Lexmark X95 series, Service Manual

Page: 375 / 1182

Diagnostic aids
3-23
7558- xxx
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HARDWARE TESTS
Button Test
The Button Test is used to verify the operation of each button on the operator panel.
To perform the Button Test:
1. From the Diagnostics Menu, navigate to
HARDWARE TESTS
.
2. Select
Button Test
. The LCD displays a graphic of the operator panel buttons that matches the layout of
the operator panel buttons.
3.
Press any button on the operator panel. Every time a button is pressed, the equivalent button graphic on
the LCD appears shaded. When the button is released, the shading is removed.
DRAM Test
The DRAM Test is used to check the validity of both the device’s standard and optional DRAM. The test involves
writing patterns of data to DRAM to verify that each bit in memory can be set and read correctly.
To run the DRAM Test:
1.
From the Diagnostics Menu, navigate to
HARDWARE TESTS
.
2.
Select
DRAM Test
.
DRAM Test Testing...
appears on the LCD, and then
Resetting the Printer
appears. The printer automatically performs a POR.
The following type of message appears:
• P:
######
represents the number of times the memory test has passed and finished successfully.
Initially 000000 displays with the maximum pass count being 999,999.
•
F:
#####
represents the number of times the memory test has failed and finished with errors. Initially
0000 displays with the maximum fail count being 99,999. Initially only four digits appear, but
additional digits appear as needed.
To stop this test before completion, turn the printer off.
Panel Test
After a user chooses this setting, the device automatically executes the operator panel test application which
occupies the entire display panel. The test application automatically toggles each pixel in the display panel
through every contrast level, beginning with the darkest (every pixel turned on and as dark as possible) and
ending with the lightest (every pixel turned off). The panel then illuminates the backlight, and then it turns off.
Essentially, this test identifies any non-functioning pixels, since these appear as blank spaces during the test’s
darker stages.
This test is run by navigating to
HARDWARE TESTS
and then selecting
Panel Test
.
Serial Wrap 1 Test
The Serial Wrap Test is used to check the operation of the serial port hardware using a wrap plug. Each serial
signal is tested.
DRAM Test 256MB P:###### F:####