Dram Test; Parallel Wrap Test - Lexmark C920 Service Manual

5056-XXX

DRAM Test

The DRAM Test is used to check the validity of both the printer's standard and optional DRAM. The test involves
writing patterns of data to DRAM to verify that each bit in memory can be set and read correctly.
When a user selects this test, the panel displays "DRAM Test Testing...", then posts "Resetting the Printer" and
automatically performs a POR.
After the POR, the panel displays the following:
"P" represents the number of times the DRAM has passed the test, and "F" represents the number of times the
DRAM has failed the test.
The largest number that is displayable by either field is 999,999. Initially, only 4 digits appear for "F"; a fifth and
sixth digit will appear if required.
Each time the printer finishes a test, it increments "P" or "F" by one according to the success or failure of the
DRAM.
While the DRAM test executes, the power indicator light blinks green. The only way a user can stop this test
before its completion is to turn the printer off. If the test is not canceled, it automatically stops executing when all
of the printer's standard and optional DRAM has been tested.

Parallel Wrap Test

This test verifies the proper functioning of the parallel port hardware using a wrap plug. Each parallel signal is
tested.
To perform this test, follow these steps:
1.
Disconnect the parallel interface cable, and install the parallel wrap plug.
2.
Select "HARDWARE TESTS" from the Diagnostics Menu.
3.
In the HARDWARE TEST menu, select the appropriate parallel port option for testing.
When a user selects this test, the panel displays the following:
"P" represents the number of times the parallel port hardware has passed the test, and "F" represents the
number of times it has failed the test. The largest number that is displayable by either field is 999,999. Initially,
only 4 digits appear for "F"; a fifth and sixth digit will appear if required. Each time the printer finishes a test, it
increments "P" or "F" by one according to the success or failure of the parallel port hardware. While the parallel
port hardware test executes, the power indicator light blinks green. A user can cancel this test by pressing Stop.
When a test is canceled, the panel returns to the main HARDWARE TESTS menu. Or, when the maximum
number of tests has been executed, the test stops and displays the results.
3-10
Service Manual