Oki MC860 User Manual page 144

It will be necessary to remove the four image drums to gain access to the paper path.
6. Holding it by its top centre, lift the cyan image drum, complete with its toner
cartridge, up and out of the printer.
7. Put the cartridge down gently onto a piece of paper to prevent toner from marking
your furniture and to avoid damaging the green drum surface.
The green image drum surface at the base of the cartridge is very
delicate and light sensitive. Do not touch it and do not expose it to
normal room light for more than 5 minutes. If the drum unit needs
to be out of the MFP for longer than this, please wrap the cartridge
inside a black plastic bag to keep it away from light. Never expose
the drum to direct sunlight or very bright room lighting.
8. Repeat this removal procedure for each of the remaining image drum units.
CAUTION!
Troubleshooting > 144