80 71,5 Litemod - powersoft.com

Litemod

Service Manual

Keep this manualfor future reference

©2016 Powersoftpowersoft_LiteMod_servman_en_v1.3

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CAUTION

RISK OF ELECTRICK SHOCKDO NOT OPEN

LiteMod | SERVICE MANUAL

WE RECOMMEND THAT ALL SERVICE OPERATIONS ARE CARRIED OUT BY A TECHNICIAN IN THE MANNER DESCRIBED IN THIS GUIDE.

IF NOT EXPLICITLY STATED OTHERWISE, DISCONNECT THE AMPLIFIER FROM THE MAINS BEFORE OPERATING THE AMPLIFIER.

WARNING! INTERNAL CAPACITORS BANK COULD BE CHARGED AND HARMFUL: TAKE CARE OF COMPLETELY DISCHARGE INTERNAL CAPACITORS BANK BEFORE HANDLING THE DEVICE

This technical document aims to be a support guide in repairing and low-voltage testing the LiteMod power amplifier.The troubleshooting approach will help you characterize the kind of fault you incur. A recovery method and the related assembly outline detail is thoroughly explained for the most common faults.The components to be replaced are clearly shown to help their identification. At the end of this guide you can find a detailed list with the description and the respective Powersoft internal reference code of the spare parts.Always use an anti-static wrist band while servicing the amplifier.

Tools:

Data are subject to change without notice.For latest update please refer to the English online version available on www.powersoft-audio.com.

1. Testing Equipment 4

2. Discharging the capacitor’s bank 5

3. Main Board disassemply 6

Assembly Outline 7

4. Troubleshooting 8

PSU 8

AUX Power Supply 9

AMP 10

FAN 11

5. Testing The Module 12

Testing the +/- V Rails 12

Testing the 12Vdc 13

Testing the 5Vdc 14

6. Internal LEDs Checks 15

7. Repair Kit List 15

8. Block Diagram 16

PSU 16

AMP 17

Index:

• Phillips PH 0 screwdriver.• Phillips PH 1 screwdriver.• Small cutter• Tweezers• Function generator or test CD + CD player.• Double trace oscilloscope (it must be disconnected from the

ground) and probes.• Multimeter.• Soldering station.• DC Power Supply• Variac

This documentation contains proprietary information which is the sole property of Powersoft S.p.A.These documents are confidential and reserved and may not be disclosed, reproduced and shared with third persons or used without the express written permission from Powersoft S.p.A.Should the service centre agreement between the two companies be interrupted these documents must be returned to Powersoft S.p.A. Italy or proof of their destruction be provided.

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1. Testing Equipment:

KT000291 DigiModPFC INPUT kit Lamp (min.40W/230V, best 60W/230V)

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2. Discharging the capacitor’s bank:

Before proceeding in operating inside the amplifier, check if the rails are completely discharged: this should happen about 15 minutes after the amplifier has been switched off and disconnected from the mains.

In order to discharge the internal capacitor’s bank connect both ends of a lamp of at least 40 W/230V to the points indicated in (Fig. 2)

(Fig. 2)

(Fig. 1)

When connected to the mains, the LEDs marked in (Fig. 1) glow steady indicating that the module is working correctly. Faults in any of the amp’s stages may be indicated by the malfuncion of one of these LEDs.

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3. Main board disassembly:

Remove the 12 screws highlighted in (Fig. 3)

Carefully remove the Litemod main board from the chassis, remove all 3 silpads as portrayed in (Fig. 4, 5, 6)

(Fig. 3)

(Fig. 5)(Fig. 4) (Fig. 6)

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MAINS FILTER

POWER SUPPLY

AUX

POW

ER S

UPPL

Y

CAPACITORS BANK

AMP STAGE

Assembly Outline:

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4. Troubleshooting:

Evidence of a fault in the power supply stage is a blown main fuse F1 (located close to the main connector). If the fuse is blown, please disassemble the main board from the chassis and check all components as illustrated in the following paragraphs. Change the fuse only if you are sure that the module is worth paying attention (the fuse F1 is a SMD component) to not overheat the board when soldering. (Fig. 7)

(Fig. 7)

(Fig. 8)

PSU

By means of a multimeter se to OHM check the VR1 Varistor as portrayed in (Fig. 8)

By means of a multimeter se to OHM check for short circuit in the PSU Mosfet Q3 by probing on the points indicated in (Fig. 9)

(Fig. 9)

Before operating inside the amplifier please discharge the internal capacitor bank as illustrated in chapter 2.

