Lexmark XM1135, Service Manual

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DRAM Test
This test checks the validity of the standard and optional dynamic random access memory (DRAM). The test
repeatedly writes patterns of data to the DRAM to verify that each bit in the memory can be set and read
correctly.
1
Enter the Diagnostics menu, and then navigate to:
HARDWARE TESTS > DRAM Test
2
Testing and resetting the printer messages appear on the display.
3
After the printer resets, the results of the test appear:
DRAM Test [x] P:###### F:######
.
•
[x]
represents the size of the installed DRAM.
• P:######
represents the number of times the memory test passed and finished successfully.
The maximum pass count is 999,999.
•
F:#####
represents the number of times the memory test failed and finished with errors.
The maximum pass count is 999,999.
4
After the maximum pass or fail count is reached or when all the DRAM has been tested, the test stops and
the final results appear.
Serial Wrap Test
Use this test to check the operation of the Serial Port Hardware using a wrap plug. Each signal is tested. If the
test fails, replace the controller board.
To run the Serial Wrap Test:
1
Disconnect the serial interface cable, and install the wrap plug.
2
From the Diagnostics menu, navigate to HARDWARE TESTS > Serial Wrap Test.
3
Select the appropriate Serial Wrap Test from the list. Values may include Serial Wrap , Serial 1 Wrap , Serial
2 Wrap, or Serial 3 Wrap . Each time the test finishes, the screen updates with the result. P and F represent
the same numbers for DRAM. If the test passes, the Pass Count increases by 1. However, if the test fails, one
of the following failure messages appears for approximately three seconds, and the Fail Count increases
by 1:
Receive Status Interrupt Error
Status Error
Receive Data Interrupt Error
Transmit Data Interrupt Error
Transmit Empty Error
Threshold Error
Receive Data Ready Error
Break Interrupt Error
Framing Error
Parity Error
Overrun Error
Data Error
Data 232 Error
Data 422 Error
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