Epson AcuLaser M4000N, Service Manual

Page: 153 / 477

EPSON EPL-N3000/AcuLaser M4000N Revision C
Troubleshooting Picture Image Trouble 153
Confidential
3.5.9 Image Partial Missing (White Spots)
†
Description of the problem:
In the image, there is extremely light areas or
areas where image is completely missing.
These areas are found scattering in a narrow
part on the paper.
†
Parts below can be the source of this error:
• Imaging Cartridge
• HVPS/MCU
(p.301)
• BTR ASSY
(p.254)
• 150 FEEDER ASSY
(p.211)
• BOARD ASSY., MAIN
(p.299)
• 550 FEEDER ASSY
(p.224)
Step Action and Question Yes No
1
Paper condition
1. Set new dry recommended paper.
2. Print the image in question again.
♦
Does the problem still occur?
Go to Step 2
Problem
solved
2
Imaging Cartridge
1. Install a new Imaging Cartridge.
2. Print the image in question again.
♦
Does the problem still occur?
Go to Step 3
Problem
solved
3
Image developing process
1. Execute test printing, and turn off the power to the
printer during printing.
2. Remove the Imaging Cartridge carefully, and
inspect the toner image formed on the drum located
just before the transfer portion (BTR).
♦
Is the image on the drum such that it has been
completely formed, the region is clear and black,
and can be easily read?
Go to Step 4
Go to 3.4.16
HVPS/MCU
(p.126)
4
Image transfer process
1. Inspect the toner image formed on the drum located
just after the transfer portion (the BTR).
♦
Is the toner image on the drum completely copied
onto the paper?.
Go to Step 5
Replace the
BTR ASSY
5
Heat Roll and Pressure Roll
1. Remove the FUSER ASSY. (p.253)
WARNING!: Wait until the Fuser cools, and
then start work.
2. Turn the Gear HR by hand, and inspect the Heat
Roll and the Pressure Roll.
♦
Are the Heat Roll and the Pressure Roll free from
scratches, dirt and damage?
See “Parts
below can be
the source of
this error”
Replace the
FUSER ASSY
Step Action and Question Yes No