Service manual

5-14 QMS 3260/4032 Laser Printer - Base Engine Technical Manual
Release Version 11-97
Primary Fault Isolation Procedures
5.5 Horizontal Band Deletions
PROBLEM
There are areas of the image that are extremely light or missing entirely.
These missing areas form wide bands that run horizontally across the page,
parallel with the direction of paper travel.
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 can-
not isolate the problem usin
g
this FIP, replace each component listed below,
one at a time, until the problem disappears.
• CRU Connector and Contact Springs (PL7.2)
• MCU PWB (RRP 9.7)
• Fuser Assembly (RRP 6.1)
Step Actions and Questions Yes No
1
PAPER INSPECTION
Is the paper wrinkled or dimpled?
Replace with
fresh, dry
paper
Go to step 2
2
EP CARTRIDGE REPLACEMENT
Install a new EP Cartridge (RRP 5.2).
Are the horizontal band deletions gone?
Problem
solved
Go to step 3
3
IMAGE TRANSFER INSPECTION
1. Remove the Rear Cover (RRP 1.3).
2. Generate a Solid Black 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.
Before Transfer was the toner image on the drum normal
and without horizontal band deletions, but there are dele-
tions on the paper after Transfer?
Go to step 4 Replace the
BTR Assem-
bly (RRP 5.3),
then go to
step 4
4
HVPS CHECK
Generate a Solid Black Test Print.
Is the Test Print normal, with no horizontal band dele-
tions?
Problem
solved
Replace the
HVPS Assem-
bly (RRP 9.4)
SER578X