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XG-NV4SU
I
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-2
Checking the PLL circuit and its peripheral circuits
Are there signals at pins (4) and (5) of
No
lC8026?
Yes
---------
I
---l--q
I
1
lC8025 or its peripheral circuit faulty.
I
I
-ll-----lll
I----
l
Is there signal at pin (236) of lC8025?
No
Yes
1
lC8026 or its peripheral circuit faulty.
1
I
- - - - - - - - - - - - - - -
,I
Are there signals at pins (6) and (22)
NO
of IC8015?
Yes
------I
I
-----
--q
I
I
lC8025 or its peripheral circuit faulty.
1
I
.
I
-I
Are there signals at pins (18) and (19
No
- - - - - - - - - - - - - - -
of IC8015?
1 Yes
l
-----------
--l-q
I
t IC8015 or its peripheral circuit faulty.
1
I
-------
l
0-q
Check the video_iiit
andits
- - - - - - - - - - - - - - - -
I
I
1
I
peripheral circuits.
I
I
Is image as specified at resolution
above S-VGA level?
NO
l Yes
- --
t
1
Check the S-VGA video circuit and its;
peripheral circuits.
-----------
----I
l
Is image as specified at resolution
NO
below S-VGA level?
1
Yes
I
I -checkthe
;Gi
idio_iiit
andits
7
I
peripheral circuits.
I
---------II
-II---
l
I
Hook up a video system. Is the
No
display as specified?
1
Yes
I-I----~---
I
--q
I
Check the video system'svideo
1
I
circuit and its peripheral circuits.
1
.
-------III
I-I---
l
42
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