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Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

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2005 Pioneer Home Audio Seminar VSX49TX Pioneer Electronic Service, Inc. 2005
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Page 1: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

2005 Pioneer Home Audio Seminar

VSX49TX

Pioneer Electronic Service, Inc. 2005

Page 2: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Introduction

Why the VSX49TX?The VSX49TX is not current product, however it

tends to be the most difficult to repair!

What will be covered?The receiver in general; more specifically…Display & System MicroAmplifier and Protection circuit.Power Supply DSP circuitryTrouble Shooting Tips

Page 3: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

This seminar manual will be specifically about troubleshooting techniques, no operation instructions, no theory!

Page 4: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

What will you get out of this?You will learn the most successful

troubleshooting methods designed to get the unit on and off your bench as quickly as possible.

You will learn more accurate repair techniques and avoid having to replace costly boards on out-of-warranty units. Replacing expensive boards can sometimes mean the difference between getting the repair or having the customer walk!

Page 5: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Topics we will cover

Minor disassemblyDSP circuitryAmplifier & Protection circuitsSystem MicroprocessorDisplay MicroprocessorPower SupplyAdditional resources

Page 6: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Disassembly

Remove no more than you have to!Use caution when removing the back panel screws. They are different !

You are using your ESD wrist strap aren’t you?

ESD precautions are a fact of life!Why do your work over and over again due to static damaged components!

Page 7: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

To start…1. Place unit as pictured and remove top, bottom and side

covers.2. Prop up unit as pictured for easy access.3. Remove all screws holding the DSP boards, as well as

any attached connectors or wire ties.

Page 8: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Remove only the screws necessary as shown below.

Why spend more time than you have to?

Page 9: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Use caution when removing screws. There are 3 different types !

Page 10: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Keep track of the screw types.

Correct place for screw with integral flat and attachedstar washer.

Page 11: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

With the screws removed, gently pull back on the back panel, while extracting the DSP and DSP3 assemblies.

Page 12: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP boards removed

Page 13: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Digital Signal ProcessingThe DSP circuit consists of 3 boards

1. AWK7719 DSP ASSY2. AWK7727 DSP3 ASSY3. AWK7725 DAC10 ASSY

Page 14: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP assemblies

DAC10 ASSY#3

DSP3 ASSY #2

DSP ASSY#1

Page 15: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP ASSY

Page 16: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP3 ASSY

Page 17: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DAC10 ASSY

Page 18: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

SetupDVD Digital Input either Coaxial or OpticalSpeaker setup 5.1 or 5 channel(without

Subwoofer)Must use DVD with Surround information

{Be sure to look at front panel display}For the purpose of this seminar, we will

follow the left surround channel only.

Indicators must illuminatefor all channels driven.

No illumination, no audio!

Page 19: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

For your reference only

Depending on the accuracy of your scope, this voltage, 5 volts (TTL level), may vary by + or - .5 volts.

Page 20: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP Audio Block Diagram

Page 21: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP Audio Circuit

Page 22: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP Audio Circuit…continued

Page 23: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP Audio Circuit…continued

Page 24: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP Audio Circuit…continued

Page 25: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP Audio Circuit…continued

Page 26: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP Audio Circuit…continued

Page 27: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Test point DIR & DIT Pin 3

IC112 DIR & DITPin 3 In

Page 28: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Test point DIR&DIT IC101 Pin 3

More noise than signal

IC101Pin 3 DIR & DIT In

Page 29: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Test point DIR&DIT Pin 25

IC101Pin 25 DIR&DIT Out

Page 30: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Test point DIR&DIT Pin 25

IC101Pin 25 DIR&DIT Out

Page 31: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Test point Selector IC112 Pin 3

IC 112Pin 3 Selector In

Page 32: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Test point IC112 Pin 3

IC112Pin 3 Selector In

Page 33: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Test point Selector IC112 Pin 4

IC112Pin 4 Out

Page 34: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Test point Selector IC112 Pin 4

Test PointPin 4 Out

Page 35: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Test point DSP1 IC301 Pin 6

IC301DSP1Pin 6 In

Page 36: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Test point DSP1 IC301 Pin 6

Waveform very small. More noise than signal!

Page 37: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Test point DSP1 IC301 Pin 12

IC301DSP1Pin 12 Out

Page 38: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Test point DSP1 IC301 Pin 12

Page 39: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Test point DSP2 IC401 Pin 11

IC401DSP2Pin 11 In

Page 40: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Question…

How do I troubleshoot the DSP2 IC? It’s located directly under the DSP3 ASSY.

Answer..Simply remove the DSP3 ASSY.There won’t be any sound outputfrom the unit, but you can scope the digital waveform none the less!

DSP2 IC is under here.

