Lexmark W820 Service Manual page 156

Light (Undertoned) Prints
The overall image density is too light. The image may also be unfused due to insufficient
image density.
THE PRINTER DISPLAYS NO ERROR CODE.
Step Actions and Questions
1 PAPER INSPECTION
Inspect the paper loaded in the paper trays.
Is the paper wrinkled, dimpled, or show any sign of having
a high moisture content?
2 EP CARTRIDGE REPLACEMENT
Install a new EP Cartridge.
Is the image density normal?
3 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 developed; with
sharp, black, easily read areas?
4 IMAGE TRANSFER INSPECTION
Carefully remove the Test Print generated in step 3.
Inspect the print.
Was the toner image on the drum transferred completely
to the paper?
5 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 normal before it enters the Fuser, but light
when it exits the Fuser?
2-60
Service Manual
4025-XXX
Yes No
Replace with Go to step 2
dry, newly
opened paper
Problem Go to step 3
solved
Go to step 4 Replace the
"High
Voltage
Power
Supply
(HVPS)
Assembly"
on page 4-88
Go to step 5 Replace the
"BTR
Assembly"
on page
If the problem
persists,
replace the
"High
Voltage
Power
Supply
(HVPS)
Assembly"
on page
Replace the Go to step 6
"Fuser
Assembly"
on page 4-65
4-61.
4-88.