Sharp PG-A20X Serviceanleitung Seite 36

PG-A20X
No colour or unusual
tone(NTSC, PAL)
Are there RGB outputs at
pins (23)(R-Y), (22)(B-Y) of
IC3105?
YES
Check C3126 and C3124.
No or unusual Y signal
Are there RGB outputs at
pins (21)(Y) of IC3105?
YES
Check C3121.
Checking IC3102 (RGB
signal output circuit)
Are there signal outputs at
pins (66)(R-Y), (68)(B-Y),
(69)(Y) of IC3102 ?
YES
Are there RGB outputs
waveforms at pins(35),
(37) and (39) of IC3102 ?
YES
Are there output
waveforms at the emitters
of Q3110, Q3111 and
Q3112?
NO
Check IC3105 and its
peripheral circuits.
NO
Check IC3506 and its
peripheral circuits.
NO
Go to "No colour or unusual
tone", "No Y signal" or "Out
of sync"
NO
Check the data transfer and
other performance at pins
(55) and (56) of IC3102.
NO
Check Q3110 thru Q3112
and their peripheral circuits.
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