IBM 3278 Series Maintenance Information page 27

Symptom
Action
13. Incorrect
A1G2
characters
A1F2
display and
Device Check
is indicated
(Machine
Check =X 771.
14.
Incorrect
(D)
A1E2
characters
A1G2
display with- A1F2
out Device
Check; or
extra or miss-
ing dots on
screen.
If in APL/Text
Reseat/swap ROS module in
mode only
01A/A102
(0)
or 01A/A1E2 (M)
(0)
A1D2or
(M)
A1E2
If PS characters Reseat/swap RAM modules
only.
01A/A1C2
(0)
Reseat/swap RAM modules
01A/A 102
1M)
Reseat/swap 01A/A 1C2, D2
(0)
Reseat/swap 01A/A 1 D2, E2
(M)
15. Test Mode 1 A1G2
characters
(0) A1E2
i nco rrect
0
n A1F2
half or all of
the screen, or
in incorrect
sequence.
16. Will not change
A1F2
row length
A1H2
(Model 50nlyl.
17.
Keyboard not (0)
A1G2
working, input (M)
A1F2
inhibit not
Set the Normal!Test switch to
indicated.
the Test position, and try to
Characters do
enter from the keyboard. If you
not enter.
cannot enter, swap the keyboard
logic card. Verify keyboard
cables (Figure 4·161.
SY27-2510-6
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