AV Receiver With Digital Amplifier Technology STR-DA5000ES, STR-DA3000ES, STR-DA2000ES Diagnostics and T

Training Manual

Course: A-126

A/V Receiver withDigital Amplifier TechnologyModels: STR-DA5000ES

STR-DA3000ESSTR-DA2000ES

Diagnostics and Troubleshooting

STR-DA5000ES

Table of Contents

A-126 Introduction .................................................. 1Digital Amplifier Technology ..........................................................1

1. Overall Block Diagram....................................... 22. Power Supply (Switching Regulator).............. 5Overview ..........................................................................................5Switching Regulator ........................................................................5

Troubleshooting Procedures .........................................................7Testing Switching Regulator Unloaded.........................................9Testing REG Board........................................................................12

3. Analog & Digital Audio System........................ 14Overview .........................................................................................14Overall Audio Block Diagram .......................................................16Troubleshooting Tips Per Board ..................................................18Entering Diagnostics Mode ..........................................................16

4. Video Processing System ............................... 32Overview .........................................................................................32

Overall Video Block .......................................................................32Video Section Troubleshooting ....................................................33Troubleshooting ..............................................................................22Internal Pattern Generator .............................................................27

5. Protection Circuits ............................................. 41Overview .........................................................................................41Excessive Output Amplifier Current (Error 11) ............................41Regulator and Output Amplifier Temperature Protection Circuits(Error 12 and Error 13) ..................................................................42

Output Amplifier DC Detection Circuit (Error 21) .......................43Output Amplifier B+ Detection Circuit (Error 22) ........................44

6. System Control .................................................. 46Overall Block ..................................................................................46

Troubleshooting ..............................................................................47

Appendix A ................................................................ i

1

A-126 - Introduction

A-126 - Introduction

This manual covers troubleshooting procedures for the new ES series AVreceivers. The STR-5000ES, 3000ES and 2000ES are the first Sony AVreceivers to take advantage of the Digital Amplifier technology. Thetroubleshooting methodology used in this manual is in the sequence ofsymptom acknowledgment to board level diagnosis to componentlevel repair. Keeping this sequence in mind as you read through thetraining will result in effective and efficient troubleshooting.

Digital Amplifier TechnologyThe STR-5000ES, 3000ES and 2000ES series AV receivers incorporatestate of the art Digital Amplifier technology on all output channels. AlthoughDigital Amplifiers have been around for decades, it is only recently that thetechnology was possible in consumer home audio component designs.What made it possible are the advancements in Digital Signal Processor(DSP), Large Scale Integration (LSI) and fast Switching Output Transistortechnologies.

Benefits of Digital Amplifier Technology:

• Elimination of any Crossover Distortions through the use ofPWM signals and Low-pass filtering processes.

• Substantial Heat Reduction due to the fact that the outputtransistors are only used for switching; they do not perform anyoutput signal shaping processes (analog output transistors performsignal shaping). All signal shaping is performed by the low-passfilter. This also reduces thermal distortion caused by the heatingand cooling sequences of the output transistors as they are drivenby the audio signal.

The substantial heat reduction also enables a Simpler ChassisDesign. The output transistor heat sinkers are greatly reduced;there is no need for cooling fans; the isolation of the outputtransistors to the rear or side of the chassis is no longer necessary.

Because of the increase in digital media and communications, theconsumer electronics market is moving quickly towards minimization andsleeker audio equipment. These trends indicate that the market is readyfor completely digital audio systems, an audio system that can take adigital input signal all the way to the speaker without ever converting it toanalog. An example of this is Sony’s ES series AV receivers, which arecovered in this manual.

2

1. Overall Block Diagram

Chapter 1 - Overall Block Diagram

The following overall block diagram provides a high-level and simplifiedview of the complete system found in the STR-DA5000ES, 3000ES and2000ES AV Receivers. The diagram is based on the STR-DA5000ESbut can also be applied to the 3000ES and 2000ES with small layoutdifferences. For example, the 3000ES has no 3rd Zone and the 2000EShas no Zones and no Pre-Out.

The block diagram provides the technician with the simplified layout ofthe major audio, video and control signal paths, as well as how they are

routed through the various boards in the system. Whentroubleshooting, use the overall block to diagnose a problem to aparticular area or board, and then use the more detailed diagrams inthis training manual to drill down further in that area or on that board tofind the defective component.

Following Fig.1-1 is a brief description of the function of the PCBs in theoverall block.

3

1. Overall Block Diagram

FIGURE 1-1 - STR-DA500ES OVERALL BLOCK A126.1-1 6/15/04

2CH & MULTI-CHANALOGAUDIOINPUTS

VIDEO S-VIDEOBOARD

AUDIOBOARD

S-VIDEOINPUT

AUDIO

MULTI-CHANALOG

2CH L/R

SURROUND

ANALOG

ANALOGSUB

BOARD

FEED THRU

ANALOG OUTPUTS2ND & 3RD ZONES

DIGITAL

SURROUND

2CH

A/D

TUNER AUDIO

VIDEO

VIDEOINPUTS

VIDEOOUTPUTS

VIDEOBOARD

(RS232) CONTROL

VIDEO 3BOARD

DIGITAL (OPTICAL)AUDIO INPUTS

CISBOARD

TUNER

CO

NTR

OL

FLBOARD

DIGITALBOARD(MAIN &

SUBMICRO #1)

FL D

RIV

E

CO

NTR

OL

THERMISTORBOARD

REGBOARD

SWITCHINGREGULATOR

BOARD

CONTROL DC SUPPLIES

D-AMP(SUB MICRO

#2)2 CH

MULTIAUDIO

MULTIAUDIO

POWER SWBOARD

CO

NT

RO

L

POWER SWSUB BRD.

PRE-OUTBOARD

ANALOGANALOG

SURROUNDOUT

HP BRDHeadphone

SPEAKEROUTPUTS

FUNCTION JOG VOL KEY

FEED THRUFOR PRE-OUT

AUDIO

AUDIO

AUDIO

CONTROL

CONTROL

AUDIO

4

1. Overall Block DiagramSWITCHING REGULATOR BOARD: The Switching Regulator boardprovides the Main and Standby switch-mode power supply circuits. Thevoltages produce by the switching regulator include 33V to 68V for outputstages, +/-12V, -9V. Also located on this board are the AC Relay RY001and the regulator ICs for V+12V and V-9V (as labeled on the schematic).NOTE: This board is replaced as one complete assembly.

AUDIO BOARD: 2 Channel and Multi-Channel input selection are the mainfunctions performed on the Audio board. The processing and output forthe 2nd Zone is also located on this board, along with the 2 Channel analogoutput jacks (including MD/DAT, TAPE, V1 and V2).

ANALOG SUB BOARD: This board contains eight amplifiers for all themulti-channel analog signals before they are applied to the Digital boardto be A/D converted. NOTE: The 2 Channel signals do pass through thisboard, but no processing is performed.

DIGITAL BOARD: The two DSPs located on the digital board perform allprocessing for the various sound fields. The Main and one of the Sub(IC2701) Microprocessors are also located on the digital board. All opticaldigital input jacks are mounted directly to the digital board.

D-AMP BOARD: The D-Amp board is the digital amplifier. On this boardare the PCM/PWM processor ICs, which convert the PCM signal into aPWM signal. The PWM signal drives a digital amplifier IC, booster/switching transistors and associated low-pass filter (all located on the D-Amp board). The resulting analog audio signal then leaves the D-Ampboard to drive the speakers. Also located on this board is the other SubMicroprocessor (IC1800). The Sub Microprocessor performs the directcontrol of all the PCM/PWM processors, the supply voltage to the poweramplifier output stages for volume control, and also the monitoring of theOver-Current and Voltage protection circuits.REG BOARD: As the name implies, on this board are mounted the +/- 5V,+/-10V, +3.3V and +9V regulators. Also located on this board are some ofthe switching circuits for the volume control and the D/A converter, whichfeeds the Pre-Out board.

PRE-OUT BOARD: The Pre-Out board performs the tone/electrical volumeand line amplification for all the Pre-Outs, including the Sub-Woofer output.

VIDEO BOARD: The Video board provides all composite video inputswitching. All composite video input and output jacks are mounted directly

to the video board. This board also performs all video signal processing,producing Y/C signal from a Composite signal and Y/B-Y/R-Y componentsignal from a Y/C signal.

OSD/Video output switching is performed on the Video board. Theswitching relays (RY3304, 3303, 3305, 3306) for selecting ComponentDVD or TV IN, and the switching relays (RY3301, 3302) for selectinginternally produce or external component signals for component outputare all located on the Video board.S-VIDEO BOARD: This board includes the switching ICs for all the S-Video inputs. The S-Video inputs jacks are mounted directly to this board.

VIDEO 3 BOARD: Mounted to this board are the S-Video, Digital Optical,Composite and L/R analog audio front input jacks.

CIS BOARD: The CIS board provides the interface for the Control-S,Trigger Out and IR Remote connections on the rear of the unit. The frontIR sensor also comes into this board; a selector IC switches between frontand rear remote IR sensors.

FL BOARD: This is the display board with fluorescent tube and drivecircuitry. The front IR Sensor is also located on this board.

NOTE: All front panel board control signals feed through the FL board.

FUNCTION BOARD: The rotary Input Selector control is mounted on thisboard.

JOG BOARD: The Bass, Treble, Main Menu, Menu and +/- controls aremounted on this board.

VOL. BOARD: The Master Volume control is mounted on this board.

KEY BOARD: The Music, Movie, A.F.D and 2CH buttons are mounted onthis board.

POWER SW BOARD: The IR Transmitter LEDs and drive transistors arelocated on this board. NOTE: The Power Switch signal does pass throughthis board.

POWER SW SUB BOARD: The Main Power Switch is mounted on thisboard.

