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4-9
TROUBLESHOOTING
Service Manual
4.2.7 Uneven Density
• Description Print density is uneven between left and right.
Check and Cause Solution
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 toner level is not even on the devel-
oper roller due to the bad blade.
1. Replace both the left and right Spring
Holder.
2. Occur in the developer cartridge, replace
the developer and try to print out.
4.2.8 Background
• Description Light dark background appears in whole area of the printing.
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Check and Cause Solution
1.
Does character exist less than 2%
per a page, and hasn’t it been used
long time?
2.
Does recycle paper be used?
3.
Has the life span of the developer
ended?
4.
Is the movement(Up and Down) of
the transfer roller smooth?
5. Is the HVPS normal?
1.
The toner cartridge is basically
designed to print 3,000 sheets with
5% image. If it prints more than
3,000 sheets (around 5,000 sheets)
with 2% image, a background can be
occurred.
2.
The B/S is not guaranteed if using
recycle paper.
3.
Replace the developer 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 developer.