Pioneer PDP-507XC Service Manual page 20

1
Flowchart of Failure Analysis for The Video-system Assy
A
No audio output from subwoofer
SUB-W Has the sound been emitted from the
SubWoofer?
NO
Is sound muting set?
NO
Is the volume set to [0]?
NO
Is a signal output from IC4701 ?
(31) (32)
YES
B
Has the signal arrived at CN4005?
YES
Is a signal output from CN9003 ?
YES
Is a signal output from IC9001?
(1) (7)
YES
Has the signal come to TP9051 ?
YES
C
Check the around of pin Jack.
*100Hz input. Sound volume is fixed to 25.
• Waveforms
41
IC4701 (31)(32)AC-SUBWOO
V:200mV/div H:4msec/div
Stop
D
E
F
20
1
2
YES
Cancel muting then check again.
YES
Raise the volume then check again.
NO Check the around of IC4701 and each input
signal. If there was no problem, replace IC4701.
41
NO
Check the communication between IC4701
to CN4005.
NO Check the Flexible cable between CN4005
and CN9003.
NO
Check around IC9001.
42
NO Check the contact between the CN9003 and
R9042.
IC4701 (31)(32)DC-SUBWOO
Stop
PDP-507XC
2
3
NG
Replace Main Ass'y
NG
Replace or reconnect flexible cable
NG
Replace Main Ass'y
NG
Replace TANSHI Ass'y
42
IC4704 (1)(7)AC-SUBWOO IC4704 (1)(7)DC-SUBWOO
V:200mV/div H:4msec/div
Stop Stop
3
4
4