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XG-NV4SU
I
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-4
Checking the S-
Checking the VGA's
VGA's green video
green video circuit
circuit and its
and its peripheral
peripheral circuits
circuits
I
I
Is there signal at pin (8) of IC8004?
No
&
r
Is
there signal at pin (8) of IC8004?
_--------------I_
Yes
I
I
LCP circuitry faulty.
Is there signal at the base of Q8006?
L
Is there signal at the base of Q8006?
Yes
IC8004 or its peripheral circuit faulty.
l
I
Is there signal at pin (6) of IC8010?
Yes
--------
I
I
Q8006 or its peripheral circuit faulty.
I ----------------
Is there signal at pin (6) of IC801 O?
1
Are there signals at
GII A0
thru -7 and
NO
No
Are there signals at VARO thru -7 of
GII BO thru -7 of lC8025?
IC8020?
I
I
Yes
I
---III--
L
-------'I
I
I
I
I
Yes
I
IC8010 or its peripheral circuit faulty.
I
I
Are there signals at Gl2AO thru -7 and
Gl2BO thru -7 of lC8025?
I
I
I
I
Yes
I
IC8020 or its peripheral circuit faulty.
I
I ----------------
l
Are there signals at GPAO thru-9 and
NO
GPBO thru-9 of lC80292
_-------
----_---
Yes
I
I
l
lC8025 or its peripheral circuit faulty.
I
I
- - - - - - - - - - - - - - _ -
I
Are there signals at pins (18) thru (27)
NO
of IC8018?
------
-------_
Yes
I
I
l
IC 8029 or their perpheral parts faulty.
I
- - - - - _ _ - _ _ _ - - - - _
I
Are there signals at pins (9), (IO), (13)
NO
and (14) of SC1 405 connector?
Check the video
-_-_----
zI-------'I
I
I
ICI 018 or their peripheral parts faulty.
I
system's green
video circuit and its
----I-----------
l
,peripheral circuits
_&I;&
,ink&iriuipit
i;B
-0'1
I
faulty.
k
___----------_--
I
No
I
Are there signals at VBGO
thru -7 of
IC8020?
Yes
44
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