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VIDEO HAP 0300
PAGE
1 OF
ENTRY POINTS
FROM
ENTER THIS MAP
MAP
ENTRY
PAGE
STEP
NUMBER
POINT
NUMBER
NUMBER
0100
A
1
001
0100
BB
4
036
0100
CC
2
008
0400
A
1
001
001
[ENTRY POINT AI
-Set the TEST/NORMAL switch to TEST.
-Engage Intensity Override.
(Turn the
brightness knob fully counterclockwise.>
You should see all 3 colors (red, green
and blue) in some areas around the edge OT
the screen - as in Figure 2-1.
can you see all the 3 colored rasters ?
Y N
002
Are only one Or two colored rasters
visible? (No characters.)
Y N
003
The following symptoms in Intensity
Override should not prevent the
display from operating normally:
(a) Only 2 of the 3 rasters visible
and some dim characters just
visible.
(b) The rasters do not appear and any
characters remain in view.
Have you got either of these problems?
Y N
004
-Release Intensity Override.
GO TO PAGE 4, STEP 036,
ENTRY POINT BB.
005
-If
symptom (a) is present,
exchange
the video card.
-For symptom (b), probe the VIDEO
FORCE signal on the video card (Test
Point GT. Figure
6-9).
The signal should normally be UP and
should go DOWN when Intensity Override
15 engaged.
Does this occur?
Y N
2 2
B C
006
-Switch power OFF
~
-See Figure 6-7 to trace the VIDEO
FORCE signal.
-See Figure 6-7 to verify the
continuity of the connections to
the Intensity Override switch on
the brightness potentiometer.
-If you find no problem, exchange
the analog card.
GO TO MAP 0000, ENTRY POINT BB.
Copyright IBM Corp 1981
HAP 0300-1
EXIT POINTS
EXIT THIS MAP
TO
PAGE
STEP
MAP
ENTRY
NUMBER
NU~lBER
NUMBER
POINT
017
0800
DD
04FEB81
HAP 0300-1
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