THERMISTOR BOARD: This is the small PCB and temperature sensormounted to the regulator’s heat sink on the REG board.TUNER: AM/FM demodulator.

5

2. Power Supply (Switching Regulator)

Chapter 2 - Power Supply (Switching Regulator)

OverviewThis chapter covers the power supply section of the AV receiver, whichconsists of the Switching Regulator and the Regulator board (or REGboard). As the names imply, the Switching Regulator provides all theswitch-mode power supply circuitry and the AC Relay. The REG boardcontains all voltage regulators except for three (+12V, -12V and –9V),which are located on the Switching Regulator board.

Switching RegulatorNOTE: The Power Supply or Switching Regulator board is not componentlevel repairable. The board is replaced as complete assembly.

This section provides a troubleshooting procedure with the following goalsin mind.

To determine if:

1) The Switching Regulator itself has failed.

2) The Switching Regulator is being turned ON.

3) There is an excessive load on the Switching Regulator when inservice.

6


FIGURE 2-1 - POWER SUPPLY OVERALL BLOCK A126.2-1 6/17/04

REG BOARD

NOTE:THIS DIAGRAM ISDIRECTLY FROM THE SM.

V+B

TEMP (P)

V+5V

VOL-DC

VOL-DC AMPIC903

5 7 3 1

DISCHARGEQ909

Q908+

+BSWITCH

Q904

BUFFERQ905, 906

2

3 +

-1

ERROR AMPOC103

DRIVERQ101, 102

+6V REGULATORD203, Q202

VOL-SWVOL-SW

V+12V

V-9W

A+5V+5V

REGULATORIC691

+5VREGULATOR

IC910

+3.3VREGULATOR

IC909

+9VREGULATOR

IC905

+5VREGULATOR

IC904

+B SWITCHQ913

+5V DSP

+3.3V DSP

+5V

+9V 4 3

5

2

4 3

Q911

+B/-B SWITCHIC1913

V POWER

-5VV-5V

REGULATORIC906

-12V

+12V

+3.3VB

+5VB

+3.3VREGULATOR

IC911

+5VREGULATOR

IC912

+10V+10V

REGULATORIC4001

-10VREGULATOR

IC4002-10V

+12VREGULATOR

IC200

D201RECT

-9VREGULATOR

IC202

D202RECT

D210RECT

Q201

JL903

D301RECT

D302, 303RECT

SWITCHINGQ004

T002POWER TRANSFORMER

D013RECT

ISOLATORPC002

-12VREGULATOR

IC201

D405

POW RY

POW CHG

STOP

D401RECT

SHUNTREGULATOR

IC401

D402D021RECT

T003POWER TRANSFORMER

ISOLATORPC005

ISOLATORPC006

ISOLATORPC007

D101RECT

D102

ISOLATORPC002

ISOLATORPC004

ISOLATORPC001

D006

Q003

SWITCHINGQ001, 002

D032

TH002

D002RECT

SWITCHING REGULATORIC002

5

6

2

4

8OUT

VCC

CS

GNS

SWITCHING REGULATORIC001

5

6

2

4

8OUT

VCC

CS

GNSFB

FB

TH002

D002RECT

L002 L001

ACOUTLET

POWER ON/OFFRELAY DRIVER

Q401

RY001

Q912

SWITCHINGREGULATOR

IC003D014, 019

RECT

D015-018RECT

L010

-AC IN

SWITCHINGREGULATOR

BOARD

FROMMAIN MICRO

IC2601

7


Troubleshooting ProceduresDead Unit (Testing Switching Regulator Loaded)

1) Check Standby Power Supply section.

a. Apply AC Power to AC IN connector (Reference Fig. 2-1).

b. Locate CN8 on Switching Regulator board (Reference Fig.A-5, Appendix A) .

c. Check for the following voltages:

i. CN8/pin3 +12V

d. If the voltages are missing or incorrect, the SwitchingRegulator is possibly defective. Go to “Testing SwitchingRegulator Unloaded” (Page 9) in the next section to

determine if the Regulator is defective or if there is anexcessive loading problem.

e. If CN8 voltage is correct, check the voltage output ofregulators IC912 and IC911 on the REG Board (ReferenceFig. 2-2)

8


POWER CHG

FIGURE 2-2 - POWER SUPPLY/REGULATORS A126.2-2 6/17/04

SWITCHINGREG. BOARD

8

7

6

5

3

1

P-RELAY

STOP-12V+12VB+12V

CN908

CN8

POWER CHANGE Q914INVERTER

POWER RELAY

STOP

V POWER TO Q912

1

2

3

4

5

7

8

9

11

IC912+5V

1 3IC911+3.3V1 3

+5VB

+3.3VB

IC909+3.3V

1 3+3.3VDSP

IC910+5V1 3 +5VDSP

CN909

TODIGITALBOARDCN2701

REG. BOARD

4CN3 RY +12VCN1852 FRONT A/B

RELAY

TORY1680

&RY1690

1CN7+12V

CN851TO ZONETRIGGERCIRCUIT

D-AMPBOARD

CIS BOARD

8

7

6

5

3

1

2

4

2

4

DSP GROUND

FL GROUND

1

2 5GRND

1

2 2

+12V

+12V

+12V

2.6V

4V0.156V

GRND

9


FIGURE 2-3 - AC JUMPER CABLEA126.2-3 6/2/04

ZIP-CORD

AC TWO-PRONG PLUGS

Testing Switching Regulator UnloadedTest Standby Power Supply Section

1) Completely unload the Switching Regulator. Disconnect the cablesto the following connectors on the Switching Regulator board:

CN1, CN2, CN3, CN4, CN5, CN7, CN8 (Reference Fig. A-5,Appendix A)

2) Apply AC Power to AC IN connector (Reference Fig. 2-1).

3) Locate CN8 on Switching Regulator board (Reference Fig. A-5,Appendix A) .

4) Connect Chassis Ground to CN8/pin 2.

5) Check for the following voltages:

a. CN8/pin3 +12V

6) If the voltages are missing or incorrect, the Switching Regulator isdefective

7) If the voltages are correct (unloaded), check for shorted conditionon the REG board at CN8 connector. This causes the voltages tosag when connected. Alternatively, the Switching Regulator circuitis defective and cannot handle the normal load. In this situation,the complete assembly must be replaced.

Test Main Power Supply Section1) The Switching Regulator should be completely unloaded asdescribed in Step 1 of the previous test procedure.

2) Construct a AC jumper cable with a zip cord and two male twoprong plugs at either end (Reference Fig. 2-3)

10

2. Power Supply (Switching Regulator)3) Insert one end of the AC Jumper Cable into the AC Outlet connectoron the rear of the AV Receiver.

!!!!Caution!!!! Never plug one end of the AC Jumper Cable intothe AC power source first and leave other end unconnected.Always connect to AV Receiver first and then connect to theAC power source.

4) Connect other end of AC Jumper Cable to AC power source.5) Steps 1 and 2 are performed to bypass the AC Relay RY001 on theSwitching Regulator board. NOTE: The AC Relay cannot be bypassedwith the Switching Regulator board connected due to timing problemswith system control. The AC relay will just pulse ON and OFF.6) Connect chassis ground to the following connector/pin and checkto the voltages on the associated connector pins (Reference Fig. 2-4):

a. CN1/pin 1 (Grnd)i. CN1/pin 2 (33V)

b. CN2/pin 2 (Grnd)i. CN2/pin 1 (+12V)

ii.CN2/pin 3 (-9V)c. CN4/pin 2 (Grnd)

i. CN4/pin 1 (+12V)ii.CN4/pin 3 (-12V)

d. CN5/pin 2 (Grnd)i. CN5/pin 1 (-12V)ii.CN5/pin 3 (+12V)iii. CN5/pin 5 (-12V)

7) If the voltages are correct (unloaded), check for shorted conditionon the REG board at CN8 connector that is causing the voltages tosag when connected. Alternatively, the Switching Regulator circuit isdefective and can handle the normal load. In this situation, the completeassembly must be replaced.

11


FIGURE 2-4 - POWER SUPPLY/REGULATOR DIAGRAM A126.2-4 6/18/04

SWITCHINGREGULATOR BRD.

CN5

RY -12V+12V

-12V

CN4001

+12V 1

CN2

AC STOPVOL - SW

-9V

CN9015

4

3

CN4

+12 V-12V

1

3

CN906

CN12

V+BCN905

CN6 NOT USED ON 3000(CHECK 2000, 5000)

CN8 GO TO FIG. 2-2

CN3 GO TO FIG. 2-2

CN7 GO TO FIG. 2-2

IC4001+10V

1 2

3

IC4002-10V2 1

3 1

3

5

CN4002

TOAUDIOBOARDCNP605

+

-

SCREWTERMINALS

+

Q904

C913

R914+C910

Q905

R914

R917Q906

IC9031 5R918R920

R921Q908

Q909 4

3

1

2

5

2

1 TEMP5V

THERMISTORBOARD

2

1

R907 CN910

CN902

R908

TO D-AMPBOARDCN1853

IC905+9V

1

3

IC906-5V

2 3

IC904+5V

1

3

IC913-5V

6 1

3 4

5 2

-5V

+9V

Q913-5V SW

Q911

D901

D902+9V SW

Q9124

CN909

4

3

1

-5V

+9V

+12V

TOVIDEOBOARDCN3803

CN907

(V POWER)FROM

DIGITALBOARDCN2701

REG BOARD

1

3

5

2

3

5

1

2

2

11

5

4

3

1

2 2

1

3

2 2

+12V+10V

33V TO 68V(-0db) (-20db) (+0db)6.7V / 33V / 68V

38,8V (-0db)START INCREASE (-20db)68V (+0db)

-10V

VOL DC

AC-STUPVOL-SW

(-20db) (+10db) 0.5V 5V

+12V

+9V

+5V

-12V+5V

TO D-AMPBOARD

(-0db) (110db) 1V 11V

TOD-AMPBRD

GRND

GRND

GRND

GRND

12


Testing REG BoardWhen troubleshooting the regulators on the REG board, keep in mind thatsome regulator output feeds other regulator inputs, and that all regulatorsare not ON all the time. Some regulators are switched ON only for specificfunctions (e.g. Video Output function). Voltages to the Video board CN3803are present only when the video outputs are selected.

