2-7
Confidential
Part name Operation
Toner sensor Detects the toner remaining in the cartridge. When the toner is 
below the specified level, the user is notified that the toner 
cartridge needs replacing soon.
New toner sensor Detects the toner volume when a new toner cartridge is set. 
(Does not react to the starter toner cartridge even if it is new.)
When a new toner cartridge is detected, the developer roller 
counter and the developing bias voltage value are reset, and 
the toner cartridge replacement counter increases by one.