Print Quality Service Check - Lexmark X746de Service Manual

7526
Step Questions / actions
1. Check the cable connection on the system
4
card J1,J3 and J1,J6 on the MDC card for
proper connection.
2. Reseat cable.
Does the error clear?
Check for damages, pinch points and bents
5
on the cable.
Is the cable free of damage?
Replace the MDC card. See
6
card removal" on page
Does this solve the problem?
Replace the operator panel assembly. See
7
"Operator panel assembly removal" on
page 4-27.
Does this solve the problem?
Replace either of the following:
8
• Scanner to system board flat cable.
• Scanner to system board cable.
Does this solve the problem?

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 customer's permission,
you may need to install a developer (toner) cartridge or photoconductor unit.
Service tip: Before troubleshooting any print quality problems, do the following:
1. Print a menu settings page, and then check the life status of all supplies. Any supplies that are low should
be replaced.
Note: Be sure and keep the original menu page to restore the customer's custom settings if needed.
On the menu page, make sure the following is set to the default level:
2.
Color Correction: Set to Auto.
–
– Print Resolution: Set to 1200 dpi (print quality problems should be checked at different resolution
settings).
Toner Darkness: Set to 4 (default).
–
Color Saver: Set to OFF.
–
– RGB Brightness, RGB Contrast, RGB Saturation: Set to 0.
Color Balance: Touch Reset Defaults to zero out all colors.
–
– Check the paper type, texture and weight settings against what is loaded in the printer.
Once the printer has been restored to its default levels, do the following:
Inspect the transfer module for damage. Replace if damaged.
3.
Inspect the OPCs and toner cartridges for damage. Replace if damaged.
4.
If paper other than 20lb plain letter/A4 paper is being used, load 20lb plain letter/A4 and print the Print
5.
Quality pages to see if the problem remains.
Use Tray 1 to test print quality problems.
6.
Print the Print Quality Pages, and then look for variations in the print from what is expected.
7.
Service Manual
2-154
Problem resolved.
Go to step 6.
Problem resolved.
"Motor driver
4-126.
Problem resolved.
Problem resolved.
Yes
Go to step 5.
Replace either of the
following depending on
what cable has damaged:
• Scanner to system
board flat cable
• Scanner to system
board cable
Go to step 7.
Go to step 8.
Replace the system board.
See
"System board
removal" on page
Previous
No
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Go Back
4-165.