2-78 Service Manual
4025-XXX
Electrical Interference
Something is generating electrical noise that may be interfering with the normal operation
of the printer. The interference generator may be either external or internal to the printer.
If you are using a parallel connection, make sure it is fully shielded and grounded at both
ends.
5 Replace the “Printhead Assembly” on page 4-57.
Generate 5 Test Prints.
Is the side-to-side registration correct?
Problem
solved
Go to step 6
6 The following printer FRUs and areas are associated with this
specific problem. One or more of these FRUs or areas may
have failed partially or completely. If you cannot isolate this
problem using the steps in this Service Check, replace each
FRU or troubleshoot each area listed below, one at a time, until
you isolate and solve the problem.
• Registration Chute - Go to “Registration Chute” on
page 4-54.
• EP Cartridge
• ESS PWB - Go to “Controller Board (ESS PWB)” on
page 4-94.
• I/O PWB - Go to “I/O PWB” on page 4-89.
Step Actions and Questions Yes No
1 EXTERNAL NOISE
Check if there is other electrical equipment, such as electrical
generators, radio transmitters, or devices using electrical
motors, within ten feet of the printer.
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 Permanently
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 operates without that option installed.
Does the Electrical Noise problem go away when you
remove a specific option?
Go to step 3 Go to the
Option
Service
Manual and
troubleshoot
for arcing
solenoids and
motors, or
faulty PWBs
or wiring.
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
Step Actions and Questions Yes No
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