Service manual

5-24 QMS 3260/4032 Laser Printer - Base Engine Technical Manual
Release Version 11-97
Primary Fault Isolation Procedures
5.11 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 followin
g
components are associated with this specific problem. One
or more of these components ma
y
have failed partiall
y
or completel
y
. If
y
ou cannot isolate the problem usin
g
this FIP, replace each component
listed below, one at a time, until the problem disappears.
• HVPS Assembly (RRP 9.4)
• MCU PWB (RRP 9.7)
• ESS Mother PWB (RRP 9.10)
Step Actions and Questions Yes No
1
EP CARTRIDGE REPLACEMENT
Install a new EP Cartridge (RRP 5.2).
Is the background gone?
Problem
solved
Go to step 2
2
IMAGE DEVELOPMENT INSPECTION
1. Remove the Rear Cover (RRP 1.3).
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 devel-
oped image area on the Drum before
it reached Transfer.
Is the image on the drum completely clean; without any
noticeable background toner?
Go to step 3 Replace the
ROS Assem-
bly (RRP 5.1)
SER584X