Checking The Video Unit Circuit - Sharp XG-V10WU Service Manual

XG-V10WU
AN-SD1U/S422U
TROUBLE SHOOTING TABLE

Checking the video unit circuit

Is there video signal output at pin (7)
of IC1405?
Yes
Is there video signal input at IC4001?
Yes
Are there signal outputs at pins (6)
and (8) of IC4001?
Yes
Check the low-pass and buffer circuits
of Q6008 thru Q6014. Is the signal as
specified?
Yes
Go to "Checking IC801 (RGB signal
output circuit)".
Checking IC801 (RGB signal output circuit)
Go to "No colour or unusual tone",
"No Y signal" or "Out of sync".
No
Check the IC1403, IC1406 selector
switch, terminal voltage and input
circuit.
No
Check the low-pass and buffer
circuits of Q4002, Q4003 and Q4004.
No
Check IC4001 and its peripheral
circuits (bias).
No
Check Q4005 thru Q4008 and their
peripheral circuits.
No
Are there RGB output waveforms at
pins (31), (32) and (33) of IC803?
Yes
Are there output waveforms at pin
1 of Q6801, Q6802, Q6803?
Yes
Are there output waveforms at pin
(8), (10), (12) of SC8404?
Yes
Go to "Trouble shooting table for PC
I/F unit".
42
(Continued)
No
Check the data transfer and other
performance at pins (17) and (18) of
video IC803.
No
Check Q6801, Q6802, Q6803 and
their peripheral circuits.
No
Check IC6801, Q6807,
Q6809 and their peripheral circuits.
Q6808,