47
XV-Z12000
IC8004 peripheral check
Set the signal generator to output
a RAMP signal.
IC8004 is defective.
YES
NO
Is a synchronization signal
present at TL8022, TL8025,
and TL8084?
The IC8325 peripheral parts or
IC8025 (CVIC) are defective.
YES
NO
Check the RAMP signal on
TL8073 - 75 using an oscilloscope.
Is a correct signal being output?
Is the video signal present at
pins (124), (133), and (139) of
IC8004?
YES
NO
Is a pulse present at pins (21) -
(88) of IC8004?
IC8004 is defective.
IC8025 (CVIC) is defective.
YES
NO
NO
Is a clock signal present at
R8128?
The IC8004 clock oscillation
circuit or IC8004 is defective.
The IC8367 peripheral
circuit or the main unit
is defective.
YES
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