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IBM 3279 2A Maintenance Manual page 59

Color display terminal maintenance analysis procedures
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ABC D E
1 1 1 1 1
VIDEO OUTPUT RPQ "AP
PAGE
2
OF
5
107
-Inspect the cable in position C4.
'Inspect the VIDEO CONTROL switch.
.Exchange any failing
FRU.
GO TO PAGE
5,
STEP 057,
ENTRY POINT FF.
008
GO TO PAGE
5,
STEP 057,
ENTRY POINT FF.
009
'Set the VIDEO CONTROL switch to
NORMAL or ENHANCE.
GO TO PAGE
1,
STEP 001,
ENTRY POINT A.
10
.Verify that the control unit is
connected and working.
eGo to the General Failure Index CMIM
section 2.2>,
11
.Press the '/' key.
DOeS a '/' appear on the screen?
i
y
;~2TO
MAP 0700, ENTRY POINT EE.
13
'Press ENTER .
The pattern shown in Figure 2-4 (Online
Test
0)
should display.
Are the COLORS correct?
(Ignore any other
di fferences.)
i
y
;~4TO
MAP 0500, ENTRY POINT A.
15
.Observe the SIGNAL TEST lamp located on
the· rear panel.
IS
it off?
I
y
:16
~gm~oi~Ag~'3,
STEP
026,
ENTRY POINT BB.
17
'Set the VIDEO CONTROL switch to TEST.
'Observe the SIGNAL TEST lamp.
Is
it on?
Y N
F
018
GO TO PAGE 3, STEP
026,
ENTRY POINT BB.
F
"AP 1000-2
I
019
-Compare the picture on the 3279 screen
with Figure
2-4.
Video signals normally sent to the monitor
are now displayed on the 3279 screen.
-Check the image for missing or wrong
colors.
Are the colors OK?
Y N
020
-Exchange logic card C2.
GO TO PAGE 5, STEP 057,
ENTRY POINT FF.
021
-Check the
i
mage for di stort
i
on.
Is the image OK?
Y N
022
'Set the VIDEO CONTROL switch to NORMAL.
Is the image OK?
Y
I
;~!turn
to the General Failure Index
to determine correct MAP entry point.
024
.Exchange logic card C2.
GO TO PAGE
5,
STEP
057,
ENTRY POINT FF.
025
GO TO PAGE
4,
STEP
039,
ENTRY POINT CC.
04FEB81
MAP 1000-2

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