43856301TH Rev.3 184 /Oki Data CONFIDENTIAL 7. Troubleshooting and repair procedure7.5.3.(4) Black banding/black streaking in vertical direction(4-1) Thin vertical line (with color) (Refer to Figure 7-2D.)Check item Check work Action to be takenat NG(4-1-1) ID unit conditionFilming of the IDunitIs print attempted without toner? Replace tonercartridge withnew one. Ifreplacementdoes not solvethe problem,replace theID unit. If anyattempt of usingnew ID unit asa trial is goingto be made,be sure to usethe SystemMaintenanceMenu FUSEKEEP MODE.(4-2) Thin vertical line (without color) (Refer to Figure 7-2F.)Check item Check work Action to be takenat NG(4-2-1) LED head conditionLED head Is any foreign material attached on the lightemitting surface of the cell fox lens of the LEDhead?Remove theforeign material.(4-2-2) Condition of paper running pathPaper running path Check that any burr that may scatter the un-fused toner on the paper running path does notexist.Remove theburr.7.5.3.(5) Cyclic abnormality (Refer to Figure 7-2E.)(5-1) Cyclic abnormality occurs in vertical directionCheck item Check work Action to be takenat NG(5-1-1) CycleImage drum Check that the cycle is 94.3 mm. Replace the IDunitDeveloping roller Check that the cycle is 39.7 mm. Replace the IDunitToner feed roller Check that the cycle is 58.4 mm. Replace the IDunitCharge roller Check that the cycle is 37.7 mm. Replace the IDunitRoller on top of fuser Check that the cycle is 87.7 mm. Replace the fuserunit.Fuser belt Check that the cycle is 125.5 mm. Replace the fuserunit.Transfer roller Check that the cycle is 50.3 mm. Replace the beltunit.If any attemptof using newconsumableitem as a trialis going to bemade, be sure touse the SystemMaintenanceMenu FUSE KEEPMODE.
