Oki OKICOLOR 59296702 Handy Reference page 46

Colors are shifted or not lined up
properly.
Reason:
Color registration is incorrect.
Solution:
Color registration needs to be reset. See "Color Registration."
It is recommended that you reset color registration when you
change toner or image drums, when you load paper in the
paper tray, or if you move the printer.
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46 OKICOLOR 8
Blank sheets printed/one or more
colors missing.
Reason:
Empty or missing toner cartridge.
Solution:
Install new toner cartridge.
Reason:
Image drum contacts may have failed.
Solution:
Remove the appropriate image drum(s) and examine the
contacts on the left side of the drum and on the left side inside
the printer. Clean them if necessary, then reinstall the image
drum(s).
Reason:
LED array connection may have failed.
Solution:
Contact your service representative.