLERETURN

0.01C15

+48V

22J3 +VE SENSE (PS C)

22J2 +VE SENSE (PS B)

22J1 +VE SENSE (PS A)

+48V

8 RS-

1 RS+

+5V-A 2 VCC

+5V-A 2VCC

8 RS-

1RS+

PRE-AMP

0.01C82

8RS-

+5V-A 2VCC

1 RS+

0.01C84

8RS-

+5V-A 2 VCC

1 RS+

6N/C

5OUT

0.1C75

0.1C81

R6582.5K

0.1C67

6810R68

19EOC

10GND

14REF+

0.1C17

0.1C58

NAPS43

+4.096V

PRE-AMP V

IPA V

PA 4 V (-)

PA 2 V (-)

PA 4 V (+)

PA 3 V (+)

PA 2 V (+)

16 J7

9 J7

12 J7

17 J7

20 J3

18 J3

8 J3

15 J3

16 J3

11 J3

13 J3

18 J2

16 J2

6 J3

+VE (PS B)

11 J2

13 J2

9 J28 J2

6 J2

18 J1

16 J1

13 J1

+VE (PS A)8 J1

9 J1

6 J1

11 J1

+5V-A

0.1C76

PS C LOGIC 33 J3

21 J3

36W0.01R86

PS B LOGIC 33 J2

21 J2

36W0.01R54

PS A LOGIC 33 J1

21 J1

36W0.01R53

+4.096V

10.0KR80

24J3 -VE SENSE (PS C)

24J2 -VE SENSE (PS B)

24J1 -VE SENSE (PS A)

10A

0.01C52

F17A

0.1R55

0.01C48

3.6μHL14

0.01C30

TP13

+5V-A

0.01C85

2VCC

1RS+

+5V-A

0.01C83

0.01C86

8RS-

2 VCC

0.01C88

0.01C89

1 RS+

8RS-

CURIPA

R30475K

3N/C

7N/C

4GND

TP12

CR30603ESDA-TR24V

R62121K

TP24

TP26

TP27

R58100

R59100

3

2

1U8:A

0.1C74R72

10.0K

TP22

0.1C64

R6010010

9

8U8:C

0.1C80

R7710012

13

14U11:D

0.1C77

R78100

R7910010

9

8U11:C

0.1C68

0.1C69

22.1KR64

R6610.0K 15.0K

R69

16DATA_OUT

13REF-

0.1C106

0.1C107

20VCC

L13

L15

MOSI

+5V-A

0.1C98

TO SHEET 2

MISO ADC

PA 1 V (-)

PA 3 V (-)

PA 1 V (+)

0.1C79

1.0C78

35V

0.01C31

0.01C87

5

6

7U8:B

TP25

R741003

2

1U11:A

*R73

R63100K

5

6

7U11:B

TLC1543IDWU9

S2110077 SHEET 1 OF 2 V3

PS C ENABLE

0.1C109

0.1C66

0.1C16

+4.096V

0.1C61

MAX4080SASAU7

+4.096V

PA 2 CUR

MAX4080SASAU14

PA 4 CUR

+5V-B

+15V

10J6

6A5

12A10

15 CS

17 ADDRESS

* DENOTES SEE CHART BELOW FOR COMPONENT VALUE

1A0

2 A1

5 A4

0.01C70

4

2

4

3

4VDD

11GNDU8:E

TLV2374ID

4VDD

11GNDU11:E

TLV2374ID

0.1C59R5

1W0.015 MAX4080SASA

U3

CR40603ESDA-TR24V

CR50603ESDA-TR24V

4750R61

1.82MR75

MAX4080SASAU12

PA 1 CUR

1.82MR81

MAX4080SASAU13

PA 3 CUR

1.82MR76

MAX4080SASAU15

+48V

2

CR60603ESDA-TR24V

9 A8

18 I/O_CLK

11A9

NAPS43/01

7 A6

8A7

DENOTES TB1 DENOTES TB5

DENOTES TB2

DENOTES TB3

DENOTES TB4

DENOTES TB6

DENOTES TB7

DENOTES TB8

4 A3

0.1C102

3A2

1

3

2

1

4VIN

1GND1

2GND2

6VOUTLT1790BIS6-4.096

U10

RT4RXE110

1.82MR82

Issue 0.2 2010-12-17 SD-5

Figure SD-5: NAPS43 Power Supply Distribution PWB (Sheet 2 of 2)

