Print Quality Service Checks - Lexmark C750 Service Manual

5060-00x
Step Actions and questions
6 Voltage check—output expander system board—
Reinstall the output expander option and check the
voltages at J1A and J1B on the connector.
Are the voltages correct?
Remove paper - Output Bin x displays, POST is incomplete, unable to clear the
message.
Step Actions and questions
1 Output sensor flag check—check the flag for correct
operation, binds, broken parts, or interference from the
sensor cable.
Is there a problem with the sensor flag?
2 Output bin sensor—run the sensor test to check the
output bin sensor for correct operation.
Does the sensor operate correctly?

Print quality service checks

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 an ITM, fuser assembly, second transfer roll, or print cartridge.
Check the following before proceeding with any of the print quality service checks.
•
Use Tray 1 (internal tray) to test the print quality of the base printer.
•
Be sure the fuser assembly is installed correctly.
•
Be sure the ITU assembly is installed correctly.
•
Be sure the Second Transfer Roll is installed correctly.
•
Check the media in Tray 1 to make sure it meets paper specifications.
•
Run a copy of the CE Test page, this sets all the printer defaults to the correct settings to check for print
quality.
•
If a specific color has a print quality problem, first try a new cartridge to help isolate the problem.
An incorrect printer driver for the installed software, can cause print quality problems. Incorrect characters could
print and the copy may not fit the page correctly.
Note: Some 201 Paper Jam errors can be caused by a faulty print cartridge.
2-136
Service Manual
Yes No
Replace the Output Replace the Output
Expander option Expander option
system board mechanical linkage
assembly
Yes No
Replace the flag or Go to step 2
repair as
necessary
Call your next level Replace the sensor
support assembly. If this
does not fix the
problem replace
the engine board.
See
board removal"
on page
"Engine
4-29.