HP LaserJet 6p/mp Service Manual - Page 133
Dark background, Dirt on the back of the Blank spots, Replace the Laser/Scanner unit.
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Dark background l Adjust the toner density setting through your software or printer driver. l There may be discontinuities in the high-voltage contact points. Clean the high voltage contact points on the toner cartridge and transfer roller. l Replace the Laser/Scanner unit. l Replace the DC Controller. Dots l Clean the static charge eliminator. (See Chapter 4, "Printer Maintenance.") l There may be discontinuities in the high-voltage contact points. Clean the high voltage contact points on the toner cartridge and transfer roller. l Replace the transfer roller. Dirt on the back of the page l 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. l Clean the heating element. Blank spots l The paper may not meet HP's paper specifications. Select different paper. l 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. l Replace the toner cartridge. l There may be discontinuities in the high-voltage contact points. Clean the high voltage contact points on the toner cartridge and transfer roller. l Replace the transfer roller. l Replace the DC Controller. EN Image formation troubleshooting 131