Brother HL-2400C Service Manual page 290

I-3 Jitter
Phenomenon
Uneven optical density appears periodically in the horizontal direction on the printed
image as shown in print sample (3) of
Main Causes
Failure of main motor.
1) Irregular rotation of the drive motor.
2) Failure of the gears.
3) Variation of OPC belt running speed due to above reasons.
4) Too much rotational load of the OPC belt.
Countermeasures
1) Replace the main motor with a new one. (See
2) Replace the OPC belt cartridge with a new one. (See
Note:
If the print mode is set to CAPT (Color Advanced Photoscale Technology) in the driver,
this problem might occur. Change the mode setting to normal mode.
I-4 Ribbing
Phenomenon
Light print occurs on the right or left hand side of the image as shown in
of Fig.8-2.
Main Causes
1) Slight tilt on the surface of printer
installation table.
(Tilt should be less than 1 ° .)
2) Toner amount in the toner
cartridge is insufficient.
(The amount in a full cartridge
should be 175g for Y, M, & C and
275g for K.)
Countermeasures
1) Confirm that the printer installation table is flat and level.
2) Replace the toner cartridge with a new one.
Fig.8-2.
Section 4.1.8 of Chapter
Section 2.1 of Chapter
VIII-44
VII.)
VI.)
print sample (4)
Fig.8-3
1