HP LaserJet 5L Service Manual - Page 140

7 Troubleshooting Dots • 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