Ricoh FW770 Operating Instructions Manual page 102

Open the toner cartridge cover.
Turn the old cartridge towards you.
Then, while pressing the cartridge to the right,
lift the left end and remove the cartridge.
Put the old toner cartridge in a vinyl bag and
dispose it according to local regurations for
plastics.
Shake the new toner cartridge lightly 5 to 6
times to remove lumps.
Install the new cartridge. Make sure that the
white circle labeled 1 on the cartridge faces
up.
Make sure the cartridge is set well but don't
push it in yet.
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