Lexmark X734DE, Руководство по обслуживанию

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3-16
Service Manual
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DRAM Test
This test checks 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 Test:
1.
Touch
DRAM Test
from HARDWARE TESTS in Diag.
2.
The MFP turns off and re-starts (POR), and then the power indicator
blinks
, indicating the test is in
progress.
The following counter appears:
DRAM Test xxx MB P:000000 F:0000
To interpret the test:
•
xxx
MB indicates the amount of DRAM memory the MFP has detected.
• P:###### represents the number of times the memory test has passed and finished successfully. Initially,
000000 displays with the maximum pass count being 99,999.
•
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 turns on solid,
and then the final results appear. If the test fails, SDRAM Error appears for approximately three seconds and the
failure count increases by 1.
Note:
If you need to exit the test before it is complete, turn off the printer.
Serial 1 Wrap
The Serial 1 Wrap Test is used to check the operation of the serial port hardware using a wrap plug. Each serial
signal is tested.
To perform the Serial 1Wrap Test:
1.
Disconnect the serial interface cable, and then install the serial wrap plug.
2.
Touch
HARDWARE TESTS
from the Diag Menu.
3.
Touch
Serial 1 Wrap
.
The power indicator
blinks
indicating the test is in progress. The following messages appear
Serial Wrap [x] Testing…
Resetting the Printer
Upon completion of the POR, the following message is displayed:
Serial Wrap P:000000 F:0000
4.
The test will stop when it reaches the maximum values, or press
Stop
( ) to end the test before it is
complete.
To interpret the test:
P:###### represents the number of times the serial port hardware has passed.
Initially, 000000 is displayed. The maximum pass count is 999,999.
F:###### represents the number of times the serial port hardware has failed.
Initially, 0000 is displayed. The maximum fall count is 999,999.