Service manual
XG-XVI
WA
TROUBLE SHOOTING TABLE
(Continued)
:
Checking the
XGA’s
red video circuit and
its peripheral
circuits
I
Checking the VGA’s
red video circuit and
its peripheral
circuits
I
Is there signal at pin (13) of
IC8004?
No
+
Is there signal at pin (13) of
IC8004?
----we----------_
Yes
I
I
LCP circuitry faulty.
----No
Is there signal at pin (3) of
IC8008?
‘----------------I
No
+
Is there signal at pin (3) of
IC8008?
Yes
I
I
IC8004
or its peripheral circuit faulty.
I
I
---------------__
Is there signal at pin (6) of
IC8011
No ------ -------___I No
.
+
Is there signal at pin (6) of
IC801
l?
----------_______
I
I
IC8008
or its peripheral circuit faulty.
I
AretheresignalsatRllAOthru-7
NO
----------------
and Rl 1
BO
thru -7 of
lC8025?
+
-------mm-------_
Yes
I
I
IC8011
or its peripheral circuit faulty.
I
--------------__
Are there signals at Rl2AO thru -7
and RI
2B0
thru -7 of
lC8025?
I
I
Yes
I
KC8020
or its peripheral circuit faulty.
f
I
----------------
I
*
Are there signals at
Rl
thru -10 and No
Gl thru -10 of
IC8030?
Yes
----------------_
I
I
f
lC8025 or its peripheral circuit faulty. ,
I
No
----------------I
--_-------------_
I
I
I
IC8030
or its peripheral circuit faulty. ,
I
No
----------------I
Check the video
--__------------_
i
Q13,
Q14 thru Q17 or their peripheral
t
, parts faulty.
system’s red video
I
circuit and its
f
TC2 connector or output PWB faulty.
--__------------
I
,
I
peripheral circuits
---_-----------_
I
No
Are there signals at VBRO thru -7 of
IC8020?
I
I
I
R8275,
R8276 or LCP circuitry faulty. ,
1
Yes
I
----------------
0
i!
32