Uneven Density - Samsung ML-3561N Service Manual

Troubleshooting

7.1.7 Uneven Density

• Description Print density is uneven between left and right.
7.1.8 Background
• Description Light dark background appears in whole area of the printing.
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Service Manual
7-4
Check and Cause
1. The pressure force on the left and right
springs of the transfer roller is not even,
the springs are damaged, the transfer
roller is improperly installed, or the trans-
fer roller bushing or holder is damaged.
2. The life of the print cartridge has expired.
3. The toner level is not even on the print
cartridge roller due to the bad blade.
Check and Cause
1. Does character exist less than 2%
coverage per a page, and hasn't it
been used long time?
(see the configuration sheet)
2. Is a recycled print cartridge be used?
3. Has the life span of the print
cartridge ended?
4. Is the movement(Up and Down) of
the transfer roller smooth?
5. Is the HVPS normal?
Solution
1. Replace both the left and right Spring
Holder.
2. Occur in the print cartridge gently shake
the print cartridge.
3.Replace the print cartridge and try to print
out.
Solution
1. The print cartridge is basically
designed to print 12,000 pages with
5% coverage. If it prints more than
15,000 pages with 2% coverage, a
background can occur.
2. The A/S is not guaranteed if using a
recyled the print cartridger.
3. Replace the print cartridge when the
life span of it has been ended.
4. Clean the bushing part of the transfer
roller.
5. If the problem is still not solved,
replace the print cartridge.
Samsung Electronics