Preview Display Test (M1700A Only) - HP PageWriter XL M1705B Service Manual

Note ,I
Q?
The disk drive test will fail if the disk is write protected, or if the test
is started when there is no disk in the drive.
Preview Display Test (M1700A Only)
The preview display test checks the preview logic board by writing
data to and reading data from the board. This test also displays
test patterns on the preview screen. Each of the following patterns
appears on the screen for several seconds and in this order:
H checkerboard pattern
H inverse checkerboard pattern
w all black screen
w ver'tical white bar moving left to right
n
horizontal white bar moving top to bottom
n
all white screen
w horizontal black bar moving bottom to top
n
vertical black bar moving right to left
fl all black screen
n
text characters in a white box on the black screen
The message Displaying test pattern . . . appears on the
keyboard display clurin g the time the test pattern is on the preview
screen.
You must observe the preview screen while the test pattern is
running to ensure:
H accurate rendition of all characters and patterns
n
no random lines or clots in the display
n
no permanent patterns visible at normal contrast. Patterns may be
visible at low contrast (darker screen); this is normal.
n
no LCD flickering
If the preview display fails the test or if the test is run when a
preview display is not installed on the M1700A, the message Preview
test failed. appears on the keyboard display.
Note
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If the M1700A is not equipped with a preview display, selecting the
preview display test results in a test failure. If you have selected the
"All" test choice, remove the preview display test from the selected
tests to avoid an erroneous test failure.
Performance Verification and Maintenance 4-5