Sharp XG-P25X Service Anleitung Seite 41

TROUBLE SHOOTING TABLE
No audio output
Are there audio signal inputs at pins
(2) and (23) of IC331?
Are there audio signal outputs at pins
(1) and (2) of P301?
Are there audio signal outputs at pin
(4)(6) of IC302?
If the voltage at pin (7) of IC302 is not
as specified, check Q7055, Q7054
and their peripheral circuits.
Replace.
No
Yes
No
Yes
No
Yes
Check IC302 and its peripheral
circuits, and the SP connectors and
speakers.
Checkig the Power Unit
There is no voltage output at
EA connector.
No
Is EA connector disconnected
or loose?
No
Is AC voltage (85-264V)
applied across the PA
connector?
Yes
Yes
Is TF701 broken?
No
Is R711 broken?
Yes
Replace R711,R713 or
Q701.
41
(Continued)
Check the input, the switching circuit
of IC461 ~ IC464, and their peripheral
circuit.
Check the IC331 control voltage,and
its peripheral circuits.
Check IC302 and its peripheral
circuits.
Yes
Reconnect the EA connector.
No
Replace F791.
No
There is a short-circuit along
the EA output line. Using a
tester, check the resistance
between each voltage line and
the ground.
XG-P25X