Sdram Memory Test; Rom Memory Test - Lexmark T620 Service Manual

4069-5XX/7XX

SDRAM Memory Test

The purpose of this test is to check the validity of SDRAM, both
standard and optional. The test writes patterns of data to SDRAM to
verify that each bit in memory can be set and read correctly.
To run the SDRAM Memory Test:
1. Select SDRAM Memory Test from the menu.
– The power indicator blinks indicating the test is in progress.
2. Press Return/Stop to exit the test.
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 00000 displays with the maximum
fail count being 99,999.
Once the maximum pass count or fail count is reached, the test is
stopped, the power indicator is turned on solid, and the final results
display. If the test fails, the message SDRAM Error, displays for
approximately three seconds and the failure count increases by 1.

ROM Memory Test

The ROM Memory Test is used to check the validity of the system
board code and fonts.
To run the ROM Memory Test:
1. Select ROM Memory Test from the menu. P and F represent the
same numbers for DRAM.
– The power indicator blinks indicating the test is in process.
The test runs continuously.
2. Press Return/Stop to exit the test.
Diagnostic Aids
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