PG-A20X (serv.man12). Troubleshooting tables - Sharp Projector Service Manual (repair manual). Page 6

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