No Audio Output - Sharp XG-NV5XB Service Manual

TROUBLE SHOOTING TABLE

No audio output

Are there audio signal inputs at pin
(2) of IC1411?
Are there audio signal outputs at pin
(2) of P5508?
Are there audio signal outputs at pin
(6) of IC7301?
If the voltage at pin (2) of IC7301 is
not as specified, check Q5501,
Q5502 and their peripheral circuits.
Which output voltage line fails?
-7 P-FAN Vcc
Replace ICP751. Replace R752.
Replace IC702, T701 or Q704.
No
Yes
No
Yes
No
Yes
Check IC7301 and its peripheral
circuits, and the SP connectors and
speakers.
Checkig the Power Unit
There is no voltage output at
EA connector.
Yes
Is there any other output
voltage failure?
No
Is EA connector disconnected
or loose?
No
Is AC voltage (85-264V)
applied across the PA
connector?
Yes
Yes
Is Q704 open?
No
Is there short-circuit between
collector and emitter of Q752?
Yes
Replace Q752. Replace PC702.
37
(Continued)
Check the input, the switching circuit
of IC3303 and IC3304, and their
peripheral circuit,SC3001,SC1502,etc.
Check the IC1411 control voltage,and
its peripheral circuits.
Check IC7301 and its peripheral
circuits.
Yes
Reconnect the EA connector.
No
Replace F701.
No
XG-NV5XB