U15-C

1 J5

5 J7

AC A

AC B

R45100

R15100

1.0C95

1.0C94

0.1C90

30A

30A

+15V+5VB

L18

45J3

45J1

46J2

47J2

3J5

2J5

7J6

8J6

+15V

U15-A

1 J4TP9

MP A

0.1C29

MP B

TP4

R46100

R47100

R14100

R12100

R13100

R42100

R43100

R8100

R9100

R10100

R40100

TP3

0.68C44

0.68C46

1.0C3

1.0C114

4J7

0.1C1

0.1C110

LINE 1

0.1C7

30A

TP2

+15V

+5VA

4A

L11

45J2

46J3

47J3

2J43J4

47J1 LINE

R44100

R41100

R11100

1.0C8

1.0C6

L33

L248 V+ 1

7 J7

28 J3

31 J2

28 J1

36 J2

36 J1

FROM SHEET 1

GND

+48V +48V

0.01C26

0.01C25

GNDGND

0.01C23

0.01C39

0.01C40

0.01C42

1.0C101

0.01C100

1.0C96

0.1C99

10SA

7QH

15CLK_INH

7QH

16VCC

MC74HC165ADU4

14 A

0.1C43

+5V-A

+5V-A

3 ON/OFF

1 VIN+5

TRIM

5TRIM

2 VIN-

2VIN-

3ON/OFF

1 VIN+

4QE

3QD

2QC

0.1C105

0.01C104

AC GND 2

3

0.01C53

332R94

44J1 44J2

42J1 42J2

+48V

+48V

L21

L19

0.1C63

L22

L10

U17-E

U17-D

27J3

R31100

0.01C18

4

6

1A

17J6

15J6

L1711J6

23J2

+5V-A

L4

L5

L6

6 J7

31 J3

TP19

MOSI

38 J3

36 J3

TP1731 J1 FAIL A

TP6

TP15

TP5

TP14

28 J2

TMP A

38 J2

SCK

TP8

38 J1

+48V

10KR6

100KR7

0.01C22

+5V-A +5V-A

0.01C21

+5V-A

+5V-A

10.0KR20

+5V-A+5V-A

10.0KR19

TP28TP21

0.68C45

0.68C47

0.01C19

0.01C35

+5V-A+5V-A +5V-A

0.01C36

+5V-A

+5V-A+5V-A

10.0KR17

10.0KR32

+5V-A+5V-A

10.0KR33

RT7RXE110

1 2

U2:A

3 4

U2:B

0.01C38

+5V-A

+5V-A

10.0KR35

1.0C10

1.0C120

0.01C119

1.0C1160.1

C118

8GND

15CLK_INH

16VCC

MC74HC165ADU5

9QH

8GND

9QH

1.0C115

+5V-A

+5V-A

0.1C27

MISO 165

2VIN-

3ON/OFF

1VIN+

SW003A0A91ZU16

5 TRIMSW003A0A91Z

U17

MC74HC595ADU6

1QB

15QA

10C9

35V 0.01C5

TP110C103

16V

TP11

10.0KR26

10.0KR27

10.0KR28

4

2 J6R52

1000

13 J7

DS1G

1500R1

DS3G

39J1

43J1

39J2

43J2

RT5RXE050

2A

82.5KR50

V CTRL

RT3

RXE2

50

0.1C62

L23

L24

L9

L8

0.1C51

27J2

0.01C28

0.01C34

R25100

27J1

46J1

5

0.01C50

1A

L20

L16

16J6

13J60.01C55 12J6

23J1

23J3

+5V-B

TP18

TP16

TP7

TP10

DS2G

RT2RXE250

10.0KR24

10.0KR23

L7

10.0KR21

10.0KR36

10.0KR37

RT1RXE110

RT8RXE110

10.0KR39

1.0C11

0.01C12

0.1C13

SW001A0C91U1

TP200.1C12310

C121

16V 0.01C122

DS4G

332R101

22.1KR49

RT6RXE050

R16100

0.01C57

# 595 RESET -

FROM SHEET 1

0.01C24

# PS C TEMP -TMP C

FAN TACH 2

AC C

# PS C PRESENT -

# PS B FAIL -FAIL B

# PS B TEMP -

# PS A TEMP -

# PS B AC FAIL -

# PS A AC FAIL -

# PS A PRESENT -

# 165 LOAD -

1.0C92

0.01C91

1.0C97

13 OE

0.01C41

7QH

14D

10RESET

3E

0.1C33

1 SHIFT/LOAD

10 SA

11 A

14D

3 E

4F

1 SHIFT/LOAD

4VOUT+ 14J6

19J6+5V-B

6VOUT-

+5V-A5J6

4VOUT+ 3J6

+5V A

# PS C INH +11 10

U2:E

# PS B INH +

44J3

42J3

GND/EARTH

LINE 2/NEUTRAL LINE/NEUTRAL

FAN 6 V (-)

FAN 7 V (+)FAN 7 V (-)

FAN V (-)

