Service manual

QMS 3260/4032 Laser Printer - Base Engine Technical Manual 5-5
Release Version 11-97
Primary Fault Isolation Procedures
5.1 Light (Undertoned) Prints
PROBLEM
The overall image density is too light. The image may also be unfused due to
insufficient image density.
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.
• ROS Assembly (RRP 5.1)
• MCU PWB (RRP 9.7)
Step Actions and Questions Yes No
1
PAPER INSPECTION
Is the paper wrinkled or dimpled?
Load fresh,
dry paper.
Go to step 2
2
EP CARTRIDGE REPLACEMENT
Install a new EP Cartridge (CRU).
Is the image density normal?
Problem
solved
Go to step 3
3
IMAGE DEVELOPMENT INSPECTION
1. Remove the Rear Cover (RRP 1.3).
2. Generate a Grid 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 developed; with
sharp, black, easily read areas?
Go to step 4 Replace the
HVPS Assem-
bly (RRP 9.4)
4
IMAGE TRANSFER INSPECTION
1. Carefully remove the Test Print generated in step 3.
2. Inspect the print.
Was the toner image on the drum transferred completely
to the paper. And are the grid lines black and unbroken?
Go to step 5 Replace the
BTR Assem-
bly (RRP 5.3).
If the problem
persists,
replace the
HVPS Assem-
bly (RRP 9.4)
SER576X