The following is a description of the configuration of the regulators andhow to confirm proper operation.

Regulator ConfigurationReference Figures 2-2 and 2-4 for the following descriptions:

1) IC912 (+5V) and IC911 (+3.3V) are the Standby Voltage regulatorsand they will be ON constantly. Both regulator inputs come fromthe Switching Regulator on separate outputs.

2) IC909 (+3.3V) and IC910 (+5V) are the DSP’s voltage source. Theyboth are supplied +12V directly from the Switching Regulator.These regulators are switched ON with the AC Relay.

3) IC4001 (+10V) and IC4002 (-10V) are the Audio board voltagesource. They are supplied +12V and -12V respectively directlyfrom the Switching Regulator. These regulators are switched ONwith the AC Relay.

4) IC905 (+9V), IC906 (-5V) and IC904 (+5V) are the Video boardvoltage source. Both IC905 and IC906 inputs come directly fromthe Switching Regulator on separate outputs. IC904 receives itsinput from IC905’s output. Notice that although the regulators areON constantly, their outputs are switched going to CN907 throughIC913 or Q913. These outputs are applied to CN907 only whenVideo 1, 2 or 3 functions are selected. Q912 and Q911 provide theswitching signals when the VPOWER signal is supply from themicroprocessor.

Switching Circuit for Audio-Output Circuit Voltage Source (Mid-Range Volume Control)

Reference Figure 2-4The volume control for the STA-DA5000, 3000 and 2000 is performed inthree stages.

The first volume stage range is –0db to –30db (ref. meter on display).The control of the volume is achieved in this range by varying the outputpulse width of the separate PCM/PWM processors.

The second volume stage range (or Mid-Range) is –30db to –10db.The control of the volume is achieved in this range by varying the source(or rail) voltage to the audio output stages, the Digital Amp and MOSFETswitching transistors to be exact.

The third volume stage range is –10db to +10db. The control of thevolume is achieved in this range by further varying the output pulse widthoutput of the separate PCM/PWM processors.

The first and third volume stages are accomplished through the MainVolume Control – Main Micro – PCM/PWN serial data communication.

The second volume stage (mid-range) is accomplished through the MainVolume Control – Main Micro – Control Circuit (reference Figure 2-4).The Control Circuit consists of IC903, Q906, Q908, Q909, Q905 and Q904.Q906, Q905, Q904 and C913 are used to increase the volume.

Q908, Q909 and C913 are used to decrease the volume.

13

2. Power Supply (Switching Regulator)Testing the Volume Control Circuit:Reference Fig. 2-4.

1) Check overall operation. Check Q904 output (drain) voltage asthe volume is varied. The voltage should track the “db” level (viewthe db meter on the display) as follows: If the voltage is notreasonably tracking the db level, proceed to the next step.

a. 6.7V at –0db

b. 33V at –20db

c. 68V at +0db

d. 68V for remain volume increase

2) Check control voltages at IC903. The input to IC903/pin 5 (VOL-DC) is the mid-range volume control signal from the Main Microand should track as follows:

a. Increase linearly from 0.5V to 5V starting at –20db to +10db.

b. The output IC903/pin 1 increases linearly from 1V to 11V.

3) Decreasing volume check. Probe the base of Q908 and begindecreasing the volume. The base voltage should pulse low whichwill turn OFF Q908 and turn ON Q909. When Q909 is turned ON,the voltage on C913 is decreased, which decreases the supplyvoltage to the audio output stages. This decreases the volume.

14

3. Analog & Digital Audio System

Chapter 3 - Analog & Digital Audio System

OverviewThe following sections will cover the 2-Channel, Multi-Channel andDigital-Channel audio processes. Clear and simplified signal pathdiagrams are presented for easier signal tracing for all three audio channelstypes. First, an overall block including all channels is presented, theneach separate channel type is considered in more detail in succeedingsections and diagrams. A board level diagnosis flow-chart accompanieseach section.

The troubleshooting process presented in this chapter is laid out to firstuse the flow-charts and overall block diagram to diagnose the problem toboard level, and then proceed to the specific detailed board diagram totroubleshoot to component level. The main troubleshooting tools are theaudio inputs and outputs.

15


IC1401PCM/PWM

IC1950DIGITALFILTER

DATA7.1

4CH

IC2502BUFFER

DATA7.1

4CH

IC2426GPR

DATA7.14CH

IC2251DSP

IC2201DSP

(NOISEGEN.)

LCH IC321AMP

IC322AMP

IC326SWITCH

IC327BUFFER

IC341INPUT

SELECT

LCH RY641IC643LINEAMP

IC642TONE/VOL

IC641BUFFER

FIGURE 3-1 - 2CH, MULTI-CH & DIGITAL SIGNAL PATH OVERALL BLOCK A126.3-1 6/18/04

PHONO IC301(EQ)

CD/SACD IC611

MD/DAT IC613

TAPE IN IC615

TV/SAT IC616

DVD IC617

VIDEO 2 IC619

VIDEO 1 IC621

IC401 INPUT SELECT (LCH)

MD/DAT OUT

TAPE OUT

VIDEO 2 OUT

VIDEO 1 OUT

IC612

IC614

IC618

IC620

BUFFERS

J605

J606

J607

J608

BUFFERS

2CHINPUTS

2CH OUT(LCH)

ZONE 2J609

AUDIO BOARD

2CH OUT(LCH)

DIGITAL BOARD2CH IC3010

A/D (PCM)

DATA7.1

4CH

TO REGBRD (D/A)AND THEN

PRE-OUT BRDDIGITALAUDIO INPUTS

IC2204CONT. FROM

FIG. 3-7

IC1906BUFFER

IC1511DED

IC1521DED

Q1651

Q1671

Q0330

Q1681

LEFT/A SPK +

LEFT/A SPK -

IC1531DIG.AMPS

IC1541DIG.AMPS

IC111ANALOG SUB BOARD

IC1910 IC2501IC2401GPR

IC2012A/D

D-AMP BOARD

ANALOG AUDIOOUTPUTS

MULTI-CHANNEL1 & 2

2CH

MULTI-CHANNEL1 & 2

16


Overall Audio Block DiagramNOTE: Only Left (L) audio signal path is shown for simplicity in the diagram.All other signal paths follow a similar route with only a change in IC pinnumbers.

The overall block diagram in Figure 3-1 gives a simplified view of the 2-Channel, Multi-Channel and Digital-Channel audio signal paths. NOTE:The overall systems block diagram (Ref. Fig. 1-1) gives an even simplerview and can be used to troubleshoot this section to board level.

The main thing to notice in Figure 3-1 is how the three input sources (2-Ch, Multi and Digital) divide the block into three distinct sections.

Reference Figure 1-1

1) Signals from the 2-Channel inputs will test the complete audioprocessing path from inputs to speaker outputs.

2) Signals from the Multi-Channel inputs bypass the 2-Channelselector and the DSP processing circuits. The signals are thenapplied directly to the PCM/PWM processor and speaker drivecircuits.

3) The Digital (or Optical) inputs are applied directly to the firstDSP IC and completely bypasses the Audio board.

These are key ideas to keep in mind when troubleshooting. They providethe means of diagnosing a problem quickly to a particular section or board.

The following two flow-charts (Flow Chart 1 and 2) are step-by-step boardlevel troubleshooting tools derived from the above three “divide andconquer” concepts. Notice that at the point where the flow-chart predictsa defective board, it then points to a particular figure for detailed componentlevel troubleshooting of the suspect defective board.

Flow Chart 1 is based on using the 2-Channel inputs as the initial signalsource and then midway through it uses the Digital inputs to further dividethe system. NOTE: There is not separate flow-chart for the Digital inputsignal path. The 2-Channel (Flow Chart 1) flow-chart can be used fromthe mid-point on to troubleshoot the digital path.

Flow Chart 2 in based on using the Multi-Channel inputs as the initialsignal source and then towards the end, the 2-Channel inputs are used tofurther divide and troubleshoot the path.These troubleshooting flow-charts are obviously especially good for noaudio output defects, but they can also be very effective in tracking downat what point in the circuit a audio distortion is being introduced. Onceagain, the “divide and conquer” method is used to apply various inputsand bypass circuits to determine if the distortion is still present.

17


DEFECT OND-AMP BRD.

DEFECTIVEIC2010 ON

DIGITAL BRD.

YES

CHECK AUDIO ONCNP601/PINS 1 & 3CN621/PINS 5 & 3

(ANALOG SUB. BRD.)

DEFECT ONAUDIO BOARD

NOGO TO FIGS 3-2THRU 3-4 FORCOMPONENTLEVEL DETAIL

FLOWCHART 3-1 - FLOWCHART FOR AUDIO (2CH) PATH BOARD LEVEL DIAGNOSTICS

*UNIT POWERS UP WITH NOAUDIO

NOTE:*INPUT AUDIO SIGNALINTO SEPARATEMULTI-CH INPUTS TOTEST SEPARATECHANNELS ( ORSPEAKERS).*MULTI--CH AUDIOGOES THROUGH THEAMPLIFIERS ONANALOG SUB. BOARD.

NO OR DISTORTED2CH AUDIO OUTPUT

SPEAKERS

INPUT 2CH AUDIO(E.G. CD/SACD)

YES

YES

Go to Appendix A forBoard & Connector

Locations

Check SpeakerAudio Output

(Present?)

