XV-C2E (serv.man3). Service manual part two - Sharp Projector Service Manual (repair manual). Page 9

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XV-C2E
23
Yes
Is there horizontal drive signal output
at pin (56) of IC801?
No
IC801 defective.
Are video signal at pin (21) or (29) of
IC801 and horizontal drive signal at
pin (56) of IC801 in sync with each
other?
Yes
No
Check pins (58) and (59) of IC801
and their peripheral circuits.
Is there horizontal drive signal output
at pin (9) of IC503?
Yes
No
Check IC503, IC501 and their
peripheral circuits.
Is there horizontal drive signal input
at pin (72) of IC4101?
No
Check IC4107 and its peripheral
circuits.
Yes
Is there horizontal drive signal input
at pin (13) of IC4302?
No
See if SC4302 is properly soldered.
Yes
Check IC4302 and its peripheral
circuits (PLL section).
TROUBLE SHOOTING TABLE
(Continued)
No horizontal sync
Remove Q1701. Does fuse F1701
blow out again?
No
No lamp light-up
Install Q1701 back in position. Does
the fuse melt down?
No
No
Is discharging noise heard?
Yes
Yes
Yes
Check the trigger circuit.
 Power unit defective.
Replace T1702 or the lamp.
Check Q1701, L1701 and their
peripheral circuits.
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