Horizontal Streaks - Lexmark W820 Service Manual

Horizontal Streaks

There are black lines running horizontally across the paper.
THE PRINTER DISPLAYS NO ERROR CODE.
Step Actions and Questions
1 EP CARTRIDGE REPLACEMENT
Install a new EP Cartridge.
Are the horizontal streaks gone?
2 IMAGE DEVELOPMENT INSPECTION
Remove the Rear Cover.
Generate a Test Print and switch OFF printer power halfway
through the print cycle.
Open the Left Upper Cover.
Open the Drum Shutter.
Hand rotate (counterclockwise) the Main Drive Motor to
advance the Drum far enough so you can see the developed
image area on the Drum before it reached Transfer.
Is the image on the drum complete without any visible
problems?
3 IMAGE TRANSFER INSPECTION
Inspect the Test Print you generated in step 2.
Are horizontal streaks visible on the paper after Transfer?
4 FUSER INSPECTION
Generate another Test Print and switch OFF printer power
when the print is halfway through the Fuser.
Open the Left Upper Cover.
Examine the paper areas before the image enters the Fuser
and after the image exits the Fuser.
Is the image on the paper normal before it enters the
Fuser, but there are horizontal streaks visible when it exits
the Fuser?
5 ESS PWB REPLACEMENT
Replace the
Are the horizontal streaks gone?
6 HVPS REPLACEMENT
Replace the
Assembly" on page
Are the horizontal streaks gone?
2-68
Service Manual
"Controller Board (ESS PWB)" on page
"High Voltage Power Supply (HVPS)
4-88.
4025-XXX
4-94.
Yes No
Problem Go to step 2
solved
Go to step 3 Replace the
"Printhead
Assembly"
on page 4-57
Replace the Go to step 4
"BTR
Assembly"
on page 4-61
Replace the Go to step 5
"Fuser
Assembly"
on page 4-65
Problem Go to step 6
solved
Problem Go to step 7
solved