Page 41: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Test point DSP2 IC401Pin 11 In

Page 42: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP2 IC401 Pin 5 Out

IC401DSP2Pin 5 Out

Page 43: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP2 IC401 Pin 5 Out

Page 44: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP3 IC501 Pin 6 In

IC501DSP3Pin 6 In

Page 45: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP3 IC501 Pin 6 In

Page 46: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP3 IC501 Pin 12 Out

IC501DSP3Pin 12 Out

Page 47: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP3 IC501 Pin 12 Out

Page 48: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DAC10 CN6002 Pin 11 In

DAC10 ASSYCN6002 Pin 11 In

Page 49: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DAC10 CN6004 Pin 10 Out

DAC10 ASSYCN6004 Pin 10 Out

Page 50: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DAC10 CN6004 Pin 10 Out

End of the line! Analog audio!Success!

Page 51: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Conclusion to DSP troubleshooting

1. Follow the digital signal into and out of DSP1, DSP2 and DSP3 ICs. Compare to waveforms seen in this presentation.

2. Look at the digital signal entering DAC10 ASSY. Look for analog signal to follow.

3. Loss of signal at any point requires back tracking to last good test point.

Page 52: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP Audio Flow PathIdeal path to follow(Left Surround)

JA107(DSP ASSY) IC101(DSP ASSY) IC112(DSP ASY)

IC301(DSP1)(DSP ASSY) IC410(Selector)(DSP ASSY)

IC401(DSP2)(DSP ASSY) CN402(DSP ASSY)

CN501(DSP3 ASSY) IC501(DSP3)(DSP3 ASSY)

CN501(DSP3ASSY) CN402(DSP ASSY)

CN402(DSP ASSY) CN707(DSP ASSY) Continued

Page 53: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Continued DSP PathCN6002(DAC10) IC6061(DAC10) IC6303(DAC10)

IC6305(DAC10) CN6004(DAC10)

CN5813(MotherASSY) CN5818(Mother ASSY)

CN5001(VR &Pre Out) IC5001(VR & Pre Out)

IC5061(VR & Pre Out) CN5006(VR & Pre Out)

CN4801(Power Amp) IC4401(Power Amp)

JA4801(Power Amp) Speaker

Page 54: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP Socket Issues

IC304 on DSP ASSY and IC504 on DSP3 ASSY.

Cold solder connections on these sockets can cause loss of audio in DSP mode. For complete loss of audio, at times associated with these sockets, try resoldering socket to PCB first. At the same time, clean and coat pins of socket and IC with DeOxit, or similar compound. If this doesn’t resolve the problem, remove the IC socket and solder the IC directly to the board.

Page 55: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

DSP troubleshooting tips

Complete loss of audioStep 1. Use Multi-Channel input jacks at rear.Step 2. Switch unit to Multi-Channel.Step 3. If audio returns, unit has a DSP ASSY problem. If still no

audio, remove DSP ASSY board and repeat steps 1 and 2. If audio returns, probable cause…DSP ASSY.

Step 4. If unit still has no audio, probable cause is VR & PRE OUT ASSY and beyond.

Step 5. To further isolate the problem, remove Main in/ Preout jumpers and insert audio directly into Main in, front channel. If still no audio, unit has amplifier problem.

Don’t forget to reinsert jumpers!

Page 56: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Easy tips for troubleshooting audioLoss of Analog audioInsert audio(Signal Injector), or noise(put finger on Test Point to generate noise), to ensure continuation of signal past that point. Move forward or backward in the circuit as needed.

Noise on Analog audio channelUse capacitor, or just short(if there is no DC voltage present) Test Point to ground at any point to silencethe noise. From that point and beyond, the circuit is OK. Move forward or backwards in the circuit as needed.

Please use caution and exercise good judgment!

Page 57: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Amplifier and

Protection Circuit

Page 58: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Protection Circuit

Page 59: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

ProblemUnit shuts off…

Display reads “AMP ERROR”

Probable cause…Damaged amplifier components.

Page 60: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Can there be other causes?

YES!How do I know if the amplifier is damaged for certain?

Page 61: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

How to check for DC Offset

DC Detection, Pin 15. Should be low(0V + - .5V)in normal operation. A high(5V + - .5V) denotes DC Offset and probable Amplifier damage.

CN5819

Page 62: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

What if DC Offset is detected?

How do I know which of the 7.1 channel(s) is bad?

Page 63: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Test points to narrow choices for DC Offset

Please note: DC Offset at these Test points can only be measured whenthe Power Supply voltages are up to spec.

Page 64: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

What if the voltage is within spec?

Check these transistors for all channels. Possibly shorted!

Page 65: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

None of those other parts bad?

Last place to look!

