Oki C110 Instruction Manual page 48

Note Befor opening the front cover, open Tray 1 if it is not already open.
4
Check that the toner cartridge to be replaced has been moved to the front.
Note You can identify the toner cartridge by the color of the handle.
5
Pull down the handle on the toner cartridge until the toner cartridge is
unlocked and moves out slightly toward you.
48 - C110 User's Guide