Read Sharp XG-NV7XE (serv.man3) Service Manual online
35
XG-NV7XE
XG-NV7XM
TROUBLE SHOOTING TABLE
(Continued)
No audio output
Yes
No
Check the input, the switching circuit
of IC3301 and IC3302, and their
peripheral circuit.
of IC3301 and IC3302, and their
peripheral circuit.
Is there audio signal inputs at pin (2)
of IC302?
of IC302?
Yes
No
Check the IC5201 control voltage,
and its peripheral circuits.
and its peripheral circuits.
Is there audio signal outputs at pin (7)
of IC302?
of IC302?
Yes
No
Check IC301 and its peripheral
circuits.
circuits.
Is there audio signal outputs at pin (6)
of IC301?
of IC301?
Check IC301 and its peripheral
circuits, and the SP connectors and
speakers.
circuits, and the SP connectors and
speakers.
If the voltage at pin (7) of IC301 is
not as specified, check Q302, Q303
and their peripheral circuits.
not as specified, check Q302, Q303
and their peripheral circuits.
Checkig the Power Unit
There are no voltage output at
PA and PB connector.
PA and PB connector.
No
No
No
Yes
Yes
Are PA and PB connector
disconnected or loose?
disconnected or loose?
Reconnect the PA and PB
connector.
connector.
Replace AC Power Switch
(QCNW-5413 CEZZ).
(QCNW-5413 CEZZ).
Replace Power Unit.
Are AC power switch
(QCNW-5413CEZZ) and
bimetal nomal?
(QCNW-5413CEZZ) and
bimetal nomal?
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