No Audio Output - Sharp XG-V10XU Service Manual

XG-V10XU
TROUBLE SHOOTING T ABLE

No audio output

Are there audio signal inputs at pins
(2) and (23) of IC301?
Are there audio signal outputs at pins
(3) and (6) of IC302?
If the voltage at pin (7) of IC302 is not
as specified, check Q302, Q303 and
their peripheral circuits.
Checkig the Power Unit
There is no voltage output at
EA connector.
Is EA connector disconnected
or loose?
Is AC voltage (85-264V)
applied across the BA
connector?
No
Yes
No
Yes
Check IC302 and its peripheral
circuits, and the SP connectors and
speakers.
No
Yes
No
No
Yes
No
Is R727 broken?
Yes
Replace R727 or Q701.
(Continued)
Check the input, the switching circuit
of IC403 and IC404, and their
peripheral circuit.
Check IC302 and its peripheral
circuits.
Reconnect the EA connector.
Replace F1701.
There is a short-circuit along
the EA output line. Using a
tester, check the resistance
between each voltage line and
the ground.
46