Lexmark 5021-0XX - Manual (Page 219)

Diagnostic aids 3-11
5021-0XX
Once the maximum pass or fail count is reached, the test stops
and the final results display on the screen.
DRAM memory test
The purpose of this test is to check the validity of DRAM, both
standard and optional. The test writes patterns of data to DRAM to
verify that each bit in memory can be set and read correctly.
To run the DRAM memory test:
1. Select DRAM Test from the menu.
The power indicator blinks indicating the test is in progress.
2. If you need to stop the test before it finishes, turn the printer off.
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 time the memory test has failed and
finished with errors. Initially 00000 displays with the maximum
fail count being 99,999.
Once the maximum pass count or fail count is reached, the test
stops, and the final results display. If the test fails, the message
DRAM error, displays for approximately three seconds and the
fail count increases by 1.
Serial wrap test
This test is used to check the operation of the serial port hardware
using a wrap plug. Each signal is tested.
To run the serial wrap test:
1. Disconnect the serial interface cable and install the wrap plug.
2. Select the appropriate Serial Wrap Test from the menu.
The following screen displays: serial X wrap P:######
F:######
• X indicates which serial port is being tested,
blank = standard
1 = optional serial port #1
2 = optional serial port #2