PDP-4271HD
92
1
2
3
4
1
2
3
4
C
D
F
A
B
E
5.1.7 FLOWCHART OF FAILURE ANALYSIS FOR THE AUDIO SYSTEM
Is a signal output from IC4701?
(pin 33, 34)
Check the surrounding of IC4701
and each input signal. If there was
no ploblem replace MAIN Assy.
No
Check the communication
between IC4701 and CN4005.
No
NG
Replace the MAIN Assy.
NG
Replace the TANSHI Assy.
NG
Replace the TANSHI Assy.
Cansel muting then check again.
Is the volume set to 0?
Check around IC4704.
Yes
Yes
Has the signal come to TP8825
or TP8826?
Yes
Yes
Yes
The sound is not emitted audio out.
⇒
MONI_A
Has the signal arrived at CN4005?
Is a signal output from CN8803?
Is a signal output from jack?
Yes
No audio from monitor out
Yes
Yes
Has the sound been emitted from
the Subwoofer?
Yes
Is a signal output from IC4701?
(pin 31, 32)
Yes
Is a signal output from IC4704?
(pin 1, 7)
Has the signal arrived at CN4005?
Check the around of IC4701 and
each input signal. If there was no
ploblem, replace MAIN Assy.
⇒
SUB-W
No audio output from subwoofer
30
31
32
Finishing troubleshooting.
Check the Flexible cable between
CN4005 and CN8803.
No
NG
Replace or reconnect flexible cable.
Check the contact between the
CN8803 and R8886.
Check the contact between the
CN8803 and R8887.
No
No
No
No
Check the communication between
IC4704 to CN4005.
No
Cansel muting then check again.
No
Replace the MAIN Assy.
NG
Replace the TANSHI Assy.
NG
Replace the MAIN Assy.
NG
Yes
Is a signal output from CN8803?
Check the Flexible cable between
CN4005 and CN8803.
No
Yes
Has the signal come to TP8843?
Yes
Check the around of pin Jack.
Check the contact between the
CN8803 and R8892.
No
Replace or reconnect flexible cable.
NG
Raise the volume then check again.
No
Check the communication
between the CN8803 and Jack.
If there was no ploblem replace
IO Assy.
No
Waveforms
Input signal: 1kHz
Sound volume is fixed to 25.
30
IC4701 - pin 33, 34 (AC)
V: 500 mV/div H: 400
µ
sec/div
Waveforms
Input signal: 100 Hz
Sound volume is fixed to 25.
32
IC4704 - pin 1, 7 (DC-SUBWOO)
V: 500 mV/div H: 4 msec/div
32
IC4704 - pin 1, 7 (AC-SUBWOO)
V: 200 mV/div H: 4 msec/div
31
IC4701 - pin 31, 32 (DC-SUBWOO)
V: 1 V/div H: 10 msec/div
31
IC4701 - pin 31, 32 (AC-SUBWOO)
V: 200 mV/div H: 4 msec/div
Flowchart of Failure Analysis for The Audio System
Содержание PDP-4270HD
Страница 20: ...PDP 4271HD 20 1 2 3 4 1 2 3 4 C D F A B E 2 6 PANEL CHASSIS SECTION 1 2 3 6 4 5 8 8 8 8 8 8 9 13 7 10 12 11 14 ...
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Страница 189: ...PDP 4271HD 189 5 6 7 8 5 6 7 8 C D F A B E Block Diagram R2S11002AFT MAIN ASSY IC4701 AV SW ...
Страница 190: ...PDP 4271HD 190 1 2 3 4 1 2 3 4 C D F A B E Block Diagram R2S11001FT MAIN ASSY IC4901 Component SW IC ...