PS CTRL V + PS CTRL V

S2110077 SHEET 2 OF 2 V3

# 595 CS -

# PS C FAIL -FAIL C

MP C

# PS C AC FAIL -

FAN TACH 1

# PS A FAIL -

0.01C20

# PS B PRESENT -

TMP B

10.0KR18

CR20603ESDA-TR24V

1.0C14

0.01C2

1.0C112

0.01C111

10μHL25

1.0C117

12 LATCH_CLK

10μHL26

6QG

5 QF

13 C

11 A

12B

11 SHIFT_CLK

8GND

9SQH

6 H

5G

4F

16 VCC

0.01C37

2 CLK

12B

13C

5 G

0.1C32

6H

2 CLK

10.0KR34 CR1

0603ESDA-TR24V

6VOUT-+15V 1J6

6VOUT-

4VOUT+

10.0KR2

+5V B

10.0KR95

18J6

20J6

10.0KR102

10.0KR48

10.0KR29

4J6

9 8

U2:D

39J3

# PS A INH +5 6

U2:C

43J3

0.1C49

FAN 6 V (+)

0.1C54# FAN ENABLE + Q3

MMBT4401LT1 FAN V (+)

10.0KR22

10μHL1

10.0KR38

0.1C56

Q2IRF9540NSPBF

14 VCC 7GNDU2:GMM74HC14M

Issue 0.2 2010-12-17 SD-6

Figure SD-6: NAPA28A Pre-Amp/IPA PWB

82.5R1

PRE-AMP BIAS

RF DRIVE

IPA V

0.1C7

0.022C8

0.022C9

L10.043μH

1000pFC20

RF OUTPUT

IPA BIAS

PRE-AMP V

0.022C4

0.022C5

0.1C3

L60.022C12

0.1C10

L110.0175μH

0.5W

R227.4

L40.043μH

L50.082μH

L70.12μH1000pF

C15

12pFC13

12pFC14

10pFC17

47pFC18

C19470uF63V

0.022C21

0.1C24

0.022C22

L150.028μH

0.001C23

30pFC25

30pFC26 C28

1000pF

L80.0355μH C16

1000pFL10

0.033μH

S2110063 V1

L2

L13

L3 L12

R3121

C11000pF

Q1MRF6V2010N

1000pFC6

47pFC2

C2968uF63V

0.022C11

L140.082μH

L160.012μH

L170.012μH 30pF

C27

L90.0355μH

Q2MRF6V2150NBR1

Issue 0.2 2010-12-17 SD-7

Figure SD-7: NAPA31 PA PWB

T

X

U

B

T3

R4

2W4.7

R5

2W4.7

C110.01

T1

Y

A

M

V

L4

G

W

RF DRIVE

PA BIAS

PA V

5.1V

CR21SMB5918B

0.1C20

10C21

10C22

T2:B

T2:A

C17470pF

C130.01

D

L2100nH 36pF

C18

470μFC4

63V470μFC5

63V470μFC1

63V470μFC2

63V470μFC3

63V

Q1:AMRF6VP11KHR6

C100.001

C70.001

C120.001

C160.001

C190.001

2pFC14

15pFC15

C

C60.1

2W

R310

CR1BAT54HT1 2740

R12W

R210

Q1:BMRF6VP11KHR6

C80.001

C90.001

RF OUTL15nH

L35nH

F130A

1191S-D SHEET 1 OF 1 VB

VS2.5 Troubleshooting Manual Mechanical Drawings

Issue 0.2 2010-12-17 Page 6-1

Section 6: Mechanical Drawings

This section contains mechanical drawings for assemblies of the transmitter. Dimensional drawings may be included. Refer to Table 6.1 on page 6-2 for an itemized list.

Assembly detail drawings for assemblies and modules that have separate manuals are not included. Refer to the appropriate maintenance manual for the assembly detail of these assemblies.

Identifying mechanical drawings

Each mechanical drawing in this section is identified by a number that is both the figure number and the page number. The numbers are assigned sequentially and are prefixed by the letters MD. Drawings in this section are listed in Table 6.1 on page 6-2.

Content of mechanical drawings

Mechanical drawings are illustrations that depict the location of electrical components and show assembly outline detail. Dimensional information is included, where appropriate.

When a module or assembly is the subject of its own assembly detail drawing, and it is also shown in a higher level assembly, the detail depicted in the higher level assembly may have minor differences from the module or assembly actually installed. In this case, always refer to the assembly detail drawing of the module or assembly for detailed information.