INPUT AUDIOAT DIGITAL (OPTICAL)

INPUTS (E.G., CD/SACD)

NOTE: THE ANALOG SUB BRD. IS ONLY AFEEDTHROUGH FOR 2CH AUDIO

GO TO FIG. 3-6FOR COMPONENTLEVEL DETAIL

NO

Check Pre-OutAudio Output

(Present?)

DEFECT ONDIGITAL OR

PRE-OUT BRD.OR REG.

NOCHECK ANALOGPRE-OUT AUDIO

INPURTS. REF. FIG.3-8 (PRESENT?)

DEFECTON

PRE-OUTBRD.

GO TO FIG. 3-8FOR COMPOUND

DETAILDEFECT OND-AMP BRD.

GO TO FIGS. 3-9 & 3-10FOR COMPONENT DETAIL

YESNO

YES

Check SpeakerAudio

(Present?)

NO DEFECT ONREG. BRD.

GO TO FIG. 3-8FOR COMPONENT

DETAIL

YES

Go to Appendix A forBoard & Connector

Locations

2 CHANNEL TEST FLOWCHART

DEFECT ONANALOG SUB

BOARD

NOGO TO FIG. 3-6COMPONENTLEVEL DETAIL

CHECK AUDIO ONCNP620/CNP622 INPUT

ANALOG SUB BRD.(PRESENT?)

DEFECT ONAUDIO BOARD

NO GO TO FIG. 3-5COMPONENTLEVEL DETAIL

FLOWCHART 3-2 - FLOWCHART FOR MULTI-CH AUDIO PATH BOARD LEVEL DIAGNOSTICS

NOTE: HEADPHONE OUTPUT CAN BEUSED TO CHECK THE OUTPUT OFIC1401 (L/R) PCM/PWM PROCESSORAND BYPASS OUTPUT CIRCUITAFTER IC1401 INCLUDING THESWITCHING DRIVE MOSFETS FORTHE L&R SPEAKER OUTPUTS.REF. FIGs. 3-9 & 3-10

NO/DISTOREDAUDIO OUTPUT

INPUT MULTI 1 OR 2AUDIO SIGNALS

YES

CHECK AUDIO ONCNP601 & CNP602

OUTPUT ANALOG SUBBOARD

(PRESENT?)

YES

INPUT A 2CH SIGNAL.CHECK SPEAKER AUDIO.

(PRESENT?)

DEFECT ONDIGITALBOARD

YES

DEFECT OND-AMP BRD.

GO TO FIGS. 3-9 & 3-10COMPONENT LEVEL

DETAIL

NO

REF.FIG. 3-6

REF.FIG. 3-6

GO TO FIG. 3-5COMPONENTLEVEL DETAIL

MULTI-CHANNEL TEST FLOWCHART

18


Troubleshooting Tips Per BoardAudio BoardReference Fig. 3-1 (Overall Block)

Troubleshooting the Audio board is just a matter of analog audio signaltracing. The Audio board can be further divided to isolate a defect bymonitoring the analog outputs (e.g. MD/DAT) and Zone 2.

Apply a signal to any 2-Channel input.

1) Check analog outputs (e.g. MD/DAT).

a. No audio. Defect at Input/Output Buffers or Switching IC501and/or IC401 (Ref. Fig. 3-2).

b. Audio Present. Go to next step.

2) Check Zone 2 output.

a. No audio. Defect in Zone 2 signal path from IC641 to RY641(Ref. Fig.3-3).

b. Audio Present. Go to next step.

3) Check audio signal path from IC341 to IC321. This is the audiosignal path for the Pre-Out and Speaker outputs (Ref. Fig. 3-4)

19


FIGURE 3-2 - 2CH SIGNAL PATH A126.3-2 6/7/04

IC501INPUT SELECT (R)

2

3

40

5

38

7

36

8

55

9

34

PHONO

CD/SACD IN

MD/DAT IN

TAPE IN

TV/SAT IN

DVD IN

4

6

10

12

15

16

28

MD/DAT OUT

TAPE OUT

VIDEO 2 OUT

VIDEO 1 OUT

L COMOUT

11 32 13 30 29

VIDEO 1IN

VIDEO 1IN TUNER IN

IC401INPUT SELECT (L)

2

3

40

5

38

7

36

8

55

9

34

PHONO

CD/DVD

MD/DAT IN

TAPE IN

TV/SAT IN

DVD IN

4

6

10

12

15

16

27

28

MD/DAT OUT

TAPE OUT

VIDEO 2 OUT

VIDEO 1 OUT

L COMOUT

13 30 14 29

VIDEO 1IN

TUNERINVIDEO

AUDIOIN

IC6215

3

L

R1

7

VIDEO 2AUDIO

INIC619

5

3

L

R

1

7

DVDAUDIO

INIC617

5

3

L

R

1

7

TV/SATAUDIO

INIC616

5

3

L

R 7

1

TAPEIN

IC6155

3

L

R

1

7

MD/DATIN

IC6135

3

L

R

1

7

PHONOIN

IC301(EQ)

3

5

L

R

7

1

CD/SACDIN

IC6115

3

L

R

1

7

11

32

VIDEO 2IN

TO IC612

TO IC614

TO IC618

TO IC620

TO IC641(GO TOFIG. 3-3)

TO IC341(GO TOFIG. 3-4)

TO IC612

TO IC614

TO IC618

L

R

L

R

R

R

R

L

R

L

R

L

R L

L

L

L

L

L

L

L

R COM OUT

R COM OUT

R

R

R

R

CN617 CNP920 TUNER

TUNER RTUNER R

3

1

7

9

AUDIO BRD.ANALOG

SUB BRD.

CNP601 CN2052

10

8

CN20519

11

1

3

R

L

DIGITALBOARD

L COMOUT

27

14

TO IC641GO TOFIG. 3-3


L

R

L

R

L

R

20


+C442

+C542

IC642VOL/TONE

CONTINUEDFROM

FIG. 3-2

FIGURE 3-3 - 2 CH SIGNAL PATH (ZONE 2 OUTPUT) A126.3-3 6/7/04

IC641BUFFER

5

3

7

1

L

R

FROMIC401/PIN 15

FROMIC501/PIN 15

20

9

25

23

24

5

6

4

IC643AMP

5

6

2

3

C543

C443+

+

INFB

FB

OUTIN

IN OUT

FB

7

1

L OUT

R OUT

RY641

L

R

J609ZONE 2

OUT

AUDIO BOARD

FBIN

21


+C122

+C222

+C126

+C226

+C127

+C227

CONTINUEDFROM

FIG. 3-3

FIGURE 3-4 - 2 CH SIGNAL PATH A126.3-4 6/7/04

L

R

FROMIC401/27

FROMIC501/27

IC327BUFFER

5

3

7

1

IN

IN

L OUT

R OUT

IC341INPUT

SELECT

40

3

37

6

IN

IN

L OUT

R OUT

IC326VOL

37

6

41

2

IN

IN

L OUT

R OUT

IC322AMP

2

6

1

7

IN

IN

L OUT

R OUT

AUDIO BOARD

IC321AMP

2

6

1

7

IN

IN

L OUT

R OUT

L

R

5

7

5

3

CNP617 CNP620

ANALOG SUBBOARD

1

3

4

6

CNP601 CNP2052

DIGITALBOARD

LR


22

3. Analog & Digital Audio SystemAnalog Sub BoardReference Fig. 3-5Troubleshooting the Analog Sub board is just a matter of analog audiosignal tracing. The 2-Channel audio signal passes through the AnalogSub board with no processing, while each Multi-Channel signal is appliedto an amplifier on the Analog Sub board.

This configuration can be used to quickly troubleshoot this board for a NoAudio symptom.

Assuming that the Audio board has been confirmed good per thetroubleshooting tips in the previous section, if there is speaker audio witha 2-Channel signal, but not with one of the Multi-Channel signal outputsthen that would indicate a failed amplifier on the Analog Sub board (Ref.Fig. 3-5). Each signal path of the Multi-Channel input can be checkedusing the internal Noise Generator.

23


IC341INPUT

SELECT

4

35

8

L

R

SLSR

6

IC2401GPR

20

22

24

37

J601J602J603

MULTI.CH.INPUT 1

7.1

FIGURE 3-5 - MULTI-CH INPUT SIGNAL PATH (AUDIO/ANALOG SUB/DIGITAL BOARDS) A126.3-5 6/16/04

39

31BL

12BR

27C

33

21

19

16W

5

34

9

LR

SLSR

J604MULTI.CH.

INPUT 25.1

38

26C

17W

IC327BUFFER

5

3

7

1

L

RIC326

SELECT

37

6

30

31

IC312AMP

3

5 7

1C

W

L

R

29

SL

SR

SBL

SBR

AUDIO BOARD

10

14

IC311BUFFER

3

5 7

1

IC313BUFFER

3

5 7

1

C

W

SL

SR

SBL

SBR

IC11161

7

IC21167

1L

R33

10

+L-L

+R-R

+C-C

+W-W

+SL-SL

+SR-SR

+SBL-SBL

+SBR-SBR

19

16

15

14

13

DSD L 2

3DSD R

4DSD C

5DSD W

5DSD SL

5DSD SR

5DSD SBL

5DSD SBR

DSD LDSD RDSD CDSD WDSD SLDSD SRDSD SBLDSD SBR

IC2501BUFFER

13

11

12

14

15

16

17

18

9

8

7

6

5

4

3

2

DSD LDSD RDSD CDSD WDSD SLDSD SRDSD SBLDSD SBRDSD SBRDSD SBLDSD SRDSD SLDSD WDSD CDSD RDSD L

ANALOGSUB BOARD

TO D-AMPBOARDIC1910GO TOFIG. 3-9

TO REG BOARDTHEN PRE-OUT

IC941GO TOFIG. 3-8

DIGITAL BOARD

IC16161

7

IC26161

7

IC14161

7

IC24161

7

IC18161

7

IC28161

7

CN619 CN6221 4

2 3

6 2

7 1

CNP618 CNP621

3 2

4 1

CNP619 CNP622

8 2

9 1

CNP617 CNP620

IC2012A/D

(DSD)

17

16

4

5

DSD L

DSD R

12

11

IC2014A/D

(DSD)

17

16

4

2

DSD C

DSD W

12

11

IC2013A/D

(DSD)

17

16

4

2

DSD SL

DSD SR

12

11

IC2015A/D

(DSD)

17

16

4

2

DSD SBL

DSD SBR

12

11

DIGITAL BOARD

6 9

5 8

7 10

8 11

CNP601 CN2052

7 7

6 6

8 8

9 9

CNP602 CN2053

2 2

3 3

4 4

5 5

11 11

10 10

12 12

13 13

24

3. Analog & Digital Audio SystemDigital Board

Reference Figure 3-6 and 3-7Internal Pink/White Noise Generator: The internal noise generator islocated in the first DSP IC2201. This generator can be used to troubleshootthe circuits on the Digital board.

