Pioneer PRO-810HD Service Manual page 142

1
Audio
No sound from the
speakers
A
Yes
Are the SP cables
properly connected?
Yes
Is sound muting set?
Yes
Is the volume set to 0?
B
Yes
AUDIO AMP Assy 2 3
Is a signal output from IC5003
on the AUDIO AMP Assy?
No
AUDIO AMP Assy 1
Has the signal arrived at IC5003
on the AUDIO AMP Assy?
No
A
AV I/O Assy =
Is a signal output from IC7603
C
on the AV I/O Assy?
No
Has the signal arrived at
IC7603 on the AV I/O Assy?
No
AV I/O Assy -
Is a signal output from IC7601
on the AV I/O Assy?
D
Yes
Is IC7601 on the AV I/O Assy
properly controlled by the
microcomputer?
Yes
Check the communication between
each input terminal and IC7601.
E
F
142
1
2
No
Connect the SP cables
properly then check again.
No
Cancel muting then check again.
No
Raise the volume then check again.
Check the connection between
Yes
the AUDIO AMP Assy and the
SP Terminal Assy.
Yes
Check around IC5003.
Check around IC7605, IC7606,
Yes
and IC7607 on the AV I/O Assy,
and the connection between the
AV I/O Assy and AUDIO AMP Assy.
Is communication between
Yes
IC7603 and the micro-
computer OK?
Yes
Check around the IC7603.
No
Check the communication
between IC7601 and IC7603.
No
Check the control line from
the microcomputer.
PRO-1010HD
2
3
No
Check the communication line.
3
4
4