Lexmark E450DN Service Manual - Page 72

HARDWARE TESTS, Panel Test, Button Test, DRAM Test

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4512-630 HARDWARE TESTS Select the following Hardware Tests from this menu: • Panel Test • Button Test • DRAM Test • ROM Memory Test • Parallel Wrap (if available) • Serial Wrap (if available) Panel Test This test automatically toggles each pixel of the operator panel through every contrast level beginning with the darkest and on to the brightest. This test continues until you press Stop ( ). Button Test The Button Test verifies the operation of the buttons on the operator panel. When you select Button Test, a diagram of the operator panel appears on the panel. When you press a button on the operator panel, an X appears on the corresponding diagram. When you release the button, an X disappears. Pressing Back ( ) or Stop ( ) cancels the test. DRAM Test The purpose of this test is to check the validity of DRAM memory, 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. Select DRAM Test from the menu. The message DRAM Test Testing... displays. Then the message Resetting Printer appears. The following type of message appears: DRAM Test P:###### xxx MB F:#### • xxx represents the installed DRAM size. • 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, 0000 displays with the maximum fail count being 99,999. Initially, only four digits appear, but additional digits appear as needed. Each time the printer finishes a test, it increments "P" or "F" by 1 according to the success or failure of the DRAM. While the DRAM test executes, the power indicator light blinks green. To stop the test before completion, turn the printer off. 3-14 Service Manual

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3-14
Service Manual
4512-630
HARDWARE TESTS
Select the following Hardware Tests from this menu:
•
Panel Test
•
Button Test
•
DRAM Test
•
ROM Memory Test
•
Parallel Wrap (if available)
•
Serial Wrap (if available)
Panel Test
This test automatically toggles each pixel of the operator panel through every contrast level beginning with the
darkest and on to the brightest. This test continues until you press
Stop
(
)
.
Button Test
The Button Test verifies the operation of the buttons on the operator panel. When you select Button Test, a
diagram of the operator panel appears on the panel. When you press a button on the operator panel, an
X
appears on the corresponding diagram. When you release the button, an
X
disappears. Pressing
Back
(
) or
Stop
(
) cancels the test.
DRAM Test
The purpose of this test is to check the validity of DRAM memory, 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.
Select
DRAM Test
from the menu.
The message
DRAM Test Testing…
displays. Then the message
Resetting Printer
appears.
The following type of message appears:
•
xxx represents the installed DRAM size.
•
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,
0000 displays with the maximum fail count being 99,999. Initially, only four digits appear, but
additional digits appear as needed.
Each time the printer finishes a test, it increments “P” or “F” by 1 according to the success or failure of the
DRAM.
While the DRAM test executes, the power indicator light blinks green. To stop the test before completion, turn the
printer off.
DRAM Test
xxx
MB
P:
######
F:
####