Lexmark C734dn Service Manual page 173

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.
Step Questions / actions
Is there any loose or foreign material on the
1
photoconductor unit?
Is there any loose or foreign material on the
2
cartridge roll?
Is there any loose or foreign material on the
3
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.
Step Questions / actions
Is there any toner contamination on the fuser
1
assembly?
Yes
Replace the
photoconductor unit. See
"Photoconductor unit
removal" on page 4-132.
Replace the print cartridge.
Replace the transfer
module. See
"Transfer
module removal" on
page 4-168.
Yes
Replace the fuser. See
"Fuser removal" on
page 4-104.
5026
No
Go to step 2.
Go to step 3.
Contact your next level of
support.
No
Contact your next level of
support.
Diagnostic information
2-137
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