Brother HL-2400C Service Manual page 297

I-15 White Spot / Black Spot
Phenomenon
White spots and black spots appear on the print as shown in
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 in the toner.
4) Foreign particles adhering to the transfer roller, or local deformation of the transfer
roller.
Countermeasures
1) Remove the OPC belt cartridge.
1-1) Lightly wipe off the foreign particles adhering to the OPC belt using a cotton cloth.
1-2) Replace the damaged OPC belt cartridge with a new one. (See
Chapter VI.)
2) Open the transfer unit, and check the transfer drum.
2-1) Lightly wipe off the foreign particles adhering to the transfer drum using a cotton
cloth.
2-2) Replace the damaged transfer drum with a new one. (See
Chapter VII.)
3) Remove the toner cartridge.
3-1) Clean the surface of the developer roller.
3-2) Replace the toner cartridge with a new one.
4) Replace the transfer unit with a new one. (See Section
I-16 Mixed Color Image
Phenomenon
Mixed color image appears in the print as shown in
Main Causes
1) Failure of toner cartridge: Blade pressure of the developer roller is incorrect or the
blade is deformed.
2) Restitution error of toner cartridge.
Countermeasures
1) Confirm the toner cartridge can be inserted smoothly.
2) Replace the toner cartridge with a new one.
3) Reconfirm that the front cover unit is locked.
4.6.1 of Chapter
print sample (16) of
VIII-51
print sample (15) of Fig.8-2.
Section 2.1 of
Section 4.2.11 of
VII.)
Fig.8-2.