Diagnostic information 2-67
5056-XXX
Black print
Missing colors
Uneven printing
Possible cause Action
High voltage unit (HVU) The printed paper has black print. Be sure the high voltage unit is
properly connected. If the problem remains, replace the high voltage
unit.
Sub-frame If the problem remains, replace the right sub-frame contacts.
Photodeveloper drum set If the problem remains after replacing the sub-frame, be sure the
photodeveloper has clean contacts. If necessary, replace the
photodeveloper.
Possible cause Action
• Toner cartridge unit
• Photodeveloper
Be sure the toner cartridge and the PC drum unit are properly seated.
Be sure the contacts on the print unit are clean. Be sure the print unit is
installed in the correct position. Run a print test.
If the problem remains, switch the toner cartridge with another color
and run a test print. If the new color prints, replace the failing toner
cartridge.
High voltage unit If the problem remains, check the connector on the high voltage unit.
Replace the high voltage unit If the problem remains. Are all the screws
on the high voltage unit in place?
LED printhead unit If the problem remains, replace the printhead and EPROM.
LED printhead controller board If the problem remains, replace the printhead controller board.
High voltage unit (HVU) If the problem remains, replace the high voltage unit.
Transfer belt unit If the problem remains, replace the transfer belt unit.
Possible cause Action
Photodeveloper Check for condensation or dirt on the photodeveloper.
LED printhead Clean any dirt off the exposed surface of the LED printhead. Also check
the locating pins of the printhead.
Transfer belt unit Be sure the transfer belt is clean and not damaged. Replace parts as
necessary.
Top cover Be sure the top cover is fully locked.
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