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