Too Light Print (Weak Gradation) - Epson EPL-N3000 Service Manual

EPSON EPL-N3000/AcuLaser M4000N

3.5.2 Too Light Print (Weak Gradation)

Step Action and Question
Paper condition
1. Set new dry recommended paper.
1
2. Execute test printing.
♦
Is image density normal?
Path of laser beam
1. Inspect the path of laser beam from the ROS ASSY
to the Drum.
2
2. Check the window of the ROS ASSY to see if it is
not dirty.
♦
Is the path of the laser beam clean and is the
window of the ROS ASSY free from any obstacle?
Imaging Cartridge
1. Install a new Imaging Cartridge.
3
2. Print the image in question again.
♦
Is image density normal?
Troubleshooting
Description of the problem:
Image density is too light as a whole.
Parts below can be the source of this error:
• Imaging Cartridge
• GUIDE ASSY CRU R
(p.257)
• BTR ASSY
(p.254)
• 150 FEEDER ASSY
(p.211)
• BOARD ASSY., MAIN
(p.299)
• ROS ASSY
(p.239)
• FUSER ASSY
(p.253)
• LVPS
(p.287)
• HVPS/MCU
(p.301)
• 550 FEEDER ASSY
(p.224)
Yes
Problem
Go to Step 2
solved
Remove the
obstacle or
Go to Step 3 clean the
window of the
ROS ASSY.
Problem
Go to Step 4
solved
Picture Image Trouble
Step Action and Question
BTR ASSY
1. Remove the BTR ASSY. (p.254)
4
2. Check the BTR Assy for dirt or wear.
♦
Is the BTR free from dirt and damage and wear?
Grounding of the Drum
1. Remove the GUIDE ASSY CRU R. (p.257)
5
2. Inspect the Plate Earth located behind the GUIDE
ASSY CRU R.
♦
Is the Plate Earth free from dirt and damage and
deformation?
HVPS/MCU
1. Replace the HVPS/MCU. (p.301)
6
2. Execute test printing.
♦
Was the trouble cleared?
Image developing process
1. Execute test printing, and turn off the power to the
No
printer during printing.
2. Remove the Imaging Cartridge carefully, and
7
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?
Image transfer process
1. Inspect the toner image formed on the drum located
8
just after the transfer portion (the BTR).
♦
Is the toner image on the drum completely copied
onto the paper?.
Revision C
Yes No
Replace the
Go to Step 5
BTR ASSY
Repair or
clean the Plate
Earth, or
Go to Step 6
replace the
GUIDE ASSY
CRU R.
Problem
Go to Step 7
solved
Go to 3.4.16
Go to Step 8 HVPS/MCU
(p.126)
See "Parts
Go to 3.4.16
below can be
HVPS/MCU
the source of
(p.126)
this error"
145
Confidential