Brother International HL-2600CN Service Manual - Page 335

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 optical unit 2 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 optical unit 2. 3) Clean the dustproof glass. (See Section 1.2.5 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 2. Transfer drum 2 Drum cleaner 2 Transfer drum 2 Adhered silicon oil Transfer unit 2 Fig.8-7 Countermeasures 1) Wipe off the oil adhering to the transfer unit 2 and its perimeter. 2) Replace the transfer drum 2 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 2 with new ones. (See Section 2.1 and 2.5 of Chapter VI.)