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Solving Problems
Other Display Problems
•
Screen appears to be rolling or moving
•
Highlighted characters (reversed, underlined, or blinking characters) do not
appear
•
Characters that should appear brighter than others, do not
•
Characters have missing or additional dots (or are strange looking)
•
Characters are replaced with other characters
•
Cursor does not appear or appears in the wrong place
•
Screen images do not appear normal.
If the problem occurs when keys are typed, go to page 5-14.
1
Set the power switch to 0 (Off); wait ten seconds.
2
Set the power switch to
I
(On).
Does the alarm sound once?
Yes
Go to step 3.
No
The video element is failing. Replace the video element. See page
5-20
for instructions.
3
Press and hold the
Ctrl
and
Shift
keys, then press the
Hold
key.
4
Compare all characters of the test pattern shown on page 5-17 with your
screen.
Do all characters match?
Yes
Report this problem to your supervisor.
No
The video element is failing. Replace the video element. See page
5-20
for instructions.
5-12
IBM 3151. Guide to Operations
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