Read Sharp XG-P20XE (serv.man5) Service Manual online
41
XG-P20XU
XG-P20XE
XG-P20XD
XG-P20XE
XG-P20XD
TROUBLE SHOOTING TABLE
(Continued)
No audio output
Yes
No
Check the input, the switching circuit
of IC461 ~ IC464, and their peripheral
circuit.
of IC461 ~ IC464, and their peripheral
circuit.
Are there audio signal inputs at pins
(2) and (23) of IC331?
(2) and (23) of IC331?
Yes
No
Check the IC331 control voltage,and
its peripheral circuits.
its peripheral circuits.
Are there audio signal outputs at pins
(1) and (2) of P301?
(1) and (2) of P301?
Yes
No
Check IC302 and its peripheral
circuits.
circuits.
Are there audio signal outputs at pin
(4)(6) of IC302?
(4)(6) of IC302?
Check IC302 and its peripheral
circuits, and the SP connectors and
speakers.
circuits, and the SP connectors and
speakers.
If the voltage at pin (7) of IC302 is not
as specified, check Q7055, Q7054
and their peripheral circuits.
as specified, check Q7055, Q7054
and their peripheral circuits.
Checkig the Power Unit
There is no voltage output at
EA connector.
EA connector.
No
No
No
No
Yes
Yes
Yes
Yes
Is EA connector disconnected
or loose?
or loose?
Is TF701 broken?
Is R711 broken?
Is AC voltage (85-264V)
applied across the PA
connector?
applied across the PA
connector?
Reconnect the EA connector.
There is a short-circuit along
the EA output line. Using a
tester, check the resistance
between each voltage line and
the ground.
the EA output line. Using a
tester, check the resistance
between each voltage line and
the ground.
No
Replace F791.
Replace.
Replace R711,R713 or
Q701.
Q701.
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