Read Sharp XV-Z12000 (serv.man12) Service Manual online
47
XV-Z12000
IC8004 peripheral check
Set the signal generator to output
a RAMP signal.
a RAMP signal.
IC8004 is defective.
YES
NO
Is a synchronization signal
present at TL8022, TL8025,
and TL8084?
present at TL8022, TL8025,
and TL8084?
The IC8325 peripheral parts or
IC8025 (CVIC) are defective.
IC8025 (CVIC) are defective.
YES
NO
Check the RAMP signal on
TL8073 - 75 using an oscilloscope.
Is a correct signal being output?
TL8073 - 75 using an oscilloscope.
Is a correct signal being output?
Is the video signal present at
pins (124), (133), and (139) of
IC8004?
pins (124), (133), and (139) of
IC8004?
YES
NO
Is a pulse present at pins (21) -
(88) of IC8004?
(88) of IC8004?
IC8004 is defective.
IC8025 (CVIC) is defective.
YES
NO
NO
Is a clock signal present at
R8128?
R8128?
The IC8004 clock oscillation
circuit or IC8004 is defective.
circuit or IC8004 is defective.
The IC8367 peripheral
circuit or the main unit
is defective.
circuit or the main unit
is defective.
YES
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