Hardware Tests - Lexmark C91x Service Manual

5055-xxx

Hardware tests

LCD Hardware Test
The LCD Hardware Test causes the printer to continually execute
the LCD display test. To cancel the test, press Return or Stop.
Button Test
The Button Test verifies the operation of each button on the operator
panel. When Button Test is selected, the following appears on the
display:
When a button is pressed, CL (Closed) displays. When a button is
not pressed, OP (Open) displays. If the wrong message displays, the
button is malfunctioning. To exit the button test, press Return or
Stop.
DRAM Memory Test
The DRAM Memory Test checks the validity of DRAM (both standard
and optional). Patterns of data are written to DRAM verifying each
bit in memory can be set and read correctly. When selecting this test
from the operator panel, the printer begins testing DRAM memory
and the following message is displayed:
Terminology:
P:###### represents the number of times the memory test finishes
successfully. Initially 000000 displays for ######. The maximum
pass count is 999,999.
F:##### represents the number of times the memory test finishes
with errors. Initially 00000 displays for #####. The maximum fail
count is 99,999.
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Service Manual
OP OP OP OP
OP OP
DRAM Memory Test
P:##### F:#####