Epson EPL-N4000 Service Manual page 145

EPSON EPL-N4000/EPL-N4000+
Table 3-60. Electrical Noise Troubleshooting
Step Actions and Questions
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?
3 AC GROUND
Check the AC wall outlet.
Is the AC wall outlet correctly wired
and grounded?
Steps 4 through 11 attempt to find a
faulty printer component 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.
EP CARTRIDGE REPLACEMENT
4
Replace the EP Cartridge
Is the Electrical Noise problem still
present?
5 MAIN SWITCH REPLACEMENT
Replace the Main Power Switch.
Is the Electrical Noise problem still
present?
Rev.B
Yes No
Go to step 3 Go the
Technical
Manual for the
problem
option and
troubleshoot
for arcing
solenoids,
motor, or
faulty PWBs
or wiring.
Go to step 4 Repair the AC
wall outlet
Go to step 5 Problem
solved
Go to step 6 Problem
solved
Table 3-61. Electrical Noise Troubleshooting
Step Actions and Questions
6 HVPS REPLACEMENT
Replace the HVPS Assembly.
Is the Electrical Noise problem still
present?
AC DRIVER REPLACEMENT
7
Replace the AC Driver PWB.
Is the Electrical Noise problem still
present?
8 LVPS ASSEMBLY REPLACE-
MENT
Replace the LVPS Assembly.
Is the Electrical Noise problem still
present?
FUSER ASSEMBLY REPLACE-
9
MENT
Replace the Fuser Assembly.
Is the Electrical Noise problem still
present?
MCU PWB REPLACEMENT
10
Replace the MCU PWB.
Is the Electrical Noise problem still
present?
11 MAIN DRIVE ASSEMBLY
REPLACEMENT
Replace the Main Drive Assembly.
Is the Electrical Noise problem still
present?
Chapter 3 Troubleshooting
Yes No
Go to step 7 Problem
solved
Go to step 8 Problem
solved
Go to step 9 Problem
solved
Go to step Problem
10 solved.
Go to step Problem
11 solved.
Go to Problem
Suspect solved.
Component
s
131