Noise signals are sent sequentially to all the speaker outputs or to a fixedspeaker output depend on the menu setting. The signal path will befrom IC2201 DSP to the Speaker Outputs

The noise generator will divide the system at the point where the Digital(Optical) input is applied to the DSP IC2201. The noise generator can beused to determine if a Digital Optical Input or the DSP section is defective.If a signal is applied to the Digital Optical Input and no speaker audio ispresent, but audio is present when the Noise Generator is activated, thenthis would indicate a defect in the Digital Optical Input circuit (Ref. Fig. 3-7), which consists of the following ICs:

Digital Optical Input Circuit:

IC2001 thru IC2004 and IC2006

Coax Input

IC2005

IC2007

IC2121

IC2204

If the noise is not present a the speaker outputs, then this would indicatea defect in one of the DSP IC2201 or IC2251 and the succeeding circuit ofIC2426 and IC2502 (Ref. Fig. 3-6).

25


IC2251DSPPCMFROM

IC321CONT.FROM

FIG. 3-4CN2052

FIGURE 3-6 - 2 CH SIGNAL PATH A126.3-6 6/7/04

L

R

IC2201DSP

18

30

IN

OPTICALDIGITALIN

OUT

IC2010A/DPCM

1

2

12IN

IN

OUT

DIGITAL BOARD

FROMIC2121CONT.FROM

FIG. 3-8

OUT

OUT

OUT

27

28

35

39

IN

IN

OUT

OUT

OUT

OUT

IN

IN

DATA L/R23

24

25

26

DATA C/W

DATA SL/SR

DATA SBL/SBR

L/R60

61

25

26

C/W

SL/SR

SBL/SBR

IC2426GPR35

36

37

38

IN

IN

OUT

OUT

OUT

OUT

IN

IN

L/R22

21

20

19

C/W

SL/SR

SBL/SBR

IC2502BUFFER

9

8

7

6

IN

IN

OUT

OUT

OUT

OUT

IN

IN

11

12

13

14

9 12 144 139

13 12 11 10

23 24 25 26

D-AMP BOARD SBL/SBRSL/SRC/WL/R

SBL/SBRSL/SRC/WL/R

TOIC1900GO TOFIG. 3-9

TOIC9400GO TOFIG. 3-8

22 23 24 25

4 3 2 1

REG BOARD

X220113.5 MHX

X225113.5 MHX CN2006

CN1901

CN1902

CN911

26


FIGURE 3-7 - DIGITAL SIGNAL INPUT DIAGRAM A126.3-7 6/15/04

MO/DATINPUT

IC2007BUFFER

3 6IC2001

OPTICALOUT

3

IC2004OPTICAL

IN1

IC2003OPTICAL

IN1

DVDINPUT

TV/SATINPUT

IC2002OPTICAL

IN1

IC2000OPTICAL

IN1CD/SACD

INPUT

MD/DATINPUT

IC2005 INPUT

SELECT

1

3

2

4

12

14

15

IN

IN

IN

IN

IN

IN

IN

5OUT IC2007SWITCH

72IC2121

I/FRECEIVER

16DSD

3IC2204D-0UT

SWITCH613

DSDDIGITALAUDIOGO TOFIG. 3-6

COAXIALINPUTS

DVD

CD/SACD

IC2006WAVE

SHAPER69

IC2006WAVE

SHAPER213

IC1006OPTICAL

IN

VIDEO 3INPUT

J2000

27


IC940BUFFER

2

9

8

7

DATA LR

DATA CW

DATA SL/SRDATASBL/SBR

DSDW

11

DSDW

CW

SL/SR

SBL/SBR

IC941BUFFER

9

7

6

5

DSD L

DSD R

DSD C

DSD W

DSDW

12

L/R

DSD L

DSD R

DSD C

8

DSD SL

4DSD SR

3DSD SBL

2DSD SBR

13

14

11

12

13

18

DSD SL

DSD SR

DSD SBL

DSD SBR

15

16

17

18

FROMIC2502DIGITALBOARD


IC2801D/A

43

48

46

49

47

40

41

42

38

39

44

45

10

9

11

29

28

31

L

R

SL12

SR

SBL

SBR

C

W

IC937LOW PASS

FILTER

5

3

7

IC936LOW PASS

FILTER

5

3

7

1

IC935LOW PASS

FILTER

5

3

7

1

IC934LOW PASS

FILTER

5

3

7

1

IC2912TONE/

VOLUME

9

20

30

5

23

6

24

IC2862TONE/

VOLUME

9

20

5

23

6

24

IC2812TONE/

VOLUME

9

20

5

23

6

24

IC2962TONE/

VOLUME

9

20 6 IC2963LINEAMP

1

7

2

5

3

6

IC2913LINEAMP

1

7

2

5

3

6

IC2863LINEAMP

1

7

2

5

3

6

IC2813LINEAMP

1

7

2

5

3

6

LR

SL

SR

SBL

SBR

C

W

REG BOARD PRE-OUT BOARD

L

R

SL

SR

SBL

SBR

C

W

J2957

J2915

J2875

J2815

SUB-WOOFEROUTPUT FOR

ALL SURROUNDMODES

FIGURE 3-8 - 2CH & MULTI-CH SIGNAL PATH (REG/PRE-OUT BOARDS)

1

5

23

24

11 11

13 13

7 7

9 9

3 3

5 5

1 1

CN913 CN2903

CN914 CN2904

CONT.FROM

FIG. 3-5

CONT.FROM

FIG. 3-5

A126.3-8 6/7/04

6 6

REG and PRE-OUT BoardsReference Figure 3-8The audio processing circuits on the REG board convert digital Multi-Channel information from the Digital board to analog signals, which thenare applied to the PRE-OUT board. The procedure for troubleshooting

the REG and PRE-OUT boards is described towards the end of Flow-Chart 3-1. Troubleshooting the PRE-OUT board and the output of theREG board is just a matter of analog audio signal tracing.

28

3. Analog & Digital Audio SystemD-Amp BoardReference Figures 3-9 and 3-10The digital audio circuits on the D-AMP board perform the PCM/PWMconversion and the Digital Power amplification processes. The process iscompletely digital right up to the speakers. The PCM audio signal (Ref.Waveform 3-1) from the Digital board is first converted to a comparablePWM signal (Ref. Waveform 3-2). The PCM/PWM processors produce adifferential (High and Low signal) to eliminate distortion. The differentialsignals are finally used to drive the Output Switching MOSFETs.

Power amplification is accomplished through two methods: 1) by varyingthe pulse-width of the PWM signal; and 2) by varying the supply voltage tothe Digital Amplifier ICs and the Output Switching MOSFET transistors.This process is described in more detail in Chapter 2 (Power Supply) inthe “Switching Circuit for Audio-Output Circuit Voltage Source (Mid-RangeVolume Control)” section.

Immediately after the Output Switching MOSFET, the PWM signal is appliedto a low-pass filter. The filter removes the high frequency component andwhat’s left is an analog audio signal to drive the speakers (Ref. Waveform3-7).

The Headphone outputs come from IC1401/pins 24, 18, 10 and 4 (Ref.Fig. 3-9 and 3-10). Checking these outputs will divide the output sectionin half for the Left and Right audio outputs. Notice that the headphoneoutputs will test the outputs of IC1401 only. Consequently, if there is a NoSpeaker Output condition on the Left or Right outputs then checkingheadphone outputs will determine if IC1401 PCM/PWM processor is atleast working properly.

The other PCM/PWM processors (IC1402, IC1403 and IC1404) outputswill have to be probed for the proper digital signal (Ref. Waveform 3-2).

Both High and Low-outputs of the DED ICs are fixed 5Vpp and applied tothe input of each Digital Amplifier (Ref. Waveform 3-3).

The supply voltage to the Digital Amplifiers and Output Switching MOSFETsis varied to control the output signal for the Mid-Volume range.

The High-output of the Digital Amplifiers are fixed 15Vpp (Ref. Waveform3-4) until the start of the mid-volume range (approx. –20db), where it willincrease to 75Vpp at maximum volume. The Low-output remains fixed at10Vpp (Ref. Waveform 3-5) over the complete volume range.

Example Output Speaker Drive Circuit Function:

The Digital amplifier IC1531/pin 3 high-output drives Q1651/gate with thesignal amplitude range of 15Vpp to 75Vpp depending on the volume setting.The high-side MOSFET provides the actual speaker drive signal. Thelow-output IC1531/pin 8 a fixed 10Vpp signal drives Q1671/gate. Thelow-side MOSFET insures a constant 0Vdc reference level for the outputdrive signal at the common MOSFET output (Ref. Waveform 3-6). TheOutput Switching MOSFETs are wired to form a half-bridge configurationvery similar to the configurations found in a switch-mode power supplyoutput stage. The MOSFETs alternately switch ON and OFF. For example,when Q1651 is ON, Q1671 is OFF and visa-versa.

