Phaser 6280 Color Laser Printer Service Manual 5-23Print-Quality TroubleshootingRepeating Defect MeasurementWhen horizontal lines and/or spot occur periodically, it is possibly caused bythe trouble of particular roller. Measure the trouble interval on the test print,and check the relation to the Roller in the table. The interval does notnecessary match circumference of the Roller.Horizontal Line and Spot Trouble MeasurementRoll Interval ReplacementPart ListNumberDrum 75.4 mm Print Cartridge (C/M/Y/K) PL5.1.18-21BCR 28.3 mm Print Cartridge (C/M/Y/K) PL5.1.18-21BCR Cleaner Roll 25.1 mm Print Cartridge (C/M/Y/K) PL5.1.18-21Sleeve (K) 27.9 mm Print Cartridge (K) PL5.1.19Sleeve (Y/M/C) 27.9 mm Print Cartridge (C/M/Y) PL5.1.18-211st BTR 31.4 mm Transfer Unit PL4.1.1Drive Roll 56.9 mm Transfer Unit PL4.1.1Fuser Roll 82.7 mm Fuser Assembly PL6.1.10Fuser Belt 94.2 mm Fuser Assembly PL6.1.10Pinch Roll 18.8 mm Fuser Assembly PL6.1.10Exit Roll 43.1 mm Fuser Assembly PL6.1.10Exit Pinch Roll 31.4 mm Fuser Assembly PL6.1.10s6280-162Transfer UnitLaser UnitFuserDrumBCRBCR Cleaner RollerMagnet RollerBTRESA RollerDrive RollerHeat RollerFuser BeltPinch RollerExit RollerExit Pinch RollerBTRBTRBTRPrint Cartridge (C)Print Cartridge (K)Print Cartridge (M)Print Cartridge (Y)