Service manual

QMS 3260/4032 Laser Printer - Base Engine Technical Manual 6-5
Release Version 11-97
Secondary Fault Isolation Procedures
6.1 Electrical Noise
Step Actions and Questions Yes No
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.
Lift Up Motors
Feed Clutches
ROS Assembly (RRP 5.1)
Offset Unit (RRP 7.1)
QMS Video Controller (RRP 9.8)
1
EXTERNAL NOISE
1. Check if there is other electrical equipment, such as elec-
trical generators, radio transmitters, or devices using elec-
trical motors, within ten feet of the printer.
2. Shut off the other electrical equipment or relocate the
printer at least twenty feet away from the other devices.
Is the Electrical Noise problem still present?
Go to step 2 Permanentl
y
relocate either
the printer or
the problem
device.
2
OPTION ISOLATION
If the printer has options installed, such as Duplex Unit or the
High Capacity Feeder, remove each option one at a time, and
see how the printer operations without that option installed.
Does the Electrical Noise problem go away when you
remove a specific option?
Go to step 3 Go the Tech-
nical Manual
for the prob-
lem option
and trouble-
shoot for arc-
in
g
solenoids,
motor, or
fault
y
PWBs
or wirin
g
.
3
AC GROUND
Check the AC wall outlet.
Is the AC wall outlet correctly wired and grounded?
Go to step 4 Repair the AC
wall outlet
Steps 4 through 11 attempt to find a faulty printer compo-
nent that may be generating electrical noise. If replacing a
component does not solve the problem, reinstall the old
component before moving on to the next step.
4
EP CARTRIDGE REPLACEMENT
Replace the EP Cartridge
Is the Electrical Noise problem still present?
Go to step 5 Problem
solved
5
MAIN SWITCH REPLACEMENT
Replace the Main Power Switch (RRP 9.1)
Is the Electrical Noise problem still present?
Go to step 6 Problem
solved