Horizontal Black Streaks - Epson EPL-N2050 Service Manual

EPSON EPL-N2050

3.4.8 Horizontal Black Streaks

Problem
There are black lines running
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
• Harness Assy Conn (J23-J231)
• PWBA HKB MCU
• Spring Clip
• BTR Chute Assy
• Pressure Roll Assy
• ROS Assy
• PWBA LVPS
2. Inspect the printer papre path. Is it clear of
foreign matter such as stapled, paper clips,
and paper scrap?
Troubleshooting by Print Image Quality
Table 3-17. Horizontal Black Streaks
Step Action and Question
DRUM GROUND
Check the Drum Ground Path:
1 Drum>Drum Shaft Pin>Spring
Clip>Frame
Is the Drum Ground Path complete?
ROS ASSY
Use a sheet of paer to cover the laser
beam window.
2
Generate a test print.
Is the problem still present?
BTR ASSY
Inspect the BTR Assy for
3
contamination.
Is the BTR free of contamination?
CRU FAILURE
4 Replace the CRU with a new one.
Is the problem solved?
HEAT ROLL ASSY
Inspect the Heat Roll for scratches,
5 objects, or contamination.
Is the Heat Roll free of scratches and
contamination?
NOISE
Go to Table 3-45, "Electrical Noise,"
6
on page 101 for possible noise
problem.
Revision B
Yes No
Re-establish
Go to Step 2. the Drum
Ground Path
Go to
Table 3-28,
Go to Step 3. "ROS Assy
Failure," on
page 90.
Replace the
Go to Step 4.
BTR Assy.
Problem
Go to Step 5.
solved.
Replace the
Go to Step 6.
Heat Roll.
80