Sharp XV-Z12000 Anleitung Seite 47

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