Brother International HL-2600CN Service Manual - Page 331

I-1 Background Phenomenon Background is smeared due to toner spread as shown in print sample (1) of Fig.8-2. Main Causes 1) Too small toner mass and charging level in the developing process. 2) Poor contact of the developer roller's bias pole. 3) Life expired or failure of the OPC belt cartridge. 4) Failure of the high voltage power supply unit (HVU). Countermeasures 1) Replace the toner cartridge. (See Section 3.3 of Chapter III.) 2) Confirm if the developer bias pole is deformed or not. 3) Replace the OPC belt cartridge. (See Section 2.1 of Chapter VI.) 4) Replace the high voltage unit (HVU). I-2 Missing Image at Edge Phenomenon There is missing or peeling toner found in the image at the edge as shown in the print sample (2) of Fig.8-2. Main Causes 1) Too small toner mass and charging level in the developing process. 2) The OPC belt is deformed (waving). Countermeasures 1) Replace the toner cartridge with a new one. 2) Replace the OPC belt cartridge with a new one.