29


H OUT Q1666G S

Q1686G DL OUT

H OUT Q1656G S

Q1676G DL OUT

H OUT Q1664G S

Q1684G DL OUT

H OUT Q1654G S

Q1674G DL OUT

IC1910BUFFER

3

4

6

DSD L

DSD R

DSD C

DSD SL

17

IC1900BUFFER

3

4

5

DATA L/R

DATA C

DATA SL/SR

2

DATA BL/BR

16

15

18

14

18



FIGURE 3-9 - 2CH & MULTI-CH (LEFT CHANNEL & CENTER) SIGNAL PATH (D-AMP BOARD)A126.2 6/16/04

2

7DSD SR

8DSD SBL

9DSD SBR

12

11

17 IC1950DIGITALFILTERDC CUT

41

42

43

44

IC1401PCM/PWM

PROCESSOR

50

49 21

18

24

15

43

IC1402PCM/PWM

PROCESSOR

50

21

18

24

15

43

16

13

IC1403PCM/PWM

PROCESSOR

50

21

18

24

15

49

43

IC1404PCM/PWM

PROCESSOR

50

21

18

24

15

49

43

DSD L

DSD R

DATA L/R

DSD C

DATA C

DSD SL

DSD SR

DATA L/R

DSD SBLDSD SBRDATA L/R

IC1511DEDTIME

12

2

8

6

IC1521DEDTIME

12

2

8

6

IC1513DEDTIME

12

2

8

6

IC1523DEDTIME

12

28

6

IC1514DEDTIME

12

2

8

6

IC1524DEDTIME

12

2

8

6

IC1516DEDTIME

12

2

8

6

IC1526DEDTIME

12

2

8

6

IC1531DIGITALPOWER

AMP

5

6

3

8

IC1541DIGITALPOWER

AMP

5

6

3

8

IC1533DIGITALPOWER

AMP

5

6

3

8

IC1543DIGITALPOWER

AMP

5

6

3

8

IC1534DIGITALPOWER

AMP

5

6

3

8

IC1544DIGITALPOWER

AMP

5

6

3

8

IC1536DIGITALPOWER

AMP

5

6

3

8

IC1546DIGITALPOWER

AMP

5

6

3

8

H OUTQ1651G S

Q1671G DL OUT

H OUT Q1661G S

Q1681G DL OUT

H OUTQ1653G S

Q1673G DL OUT

H OUT Q1663G S

Q1683G DL OUT

L/A SPK+

L/A SPK-

C+

C-

SL+

SL-

BL+

BL-

CONTINUEDFROM

FIG. 3-5

CONTINUEDFROM

FIG. 3-6

REF.WAVEFORM 3-1

REF.WAVEFORM 3-2

REF.WAVEFORM 3-3

REF.WAVEFORM 3-4

REF. WAVEFORM 3-5REF. WAVEFORM 3-6

D-AMP BOARD

30


FIGURE 3-10 - RIGHT CHANNELS SIGNAL PATH A126.4 6/7/04

+

-

IC1401PCM/PWM

PROCESSOR

10

7

4

1

+

-

+

-

IC1403PCM/PWM

PROCESSOR

10

7

4

1

+

-

+

-IC1404

PCM/PWMPROCESSOR

10

7

4

1

+

-

IC1512DEDTIME

12

2

8

6

IC1522DEDTIME

12

2

8

6

IC1515DEDTIME

12

2

8

6

IC1525DEDTIME

12

2

8

6

IC1517DEDTIME

12

2

8

6

IC1527DEDTIME

12

2

8

6

IC1542DIGITAL

AMP

5

6

3

8

IC1532DIGITAL

AMP

5

6

3

8

IC1545DIGITAL

AMP

5

6

3

8

IC1535DIGITAL

AMP

5

6

3

8

IC1547DIGITAL

AMP

5

6

3

8

IC1537DIGITAL

AMP

5

6

3

8

Q1682

Q1662G

G

S

DR A & B

SPEAKER -

Q1672

Q1652G

G

S

DR A & B

SPEAKER +

Q1685

Q1665G

G

S

DSR-

Q1675

Q1655G

G

S

DSR+

Q1687

Q1667G

G

S

DSBR-

Q1677

Q1657G

G

S

DSBR+

49DSDRFROMIC1910

43DATA/LRFROMIC1950CONTINUED FROMFIG. 3-9

49DSD SRFROMIC1910

43DATA SL/SRFROMIC1950CONTINUED FROMFIG. 3-9

49DSD SBRFROMIC1910

43DATA BL/BRFROMIC1950CONTINUED FROMFIG. 3-9

CONTINUED FROMFIG. 3-9



31


WAVEFORM 3-1

3Vpp

2V/div2 S/divu

WAVEFORM 3-2

5Vpp

2V/div2 S/divu

WAVEFORM 3-3

5Vpp

2V/div2 S/divu

WAVEFORM 3-4

14Vpp

5V/div2 S/divu

WAVEFORM 3-5

9Vpp

5V/div2 S/divu

WAVEFORM 3-6

6.5Vpp

2V/div2 S/divu

WAVEFORM 3-7SPEAKER OUTPUT TERMINALS

10Vpp

u5V/div500 S/div

32

4. Video Processing System

Chapter 4 - Video Processing System

Overall Video BlockReference Fig. 4-1

IC3751SWITCH

FIGURE 4-1 - VIDEO SIGNAL PATH OVERALL BLOCK

COMPOSITVIDEOINPUTS

A126.4-1 6/16/04

IC3421INPUT

SELECT

V VVIDEO OUT2ND ZONE

IC3431INPUT

SELECT

VVIDEO 1 & 2OUTV

IC702C-INPUTSELECT

IC701Y-INPUTSELECT

IC3651OSD/VIDEO

SELECT

IC3521VIDEO

BUFFER

IC3501OSDAMP

IC3641AMP

MONITOROUT (V)

IC3641AMP

IC3601COMBFILTER

V

Y/C

OSDV & Y/C

Y/C

Y/C

S-VIDEO

IC3661SWITCH

IC3701CHROMADECODER

RY3301RY3302

S-VIDEOMONITOROUT(S-VIDEOBOARD)

Y/C Y/C

Y/B-Y/R-YCOMPONENTOUT

S-VIDEOINPUTS

Y/C

Y/C

IC3321VIDEOAMP

VIDEO BOARD

S-VIDEOBOARD

IC2601MAIN

MICRO

DIGITAL BRD.OSDDATA

TV & DVDCOMPONENTINPUTIC3741

Y/C

IC3671VIDEOAMP

OverviewReference Fig. 4-1The AV receiver accepts Composite, S-Video and Component inputs.The video process system can perform the following conversions:

• Composite > S-Video > Component

• S-Video > Component

NOTE: It does not perform any processing or conversions on componentvideo inputs, such as converting component to s-video or composite.

The receiver also generates its own OSD for all menus, which isgenerated by the Main Microprocessor IC2601

33


Overall Video BlockReference Fig. 4-1

As illustrated on the overall block, all video processing and switching (exceptfor the S-Video switching) is performed on the Video board. The S-Videoinput switching is performed on the S-Video board. Consequently, if avideo problem exists, the most likely area where the defect is locatedwould be on the Video board. The next section provides a troubleshootingflow-chart and diagrams for troubleshooting.

The main feature to notice about Figure 4-1 is how the diagram can bedivided into separate sections depending on the input applied and theoutput viewed.

For example:

1) The Composite, S-Video, or OSD inputs can be applied to bypassswitching section. For example, applying a signal to the compositeinput bypasses the S-Video input select circuit and visa-versa. TheOSD will bypass both the composite and s-video input selectcircuits. NOTE: The S-video input bypasses the Comb-Filter andgoes directly to the switch IC3751.

2) The Video outputs (1, 2 and 2nd Zone) can be used to check theswitching ICs only. If these outputs are present, the Input Selectcircuit is OK.

3) The Monitor Out (V) when viewed divides the video processingsection basically in half. This confirms all ICs to the left of IC3651on Figure 4-1 (including IC3651) are OK.

4) The S-Video Monitor and Component Outputs can be used tobypass each other.

Video Section TroubleshootingNOTE: Reference Figure 4-1, the overall block diagram, while followingFlow-Chart 4-1. The idea is to use the troubleshooting flow-chart 4-1 toboard level diagnosis. The flow-chart will then point to a more detaileddiagram to troubleshoot to component level if necessary.The initial symptom at the start of flow-chart 4-1 assumes “No Video” atthe Component and/or S-Video outputs. Although the “No Video” symptomis used to start flow-chart 4-1, it can be substituted with “Distorted Video”to diagnose a distortion issue.

34


INPUT S-VIDEOSIGNAL

DEFECT IN IC3651OR IC3641


FLOWCHART 4-1 - FLOWCHART FOR VIDEO PATH COMPONENT LEVEL DIAGNOSTICSA126FLOWCHART.4-1 6/8/04

NO COMPONENT OR S-VIDEO MONITOR OUT

NOTE: REFERENCE VIDEO SIGNAL PATH OVERALL BLOCK FIG. 4-1 WHILE FOLLOWING FLOWCHART

"NO VIDEO"

INPUT COMPOSITE(V) SIGNAL

CHECKVIDEO 1 & 2

OR ZONE 2 OUTPUT(PRESENT?)



YES

CHECKMONITOR OUT (V)

(PRESENT?)

YES

CHECKCOMPONENT& S-VIDEO

MONITOR OUTPUT(PRESENT?)

