Epson EPL-N4000, Service Manual

Page: 139 / 306

EPSON EPL-N4000/EPL-N4000+ Chapter 3 Troubleshooting
Rev.B 125
3.4.11 Background
Problem
There is toner contamination on all or
part of the page. The contamination
appears as a very light gray dusting.
SUSPECT COMPONENTS
The following components are
associated with this specific problem.
One or more of these components
may have failed partially or
completely. If you cannot isolate the
problem using this FIP, replace each
component listed below, one at a
time, until the problem disappears.
• HVPS Assembly
• MCU PWB
• C262 Main Controller Board
Table 3-51. Background
Table 3-52. Background
Step Actions and Questions Yes No
1
EP CARTRIDGE REPLACEMENT
Install a new EP Cartridge.
Is the background gone?
Problem
solved Go to step 2
Step Actions and Questions Yes No
2 IMAGE DEVELOPMENT INSPEC-
TION
1. Remove the Rear Cover.
2. Generate a Blank Test Print and
switch OFF printer power halfway
through the print cycle.
3. Open the Left Upper Cover.
4. Open the Drum Shutter.
5. Hand rotate (counter clockwise) 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 com-
pletely clean; without any notice-
able background toner?
Go to step 3 Replace the
ROS
Assembly
3
IMAGE TRANSFER INSPECTION
1. Remove the Rear Cover.
2. Generate a Blank Test Print and
switch OFF printer power halfway
through the print cycle.
3. Open the Left Upper Cover.
4. Open the Drum Shutter.
5. Hand rotate (counter clockwise) 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?
Replace the
BTR
Assembly. Go to step 4