Locating a part or assembly on a mechanical drawing

1. When a part or assembly is assigned a reference designation (e.g., A2 or A2R1), refer to the family trees in Section 3, “Parts Lists” on page 3-1. Follow the family tree branches to the block that contains the desired reference designation and Nautel nomenclature (e.g., NAPA31 PA PWB). Note the reference designations and Nautel nomenclatures of all higher assemblies in the path, as applicable.Example: A6 NAPA31 PA PWB.

2. Refer to Table 6.1 on page 6-2. Use the reference designation and Nautel nomenclature to identify the appropriate mechanical drawing. Example: NAPA31 PA PWB is shown on schematic MD-7.

VS2.5 Troubleshooting Manual Mechanical Drawings

Page 6-2 Issue 0.2 2010-12-17

3. If necessary, refer to the referenced figure (e.g., MD-7) in the mechanical drawings at the end of this section and locate the next, lower-level assembly. Then, repeat this procedure until the desired part or assembly is found.

Table 6.1: List of Mechanical Drawings

Figure # TitleMD-1 VS2.5 Transmitter (Front, Rear and Top Views)

MD-2 VS2.5 Transmitter (Bottom and Side Views)

MD-3 NAPE83A Exciter/Control PWB

MD-4 NAPS43 and /01 PS Distribution PWB

MD-5 NAPH03 Splitter PWB

MD-6 NAPA28A Pre-Amp/IPA PWB

MD-7 NAPA31 PA PWB

MD-8 NAPH04 Combiner PWB

MD-9 NAPF13 RF Low Pass Filter PWB

MD-10 NAPI139 Combiner Interface PWB

Issue 0.2 2010-12-17 MD-1

Figure MD-1: VS2.5 Transmitter (Front, Rear and Top Views)

TOP VIEW(COVER REMOVED)

EXCITER/CONTROL PWB

FRONT VIEW

PSDISTRIBUTION

PWB

POWERSUPPLYMODULES

REAR VIEW

U1(A)

U2(B)

U3(C)

A1

L8

B1 B2

A2EXCITER DECK

SECURING SCREWS(QTY 5)

U4

48 V POWERSUPPLY

Issue 0.2 2010-12-17 MD-2

Figure MD-2: VS2.5 Transmitter (Bottom and Side Views)

BOTTOM VIEW(COVER REMOVED)

RIGHT SIDE VIEW

COMBINERINTERFACE

PWB

PA PWBs(A6 - A9)

