Sharp PG-C20XU Service Manual page 40

PG-C20XU
PG-C20XE
AN-Z7T
Checking the video sync
signal
Using the oscilloscope,
measure the signal at
TL8006. (Check the
vertical sync signal.)
Is the vertical sync signal
as specified?
Using the oscilloscope,
measure the signal at
TL8009. (Check the
horizontal sync signal.)
Is the horizontal sync
signal as specified?
Is there 15kHz or so signal
at TP8007?
Is there signal with half the
vertical frequency at
TP8010?
Is there 27MHz or so clock
signal at FL8034?
Is there 13.5MHz or so
clock signal at FL8034?
End
NO
YES
NO
Go to "Checking the input
signal setting".
YES
If out of spec again,
IC8003 or its peripheral
circuit defective.
NO
YES
NO
YES
NO
YES
NO
IC8003 or its peripheral
circuit defective.
YES
40