MINOLTA-QMS magicolor 6100 Series Service Manual page 400

8.5.15 White Spot / Black Spot
Page 8-86
8.5.15.1 Phenomenon
A white or black spot appears on the image as shown in the print sample
at the upper-right corner.
8.5.15.2 Main Causes
1. Foreign particles adhering to the OPC belt or transfer drum.
2. The OPC belt or transfer drum is damaged.
3. Foreign particles mixed into the toner.
4. Foreign particles adhering to the transfer roller, or deformation of
transfer roller.
8.5.15.3 Countermeasures
1. Remove the belt cartridge and lightly wipe off any foreign particles
adhering to OPC belt, using lint free cloth.
2. Replace the damaged belt cartridge with a new cartridge.
3. Open the transfer unit, and check the transfer drum.
4. Lightly wipe off the foreign particles adhering to transfer drum, using
a lint free cloth.
5. Replace the damaged transfer drum with a new drum (see section
7.6.3).
6. Replace the toner cartridge with a new cartridge (see section 3.3.3).
7. Replace the transfer unit with a new unit (see section 7.6.1).
Transfer Drum
Belt
Cartridge
Fig. 8-90
Fig. 8-89
magicolor 6100 Series Service Manual