Horizontal White Banding - Epson EPL-N2050 Service Manual

EPSON EPL-N2050

3.4.6 Horizontal White Banding

Problem
There are areas of the image
that are extrreamly light or
missig entirely. These missing
areas form wide bands that run
horizontally across the page..
Troubleshooting
Initial Analysis
1. Inspect the following components. Are they
compatible with your printer version,
correctly installed, not damaged, deformed,
or contaminated?
• CRU
• PWBA HVPS
• BTR Assy
• Heat Roll
• Fuser Assy
• PWBA HKB MCU
• Spring Clip
• BTR Chute Assy
• Pressure Roll Assy
• ROS Assy
2. Inspect the printer paper path. Is it clear of
foreign matter such as staples, paper clips,
and paper scrap?
Troubleshooting by Print Image Quality
Table 3-15. Horizontal White Banding
Step Action and Question
PAPER CONDITIONS
1 Is there moisture in the paper?
Is the paper wrinkled?
DRIVE COMPONENTS FAILURE
Use MAIN MOTOR TEST to check the
2 Gear Assy Drive.
Are the Drive Assy gears turning the
CRU gear?
BTR ASSY
Inspect the BTR Assy for
3
contamination.
Is the BTR free of contamination?
IMAGE TRANSFER PROCESS
FAILURE
Generate a test print and switch OFF
printer power halfway through the
print cycle.
4
Remove the CRU and inspect the
toner image on the Drum.
Was the image on the Drum
transferred completely to the paper?
CRU FAILURE
5 Replace the CRU with a new one.
Is the problem solved?
HEAT ROLL DAMAGE
6
Do the band deletions occur at
intervals of approximately 62.0 mm?
PRESSURE ROLL DAMAGE
7
Do the band deletions occur at
intervals of approximately 61.0 mm?
Revision B
Yes No
Replace with
new and dry Go to Step 2.
paper.
Go to
Table 3-36,
"Drive
Go to Step 3.
Components
Failure," on
page 95.
Replace the
Go to Step 3.
BTR Assy.
Go to
Table 3-44,
Go to Step 5. "PWBA HVPS
Failure," on
page 100.
Problem
Go to Step 7.
solved.
Clean or replace
Go to Step 8.
the Heat Roll.
Clean or replace Return to
the Pressure Initial
Roll Assy. Analysis.
78