Print Quality-Blurred Or Fuzzy Print; Print Quality-Half-Color Page - Lexmark C540n Service Manual

5025-2xx, 4xx
Step Questions / actions
Remove the developer unit. See
5
unit removal" on page
developer cartridge contacts from the HVPS to
the IU.
Are all the toner cartridge contacts clean on
both the pins and IU?
Are all the spring-loaded pins in the HVPS free
6
to move in and out with an equal amount of
spring force?
Turn the printer off, and remove the rear
7
shield. See
"Top cover assembly removal"
4-13. Check the continuity between
on page
the spring-loaded pins and the JSC1 connector
on the controller board.
Are all conductors continuous?
Replace the printhead. See
8
removal" on page
Did this fix the problem?
Print quality—blurred or fuzzy print
Run the automatic alignment. The TPS sensor may be damaged. To run Reset Color
Cal:
Enter the Diagnostics Menu. (Turn the printer off, press and hold
1.
the printer on, and release the buttons when installed memory and processor
speed displays.
2. Select TPS Setup from Diag Menu, and press Select (
Select Reset Color Cal, and press Select (
3.
Resetting appears. When the reset is complete, the screen is automatically
returned to TPS Setup.
Blurred or fuzzy print is usually caused by a problem in the main drive gear assembly or in the image transfer
unit (ITU). Check the main drive gear assembly and ITU for correct operation.
Blurred print can also be caused by incorrect feeding from one of the input paper sources, media trays, or
duplex paper path.
Check the high-voltage spring contacts to ensure they are not bent, corroded, or damaged. Replace the high-
voltage power supply as necessary. See
page 4-38.
Print quality—half-color page
The imaging unit and developer units may not properly seated. Reseat the imaging unit. If that does not work,
remove the imaging unit and reseat each of the developer units.
Service Manual
2-46
"Developer
4-21. Check the
"Printhead
4-69.
"High-voltage power supply (HVPS) assembly removal" on
Yes
Go to step 6.
Go to step 7.
Go to step 8.
Problem resolved.
and
).
).
No
Clean the developer
cartridge contacts. See
"Developer unit removal"
on page 4-21.
Replace the HVPS. See
"High-voltage power
supply (HVPS) assembly
removal" on page 4-38.
Replace the cable.
Replace the controller
board. See
"Controller
board removal" on
page 4-20.
, turn
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