Oki OF5800 Service Guide - Page 175

White Black Line

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Uneven print density Irregularities White (Black) Line  The toner may be unevenly distributed inside the toner cartridge. Remove the cartridge from the printer and shake it a few times to redistribute the toner inside.  Verify operation of the drum cartridge.  Check for moisture on the drum surface. If moisture is found, allow the drum to dry.  Verify that a clear image is being placed on the drum by printing a document and opening the printer cover before the document completes printing. At this point remove the drum and check for a clear image on the drum. If there is a clear image on the drum, the problem could be caused by poor image transfer. Replace the image transfer unit and/or the high voltage power supply and/or the printer mechanical controller. If the image is poor on the drum, replace the drum and/or print head.  Insure that the paper being used in the unit is dry and has not been exposed to excessive moisture.  Verify that a clear image is being placed on the drum by printing a document and opening the printer cover before the document completes printing. At this point remove the drum and check for a clear image on the drum. If there is a clear image on the drum, the problem could be caused by poor image transfer. Replace the image transfer unit and/or the high voltage power supply and/or the main control board.  If the image is poor on the drum, replace the drum and/or print head.  Clean contact glass if problem occurs in copy mode.  Remove and check the drum and toner cartridge for damage. If required, replace the drum or toner cartridge.  Verify that a clear image is being placed on the drum by printing a document and opening the printer cover before the document completes printing. At this point, remove the drum and check for a clear image on the drum. If there is a clear image on the drum, the problem could be caused by poor image transfer. Replace the image transfer unit and/or the main control board.  If the image is not clear, replace the print head and/or the drum.  Check the fuser roller for damage. If found, replace the fuser unit.

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Uneven print density
The toner may be unevenly distributed inside the toner
cartridge. Remove the cartridge from the printer and
shake it a few times to redistribute the toner inside.
Verify operation of the drum cartridge.
Check for moisture on the drum surface. If moisture is
found, allow the drum to dry.
Verify that a clear image is being placed on the drum
by printing a document and opening the printer cover
before the document completes printing. At this point
remove the drum and check for a clear image on
the drum. If there is a clear image on the drum, the
problem could be caused by poor image transfer.
Replace the image transfer unit and/or the high voltage
power supply and/or the printer mechanical controller. If
the image is poor on the drum, replace the drum and/or
print head.
Irregularities
Insure that the paper being used in the unit is dry and
has not been exposed to excessive moisture.
Verify that a clear image is being placed on the drum
by printing a document and opening the printer cover
before the document completes printing. At this point
remove the drum and check for a clear image on
the drum. If there is a clear image on the drum, the
problem could be caused by poor image transfer.
Replace the image transfer unit and/or the high voltage
power supply and/or the main control board.
If the image is poor on the drum, replace the drum
and/or print head.
White (Black) Line
Clean contact glass if problem occurs in copy mode.
Remove and check the drum and toner cartridge for
damage. If required, replace the drum or toner
cartridge.
Verify that a clear image is being placed on the drum
by printing a document and opening the printer cover
before the document completes printing. At this point,
remove the drum and check for a clear image on
the drum. If there is a clear image on the drum, the
problem could be caused by poor image transfer.
Replace the image transfer unit and/or the main control
board.
If the image is not clear, replace the print head and/or
the drum.
Check the fuser roller for damage. If found, replace the
fuser unit.