Pioneer PDP-5050SX Service Manual page 147

5
No sound from the speakers (1/2)
No sound from the speakers
No
Yes
Is sound muting set?
No
Yes
Is the volume set to 0?
No
No
Is it the only TV sound that
doesn't come out?
Yes
Is a signal output normally
No
from the FE (U7501)?
(14)
40
Yes
Is a signal output from
No
IC7503?
(22), (23)
41 42
Yes
Is a signal input to IC8002?
No
(62), (64)
43 44
Yes
Check around IC8002 and
check the communications
between IC8002 and the
microcomputer.
5
6
Cancel muting then check
again.
Raise the volume then
check again.
Check the communications
around the FE and between
the FE and the
microcomputer.
Check around IC7503.
Check the communications
between IC7503 and
IC8002.
PDP-5050SX
6
7
Is it only the VIDEO 3
No
sound that doesn't come
out?
Yes
Is a signal input to IC8003?
No
(4), (11)
Yes
Check around IC8003 and
check the communications
between IC8003 and the
microcomputer.
Is it sound other than the
No
TV or VIDEO 3 that doesn't
come out?
Yes
Is a signal input to IC8002?
No
Yes
7
8
Check the communications
between the jack and
IC8003.
A
Check the communications
between the jack and
IC8002.
147
8
A
B
C
D
E
F