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•Clean the static charge eliminator. (See Chapter 4, “Printer Maintenance.")
•There may be discontinuities in the high-voltage contact points. Clean the high
voltage contact points on the toner cartridge and transfer roller.
•Replace the transfer roller.
Dirt on the Back of the Page
•Use the image defect ruler to determine if the rollers are dirty. If so, clean them.
Replace the rollers if they cannot be cleaned sufficiently.
•Clean the heating element.
Blank Spots
•The paper may not meet HP’s paper specifications. Select different paper
•The moisture content of the paper may be inconsistent, or the paper may have
moist or wet spots on the surface. Try paper from a fresh ream or a different paper
manufacturer.
•Replace the toner cartridge.
•There may be discontinuities in the high-voltage contact points. Clean the high
voltage contact points on the toner cartridge and transfer roller.
•Replace the transfer roller.
•Replace the DC Controller.
White Horizontal Line
•Replace the toner cartridge.
Faulty Registration/Skewed Image
•Unload the paper and re-stack it in the input bin.
•Readjust the guides to the width of the paper.
•Too many sheets of paper may have been loaded into the paper input slot. Load no
more than 100 sheets of paper.
•The paper may not meet HP’s paper specifications. Select different paper.
•Clean the Paper Pickup Roller. If you cannot remove the dirt, the roller may be
worn out. Replace the roller.
•Check separation pad and subpads. If they’re worn, replace them.
•Clean the Delivery Roller. If you cannot remove the dirt, replace the roller.
•Restack the paper in the paper input source and try reprinting the job.
Troubleshooting 7-19