Flowchart Of Failure Analysis For The Audio System - Pioneer PDP-6071PU Service Manual

5

5.1.7 FLOWCHART OF FAILURE ANALYSIS FOR THE AUDIO SYSTEM

Flowchart of Failure Analysis for The Audio System
No audio from monitor out
⇒ MONI_A
The sound is not emitted audio out.
Yes
Is a signal output from IC4701?
(pin 33, 34)
30
Yes
Has the signal arrived at CN4005?
Yes
Is a signal output from CN8803?
Yes
Has the signal come to TP8825
or TP8826?
Yes
Is a signal output from jack?
Yes
Finishing troubleshooting.
No audio output from subwoofer
⇒ SUB-W
Has the sound been emitted from
the Subwoofer?
Yes
Is a signal output from IC4701?
(pin 31, 32)
31
Yes
Is a signal output from IC4704?
(pin 1, 7)
32
Yes
Has the signal arrived at CN4005?
Yes
Is a signal output from CN8803?
Yes
Has the signal come to TP8843?
Yes
Check the around of pin Jack.
Waveforms
31
Input signal: 100 Hz
Sound volume is fixed to 25.
5
6
No
Check the surrounding of IC4701
and each input signal. If there was
no ploblem, replace the MAIN ASSY.
No
Check the communication
between IC4701 and CN4005.
No
Check the Flexible cable between
CN4005 and CN8803.
No
Check the contact between the
CN8803 and R8886.
Check the contact between the
CN8803 and R8887.
No
Check the communication
between the CN8803 and Jack.
If there was no ploblem, replace
IO Assy.
No
Cansel muting then check again.
Yes
Is the volume set to 0?
No
Check the around of IC4701 and
each input signal. If there was no
ploblem, replace the MAIN ASSY.
No
Check around IC4704.
No
Check the communication between
IC4704 to CN4005.
No
Check the Flexible cable between
CN4005 and CN8803.
No
Check the contact between the
CN8803 and R8892.
IC4701 - pin 31, 32 (AC-SUBWOO) IC4701 - pin 31, 32 (DC-SUBWOO)
31
V: 200 mV/div H: 4 msec/div V: 1 V/div H: 10 msec/div
6
7
NG
Replace the MAIN Assy.
NG
Replace or reconnect flexible cable.
NG
Replace the TANSHI Assy.
NG
Replace the TANSHI Assy.
No
Cansel muting then check again.
No
Raise the volume then check again.
NG
Replace the MAIN Assy.
NG
Replace the MAIN Assy.
NG
Replace or reconnect flexible cable.
NG
Replace the TANSHI Assy.
IC4704 - pin 1, 7 (AC-SUBWOO)
32
V: 200 mV/div H: 4 msec/div
PDP-6071PU
7
8
Waveforms
Input signal: 1kHz
Sound volume is fixed to 25.
IC4701 - pin 33, 34 (AC)
30
V: 500 mV/div H: 400 µsec/div
IC4704 - pin 1, 7 (DC-SUBWOO)
32
V: 500 mV/div H: 4 msec/div
99
8
A
B
C
D
E
F