OKIDATA OKIPAGE 20, Service Manual

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Developing roller 2.05" (52.1 mm) Replace the image drum cartridge.
Toner supply roller 3.24" (82.24 mm) Replace the image drum cartridge.
Charging roller 1.37" (34.7 mm) Replace the image drum cartridge.
Cleaning roller 1.17" (29.8 mm) Replace the image drum cartridge.
Transfer roller 2.28" (58 mm) Replace the transfer roller.
Heat roller 3.46" (88 mm) Replace the fusing unit assy.
Back-up roller 3.46" (88 mm) Replace the back-up roller.
Notes:
1. After replacing the image drum cartridge, set the printer in the user maintenance mode by turning the
power on while pressing the MENU key, and reset the drum counter. (Refer to User's Manual.)
2 After replacing the fusing unit assy, set the printer in the engine maintenance mode by turning the power
on while pressing the FORM FEED and ENTER keys, and reset the fuser counter. (Refer to See 4.1.)