Brother International HL-2400C Service Manual - Page 293

I-9 Black Line / Blur in the Image Phenomenon Fine black line or blur appears in the printed image as shown in print sample (9) of Fig.82. Main Causes 1) The corona wire of the charger 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 charger unit (corona wire). (See Section 1.2.6 of Chapter VI.) 1-2) Replace the OPC belt cartridge with a new one. (See Section 2.1 of Chapter VI.) 2) Clean the surface of the developer roller. I-10 Vertical Line Phenomenon Vertical line appears in the printed image as shown in print sample (10) of Fig.8-2. 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. Countermeasures 1) Clean the paper discharger unit. (See Section 1.2.5 of Chapter VI.) 2) Clean the charger unit (corona wire) of the OPC belt cartridge. (See Section 1.2.6 of Chapter VI.) 3) Clean the rear face of the waste toner feeder. 4) Replace the OPC belt cartridge with a new one. VIII-48