Module’s Section Condition Action

PSU KO Replace Module

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AUX Power Supply

Evidence of a fault in the AUX Power supply can be found by checking the R53, R54 resistances on the top side of the board indicated in (Fig. 10)

Proceed by checking by means of a multimeter set to Ohm the following components located on the bottom side of the board, indicated in (Fig. 11)• R41, R89• U3A

(Fig. 10)


(Fig. 11)


AUX Power Supply KO Repair with KT000895.R

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AMPBefore operating inside the amplifier please discharge the internal capacitor bank as illustrated in chapter 2.

On the bottom side of the board, please check the following components indicated in (Fig. 12):• L8, L9, L10, L11

The fault might be easily recognisable since those components have the tendency to blow up leaving burn marks that need to be cleaned thoroughly.

(Fig. 12)

If those components aren’t faulty please proceed in checking, with a multimeter set to Ohm, for any short circuit between the points indicated in the following pictures (Fig. 13)

(Fig. 13)


AMP KO Replace Module

Ω

Ω

Ω

Ω

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FAN


Connect the fan to a DC Power Supply and check it’s proper functionality by supplying +12Vdc.

12 Vdc

Connect a Variac to the PL1 connector and supply +80Vac by slowly incrementing the output voltage of the power supply.

Connect the KT000291 test board to the PL1001 connector on the LiteMod Module, and short the ground pin to the TempMon pin.

Verify the output voltage on the Fan’s Connector as portrayed in (Fig. 14), it must be:• 12Vdc ± 10%

(Fig. 14)


FAN KO Replace Module

80Vac

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5. Testing the Module:

(Fig. 15)

Testing the +/- V rails

Connect the KT000291 test board to the PL1001 connector on the LiteMod Module.

By means of a multimeter set to Vdc probe the points indicated in (Fig. 15).The multimeter should read:• ± 4.0Vdc ~ 4.5Vdc


80Vac

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(Fig. 16)

Testing the 12Vdc

By means of a multimeter set to Vdc probe the points indicated in (Fig. 16).The multimeter should read:• 12Vdc ± 10%



80Vac

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(Fig. 17)

Testing the 5Vdc

By means of a multimeter set to Vdc probe the points indicated in (Fig. 17).The multimeter should read:• 5Vdc ± 10%



80Vac

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6. Internal LED Checks:

(Fig. 18)

Highlighted in (Fig. 18) are the status LEDs.The table below illustrates the meaning of each LED.

Channel LED Color Description

CH1

Green Ready | Fully Operational

Red Protect ON

OFF No power | Fault

CH2Green Ready | Fully Operational

Red Protect ON

OFF No power | Fault

7. Repair Kit List:

KT000895.RKIT LITEMOD - PSU

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PSU8. Block Diagram:

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AMP

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IMPORTANT SAFETY ADDENDUMThe aim of this addendum is to describe the safety precautions to be undertaken when servicing any Powersoft amplifier/module.

WE RECOMMEND THAT ALL SERVICE OPERATIONS ARE CARRIED OUT BY A TRAINED TECHNICIAN

IF NOT EXPLICITLY STATED OTHERWISE, DISCONNECT THE AMPLIFIER FROM THE MAINS.

Common signs description:The following is a description of all the warning signs that are commonly implemented throughout our range of products, and those that are mandatory in every service station or workplace.

Label Meaning

General Danger

Danger: High Voltage

Danger: Hot Surface

Danger: Electrostatic Discharge (ESD)

Electrical Grounding Point

Protective Footwear Must be Worn

Observe precaution for handling Electrostatic Discharge sensitive devices

Safety precautions:We recommend to follow all precautions stated by the law while handling sensitive electrical components.

All of the servicing work must be carried in a EPA ESD compliant environment, with the exception of the mere handling of the mechanical parts.

An ESD protected workstation consists in:• Static-Dissipative working surface connected to the EBP (Farnell 1503198)• Wrist-chord and wrist band connected to the EBP (Farnell 1546970)

The technician must wear:• Protective Footwear• ESD EPA clothing (Farnell 1735510)• Static dissipative gloves (Farnell 1503210)

ALWAYS DISCHARGE THE INTERNAL CAPACITORS BANK PRIOR TO SERVICING THE AMPLIFIER

The following pictures portray the minimum ESD-Protected setup, including static dissipative working surface and wristband connected to an Earth Bonding Point connected to the ground.

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Data are subject to change without notice. For latest update please refer to the online version available on www.powersoft-audio.com

Powersoft S.p.A.Via Enrico Conti, 5

50018 Scandicci (FI) Italy

Tel: +39 055 735 0230Fax: +39 055 735 6235

General inquiries: [email protected]: [email protected]

Application & technical support: [email protected] & maintenance: [email protected]

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