Lexmark X543 Service Manual

Diagnostic information2-47
Lexmark confidential until announce7525xxx
Operator panel display is dim and unchanging
Op panel USB cable service check
USB service check
Step Questions / actions Yes No
1Turn off the printer, and remove the rear shield. 
See “Rear shield removal” on page 4-7. 
Disconnect the cable at JOPP1 on the 
controller board. Verify the following values:
Are all these values approximately correct?Go to step 2. Replace the controller 
board. See “Controller 
board removal” on 
page...

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Networking service check
Note:  Before starting this service check, print out the network setup page. This page is found under Menu - 
Reports - Network Settings. Consult the network administrator to verify that the physical and wireless network 
settings displayed on the network settings page for the device are properly configured. If a wireless network is 
used, verify that the printer is in range of the host computer or wireless access...

Diagnostic information2-49
Lexmark confidential until announce7525xxx
13Try using a different ethernet cable.
Did this remedy the situation?Problem resolved Go to step 14.
14Have the network administrator check the 
network drop for activity.
Is the drop functioning properly?Replace the controller 
board. Go to “Controller 
board removal” on 
page 4-16Contact the network 
administrator.
15Is the printer on the same wireless network as 
the other devices?Go to step 17. Go to step 16.
16Assign the correct...

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Print quality service check
Note:  This symptom may require replacement of one or more CRUs (Customer Replaceable Units) designated 
as supplies or maintenance items, which are the responsibility of the customer. With the customers permission, 
you may need to install a developer (toner) cartridge or photo conductor unit.
Service tip
Before troubleshooting any print quality problems, do the following:
1.Print a menu settings page, and check...

Diagnostic information2-51
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Print quality—background
Service tip: Some background problems can be caused by rough papers, non-Lexmark 
toner cartridges or if the media texture is set to the rough setting.
Some slick or coated papers may also cause background problems. Some problems 
occur with printers that run a large amount of graphics in a humid environment.
Step Questions / actions Yes No
1Read the current status of the imaging unit 
from the customer menus....

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Print quality—blank page
8Clean the printhead.
Does this fix the problem?Problem resolved. Replace the printhead. See 
“Printhead removal” on 
page 4-42.
Step Questions / actions Yes No
1Is all the packing material for the imaging unit 
in question removed?Go to step 2. Remove the packing 
material.
2Print a document that requires all four colors 
with just a few characters to verify if one 
specific color is a problem. For example, print 
the...

Diagnostic information2-53
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4Enter the Diagnostics Menu (turn the printer 
off, press and hold   and  , turn the printer 
on, and release the buttons when installed 
memory and processor speed displays), and 
run the appropriate cartridge drive motor test 
for the missing color:
1. Select MISC TESTS in the Diag Menu, and 
press Select ().
2. Select Motor Detect. 
Remove Cartridge. press Select appears.
Note: Do not press Select yet.
3. Remove all toner cartridges...

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Print quality—blurred or fuzzy print
Run the automatic alignment. The TPS sensor may be damaged. To run Reset Color 
Cal:
1.Enter the Diagnostics Menu. (Turn the printer off, press and hold   and  , turn 
the printer on, and release the buttons when installed memory and processor 
speed displays.
2.Select TPS Setup from Diag Menu, and press Select ().
3.Select Reset Color Cal, and press Select ().
Resetting appears. When the reset is complete,...

Diagnostic information2-55
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Print quality—horizontal line
Either the photoconductor unit or one of the developer units that make up the imaging unit is defective. Remove 
and inspect the imaging unit. Replace the damaged part of the imaging unit. See “Imaging unit (IU) removal” 
on page 4-28. 
Print quality—insufficient fusing
Print quality—missing image at edge
Remove and reseat the following:
Toner cartridge
Imaging unit
Developer units.
Print quality—mottle...

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Print quality—narrow vertical line
Print quality—random marks
Service tip: The primary cause of random marks is due to loose material moving around inside the printer and 
attaching to the photoconductor unit, developer roll, or transfer belt. Step Questions / actions Yes No
1Replace the photoconductor unit. See 
“Imaging unit (IU) removal” on page 4-28. Problem solved. Replace the developer unit. 
See “Developer unit 
removal” on page 4-30...