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I
XG-NV4SU
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-5
Checking the S-
VGA's blue video
circuit and its
peripheral circuits
I
Checking the VGA's
blue video circuit
and its peripheral
circuits
I
I
I
NO
Is there signal at pin (3) of IC8004?
Is there signal at pin (3) of IC8004?
Yes
LCP circuitry faulty.
fNo
----------------
Is there signal at the base of Q8004?
1
Is there signal at the base of Q8004?
-_-_I___
Yes
I
I
No
----------------
Is there signal at pin (6) of IC8009?
Is there signal at pin (6) of IC8009?
_-_--_--
Yes
I
I
Q8004 or its peripheral circuit faulty.
I
I
_ - _ _ _ _ _ -
Are there signals at BIIAO thru -7 and
NO
Are there signals at VABO thru -7 of
BIIBO thru -7 of lC8025?
Yes
I
I
IC8009 or its peripheral circuit faulty.
I ----------------
Are there signals at Bl2AO thru -7 and
Bl2BO thru -7 of lC8025?
I
I
I
Yes
I
IC8020 or its peripheral circuit faulty.
I
I ----------------
l
Are there signals at BPAO thru -9 and
NO
BPBO thru-9 of lC8029?
I
-------------m--q
Yes
I
I
l
lC8025 or its peripheral circuit faulty.
I
I
- - - _ _ - - _ _ _ - - _ _ _ -
I
Are there signal at pins (29) thru (38)
NO
I
of IC8018?
-----_--
-----__-
Yes
I
I
l
lC8029 or its peripheral circuit faulty.
I
I
Are there signal at pins (I), (2), (5)
and (6) of SC1405 connector?
Yes
NO
- _ _ _ _ - _ _ _ _ _ - _ _ _ _
I
Check the video
----__-I
-__-__-'I
I
I
I
IC8018 or their peripheral parts faulty.
I
I
----------------
l
system's blue video
circuit and its
peripheral circuits.
+
IS;1405
~o~n~c&~r~~p~t
--q
';;iB
I faulty.
I
_-___-____-_-_--
I
No
I
Are there signals at VBBO thru -7 of
IC8020?
Yes
45
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