Pioneer PDP-508XG Service Manual page 28

1
A
B
Has the sound been emitted from
the Headphones?
B
C
Waveforms
Input signal: L/R 1 kHz, 0.5 Vrms (VOL 30)
42 CN9251 - pins 2, 4
V: 2 V/div H: 1 mS/div
D
47 IC9101 - pins 54, 55
V: 2 V/div H: 5 μS/div
52 IC9101 - pins 38, 39
E V: 1 V/div H: 1 mS/div
F
28
1
2
No
Is sound muting set?
No
Is the volume set to 0?
No
Is a signal output from IC9101?
(pins 38, 39)
Yes
Is a signal output from IC8871?
(pins 1, 7)
Yes
Check the cables between CN8802
and CN9352 or check around the
Headphones jack.
43 CN9251 - pins 5, 7 44 IC9201 - pins 34, 38
V: 10 V/div H: 5 μS/div
V: 2 V/div H: 1 mS/div
48 IC9101 - pins 24, 25 49 IC9151 - pins 2, 3
V: 2 V/div H: 1 mS/div V: 2 V/div H: 1 mS/div
53 IC8871 - pins 1, 7
V: 1 V/div H: 1 mS/div
2
3
Yes
Cancel muting, then check again.
Yes
Raise the volume, then check again.
No
Check around the IC9101 and repair the failure points.
52
No Check the communications around the IC8871 and between the IC8871
and the microcomputer. If there was no ploblem, replace BH3544F.
53
NG
Replace the cables or SIDE IO Assy.
45 IC9201 - pins 44, 52
V: 10 V/div H: 5 μS/div
50 IC9151 - pins 5, 6
V: 2 V/div H: 1 mS/div
PDP-508XG
3
4
46 IC9101 - pins 52, 53
V: 2 V/div H: 5 μS/div
51 IC9151 - pin 1, etc.
V: 2 V/div H: 1 mS/div
4