Epson EPL-N4000, Service Manual

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EPSON EPL-N4000/EPL-N4000+ Chapter 3 Troubleshooting
Rev.B 119
3.4.7 Horizontal Streaks
Problem
There are black lines running
horizontally across the page.
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 3-41. Horizontal Streaks
Table 3-42. Horizontal Streaks
Step Actions and Questions Yes No
1 EP CARTRIDGE REPLACEMENT
Install a new EP Cartridge.
Are the horizontal streaks gone?
Problem
solved Go to step 2
Step Actions and Questions Yes No
2 IMAGE DEVELOPMENT INSPEC-
TION
1. Remove the Rear Cover.
2. Generate a Blank 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
white; without any horizontal streaks
visible?
Go to step 3 Replace the
ROS
Assembly.
3
IMAGE TRANSFER INSPECTION
Inspect the Blank Test Print you
generated in step 2.
Are horizontal streaks visible on the
paper after Transfer?
Replace the
BTR
Assembly. Go to step 4
4
FUSER INSPECTION
1. Generate another Blank Test Print and
switch OFF printer power when the
print is halfway through the Fuser.
2. Open the Left Upper Cover.
3. Examine the paper areas before the
image enters the Fuser and after the
image exits the Fuser.
Is the image on the paper normal
before it enters the Fuser, but there
are horizontal streaks visible when it
exits the Fuser?
Replace the
Fuser
Assembly. Go to step 5