Lexmark W820 Service Manual page 168

Step Actions and Questions
3 PAPER PATH INSPECTION
Remove the paper trays.
Remove the EP Cartridge.
Use a flashlight to inspect the entire paper path, from Feeder
to Output Tray, for any loose toner.
Is the paper path free of loose toner?
4 BTR INSPECTION
Rotate and inspect the BTR.
Is the BTR clean and free of toner?
5 FUSER INSPECTION
Generate a Test Print and switch OFF printer power when the
print is halfway through the Fuser.
Open the Left Upper Cover.
Examine the paper before it enters the Fuser and after it exits
the Fuser.
Is paper clean before it enters the Fuser, but there is
background on the paper when it exits the Fuser?
6 Thoroughly clean the interior of the printer.
Replace the EP Cartridge.
Generate 20 Test Prints.
Does the toner still appear on the back of paper?
7 The following printer FRUs and areas are associated with this
specific problem. One or more of these FRUs or areas may
have failed partially or completely. If you cannot isolate this
problem using the steps in this Service Check, replace each
FRU or troubleshoot each area listed below, one at a time, until
you isolate and solve the problem.
• HVPS - Go to
Assembly" on page
• MCU PWB - Go to
page 4-92.
• I/O PWB - Go to
2-72
Service Manual
"High Voltage Power Supply (HVPS)
4-88.
"Engine Board (MCU PWB)" on
"I/O PWB" on page
4025-XXX
4-89.
Yes No
Go to step 4 Thoroughly
clean the
paper path,
from Feeders
to the Output
Tray, including
all rubber feed
rolls
Go to step 5 Clean or
replace the
"BTR
Assembly"
on page 4-61
Go to step 6 Clean or
replace the
"Fuser
Assembly"
on page 4-65
Go to step 7 Problem
solved