IBM 3278 Series Maintenance Information page 26

Symptom Action
5. Displays fu II
(0)
A1E2
raster with
A1H2
intensity set to A1F2
normal (cursor
may also display);
or each character
position displays
the fu II character
space.
6.
Displays one of A1F2
the following:
A1G2
•
Divider Line
only
•
Divider Line
and a line at
bottom of
screen
•
Random data
after power on
•
Test pattern
when online
7.
Cursor flashes at A1G2
random locations.
A1F2
8. Display size
Reseat/swap the high-voltage
changes when
power supply. (See par. 6.2.5.1
intensity is
changed.
9. Display ti Ited or Adjust the yoke or analog card
incorrect size. potentiometers. (See par. 5.1.1
10. Cursor missing, Verify with the Normal/Test
will not blink or switch in the Test position.
reverse.
Check the analog card adjust-
ment (see Chapter 5).
A1F2
(0) A1E2
A1G2
11. Normal/Test
A1G2
switch operation A1H2
failure.
Check the switch and cables.
(See Figure 4-13.1
12. Monocase (0) A1E2
(A,a/A)
A1G2
switch operation
Check the switch and cables.
failure.
(See Figure 4-13.1
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