174 Chapter 9 Image quality EN
• The page length and margins are not set correctly for the paper size.
Verify that the ribbon connector at J1307 of the HVPS is properly
seated.
• If the HVPS has been removed recently, verify that the ribbon
connector from the DC controller PCA to the HVPS is properly
seated at both ends.
• Verify that the photoconductive drum is rotating properly. Perform
the drum diagnostic test to visually observe if the drum is rotating or
using a felt-tipped marker place an index mark on the edge of the
drum outside the image area. Turn on the printer (wait for drum
rotation to occur) then look to see if the drum has moved. If the drum
has not moved, investigate the mechanical and electrical drum
rotation circuitry and movement mechanisms.
• The imaging drum shutter may not be retracting. Replace the
imaging drum.
• The paper does not meet HP paper specifications or is stored
improperly.
• The toner cartridge is defective.
• The transfer roller is dirty or defective.
• Use paper that meets HP paper specifications.
– The surface of the paper is too rough or the paper’s surface is
too smooth for proper toner adhesion.
– Printing is on the wrong side of the paper.
– The transparencies are not designed for proper toner adhesion.
– The transfer roller is defective.
– The laser scanner assembly is defective.
Blank spots
Character voids
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