Pioneer PRO-R04U Service Manual page 135

5
No sound
No sound from MONITOR
OUT
No
Yes
Is sound muting set?
No
Yes
Is the volume set to 0?
No
Is a signal output from
IC8003? No
(3) (13)
B
34 35
Yes
Check around the jack.
5
6
Cancel muting then check
again.
Raise the volume then
check again.
Check around IC8003 and
check each input signal.
PDP-R04U
6
7
7
8
A
B
C
D
E
F
135
8