PRE-AMP/IPA PWB

INTERFACE PWB

COMBINERPWB

SPLITTERPWB

B7 B3B4B5B6A3

A5

A4

A12

A10

RF LOW PASSFILTER PWB

A11

Issue 0.2 2010-12-17 MD-3

Figure MD-3: NAPE83A Exciter/Control PWB

C5

R21

5

C15

3

R24

R22

4

C168

C18

5

C204

L14

R282

C276

C60

C311

C87

R131 C465

R14

1

R1

C4

C3

C9

C8

L4

C12

2C

123

C13

7C

133

R201

C18

C19

R21

6R

217

C25

C16

4R

359

CR

5C

R4

C46

1

R29

R25

C16

3

C161

C15

8C

155

R38

R23

2R

230

C19

4

C18

4C

183

C43

C42

R16

1

R247

C19

7C

198

C93

R24

4

R65

R64

C38 C

46C

216

R25

0

C23

5C

222

C22

3C

217

R253

C24

5C

246

C23

9C

237

C59

C61

C63

Q3

C41

8

C26

5

R88

C65

C46

3R

361

C28

5

R27

8

C26

7R

281

C69

R89

C29

3C

295

C29

0C

294

C29

6

C288

R28

6R

285

U52

CR

2C

R3

C31

0C

R16

C33

2C

331

C31

2

C30

5

C82

C47

6C

345

C34

1R

308

R30

7R

304

U65

C89

C86

C35

7

R11

4R

113

R11

2

R104

R108

C37

5

C370

C36

7

R12

5R

122

R11

8

R11

7R

T1C

392

C386

C38

5

C14

1R

48C

380

R31

9

C18

2C

400

C10

0C

101

R12

9

R130

R33

1R

332

C41

9

C42

0C

417

L19

C42

8C

426

R140

R14

2

R15

5

R18

0

R179

R177

R34

6R

13

C46

0R

357

C12

C12

1

C16

R14

C14

R18

R20

3

C20

R19

C42

1C

411

R21

4

C27

C26

R23

R22

5C

156

C43

2R

36

R23

1

R16

2R

246

C20

7

C242

R25

8

C23

8R

257

R26

6

C26

4

C31

6C

317

C21

0R

310

C32

8

C92

R10

9R

105

C37

4

R12

1R

119

C39

1C

383

C38

8

C10

2C

107

C42

9

C427

R33

8 C43

6C

435

R34

4

C44

4

R15

7

TP2

TP1

L1

C7 R9R8

R4R5

U4

C2

R2

C132C131

C129

C127

C125R193

R192

C124

R191

R190

R186

L11

C33

R28

C31

C431

L8

R26

R15 R30

C15

4

C467R174

C14

9

R21

3

C147

C145

R21

8

R227R226

C14

2

R71C48

R62

R58R56

R57R39

R52R51

R53U26

R41

R318 R49 R327

C36 C40

R45

C220

R243R24

0 R242

C191

C214L24 R248R238

C213

C211

C199

R306

R78

TP9

C55

C52

R76

R83

C62

U39R287

R82

R80

C261

C253

R262

C260C251C257C250

C249C248C247

C256

R261

T1C266

C73C72 R98

R97L17

C77

U53

R279

C66

R95

C302

C284

C325C324

R302

C315C306

R283

R12

4

R107

TP19 R123

R99

C85

R324C365

R323

C363 R321C362

C381

C384

R320

C368

C347

C103

R150

R15

1

TP15

R148

R14

6

TP16 R154

R128R136

R133

C423

R330

C433

R33

3

L27R339

R171R170R169

R167C466R166

R164R16

3

R161R160

C116

R184

R182

R175 R362

C459

C457

C45

5

R354C447

R351C446

R352

L29

L31L30

L3

U2

R6 R7

L2

C11

1

J10

C1

C6

R3

C128

C126

R19

4

C119

C120

R185

R32

C34

TP4

R31

C29

L12

R27

TP5

U10

L7

C23

C22

C32

L10

U11

U7

U9

R16C440

U6

C30

C17

E1

1

C17

0C167

C152

C14

0

C150

C15

1

C16

0R

360

C14

6

C148C464

C139

C13

8

R21

2

CR

11

R22

2R

223

C14

3C

144

C157

C15

9

CR

6C

R7

CR

8

R22

0

C16

2

R32

6C

379

R31

7

U20

TP7

R74

R63

U24

U25

L13

C47

U16

U19

R54

C41

C45

R59R67

R61R60

U27

C37

C37

6 U21

R40 R311

C39

R46

C20

6

C19

5

C22

1

C21

8

C19

3

C17

8

C205

C182 C192C219

Y5

C20

0

C202

C18

8C

187

C19

0

C189

C17

3

C201

C181

R249

C212

C196

R25

1C

215C180

R23

9

R241

C20

8C

209C203

R24

5

CR

12

C95

C171

U37

R85

R313

C56

U42

U36 U43

R77U109

TP8 C46

2R

358 U31

TP20C57

C51 U

38

C54

C320 R297R301

R79

R81

C53

L9

C41

2

C25

8

R265R272

C27

0R263

R25

6C

240

R260

C252

C26

3C24

4

R28

0

C255

R276

C26

9

R277

C234

C233

C24

3

C26

2

C254

R26

8

T2

L26

Y3

C71C68

R94

C80

R91

Y2

C75R93C

70

C76 U57

C79

U44

U51

U55

R92 C74 R96

R90

C30

0

C28

9

C33

9

C28

6

C301

C30

9

C308

C303 C32

7

C318

C33

5

C307

C29

9

C32

2

R303

C323

C33

4

C333

C28

3

R29

6

C29

8

C29

2

C33

0

C30

4

R29

2

C291

R298C297

R29

0

C31

4

R293

R30

0R29

5

C31

9

C313C58

R284

C282

R29

9

R28

9R

288

R29

4

C278

C280

Y4

U70

C96

TP18

U68

C88

C90

C83

R116

R111

U67

R10

0

R10

1

R102

R10

3 R12

0

R115

C94

C39

9R

329

C39

6

C37

8

C364

C34

9C

352

C34

6

R322

C361

C366

C39

5

C35

0

C39

0

C178

C37

1

R44

C34

4C

340

C17

9

C369

U10

3

C39

3C38

2

R47C44R328

R314C348

U10

4

R30

9

U85

C104C105 C

110

GND

OUTINU88R

134

R135C98 R149

R15

2

R147

TP14

U83

C111

C97

R144

R14

3U

86

U80

R132

U79

C106R137

C41

6

C424

R34

7R

348

C7

C41

5

C42

5C

64

R340

C43

4

R33

5

C40

9 C24

U10

7

R17

8

R17

6

R172

C118R162

C117R159

R165

R168

L21

U94

U95

U96

U93

R181

R183

Q4

R158

C456

C458

C452

C445

R353

R35

6

C45

1

R355

C13

U1

C15J1

61

R188

C21

R17

R21

C28

L6 R22

GN

D

INO

UT

U8

L23

R21

1

C16

6U

97

CR

9C

R10

R22

1

C14

1

U17

U18

U22

U23

R37

C18

6

CR

14C

R13

TP10

U40

L15

U108

U41

R84

R27

1

C24

1

R255

R25

9 R26

9

U50

U56

U54

R29

1

U101CR15

TP11

C91

U66

U74

R10

6

R11

0

L18

C37

7

C35

3C

354

C39

4

R32

5

C38

7

J21

1

U84

U87

U81

C10

8C

109

C99

U82

R14

5

R33

6

C41

0

R33

7

R34

3

1J1

5

R17

3R363

C45

3C

454

C44

8C

449

1

1

1

(LOWER)

