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SYMPTOM
20:
The red, green, or blue color does not appear on the screen, or some
characters are missing on the display.
ACTION:
1.
Change the setting of the color
(00/0000)
switch.
2.
Does the missing color appear!
NO
YES
Go to step 3.
Return to normal operation.
3.
Set the I/O switch to 0 (Off).
4.
Make sure the video cable is firmly connected to the logic unit.
NO
YES
Resume normal operation.
Go to step 5.
Video Cable
Figure
2-15.
Video Cable
5.
Set the I/O switch to
(On).
6.
Turn the security key on (fully clockwise).
7.
8.
Set the Test/Normal switch to Test.
Is the Status light continuously blinking!
YES
Go to step 9.
NO
Replace the logic board.
Go to 3.2. nLogic Unit n on page 3-2.
Figure
2-16.
Status Light
9.
Do red, green, and blue appear on the test pattern (see Figure 1-4 on page 1-6)!
YES -- The problem is not in your IBM 3205.
Set the Test/Normal switch back
to Normal.
Check host problem determination procedures.
Invoke your
support structure.
NO
Replace the video unit.
Go to 3.3. "Video Unit" on page 3-6.
Chapter 2. Problem Determination Guide
2-17
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