Is a clock signal (20.25 MHz)
present at TL8002?
Supply a RAMP signal to INPUT4,
and observe pins (31 - 40) of
IC8338 using an oscilloscope.
Is a pulse present at pins (31 - 40)
of IC8338?
IC8338 is defective.
IC8025 or after is defective.
IC8338 peripheral check
IC8338 is defective.
Supply a color bar signal to
INPUT4, and observe pins
(41 - 50) of IC8338.
Is a pulse present at pins
(41 - 50) of IC8338?
IC8338 is defective.
Is a clock signal present at
TL8004?
Check X8006, or IC8338 is
defective.
YES
NO
YES
NO
YES
NO
YES
NO
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