(USB)

B

C

(USB)

(MIDDLE)

A(UPPER)

(RJ45)J8

J14

1

J1

Q1

R75R721 E2

U33

TP3 R66

R86

R73

R364R69

R70

R11

C10

R33 R35

C275

C273

C272

C236

C231L16R233

R207C229

C135 C228

R205C134 C226

C225

C175

R228R229

C136 R235

R234

R198R197

C277C232

C268

R252

TP12 U75

U91

TP17

C81

R156

C11

4

C112

R138

R127

R305R315

C337

C355

C397

C408

C406

L28

R349

S1

+

BT1J13

1

Q2

U35

U34

1

J19

TP6

R43

L5

CR

1

U5

Y1

R42

U47

U46 U48U14

U12

R12

U29

U3

R68R34 C35

C196 R312U30

C49 C50

R87

R10

C274

L25R254

R195

C287

C271

C179

R206

R204

C169

C227

C174

C224

R210

R208

C281

R237C16

5

R189

C17

7

C176

R199

R202 R209

R200

R196

R187C279

L22

C84 C115

U64 U76

R153

U92

TP13

U89

C78

U63U59

L20

U78

T3

R139

U61

U72

U73

R126

C398

C338

R316

C356

C336

U10

5

C407

C321

C34

3C

358

C326

C405

C329 C402

C403

R350

U45

U15

U13

U28

U32

1J11

U49

1

J17

C230

U98

B

A

C172

U58 U90

U62

U60

U69

U71

C11

3

U77

U10

6

C45

0

U102 C401

J7

A

B

(UPPER)

(LOWER)

J5 (LO

WER

)B

(UP

PER

)AJ4

(LO

WER

)B

(UP

PER

)AJ6

(UPPER)

(LOWER)

A

B

J2

J12

1

U10

0U

99

A

B

J3

B C E F H I

REAR

1

2

3

4

6

A

M2110055 V1

D G JJ

FRONT

5

GND GND

GND

GND

+3.3V+1.2V

UN

BA

LB

AL

RESET

RF

XMTR

INTE

RFA

CE

CP

LD J

TAG

ARMBOOT

USB

ARM JTAG

DSP

DSP

OUTPUT

PRGM

BOOT

NORM

AUDIO PROC

PS INTERFACE A

CONTROLNAPE83

JTAG

PS INTERFACE B

SER.

