PDP-504CMX/1
138
1
2
3
4
1
2
3
4
C
D
F
A
B
E
Audio
No sound from the
speakers
Yes
No
Are the SP cables
properly connected?
Is sound muting set?
Connect the SP cables
properly then check again.
Yes
Is the volume set to 0?
No
No
Yes
Cancel muting then check again.
Raise the volume then check again.
Yes
Is a signal output from IC5003
on the AUDIO AMP Assy?
Is a signal output from IC7603
on the AV I/O Assy?
Check the connection between
the AUDIO AMP Assy and the
SP Terminal Assy.
Yes
No sound from AUDIO
OUT
Yes
No
Is sound muting set?
Is the sound from the
AUDIO OUT in accor-
dance with VOL control?
Cancel muting then check again.
No
Yes
Yes
Is the volume set to 0?
No
Raise the volume
then check again.
Yes
AUDIO AMP Assy
#
$
Yes
No
Has the signal arrived at IC5003
on the AUDIO AMP Assy?
Check around IC5003.
No
Yes
Is IC7601 on the AV I/O Assy
properly controlled by the
microcomputer?
Yes
Check the communication between
each input terminal and IC7601.
Check the communication
between IC7601 and IC7603.
Check around the IC7603.
Is communication between
IC7603 and the micro-
computer OK?
Check the control line from
the microcomputer.
Yes
Has the signal arrived at
IC7603 on the AV I/O Assy?
No
Check the communication line.
AUDIO AMP Assy
@
Yes
No
No
No
Is a signal output from IC7601
on the AV I/O Assy?
No
Yes
Check around IC7605, IC7606,
and IC7607 on the AV I/O Assy,
and the connection between the
AV I/O Assy and AUDIO AMP Assy.
AV I/O Assy
=
AV I/O Assy
-
A
A
A
