Brother HL-2400C Service Manual page 296

I-13 White Band
Phenomenon
White banding line appears in the horizontal direction, and consequently causes a
missing image as shown in
Main Causes
1) Installation failure of the transfer unit, and deformation of the transfer roller.
2) Contact failure of the transfer roller bias pole.
3) Transfer solenoid failure.
Countermeasures
1) Confirm if the transfer unit is properly locked in position and that both ends of the
transfer unit are held by the hooks.
2) Confirm if the transfer unit is properly installed or not.
3) Replace the transfer solenoid with a new one. (See
4) Replace the transfer unit with a new one. (See
I-14 Toner Drop
Phenomenon
Toner spot stain is caused on the print by toner dropping within the printer engine as
shown in print sample (14) of Fig.8-2.
Main Causes
1) Toner drops onto the transfer drum due to the breakdown of the waste toner feeder.
1-1) Mylar of the waste toner feeder is deformed.
1-2) Waste toner is not properly collected by the waste toner feeder.
Toner drop
2) Toner adhering to the developer roller drops on the OPC belt .
Countermeasures
1) Check the cleaning brush and waste toner feeder.
1-1) Clean the perimeter of the cleaning brush installation location.
1-2) Check if the seal is deformed or damage. If there is any deformation or damage,
replace the waste toner feeder with a new one.
1-3) Check if waste toner is stuck in the printer engine. Remove the waste toner with a
vacuum cleaner designed to manage toner.
2) Remove the toner cartridge.
2-1) Clean the surface of the developer roller.
2-2) Replace the toner cartridge with a new one.
print sample (13) of Fig.8-2.
Drum Cleaner
Cleaning brush
Transfer Drum
Fig.8-9
VIII-50
Section 4.1.14 of Chapter
Section 4.6.1 of Chapter
Mylar
Waste toner feeder
VII.)
VII.)