Lexmark CS748de, Service Manual

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Service Manual
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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 module.
Print quality—residual image
Service tip: Install a new print cartridge if available before doing this service check. Residual image can be
caused by the photoconductor, cleaning blade, and other parts inside the print cartridge.
Print quality—solid color page
Service tip: A solid color page is generally caused by a problem in the high voltage system or an incorrect high
voltage in the printing process resulting in toner development on the entire photoconductor drum.
Step Questions / actions Yes No
1
Is there any loose or foreign material on the
photoconductor unit?
Replace the
photoconductor unit. See
“Photoconductor unit
removal” on page 4-150
.
Go to step 2.
2
Is there any loose or foreign material on the
cartridge roll?
Replace the print cartridge. Go to step 3.
3
Is there any loose or foreign material on the
transfer module?
Replace the transfer
module. See
“Transfer
module removal” on
page 4-179
.
Contact your next level of
support.
Step Questions / actions Yes No
1
Is there any toner contamination on the fuser
assembly?
Replace the fuser. See
“Fuser removal” on
page 4-118
.
Contact your next level of
support.
Step Questions / actions Yes No
1
Replace the photoconductor unit for the color
in question.
Does this fix the problem?
Problem resolved. Go to step 2.