Uneven Density - Xerox Phaser 3450 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 Toner cartridge has
expired.
3. The toner level is not even on the toner
cartridge roller due to the bad blade.
Check and Cause
1. Does character exist less than 2%
per a page, and hasn't it been used
long time?
2. Is a recycled toner cartridge be
used?
3. Has the life span of the toner car-
tridge 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 toner cartridge, replace the
toner cartridge and try to print out.
Solution
1. The toner cartridge is basically
designed to print 8,000 sheets with
5% image. If it prints more than
12,000 sheets with 2% coverage, a
background can occur.
2. The B/S is not guaranteed if using a
recycled the toner cartridge.
3. Replace the toner 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 toner cartridge.