Brother International HL-2400C Service Manual - Page 292

I-7 White Line (2) Phenomenon Vertical white line appears from the leading edge to the trailing edge of the printed image as shown in print sample (7) of Fig.8-2. Main Causes The dustproof glass of the scanner unit is smeared with toner or foreign particles. Countermeasures Clean the dustproof glass. 1) Remove the OPC belt cartridge and toner cartridges. (See Section 2.1 of Chapter VI.) 2) Remove the dustproof glass from the scanner unit. 3) Clean the dustproof glass. (See Section 1.2.8 of Chapter VI.) I-8 Vertical White Band Phenomenon White band appears in the vertical direction of printed image as shown in print sample (8) of Fig.8-2. Main Causes Silicone oil adhering to the transfer drum. Drum Cleaner Transfer Drum Transfer Drum Adhered silicon oil Transfer Unit Fig.8-7 Countermeasures 1) Wipe off the oil adhering to the transfer unit and its perimeter. 2) Replace the transfer drum with a new one. (See Section 2.8 of Chapter VI.) 3) If the oil adhesion is excessive, replace the OPC belt cartridge and drum cleaner with new ones. (See Section 2.1 and 2.5 of Chapter VI.) VIII-47