EXCITER/

Issue 0.2 2010-12-17 MD-4

Figure MD-4: NAPS43 and /01 PS Distribution PWB

R23 C41

R46C2

C6

C10

F1

L2

R15

R22

R24

R17

R19

R18

R20

R8

C19

L4

TP11

L6

C42

C40

C35

C36

C37

C38

R30

R47

R45

R48

R42

R43

R41

R40

TP20

C54

C48

C51

CR

3

C53

L16

L9 L10

L11

L20

C58

L15

L21

C62

CR

1C

R6

L23

C10

0

C10

6

C12

0

R1

C7

C5

R21 C39

R44

C79

C11

8

TP2

C15

R14

C28R25

R31C34

R28R29

C43R26

TP19R38

C25

TP18C33

TP17

TP15

TP13

TP12

RT4 R55

RT5

C49

C50

R59 R60R62

C59C64C60

R58

R72R69

C67C68

C71

TP23 TP27R80

R85

C81

R82

R81

TP25

C86R83

C85

C104C105

DS3

C108

C117

C115

C112

C110

C1

C3

C8

C14

L1

TP1

C16

R53

TP3

R13

R11

R10

R9

C17

L3

R5

R37

R39

C24

C26

U6

R27

TP14

TP16

R33

R35

R34

C21

C20

C22

U4

C31

C32R10

2

R32

RT2

L5C

29

U3

C55

L17

C52

R49 L8

R51

R50

CR

4

Q3

U7

L13

CR2

TP21

L24

L22

C63

L19

CR

5

C61

U8

R61

L18

R54

R73

C69 U9

C74

C70

C72C73

R68 TP24

TP26

C83

C82

C80C87

C84

R77

R79R78

R84

U11

C99

C10

1

C98

R89

C10

2

RT7

C103

TP28

R94

R92

R96

C10

7

C109

R86

C116

C114

C111

L26

C11

9

C9

R2

DS1

R3

R12

R4

R36

C23

U5

C30

R52

1J4

R71

R70

C88

R97

R98

C18

C27

C13

TP8C12

C11

TP6

R6

TP4R7

C65

TP22 C78

C77

R75

RT6

C75R64R65

R63

C45

C97

C96

C94

C90

R87

C123

R101DS4

R16

TP9

TP10U

2

TP5

TP7

DS2

C66

R95

U10

L14

C47

C46

R74

R76

C56

C57

1 4

2 3

L7

C76R66

C44

L25

C95

C92

C91

C89

U14

U12

U13

R90

C121

C122

TB2

RT1

456

3 2 1

U1

TB3

RT3

D G

SQ2 1

J6

J7

1

1J5 TB4

U15

1

2

3 6

5

4

U16

RT8

2

11

J1

1

2

1

J2

TB1

3

2

15

4

6U17

2

11

J3

B C E F H I K L N O

M2110078 V1

1

2

3

4

A D G J M P

5

GND

MP C

MP B

AC B

AC A

AC C

MP A

+48V

+5V-

A

GND

+15V

+15V

FAIL C

TMP C

FAIL A

FAIL B

TMP B

TMP A

PREAMPCUR

PA 3CUR

PA 2CUR

+5V-B

V CTRL

IPA CUR

GND

4.096V PA 4CUR

PA 1CUR

+5V-B

+5V-A

GND

4 3GND

7A

2IPA V

1

4 2 3 1 4 3 2 1

PS C

PA

VO

LTS

-

CAUTION!

LINE 1 LINE 2/ N/C

56LINE 1

SER.

PS DISTRIBUTION

GND

3 1

PS A

NAPS43

PS B

4 2 PA V

OLT

S +

NEUTRAL

LINE 2/NEUTRAL

+48V IN

AC INPUT

AC OUTPUT

ON THIS ASSEMBLYHIGH VOLTAGE PRESENT

Issue 0.2 2010-12-17 MD-5

Figure MD-5: NAPH03 Splitter PWB

C2

C4

C9

C10 C12

C11

C13

C15

C17 C18

C19

C21

C23

C26 C28

C29

C7

C3

C1 C

5C

6

J7

C8

1

J2

RT3

R1

C16

C14

1

J3

R4

J8

RT4

R2

C20 C

24

C22

C25

C30

C27

C31

C32

1

J6

RT2RT1

1

J1

RT5

1

J4

R3

1

J5

B C E F H I K L N O

1

2

3

4

A

M2110081 V2

D G J M P

5

(U/S)

R

T

SER.U

A B F G H J

U1 IN

K N P Q

S

V

C

RF DRIVE

NAPH03

ED L M

SPLITTER

RF IN

Issue 0.2 2010-12-17 MD-6

Figure MD-6: NAPA28A Pre-Amp/IPA PWB

C4

C6

C16 C18

C20

R3

R1 C14

FC28

L2

C1

C15 C23

C

C3

C5

C2L1

C7

C8

L8

C9

C12

C10 C11

L5 L6

L7

L11

L12

R2

ED

C17

+

C19

L16

C25

L14

C21

C22

C24

B

A

C13Q1

L10

L15C26

L3

C27+

C29 L13

L17

L9

L4

Q2

B C E

1

2

A

M2110064 V1

D

H

SER.

G

PR36 ISS.B

FRONT

211-1121

PRE-AMP/IPANAPA28

Issue 0.2 2010-12-17 MD-7

Figure MD-7: NAPA31 PA PWB

Q1

Issue 0.2 2010-12-17 MD-8

Figure MD-8: NAPH04 Combiner PWB

R1

R2

R4

C2C1

R3

B C E F H I K L N O

1

2

3

4

6

7

8

9

10

A

M2110092 V1

D G J M P

5

11

Z

V

U

T

M

L

AA

X

S

R

C

R5

EE

FF

GG

R7 R8

JJ

NN

W

K

J

U1

P

B

N

F

Q

SER.

A

Y

BB

CC

DD

E

R6

HH KK

R9 R10

MM

LL

D

NAPH04COMBINER

Issue 0.2 2010-12-17 MD-9

Figure MD-9: NAPF13 RF Low Pass Filter PWB

C7

C8

B C E F H I

1

2

3

A

M2110080 V1

D G

AC3 C6

L1 L3

L5

L6

B

NAPF13

C1 C2 C4 C5

SER.

