Oki C130n Instruction Manual page 101

Important!
Do not touch the PC drum and the transfer belt on the imaging
cartridge.
Position the removed imaging cartridge horizontally as shown in
the illustration.
Be sure to keep the imaging cartridge horizontal and place it where
it will not become dirty.
Do not leave the imaging cartridge removed for more than 15
minutes, and do not place the removed imaging cartridge in a
location where it would be exposed to direct light (such as
sunlight).
101 - C130n User's Guide