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FORM 50.40-OM2
99YORK INTERNATIONAL
Each of the Display Diagnostics is accessed from this
screen. After each diagnostic is performed, return to
this screen, from which the next diagnostic can be
selected. Refer to description of Display operation in
Section 5 of this book.
PROCEDURE
1. Press the appropriate keypad key to perform the
desired test from the list below.
2. Press the CANCEL (X) or ENTER (T) key to
terminate test and return to DISPLAY TEST MAIN
Screen, from which another test can be selected.
3. When all the desired tests have been performed,
press the DIAGNOSTICS key to return to the
MAIN DIAGNOSTICS Screen.
• Bit Patterns - This test is used to detect
jitter and alignment defects. It veries proper
operation and compatibility of the Microboard
Display Controller with the display. Four
vertical bars of green, dark blue, light blue and
yellow, outlined by a red border are displayed.
If the vertical bars are not stable or straight, or
the red border is not completely visible, then
either the Microboard Program Jumpers are not
congured correctly for the installed display or
the Microboard Display controller is defective.
Refer to Figure 51.
• All Red - This test veries the operation of all
of the red pixels. All of the red pixels are turned
on to create a completely red screen. Any red
pixels that do not turn on will appear as black
dots on the display. If any black dots appear, rst
ascertain it is not caused by dirt that is lodged
between the display surface and the protective
plastic cover. It is normal for a small number of
randomly spaced pixels to not illuminate. It is not
necessary to replace the display if a small number
of black dots appear. They will not be visible
on the normal screens displayed outside of this
diagnostic mode. However, large black areas
would be indicative of a defective display.
• All Green - This test verifies the operation
of all of the green pixels. All of the green
pixels are turned on to create a completely
green screen. Refer to description of “All Red”
test above.
• All Blue - This test veries the operation of
all of the blue pixels. All of the blue pixels are
turned on to create a completely blue screen.
Refer to description of “All Red” test above.
• All White - This test veries the display’s ability
to turn on all pixels to display a completely
white screen. Any pixel that does not turn on
will appear as a black dot. Refer to description
of “All Red” test above.
• All Black - This test veries the display’s ability
to turn off all pixels to display a completely
black screen. Any pixel that does not turn off
will appear as a red, green, blue or white dot.
Refer to description “All Red” test above.
DISPLAY TEST
FIG. 50
00528VIPC
5