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XG-NV4SU
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-l
I
Checking the clock circuit and its peripheral circuits
Is X8001 oscillating?
I
X8001 or its peripheral part faulty.
I
+
Yes
---II-----
I
------q
I
Is pin (3) of IC8001 oscillating?
No
Y
I
C8009 or its peripheral part faulty.
l
-----------
-----
I
Yes
Does pin (63) of IC8001 function?
No
I
I
Yes
p
IC8001 or its peripheral circuit faulty.
I
I
--------------
--
I
; Check the sync signal circuit and its
1
I
peripheral circuits.
I
I
---------
------q
Are there signals at pins (275) thru
NO
l
I
(277) of lC8025?
I
LCP circuitry faulty.
I
----------
------
1
Yes
I
1
n
---------------q
Are there signals at pins (141), (145),
NO
I
I
(149) and (150) of IC8020?
Y
lC8025 or its peripheral circuit faulty.
I
I
I
Yes
1
-w-----m
--------
l
No
I
Is the input having a resolution below
I
S-VGA level or in-the video mode?
Yes
----------------
I
I
Are there signals at pins (238) and
NO
I
I
(239) of lC8025?
ti
IC8020 or its peripheral circuit faulty.
I
-----II---
-------
I
I
1
yes
Are there signals at pins (26) and
(28) of SC1405 connector?
4
Yes
No
-3----------1--~
I
I
bl
168025 or its peripheral circuit faulty.
I
I
-----------
-----
I
I
Are there signals at pins (168) thru
I
(172) of lC8029?
lC8025 or its peripheral circuit faulty.
I
.
I
Yes
I
1
----I-I-I
I
---I--q
Are there signals at pins (38) and
(53) of P405?
I
'lC8029 or its peripheral circuit faulty.
I
I
Yes
I
-v
I
-Gi i "&e~i~g~h~P~l-c~c~t
and
1
I
its peripheral circuits".
I
I
41
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