User`s guide

Improving Print Quality
5-31
Troubleshooting Chapter 5
Image is too
dark
The brightness setting
on the host computer
is not set properly.
Adjust the brightness set-
ting on the host computer to
the desired level.
The toner cartridge
may be defective.
Change the cartridges and/
or the transfer belt unit.
• See Toner Cartridge
+p. 4-1
• See Drum Cartridge
+p. 4-11
• See Image Transfer Belt
Unit +p. 4-31
The drum cartridge
may be defective.
The image transfer
belt unit may be
defective.
The image transfer
roller unit requires
replacement.
Change the image transfer
roller unit. +p. 4-23
The toner
smudges
The toner cartridge
may be defective.
Change the cartridges and/
or the transfer belt unit.
• See Toner Cartridge
+p. 4-1
• See Drum Cartridge
+p. 4-11
• See Image Transfer Belt
Unit. +p. 4-31
The drum cartridge
may be defective.
The image transfer
belt unit may be
defective.
The image transfer
roller unit requires
replacement.
Change the image transfer
roller unit. +p. 4-23
The oiling roller
requires replacement.
Change the oiling roller.
+p. 4-19
Symptom Cause Action