Pioneer PRO-R04U Service Manual page 137

5
No sound from the speakers (2/2)
A
Is it sound for every function
that doesn't come out?
No
Is a signal output from
No
IC8002?
B
Yes
Has the signal arrived at
No
TP9625 and TP9626?
B
45 46
Yes
Has the signal arrived at
No
TP9301 and TP9303?
B
47 48
Yes
Has the symptom been
No
settled when the system
cable is replaced?
Yes
Finishing troubleshooting
5
6
Check around IC8002 and
check the communications
between IC8002 and the
microcomputer.
Check around IC8003 and
check the buffer circuits.
Check the flexible cables
between the AV BOARD Assy
and MR MAIN BOARD Assy
and between the MR MAIN
BOARD Assy and MDR Assy.
The panel is defective.
PDP-R04U
6
7
7
8
A
B
C
D
E
F
137
8