Epson EPL-N4000, Service Manual

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EPSON EPL-N4000/EPL-N4000+ Chapter 3 Troubleshooting
Rev.B 113
3.4.2 Blank White
Problem
The entire print is blank.
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.
•MCU PWB
•CRU Connector and Contact Springs
Table 3-30. Blank White
Table 3-31. Blank White
Step Actions and Questions Yes No
1
CONTROLLER OR HOST SOFT-
WARE ISOLATION
Generate a Grid Test Print.
Is the test print image normal?
Troublesho
ot or
replace the
ESS PWB
or reload
the Host
Driver
Software Go to step 2
2
EP CARTRIDGE REPLACEMENT
Install a new EP Cartridge.
Is there a normal image on the
paper?
Problem
solved Go to step 3
Step Actions and Questions Yes No
3 IMAGE DEVELOPMENT INSPEC-
TION
1. Remove the Rear Cover.
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
developed 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
Assembly.
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?
Suspect an
intermittent
problem.
Replace the
MCU PWB
and/or refer
to the wiring
diagrams
Section 14
and check for
a broken wire
or loose
connection
between
components
in the
Xerographic
sections of
the printer.
Replace the
BTR
Assembly. If
the problem
persists,
replace the
HVPS
Assembly