Brother International HL-3400CN Service Manual - Page 313
Toner spot
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HL-3400CN SERVICE MANUAL 1-14 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 Page 8-45. 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. Drum Cleaner Cleaning brush Toner drop 0 0 Mylar Waste toner feeder Transfer Drum Fig. 8-8 (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.