Dram Test; Serial Wrap Test - Lexmark X792 Service Manual

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DRAM Test

This test checks the validity of DRAM, both standard and optional. The test repeatedly writes patterns of data to
DRAM to verify that each bit in memory can be set and read correctly.
To run the DRAM Test:
From the Diagnostics menu, navigate to:
HARDWARE TESTS > DRAM Test
DRAM Test Testing... appears on the screen, followed by Reseting the Printer.
After the printer resets, the results of the test appear: DRAM Test (x)MB P:###### F:######.
(x) represents the size of the installed DRAM.
P:###### represents the number of times the memory test has passed and finished successfully, with the
maximum pass count being 999,999.
F:##### represents the number of times the memory test has failed and finished with errors, with the maximum
fail count being 999,999.
Once the maximum pass count or fail count is reached, or once 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.
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
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
FIFO Error
DSR Error
DSR PIO Error
DSR Interrupt Error
CTS Error
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