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Maintenance
6. Select the SINGLE, CONTINUOUS, or STEP
mode, and press ENTER to invoke the desired
mode:
SINGLE Runs the selected test once.
•
CONTINUOUS Runs the selected test re-
•
peatedly.
STEP Runs the test once, pausing after each
•
test sub-section.
7. As the tests cycle, the display will show the mes-
sage
NNN.NN Running M or
NNN.NN Running MC or
NNN.NN Paused MS
where "M" signiÞes "Manual", "MC" signiÞes
"Manual/Continuous", "MS" signiÞes "Manual/
Step", and NNN.NN is the number of the test be-
ing run.
In the STEP mode, press ENTER to move through the
individual tests.
At the conclusion of successful testing the display
should indicate no faults:
All tests complete
Press any key to continue
If a test fails, an asterisk "*" will appear in the top line
of the display, and the second line will advise on fur-
ther steps:
All tests complete *
Press ENTER to review or EXIT
To review the error, press ENTER. The display will
show the test which failed. For further information on
the failure, press INFO. A detailed description of BIT
faults may be found later in this section.
7.6.5 Display test keys
1. Press the MENU key.
2. Select the TEST option and press ENTER.
3. Under the TEST MENU, select the DISPLAY-
TESTS option and press ENTER.
7-10
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4. Under DISPLAY-TESTS, select KEYS and press
ENTER. The display will show "No keys pressed".
5. Press each key (except POWER) in turn and verify
that the corresponding key name is displayed.
6. Verify that the display returns to "No keys
pressed" when each key is released, i.e., no sticking
keys.
7. When you are done with the key test, press EXIT
twice to exit.
7.6.6 Display test patterns
The display PATTERNS test is a visual check of the vac-
uum ßuorescent display (VFD) module. See Figure 7-1.
1. Press the MENU key.
2. Select the TEST option and press ENTER.
3. Under the TEST MENU select the DISPLAY-TESTS
option and press ENTER.
4. Under DISPLAY-TESTS select PATTERNS and
press ENTER.
5. This displays Þve test patterns:
Pattern screen 1
A checkerboard pattern of 18 dots appears for all
20 characters in the top row and 32 characters in
the bottom row. The annunciators will be shown as
in Figure 7-1.
Pattern screen 2
The alternate checkerboard pattern of 17 dots ap-
pears for all 20 characters in top row and 32 char-
acters in the bottom row. The annunciators
disappear and are replaced by the numbers:
1
2
3
4
5
Pattern screen 3
A horizontal bar moves through the seven rows of
the Þrst 5 × 7 character position. One and only one
bar must be visible at a time. Movement will con-
tinue until any key is pressed.
6
7
8
9
10
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