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IBM 3279 2A Maintenance Manual page 8

Color display terminal maintenance analysis procedures
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B
2
t3
CONTROL MAP
PAGE
3 OF
-If an MSR/MHS is NOT installed. take the
y path now.
-Move the cursor to the first position of
the 5th row.
-Use the MSR/MHS to read the test card.
The green lamp on the MSR/MHS should light
a'nd the cursor move.
(The characters read
from the card mayor may not display.)
X-f
will appear in the indicator row.
Did all OCCUr as expected?
I
v
i~4TO
MAP DaDO. ENTRY POINT EE.
lS
-If ECS or PS (feature cards E2 and F2)
are
NOT
installedl take the Y path now.
-Hold down the
AL
T key. press the CLEAR
key, release both.
-Press keys / a ENTER
The pattern shown in Figure 2-6 (ONLINE
TEST a) should display.
Is the pattern cOrrect?
I
v
~~6TO
MAP DaDo. ENTRY POINT CC.
17
-Set the TEST/NORMAL switch to TEST.
-Press all the keys in turn (except
CONTROL) .
The characters shown in Figure 2-3 (TEST
MODE 2) should appear.
Note the 4 keys
which give double characters.
Are all keys cOrrect?
1 ~~8TO
MAP 0700. ENTRY POINT A.
019
-Set the TEST/NORMAL switch to NORMAL.
·Press any alphanumeric key four or five
times.
Does the clicker sound each time a key is
pressed?
I
;~OTO
MAP 0700. ENTRY POINT A.
021
'Set the TEST/NORMAL switch to NORMAL.
-Hold down the All key, press the TEST
key, release both.
'Press keys / 7 EHTER
A yellow (or red on green) pattern (-±-±-)
shou.ld appear at the center of the screen.
Does this occur?
Y N
022
GO TO MAP 0600. ENTRY POINT A.
c
C
MAP 0100-3
I
023
-Press space bar 26 times, until 13
patterns display together
in
white.
-look for
any
misconvergence.
Do not
mistake misconvergence for bad focus or
bad color balance (impure white).
Is the convergence good?
Y N
I
g~4TO
MAP 0600. ENTRY POINT A.
025
-Set the brightness control fully
clockwise.
Is the display as bright as you would
expect?
I
i~6TO
MAP 0300. ENTRY POINT
BB.
027
[ENTRY
POINT DOl
-Check color purity as follows:
-Set the TEST/NORMAL switch to TEST.
-Press keys CONTROL 0 I (red characters>.
-Jumper D2Y02 to D2Y08 (reverse video).
Do not leave this jumper connected for
more than 20 seconds.
Is the red colOr good over ALL the sCreen?
Y N
028
-Go to MIM section 5.3.2 to adjust the
color purity.
If this corrects the
problem,
GO TO MAP 0000. ENTRY POINT
BB.
If you cannot correct the problem,
GO TO MAP 0300. ENTRY POINT
SS.
029
-Check the color balance as follows:
-Remove the jumper D2Y02 to D2YOa.
-Jumper C2W09 to C2W2a (color bars).
-Jumper C2G06 to C2Doa (force characters).
'Set the TEST/NORMAL switch to NORMAL.
The three primary colors (red, green,
blue) should be equally bright and the
secondary colors distinct, at both high
and low settings of the front panel
BRIGHTNESS control.
Is all cOrrect?
Y N
030
-Go
to MIM
section 5.3.6 to correct the
color balance.
If this corrects the
problem,
GO TO MAP 0000. ENTRY POINT BB.
If
you cannot correct
the
problem,
GO TO MAP 0300. ENTRY POINT CC.
31
-look at the focus in this test pattern.
-Look at both the center of the screen and
the corners.
Is the focus good?
II
4 4
D E
04FEsal
MAP. 0100-3

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