Ref. 2-14 Confidential
3.4 Toner Cartridge
3.4.1 Methods for Detecting and Counting Toner Life
“Toner Life End” is displayed in one of two ways. First is when detection is performed by the
toner sensor; Second is when the rotation rate of the develop roller reaches its upper limit.
(1) Detection by the toner sensor
The amount of toner remaining can be detected by checking the imperviousness to light
of the toner in the cartridge by means of the transmissive photosensor.
(2) Detection by means of rotation rates of the develop roller reached its upper limit
The upper limit of such rotation rates can be detected before the develop roller becomes
unusable due to wear.
<When a new toner cartridge is inserted>
<When a used toner cartridge is inserted BEFORE “Toner Life End” is displayed>
<When a used toner cartridge is inserted AFTER “Toner Life End” is displayed>
A count value before changes is continuously indicated as a rotation rate of the develop
roller. Irrespective of the amount of toner, printing becomes disabled when the rotation rate
reaches the upper limit.
Corresponding counter, Setting value Operation
Counter of toner cartridge changes +1
Page counter for each toner cartridge Reset (0)
Coverage for each toner cartridge Reset (0)
Developing bias voltage Reset (Initial setting)
Corresponding counter, Setting value Operation
Counter of toner cartridge changes No count up
Page counter for each toner cartridge Continued
Coverage for each toner cartridge Continued
Developing bias voltage Continued (The print may fade.)
Corresponding counter, Setting value Operation
Counter of toner cartridge changes No count up
Page counter for each toner cartridge Continued
Coverage for each toner cartridge Continued
Developing bias voltage Continued
