Samsung ML-331X - Manual (Page 58)

60 3. Maintenance
Monitoring the supplies life
To view the supply life indicators, follow the steps below:
1 Press (Menu) on the control panel.
2 Press System Setup > OK > Maintenance > OK.
3 Press Supplies Info > OK.
4 Press OK to select the option you want.
For models that do not support the display screen on the control panel, this feature is not applicable.