Read Sharp XG-NV4SE (serv.man5) Service Manual online
41
XG-NV4SE/SM
XG-NV40SA
XG-NV40SA
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-3
Yes
Yes
No
No
Is there signal at pin (13) of IC8004?
Is there signal at pin (13) of IC8004?
LCP circuitry faulty.
B
B
Yes
Yes
No
No
Is there signal at the base of Q8008?
Is there signal at the base of Q8008?
IC8004 or its peripheral circuit faulty.
Yes
Yes
Yes
No
No
Is there signal at pin (6) of IC8011
Is there signal at pin (6) of IC8011?
Q8008 or its peripheral circuit faulty.
Yes
No
No
Are there signals at RI1A0 thru -7 and
RI1B0 thru -7 of IC8025?
RI1B0 thru -7 of IC8025?
Are there signals at VAR0 thru -7 of
IC8020?
IC8020?
IC8011 or its peripheral circuit faulty.
Yes
No
Are there signals at RI2A0 thru -7 and
RI2B0 thru -7 of IC8025?
RI2B0 thru -7 of IC8025?
IC8020 or its peripheral circuit faulty.
Yes
Yes
No
Yes
No
Are there signals at RPA0 thru-9 and
RPB0 thru-9 of IC8029?
RPB0 thru-9 of IC8029?
Are there signals at pins(17), (18), (21)
and (22)of SC1405 connector?
and (22)of SC1405 connector?
Are there signals at pins (5) thru (14) of
IC8018?
IC8018?
IC8018 or their peripheral parts faulty.
No
IC8029 or its peripheral circuit faulty.
SC1405 connector or output PWB
faulty.
faulty.
Checking the S-
VGA's red video
circuit and its
peripheral circuits
VGA's red video
circuit and its
peripheral circuits
Checking the VGA's
red video circuit and
its peripheral
circuits
red video circuit and
its peripheral
circuits
Yes
No
Are there signals at VBR0 thru -7 of
IC8020?
IC8020?
Check the video
system's red video
circuit and its
peripheral circuits
system's red video
circuit and its
peripheral circuits
IC8025 or its peripheral circuit faulty.
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