L2 L4

LOW PASS FILTER

Issue 0.2 2010-12-17 MD-10

Figure MD-10: NAPI139 Combiner Interface PWB

C2

R25

TP3

C17

R6

C3R2

C5

R8 R9 R11

C13 R19

U3

C15

TP1

R12

C12C9 U1

R14

R4

C11

C6

R15

R5

R16

R3

R17 C19

L1R18

C18

C14

R20

R22

R21

C1

R7 R24R23

TP2

U2

R13

R1 C4

R26

TP41

J1

9 6 3

A

M2110079 V1

8 7 5 4 2 110

REF

LD

SM

PL

FWD

PWR

SMP

L

PW

RIP

A F

WD

+5V

PW

R

SM

PL

A C

(U/S

)

CO

MB

INE

R

NA

PI1

39

B

D

SE

R.

INTE

RFA

CE

VS2.5 Troubleshooting Manual List of terms

Issue 0.2 2010-12-17 Page 7-1

Section 7: List of terms

This section defines some of the terms that are used in Nautel documentation.

AES-EBU. Audio Engineering Society/European Broadcasting Union (AES/EBU) is the name of a digital audio transfer standard. The AES/EBU digital interface is usually implemented using 3-pin XLR connectors (the same type connector used in professional microphones). One cable carries both left-channel and right-channel audio data to the receiving device.

ARM. Advanced RISC (Reduced Instruction Set Computer) Machine. The specific ARM used in VS transmitters is ARM926, and is used for remote AUI functionality.

AUI. The Advanced User Interface is the web interface that allows for extensive control and monitoring of the transmitter.

Cutback. A reduction in RF output power, caused by the occurrence of multiple shutbacks within a pre-defined period.

Cycling ac power. Turning off (disabling), then turning on (enabling) the ac power source.

DHCP. Dynamic Host Carrier Protocol.

DSP. Digital Signal Processing. Used for transmitter control and signal processing.

EEPROM. Electrically Erasable Programmable Read-Only Memory.

Foldback. A reduction in RF output power, caused by adverse load conditions (high VSWR). No shutbacks or cutbacks have occurred.

HD Radio. HD Radio is another term for In-Band-On-Channel (IBOC) technology. HD Radio is a trademark of iBiquity Digital Corporation.

IBOC. Nautel In-Band-On-Channel technology provides high quality digital audio over existing FM radio channels.

Intermediate Power Amplifier (IPA). Refers to circuitry within the transmitter that amplifies the exciter's RF output to a level sufficient to drive the final RF amplifiers.

Latching alarm. An alarm that, while active, keeps the transmitter in an ‘RF inhibited’ state. This type of alarm (e.g., High SWR Shutdown) require a reset - via the front panel or remote AUI - to attempt to restore transmitter operation.

VS2.5 Troubleshooting Manual List of terms

Page 7-2 Issue 0.2 2010-12-17

LED. Light Emitting Diode (also referred to as lamp).

LUT. Look-Up Table.

MPX. Refers to the multiplexed baseband signal. Also referred to as the composite signal.

Preset. A setting that controls power level, frequency and audio parameters. The VS2.5 allows you to pre-program multiple presets.

PWB. Printed Wiring Board.

Shutback. A complete, but temporary loss of RF output power, caused by any one of a variety of faults, including high VSWR, high reject load power, RF drive failure, or an open external interlock.

Shutdown. A complete and permanent loss of RF output power. Typically follows repeated cutback, foldback or shutback events.

SPI. Serial Peripheral Interface. A synchronous serial data link standard that operates in full duplex mode. Devices communicate in master/slave mode where the master device initiates the data frame. Multiple slave devices are allowed with individual slave select (chip select) lines. Also referred to as a "four wire" serial bus.

Surge protection panel. An electrical panel that protects equipment from electrical surges in the ac power supply, antenna or site ground caused by lightning strikes.

VSWR. Voltage standing wave ratio. This is an expression of the ratio of forward voltage to reverse voltage on the feedline and antenna system. An ideal VSWR of 1:1 provides maximum transmitter-antenna efficiency.

VS2.5

Troubleshooting Manual

Document: VS2.5-TROUBLESHOOT

Issue: 0.2 2010-12-17

Nautel Limited10089 Peggy’s Cove RoadHackett’s Cove, NS Canada B3Z 3J4Phone: +1.902.823.3900 orToll Free: +1.877.6NAUTEL (6628835) (Canada & USA only)Fax: +1.902.823.3183

Nautel Inc. 201 Target Industrial Circle Bangor, Maine USA 04401 Phone: +1.207.947.8200 Fax: +1.207.947.3693

Customer Service (24 hour support) +1.877.628.8353 (Canada & USA only)+1.902.823.5100 (International)

Email: [email protected]: www.nautel.com

© Copyright 2010 NAUTEL. All rights reserved.

mailto:[email protected]


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