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I
I
\
No
No
Is there signal at pin (13) of IC8004?
r
Is there signal at pin (13) of IC8004?
--------
-------'I
I
Yes
I
I
LCP circuitry faulty.
I
No
Is
there signal at the base of Q8008?
Yes
Is there signal at the base of Q80087
1
--I-III-l
I
I
IC8004 or its peripheral circuit faulty.
I
I
No
_-III
-I-I-I----I
No
Is there signal at pin (6) of IC8011
Is there signal at pin (6) of ICSOI I?
Yes
I
I
I
- - - -
i....;
LqjIIl
--------
Q8008 or its peripheral circuit faulty.
I
\
/
--II--I-----
Are there signals at
RI1
A0
thru -7 and
NO
No
A
Are there signals at VARO thru -7 of
RIlBO thru -7 of lC8025?
IC8020?
\
-I-I-I-I
---m---q
4
Yes
I
I
I
IC8011 or its peripheral circuit faulty.
I
I I---II----I-II-I
'
NO
Are there signals at Rl2AO thru -7 and
1
,XG-NV4SU
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-3
\
Checking the S-
Checking the VGA's
VGA's red video
red video circuit and
circuit and its
its peripheral
peripheral circuits
circuits
I
I
Yes
I
IC8020 or its peripheral circuit faulty.
I
I IIIIIIIIIII-IIIII
I
Are there signals at RPAO thru-9 and
NO
RPBO thru-9 of lC8029?
II-III-I
----II--~
.
L
Yes
I
l
lC8025 or its peripheral circuit faulty.
I
I
.
I
Are there signals at pins (5) thru (14) of No
IC8018?
--------
-------q
Yes
'
I
I
'1
lC8029 or its peripheral circuit faulty.
I
I I-I-III--II--III
I
Are there signals at pins(l7), (18), (21)
NO
and (22)of SC1 405 connector?
,
----m--q
Yes
I
I
l
IC8018 or their peripheral parts faulty.
I
Check the video
system's red video
circuit and its
peripheral circuits
I SC1405 connector or output. PWB
No
Are there signals at VBRO thru -7 of
I
faulty.
IC8020?
IIIIII-IIIIII-I--
I
I Yes
43
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