Sharp PG-F310X Service Manual page 33

Power supply PWB check
Is 13 V applied to pins (2), (3) and (4)
of the connector P704?
YES
Does the lamp turn on?
NO
Are connectors P704 and CN901 fully
inserted?
YES
Is DC voltage of 380 V applied to both
ends of C740?
YES
Is F705 in the OPEN status?
YES
Check circuits F705 and after or
replace F705.
1
Are connectors P701 and P702 fully
inserted?
YES
Is AC voltage between 100 - 240 V
applied to both ends of C702?
YES
Is the bimetal broken?
(Connection between 1 and 2 of
P702)
YES
Is R729 open?
YES
Check that P704 connector pin (11)
is at "H". Replace R729.
NO
1
YES Check the main PWB.
NO Securely insert the connectors.
NO Is pin (11) of the connector P704 at
"H"?
YES
Check peripheral circuits of IC707.
NO Is LAMP-EN/SYNC signal properly
sent to pin (14) of the connector
P704?
(Refer to the waveform chart
YES
Are GATE waveforms of Q901 appro-
priate?
(See waveform diagram
NO Securely insert the connectors.
NO Replace F701.
NO Press the red button on the bimetal.
NO Is F704 open?
YES
Replace F704.
Check that the power supply FAN
FB and FC are not stopped.
5 – 4
NO Check the main PWB.
NO Check the main PWB.
.)
1
NO Check the ballast PWB.
.)
6
NO Check peripheral circuits of IC704.
PG-F310X/XG-F315X