YESGO TO FIGS. 4-2& 4-3COMPONENTLEVEL DETAIL

NO S-VIDEOMONITOR (ONLY)J701



GO TO FIG. 4-3COMPONENT LEVEL DETAIL

DEFECT INONE OF

FOLLOWINGCOMPONENTS:IC3741, IC3701,IC3321, RY3301

RY3302


NOTE: S-VIDEO BOARD MUST BE CONNECTED INORDER FOR SELE CT LINES TO FUNCTION.ALL PULL-UP RESISTORS ARE LOCATED ONS-VIDEO BOARD.

DEFECTIVEIC3751


NO COMPONENTOUTPUT

J3301(ONLY)

NO VIDEO ,S-VIDEO,OR COMPONENT

OUTPUT

35


FIGURE 4-2 - COMPOSITE VIDEO SIGNAL FLOW

C3401

A126.4-2 6/15/04

C3403

C3405

C3407

IC3421INPUT

SELECT

3

5

9

13

7

IN

IN

IN

IN

IN

IC3431INPUT

SELECT

3

5

9

13

7

IN

IN

IN

IN

IN

TV/SAT

DVD/LD

VIDEO 2

VIDEO 1

CNS741

S-VIDEOBRD.

CN5742

15

3

J1002

CN1019

VIDEO 3BRD.

VIDEO 3INPUT

1OUT J3403 (2ND ZONE)

11

15

1

J3402 (VIDEO 2 OUT)

J3402 (VIDEO 1 OUT)

OUT

OUT

OUT

IC3641OSD/VIDEO

SWITCH

12 IN 14 IC3641VIDEOAMP

1 4C3643

+

+IC3451VIDEOAMP

1 4

TOJ3401MONITOROUT(COMPOSITE)

C3645+

C3647+

C3606+

Q3641BUFFER

TO IC3601GO TO FIG. 4-3

VIDEO BOARD

CN3804

2

8

+

+

+

+C3428

+

C3402+

C3404+

C3406+

C3408+

C3436+

C3452WAVEFORM4-1

WAVEFORM4-2

R3643R3644

WAVEFORM4-10

36


IC3701CHROMADECODER

Y IN

C INY

B-Y

R-Y

IC3321VIDEOAMP

Y

B-Y

R-Y

FIGURE 4-3 - COMPOSITE VIDEO SIGNAL PATH

IC3601COMBFILTER

VINFROMQ3641CONT.FROMFIG. 4-2

A126.4-3 6/16/04

2

9

7

Y

C

Q3621B EC3622

Q3631B EC3632

Q3622B E

Q3632B E IC3751SWITCH

5

12

3

13

From Q3651S-Video DierectContinued FromFig. 4-4

C IN

Y IN

4

C IN

Y IN

C OUT

14Y OUT

C3741 C3743

7C3325

18

4C3324

7

1C3323

6

32

34C3713

+

11

13

15

Y

B-Y

R-Y

RY3301

RY3302

J3301

Y/B-Y/R-YOUT

IC3741 VIDEO AMP

8 1

Y IN5 C IN

COUT

4

IC3661 MODE

SELECTIN

5IN

12

4

14

C3673

C3671

IC3671 VIDEO

AMPIN

1IN

8

5

4

C3672

C3675

YOUT

+

+

+

OUT

OUT

C

Y C702

C

Y

TOJ701S-VIDEOMONITOROUT

1

2

17

16

CN3804 CNS741

LPF SECTION

VIDEO BRD. S-VIDEO BRD.

+

WAVEFORM4-3

WAVEFORM4-4

WAVEFORM4-7

7) WAVEFORM 4-86) WAVEFORM 4-9

WAVEFORM4-6

+ +

WAVEFORM 4-5

37


IC3651OSD/VIDEO

SWITCH

TV/SAT

FIGURE 4-4 - S-VIDEO SIGNAL PATH A126.4-4 6/7/04

S-VIDEO BOARD

IC702C-INPUTSELECT

22 C IN

1

16

14

19

10

5

8

C IN

C IN

C IN

C IN

C OUT

C OUT

COUT

IC701Y-INPUTSELECT

3 Y IN

5

9

13

7

1

11

15

Y IN

Y IN

Y IN

Y IN

Y OUT

Y OUT

YOUT

C713

C716

C726

C736

C741

DVD/LD

VIDEO 2

VIDEO 1

VIDEO 3(FROMVIDEO 3BOARD)

5

2

14

13

4

5

C

Y

C

Y

C

YCY

4C OUT

Y OUT 15


TO J703VIDEO 2 OUT

TO J704VIDEO 1 OUT

VIDEO BOARD

CNS741 CN3804S-Video Inputs

38


1.0Vp-p

WAVEFORM 4-1

IC3431/PIN 1

1.0Vp-p

WAVEFORM 4-2

IC3651/PIN 14

1.1Vp-p

WAVEFORM 4-3

IC3601/PIN 9

0.75Vp-p

WAVEFORM 4-4

IC3601/PIN 7

39


1.4Vp-p

WAVEFORM 4-5

IC3701/PIN 32

1.2Vp-p

WAVEFORM 4-6

IC3701/PIN 34

1.2Vp-p

WAVEFORM 4-7

IC3701/PIN 8

1.7Vp-p

WAVEFORM 4-8

IC3701/PIN 7

40


1.7Vp-p

WAVEFORM 4-9

IC3701/PIN 6

1.0Vp-p

WAVEFORM 4-10

IC3451/PIN 4

41

5. System Control System

Chapter 5 - Protection Circuits

FIGURE 5-1 - IRREGULAR OUTPUT CURRENT PROTECTION - L CHANNEL A126.5-1 6/7/04

L-

Q1661

Q1681

IC1541H-OUT

IC1541L-OUT

L+

Q1651

Q1671

IC1531H-0UT

IC1531L-OUT

R1711 C1731

6.7V

Q1721

FROM ALL OTHERPROTECTION

CIRCUITS LISTEDIN TABLE 5-1 R1701

R1893 C1892+

0V

3.3V TO SUB-MICRO

IC1800/PIN 1

33V TO 68V SUPPLYFROM REG BOARD

CHANNEL PROTECTION CIRCUIT L Q1721, R1631, R1641 R Q1722, R1632, R1642 C Q1723, R1633, R1643

SL Q1724, R1634, R1644 SR Q1725, R1635, R1645 SBL Q1726, R1636, R1646 SBR Q1727, R1637, R1647

TABLE 5-1 - PROTECTION CIRCUIT PER CHANNELEXCESSIVE CURRENT

NOTE: All channels use identical circuits.Left-channel is used here as anexample

0V Q1891INVERTER

0VNORMAL OPERATION

R16311W

R16411W

6.7V

OverviewThe following five protection circuits (with error code) found in the STR-DA5000, 3000 and 2000ES models are covered in this section:

1) Excessive Output Amplifier Current – Error 11

2) Power Supply Temperature – Error 12

3) Output Amplifier Temperature – Error 13

4) Output Amplifier DC Detection – Error 21

5) Output Amplifier B+ Detection – Error 22

Excessive Output Amplifier Current (Error 11)

42


FIGURE 5-2 - OUTPUT AMPLIFIER & REGULATOR BOARD TEMPERATURE PROTECTION A126.5-3 6/16/04

TH1781

9V

MOUNTED NEAREACH AMPLIFIERSECTION

R1791Q1791

Q1781 TO SUB-MICROIC1800/PIN 35

R1781C1616

TH901

+5V

THERMISTORBOARD

MOUNTED ONREGULATORHEATSINK

R907 C906

TO SUB-MICROIC1800/PIN 3

TABLE 5-2 - AMPLIFIER TEMPERATUREPROTECTION CIRCUITS PER CHANNEL

D-AMPBOARD

REG BOARD

9V

R1771 R1761

Q1771+0.18V

+0.7V1CN910

+4V

L TH1791 & Associated Transistors R TH1792 “ “ “ C TH1793 “ “ “ SL TH1794 “ “ “ SR TH1795 “ “ “

SB/SBR TH1796 “ “ “

Transistor Q1721 and associated circuitry shown in Figure 5-1 monitorsthe flow of current through the output MOSFET transistor for the Left-Channel. There is an identical protection circuit connected to all the otheroutputs; these are listed in Table 5-1.

The current supplied to the output MOSFETs flows directly through thetwo 1W resistors, in the case of Figure 5-1 R1631 and R1641. These tworesistors are directly across the base/emitter junction of Q1721. Thevoltages on the base and emitter are equal in normal operation (6.7V). Asthe current increases due to a possible defective output, the voltage at the

emitter of Q1731 will remain constant while the voltage on the base ofQ1721 will decrease due to the voltage drop increase across R1631 andR1641. When the voltage drop reaches 0.6V, Q1721 turns ON, whichthen turns ON Q1891 and a low is applied to the Sub-Micro IC1800/pin1.

The above circuit description applies for all other excessive currentprotection circuits, only the component references change. The outputfor the other protection circuits is applied at the junction of R1893 andR1701 as shown in Figure 5-1, which then turns ON Q1891.

Regulator and Output Amplifier Temperature ProtectionCircuits (Error 12 and Error 13)

43


FIGURE 5-3 - SPEAKER OUTPUT DC VOLTAGE DETECT CIRCUIT - L CHANNEL A126.5-2 6/16/04

Q1661

Q1681

IC1541H-OUT

IC1541L-OUT

L+

Q1651

Q1671

IC1531H-0UT

IC1531L-OUT

B+

B+

Q1751

D1316

0V

3.3V

3.3V

0V

3.3V

3.3V

Q1761

R1731

R1741

220K

220K


TABLE 5-3 - OUTPUT DC DETECTIONCIRCUITS PER CHANNEL

SPEAKER

L-

0Vdc

CHANNEL PROTECTION CIRCUIT L Q1751, Q1761 R Q1762, Q1752 C Q1763, Q1753 SL Q1764, Q1754 SR Q1765, Q1755 SBL Q1766, Q1756 SBR Q1767, Q1757

There is a thermistor mount near each channel’s output amplifier stage tomonitor the temperature as listed in Table 5-2. The resistance across thethermistor decreases as temperature increases. As the thermistorresistance decreases, the current trough it increases and the base voltageof Q1791 increases. Q1791 turns ON Q1781, which turns ON Q1771 andapplies a low to the Sub-Micro IC1800/pin 35.

