Sharp PG-F320W - Notevision WXGA DLP Projector, Service Manual

Page: 32 / 144

PG-F320W
5 – 4
Power supply PWB check
Is 13 V applied to pins (2), (3) and (4)
of the connector P704?
NO
YES
Does the lamp turn on? YES Check the main PWB.
NO
Are connectors P704 and CN901 fully
inserted? NO Securely insert the connectors.
YES
Is DC voltage of 380 V applied to both
ends of C740? NO Is pin (11) of the connector P704 at
“H”? NO Check the main PWB.
YES
YES
Check peripheral circuits of IC707.
Is F705 in the OPEN status? NO Is LAMP-EN/SYNC signal properly
sent to pin (14) of the connector
P704?
(Refer to the waveform chart .)
NO Check the main PWB.
YES YES
Check circuits F705 and after or
replace F705. Are GATE waveforms of Q901 appro-
priate?
(See waveform diagram .)
NO Check the ballast PWB.
Are connectors P701 and P702 fully
inserted?
NO Securely insert the connectors.
YES
Is AC voltage between 100 - 240 V
applied to both ends of C702? NO Replace F701.
YES
Is the bimetal broken?
(Connection between 1 and 2 of
P702) NO Press the red button on the bimetal.
YES
Is R729 open? NO Is F704 open? NO Check peripheral circuits of IC704.
YES YES
Check that P704 connector pin (11)
is at “H”. Replace R729. Replace F704.
Check that the power supply FAN
FB and FC are not stopped.
1
1
6
1