Lexmark W820 Service Manual page 172

Repetitive Marks on Each Page
Identical image defects appears on each or on every other printed sheet.
THE PRINTER DISPLAYS NO ERROR CODE.
Step Actions and Questions
1 DRUM IMAGE INSPECTION
Generate a single Test Print.
Open the Upper Left Cover when the sheet of paper is
approximately half-way through the transfer process.
Carefully remove the EP Cartridge from the printer.
Inspect the surface of the Drum.
Does the mark appear on the Drum before image transfer?
2 TRANSFER IMAGE INSPECTION
Inspect the Test Print generated in step 1.
Does the mark appear on the paper after image transfer?
3 FUSED IMAGE INSPECTION
Generate a single Test Print.
Open the Upper Left Cover when the sheet of paper is
approximately half-way through the Fuser.
Inspect the Test Print.
Does the mark appear on the paper after Fusing?
Lead Edge Registration is Not Correct
The printed image is not centered on the page. The lead edge margin of the printed
image is either too narrow or too wide, and either cuts off the lead edge of the printed
image or starts the lead edge of the printed image too far into the page.
THE PRINTER DISPLAYS NO ERROR CODE.
Step Actions and Questions
1 PAPER TRAY INSPECTION
Inspect the paper loaded in the paper tray.
Is the paper loaded correctly and are the paper guides
adjusted correctly?
2 LEAD EDGE REGISTRATION
Go to "Setting Printer Registration" on page 3-32
NVRAM to adjust Lead Edge Registration.
Can you adjust lead edge registration using NVRAM?
3 Reload print driver software.
Generate 5 Test Prints.
Is the lead edge registration correct?
2-76
Service Manual
4025-XXX
and use
Yes No
Replace the Go to step 2
EP Cartridge
Replace the Go to step 3
"BTR
Assembly"
on page 4-61
Replace the
"Fuser
Assembly"
on page 4-65
Yes No
Go to step 2 Reload the
paper and
adjust the
paper guides
Problem Go to step 3
solved
Problem Go to step 4
solved