Read Sharp PG-A20X (serv.man12) Service Manual online
36
PG-A20X
YES
NO
No colour or unusual
tone(NTSC, PAL)
Are there RGB outputs at
pins (23)(R-Y), (22)(B-Y) of
IC3105?
pins (23)(R-Y), (22)(B-Y) of
IC3105?
Check C3126 and C3124.
Check IC3105 and its
peripheral circuits.
peripheral circuits.
YES
NO
No or unusual Y signal
Are there RGB outputs at
pins (21)(Y) of IC3105?
pins (21)(Y) of IC3105?
Check C3121.
Check IC3506 and its
peripheral circuits.
peripheral circuits.
YES
NO
Checking IC3102 (RGB
signal output circuit)
Are there signal outputs at
pins (66)(R-Y), (68)(B-Y),
(69)(Y) of IC3102 ?
pins (66)(R-Y), (68)(B-Y),
(69)(Y) of IC3102 ?
Go to "No colour or unusual
tone", "No Y signal" or "Out
of sync"
tone", "No Y signal" or "Out
of sync"
YES
NO
Are there RGB outputs
waveforms at pins(35),
(37) and (39) of IC3102 ?
waveforms at pins(35),
(37) and (39) of IC3102 ?
Check the data transfer and
other performance at pins
(55) and (56) of IC3102.
other performance at pins
(55) and (56) of IC3102.
NO
Are there output
waveforms at the emitters
of Q3110, Q3111 and
Q3112?
waveforms at the emitters
of Q3110, Q3111 and
Q3112?
Check Q3110 thru Q3112
and their peripheral circuits.
and their peripheral circuits.
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