Sharp PG-C20XU, PG-C20XE Handbuch Seite 41

Checking the digital signal
processing circuit
Is there 40MHz or so clock
signal at FL8024?
YES
Is there 38kHz or so pulse
(sync) signal at FL8026?
YES
Is there 60Hz or so pulse
(sync) signal at FL8025?
YES
End
NO
Go to "Checking the PLL
circuit".
NO
NO
IC8022, IC8021 or their
peripheral circuit defective.
41
PG-C20XU
PG-C20XE
AN-Z7T