CTX CMS-3436 - Sync Processing and Video Preamp Checks

C. VIDEO CIRCUIT SERVICE
(1)
(2)
(3)
Check each connection to the CRT.
The three channels for R G B video AMP. are identical,so it’s convinent to compare the fault one with
the normal channel and find the fault location.
If all three channels are not normal, please check the 99V for the output AMP.and the 12V for preamp,
then check blanking Q703,Q704 and contrast, brightness control circuit.
CHECK I/P
SIGNAL
CN401, SIGNAL CABLE, FD401 ~ FD402
SIGNAL SOURCE
ANA / TTL SW, IC 401, IC 402
Q405~407, Q409~411
Q413~415, Q433, Q401
Q402, FD403,FD401
CHECK TTL
SIGNAL PATH
CHECK ANALOG NO
ANA / TTL SW, H-CONNE
SIGNAL PATH : aad. ae
Q404, Q407, Q504, Q503
CHECK
SYNC
SEPARATE
SYNC:
1C404
PROCESSING
SYNC
_ON
G
Gata,
Q419,
Q420
CLAMP
MODE IDENTIFIED :1C405
CHECK VIDEO PREAMP NO
PROCESSING
IC501
Q501, Q502 for ACL
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