Brother HL-3450CN Service Manual page 317

CHAPTER 8 TROUBLESHOOTING
I-9
Phenomenon
Fine black line or blur appears in the printed image as shown in
45.
Main Causes
(1) The corona wire of the paper discharger unit is dirty.
(2) OPC belt surface is damaged.
(3) Foreign particles (paper dust, etc.) are stuck between the cleaning blade and OPC belt.
(4) Debris adhering to the base of the toner cartridge's developer roller where it contacts with
the OPC belt.
Countermeasures
(1) Remove the OPC belt cartridge.
1-1) Clean the discharger unit (corona wire). (See
1-2) Replace the OPC belt cartridge with a new one. (See
(2) Clean the surface of the developer roller.
I-10
Phenomenon
Vertical line appears in the printed image as shown in
Main Causes
(1) Foreign particles (dust, etc.) adhering to the parts located around the transfer drum, and
consequently in contact with the toner image on the transfer drum.
(2) Damage of the OPC belt due to foreign particles adhering to the blade of the OPC belt
cleaner.
Countermeasures
(1) Clean the paper discharger unit. (See
(2) Clean the charger unit (corona wire) of the OPC belt cartridge. (See
Chapter
(3) Clean the rear face of the waste toner feeder.
(4) Replace the OPC belt cartridge with a new one.
Black Line / Blur in the Image
Vertical Line
6.)
Section 2.6 of Chapter
Section 4.1 of Chapter
print sample (10) of Page
Section 2.5 of Chapter
8-54
print sample (9) of Page 8-
6.)
6.)
8-45.
6.)
Section 2.6 of