Note: Error 12 indicates excessive temperature condition in one ofthe output channels. To determine which channel is causing theerror check the DC level at the base of each thermistor switchtransistor. For example, check the DC level at the base of Q1791 as

shown in Figure 5-2. If the voltage goes above 0.6V before the unitgoes onto protection that indicates the defective output stage.

Also shown in Figure 5-2 is the temperature monitoring circuit for theregulator board REG. Thermistor TH901 is mounted on the REG boardheat sink. The output of the thermistor is applied directly to the Sub-MicroIC1800/pin 3.

NOTE: Error 13 indicates an excessive temperature condition on theRegulator board, possible caused by a short regulator or B+ switchingtransistor (e.g. Q909 or Q904).

Output Amplifier DC detection Circuit (Error 21)

44


FIGURE 5-4 - OUTPUT AMPLIFIER B+ DETECTION CIRCUIT A126.5-4 6/7/04

SBR+

FROMDIGITAL AMP

IC1537

B+

FROMDIGITAL AMP

IC1537

R1889

D18033.6V R1803


D-AMP BOARD

2.5V

Q1677

Q1657

The circuit shown in Figure 5-3 monitors for the presence of a positive ornegative 3V DC difference level across the speaker output for the Left-Channel. There is an identical protection circuit for all channels. Theseare listed in Table 5-3.

The transistors Q1751 and Q1761 are configured so that a positive ornegative DC difference level can be detected between the L+ and L-outputs.

For example, if a positive DC level is detected at the L+ output in referenceto L-, Q1761 will turn ON and apply a high through D1316 to IC1800/pin32. If a negative DC level is detected at the L- output in reference to L+,Q1751 will turn ON and apply a high through D1316 to IC1800/pin 32.This same circuit description applies for all other outputs listed in Table 5-2.

Note: An Error 21 indicates most likely a failure of a MOSFET outputtransistor.

To determine which output channel has the defective MOSFET, placea VOM across each speaker output individually, and power the unitON. A DC level (~3V) at any output before unit goes into protectionindicates a defective channel (Check the MOSFET outputs for thatchannel).

Output Amplifier B+ Detection Circuit (Error 22)

45

5. System Control SystemAs shown in Figure 5-4, B+ (33V to 68V) is applied to the Sub-Micro IC1800/pin 16 through R1889, which is used to drop B+ to approximately 2.5V(this circuit is located near the SBR speaker output circuit). This circuitdetects the presence of output stage B+ supply. If the supply is missing,IC1800/pin 16 will go low and error 22 will be displayed. The 3.6V zenerdiode D1803 protects against the line going above 3.6V.

NOTE: An Error 22 indicates a missing B+ not a defective outputstage. If this error occurs the Switching Regulator is defective, orOpen Circuit in the B+ path has occurred, and B+ is not supplied tothe output stage.

46

6. System Control

Chapter 6 - System ControlOverall Block

FIGURE 6-1 - SYSTEM CONTROL OVERALL BLOCK

IC2201DSP

IC2251DSP

IC3601COMBFILTER

IC3241

IC3431

IC702

IC701

IC3651

IC3501

IC3751

IC3661

TUNER

IC3701CHROMADECODER

IC1800SUB SYSTEMCONTROL #2

TO SWITCHREGULATOR BRD.(VOLUME CONTROL)

CONTROL

OVER CURRENTPROTECTOVER VOLTAGEPROTECT

HEADPHONE RELAY

SPEAKER A/B RELAY

POWERRELAY

S-MUTE

IC2005SWITCHER

IC401SWITCHER

IC341SWITCHER

DIGITAL

2CH

MULTI-CH

IC1401PCM/PWM

IC1402PCM/PWM

IC1403PCM/PWM

IC1404PCM/PWM

CONTROL

HEADPHONEDETECT

FL BRD.

IC2962

IC2912

IC2862

IC2812

IC326

IRFRONT

IC2601MAIN SYSTEM

CONTROL

IRREAR

IC2701SUB SYSTEMCONTROL #1 IR RX

CONTROL

IC2706SYSTEMRESET

IC2121I/F RECEIVER

CONTROLRS232INPUT

IR RX

A126.6-1 6/7/04

CONTROLCONTROL CONTROL

CONTROL

CONTROL

15 16

X27017.28 MHZ

X260116.5 MHZ

VOLUME BRD.

KEY BRD.

POWERSWITCH

JOG BRD.

FUNCTION BRD.

22 23

X18008 MHZ

VIDEOSWITCHING ICs ELECTRICAL

VOLUME ICs

5857

SWITCHINGREGULATOR

IC1005INVERTER

LED DRIVEQ1004, Q1003

D1020D1021D1022

TEMPERATUREPROTECT

IR TX

CONTROL

CONTROL

CONTROL

CONTROL

47

6. System ControlThe main item to note about the Overall System Control Block is whatcircuits are controlled by each system control. This will be very helpfulwhen determining if one of the system controls is defective.

Key Control Functions of System Control ICs:

• Main Micro:o All Key-Scan functionso Switching Regulator Control

§ Power Change Signal§ Stop Signal

o Audio & Video Switching ICso Audio & Video Processing ICso IR Receiver Processing

• Sub-Micro #1:o System Reset Generationo RS232 Interfaceo IR Transmitter Processing

• Sub-Micro #2:o All PCM/PWM Processing Controlo Switching Regulator Control

§ Power Switch Signalo All Protection Circuits Interfaceo Headphone Relay Controlo A/B Speaker Relay Control

TroubleshootingIC2601 (Main Micro) and IC2701 (Sub-Micro #1)If either of these microprocessors should fail, the unit will not power-up(no display and no functions) when the ON/OFF button is pressed. Todetermine which component is at fault, perform the following checks:

1) Apply AC Power.2) Press ON/OFF button: No Reaction.3) Check Switching Regulator Standby Power Supply 12V at CN8/

pin 3 (Reference Fig. A-5, Appendix A).a. If missing, troubleshoot Switching Regulator (Ref. Chapter

2).b. If the Standby 12V at CN8/pin 3 is Pulsing as shown in

Waveform 6-1:i. Check voltage at CN8/pin 8 and CN8/pin 6, if also

Pulsing as shown in Waveform 6-2 & 6-3, thenIC2601, the Main Micro, is defective (first confirmCrystal and Supply Voltage before replacement).

c. If Standby 12V is present and stable, go to step 44) Check REG board Standby Output Voltages at CN909/pin 7 (+5VB)

and CN909/pin 8 (+3.3VB).a. If missing, troubleshoot IC912 and IC911 regulators on REG

board (Ref. Chapter 2).b. If +5V and +3.3V are present and the unit still does not

power-up, then IC2701 Sub-Micro #1 is defective (firstconfirm Crystal and Supply Voltage before replacement).

48

6. System ControlIC1800 Sub-Micro #2If IC1800 (Located on D-Amp board) fails, the unit will still power-up, butno speaker audio is present. Perform the following checks to determine ifeither IC1800 is defective or there is a defect along the audio path:

1) Check Pre-Out audio outputs.a. If audio is present at Pre-Out and the is no audio present at

ALL speaker channel outputs, then this confirms there is adefect on the D-Amp board and also IC1800 is possiblydefective. Go to Step 2.

b. If audio is not present at random Pre-Out & SpeakerOutputs, then there is a defect along the audio path.Reference Chapter 3 for Audio troubleshooting.

2) Check any of the following functions to confirm a defective IC1800.These functions are all performed by IC1800 (first confirm Crystaland Supply Voltage before replacement):

a. Speaker A to B relay switching with Speaker Switch.b. Headphone Relay switching (plug in headphones).c. Temperature Protection circuits.

WAVEFORM 6-1

3Vpp

2V/div100 ms/div

WAVEFORM 6-2

0.9Vpp

1V/div100 ms/div

WAVEFORM 6-3

0.2Vpp

0.1V/div100 ms/div

i

Appendix A

Appendix A

S-VideoBooard

CISBoard

VideoBoard

Audio Board Analog SubBoard

(on AudioBrd)

D-Amp Board

REG Board

SwitchingRegulator

DigitalBoard

Pre-OutBoard

UnderneathAudio Board

FIGURE A-1 - OVERALL BOARD LOCATION

Front Panel

FL Board

JogBoard

HPBoard

PowerSW

& PowerBoards

LEDBoard

VOL Board

FunctionBoard

FIGURE A-2 - FRONT PANEL BOARD LOCATION

ii

Appendix A

Video Board

Audio Board

Analog SubBoard

CNP622 CNP621 CNP620

CNP602CNP601

FIGURE A-3 - ANALOG SUB BOARD CONNECTORS

REG Board

CN909CN913

CN914

FIGURE A-4 - REG BOARD CONNECTOR LOCATION

iii

Appendix A

SwitchingRegulator

Board

CN1

CN2

CN3

CN8

CN4 CN7

CN5

CN6

FIGURE A--5 - SWITCHING REG CONNECTORS

and ES® are trademarks of Sony Electronics

©2004 Sony Electronics Inc.EMCS - A Service Company

1 Sony DrivePark Ridge, New Jersey 07656

Reproduction in whole or part without written permission is prohibited. All rights reservedA1260604 6/21/04

AV Receiver With Digital Amplifier Technology STR-DA5000ES, STR-DA3000ES, STR-DA2000ES Diagnostics and T

Documents

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digital audio systems

output channels

digital media

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analog digital audio

digital input signal