Oki OF5800 Service Guide - Page 174

Black s, Printout too light, Blurred background

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Black pages Printout too light Printout too dark Blurred background  Verify that the drum and toner cartridge are installed properly.  Remove the drum cartridge and clean the contacts on the toner cartridge inside the unit. If the problem persists, replace the drum.  Replace the drum cartridge.  Replace the print head unit.  Replace the high voltage power supply.  Replace the printer mechanical controller  Replace the printer interface pcb.  Replace the main control board.  Remove the Toner Cartridge and shake it a few times to redistribute the toner inside.  Remove the drum cartridge and clean the contacts on the toner cartridge inside the unit. If the problem persists, replace the drum.  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 and/or the main control board.  Remove the Toner Cartridge and shake it a few times to redistribute the toner inside. If the problem persists, replace the Toner Cartridge.  Verify operation of the drum unit.  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 and/or the printer mechanical controller.  Insure the drum and toner cartridge are installed correctly.  Replace drum cartridge.  Remove the toner cartridge and clean the contacts on the toner cartridge and inside the unit. If the problem persists replace the toner cartridge.  Replace the high voltage power supply.  Replace the printer mechanical controller pcb.  Replace the main control board.

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Black pages
Verify that the drum and toner cartridge are installed
properly.
Remove the drum cartridge and clean the contacts on
the toner cartridge inside the unit. If the problem
persists, replace the drum.
Replace the drum cartridge.
Replace the print head unit.
Replace the high voltage power supply.
Replace the printer mechanical controller
Replace the printer interface pcb.
Replace the main control board.
Printout too light
Remove the Toner Cartridge and shake it a few times
to redistribute the toner inside.
Remove the drum cartridge and clean the contacts on
the toner cartridge inside the unit. If the problem
persists, replace the drum.
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
and/or the main control board.
Printout too dark
Remove the Toner Cartridge and shake it a few times
to redistribute the toner inside. If the problem persists,
replace the Toner Cartridge.
Verify operation of the drum unit.
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 and/or the
printer mechanical controller.
Blurred background
Insure the drum and toner cartridge are installed
correctly.
Replace drum cartridge.
Remove the toner cartridge and clean the contacts on
the toner cartridge and inside the unit. If the problem
persists replace the toner cartridge.
Replace the high voltage power supply.
Replace the printer mechanical controller pcb.
Replace the main control board.