Lenovo M720 Manual page 120

Removing a used cartridge
1
Make sure the All-In-One is on.
2
Lift the scanner unit until the scanner support keeps it open.
The print cartridge carrier moves and stops at the loading position
unless the All-In-One is busy.
3
Lift the lid.
4
Remove the old cartridge. Store used cartridges in an air-tight
container or dispose of them.
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