Lexmark X734de Service Manual page 193

Print quality—horizontal line
The photoconductor unit is defective. Replace the photoconductor unit.
Print quality—insufficient fusing
Step Questions / actions
Is the fuser properly installed?
1
Replace the fuser. See
2
removal" on page
Does this fix the problem?
Print quality—missing image at edge
Reseat the developer cartridge.
Print quality—mottle (2–5mm speckles)
Keep running prints through, and the problem normally clears up. If the problem persists, replace the developer
cartridge.
Print quality—narrow vertical line
Step Questions / actions
Replace the photoconductor unit. See
1
"Photoconductor unit removal" on
page 4-144.
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 belt.
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 belt?
"Fuser assembly
4-114.
Yes
Go to step 2.
Problem resolved.
Yes
Problem resolved.
Yes
Replace the
photoconductor unit. See
"Photoconductor unit
removal" on page 4-144.
Replace the print cartridge.
Replace the transfer
module. See
"Transfer
module removal" on
page 4-191.
7526
No
Install the fuser properly.
Replace the LVPS. see
"Low-voltage power
supply (LVPS) removal"
on page 4-124.
No
Replace the print cartridge.
No
Go to step 2.
Go to step 3.
Contact your next level of
support.
Diagnostic information
2-155
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