Page 66: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Amplifier

Page 67: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Amplifier Failures

Bad Voltage Amp IC.

If after replacing damagedIC(s), the amplifier(s) still shows DC Offset, one or both of these resistor(s) may be open!

1. Voltage Amp

Page 68: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Amplifier Failures

1. Amplifier output

Number 1 causeAlways replace in pairs.Don’t assume this is the only damage!

Page 69: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Amplifier Failures

If amplifier continues to have DC Offset after replacing output F.E.T.s, be sure to check these .1 Ohm resisters

2. Amplifier output

Page 70: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

System Microprocessor Basics

Page 71: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Standby Voltage On/Off

RYCTRL= Relay ControlDon’t become confused! This output line controls the operation of the standby 5.6 V line, not the ACrelays.

Page 72: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Energizing AC RelaysIf no DC Offset is present, Pins 58 and 60 will change state to control Port Expander IC.

PIN 60 EXPOE2Change of state enables Expander IC 1103 to allow data input.

PIN 58 EXPDT2Data output to Expander IC1103 to control AC1 and AC2 lines for AC relays.

Page 73: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Turn on signal for AC relays from Micro

RAC1 & RAC2To turn on AC RelaysTip…Look for change of state

Data and control lines

Page 74: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Mute…Main and Multi-Room

Pin 67 changes state to mute audio lines supplying MULTI-ROOMOutputs.

Pin 66 changes state to mute all audio lines to MAIN amplifiers.

Page 75: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Display MicroprocessorBasics

Page 76: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Turn on procedure

Key Scanin lines.

Most importantfor Turn On, Key Scan 1.Look for lowwhen pressingthe Stand By button. This point, whenstatically measured,(when pushed)14.9K Ohms to ground.

IC3001

Key Scan 1 line

Page 77: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Communication between Micros

Wake-Up output signal from IC3001, Pin 7, to input IC 5801,pin 20.

Page 78: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Volume up and downVolume up

Look for change of state from high to low when turning volume up.

Tip: Erratic voltage at Test point?Change Volume Encoder.

Page 79: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Volume down

Look for change of statefrom high to low when turningvolume down.

Tip: Erratic voltage at Test point?Change Volume Encoder.

Page 80: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Changing inputs

Look for change of state fromhigh to low when turning the inputknob to the left.

Tip: Changing inputs by itself?

1. Look into bulletin SI-H04018-G.PDF2. Change Input Encoder.

Page 81: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Changing inputs

Look for change of state fromhigh to low when turning the input knob to the right.

Tip: Changing inputs by itself?

1. Look at bulletin SI-H04018-G.PDF2. Change Input Encoder.

Page 82: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Things to keep in mind

First and foremost, don’t overlook the obvious!This is a very complex receiver. There are 16 fuses, A.K.A. IC Protectors,11 regulator ICs and countless fusibleresistors! There are published Tips related to nothing but blown fuses!

Page 83: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

To aid in TroubleshootingFirst be sure the unit is not drawing more than 1.65 amps at 120 volts!

Placing a shortacross C1002 will allow the unit to be run up slowlyon a Variac.

Page 84: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Normal ConditionUnit at idle, no input, no load

(Note: 2.5 amp scale) 1.65 amp + or – 10%

Page 85: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Note to current draw…

Normal current draw aftersettling, 1.65 amps.

Note: The unit will draw in excess of 7.5 amps as you run upthe AC voltage. Look for the current to drop as soon as you stop increasing the voltage. If it doesn’t, pull the plug! The unit is shorted!

Page 86: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Be sure to check all regulated supplies

Page 87: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Power supply voltages

CN40041. +5 volts Digital2. -5 volts Digital3. +5.6 volts 4. -5.6 volts5. +5.6 volts6. +15 volts Tuner7. +20 volts8. -20 volts

Page 88: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Power supply voltages

J40011. +52. Ground

Page 89: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Power supply voltages

J40041. +27 volts2. Ground3. -27 volts4. +55 volts5. Ground6. -55 volts

Page 90: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Power supply voltagesVery important!

Stand by 5.6 volts for the microprocessor

Page 91: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Please check on our Web Site for all Tips and Bulletins when repairing any product.

Page 92: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

One brief note on ESDLocated on our PioneerElectronics.comwebsite under training…5S ESD TrainingThe importance of ESD safe practice and preparation is vital to our mutualsuccess. It’s no longer business asusual in the Digital Environment. Precautions must be taken or damageWILL occur…

Page 93: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

Additional resources for ESD information…

1. ESDsystems.com

2. Desco.com

Page 94: Pioneer 2005 Pioneer Home Audio Seminar VSX49TX

We sincerely hope you will benefit from this information.

Thank you


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