DSP PWR-DSP3 Manuel d'utilisateur télécharger pdf (Page 56)

DSP troubleshooting tips

Complete loss of audio

Step 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!

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 95 96

Introduction 3
This seminar manual will be 4
Topics we will cover 6
Disassembly 7
To start… 8
There are 3 different types ! 10
Correct place for screw with 11
DSP boards removed 13
Digital Signal Processing 14
DSP assemblies 15
DSP ASSY 16
DSP3 ASSY 17
DAC10 ASSY 18
No illumination, no audio! 19
Indicators must illuminate 19
For your reference only 20
DSP Audio Block Diagram 21
DSP Audio Circuit 22
DSP Audio Circuit…continued 23
IC112 DIR & DIT 28
Pin 3 In 28
More noise than signal 29
Pin 3 DIR & DIT In 29
Test point DIR&DIT Pin 25 30
Pin 3 Selector In 32
Test point IC112 Pin 3 33
Pin 4 Out 34
Test Point 35
Test point DSP1 IC301 Pin 6 36
Test point DSP1 IC301 Pin 12 38
Test point DSP2 IC401 Pin 11 40
Question… 41
Answer 41
DSP2 IC401 Pin 5 Out 43
DSP3 IC501 Pin 6 In 45
DSP3 IC501 Pin 12 Out 47
DAC10 CN6002 Pin 11 In 49
DAC10 CN6004 Pin 10 Out 50
DSP Audio Flow Path 53
Continued DSP Path 54
DSP Socket Issues 55
DSP troubleshooting tips 56
Amplifier 58
Protection Circuit 58
Unit shuts off… 60
Can there be other causes? 61
How to check for DC Offset 62
How do I know which of 63
DC Offset 64
Possibly shorted! 65
Last place to look! 66
Amplifier Failures 68
System Microprocessor 71
Standby Voltage On/Off 72
Expander IC 73
RAC1 & RAC2 74
To turn on AC Relays 74
Tip…Look for change of state 74
Data and control lines 74
Mute…Main and Multi-Room 75
Display Microprocessor 76
Turn on procedure 77
Communication between Micros 78
Volume up and down 79
Volume down 80
Changing inputs 81
Things to keep 83
To aid in Troubleshooting 84
Normal Condition 85
Note to current draw… 86
Power supply voltages 88
One brief note on ESD 93
5S ESD Training 93
Additional resources for 94
ESD information… 94
Thank you 95

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DSP PWR-DSP3 Manuel d'utilisateur Page 56

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