Lexmark W820 Service Manual page 166

Step Actions and Questions
4 FUSER INSPECTION
Generate another Black 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 spot deletions visible when it exits the
Fuser?
Background
There is a light gray dusting of toner on all or most of the printed page.
THE PRINTER DISPLAYS NO ERROR CODE.
Step Actions and Questions
1 EP CARTRIDGE REPLACEMENT
Install a new EP Cartridge.
Is the background 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 completely clean and without
any noticeable background toner?
3 IMAGE TRANSFER 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.
Before Transfer was the drum clean and without
noticeable background toner, but there was background
visible on the paper after Transfer?
2-70
Service Manual
4025-XXX
Yes No
Replace the Replace the
"Fuser paper with
Assembly" fresh, dry
on page 4-65 paper and
thoroughly
clean the
inside of the
printer.
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