Method Of Detecting Toner Life; Relationship Between Toner Amount And Life Of Toner Cartridge In Number Of Rotations Of Develop Roller - Brother MFC-9320CW Service Manual

3.4.3

Method of detecting toner life

This product detects the life of the toner cartridges using the following two means.
■ Detection by the toner sensor
This product has a function to detect the remaining toner by checking the level at which toner
in a cartridge interrupts light using a transmissive light sensor.
■
Detection by means of rotation rates of the develop roller reached its upper limit
This product has a function to stop the operation even if toner remains when the number of
rotation reaches the upper limit before the develop roller is worn out and becomes unusable.
When toner reaches its life, this product notifies the users about it by displaying a message to
that effect on the LCD. There are two messages to indicate toner reaches its life: "Toner Low"
and "Replace Toner." While "Toner Low" is displayed on the LCD when the toner sensor
detects a certain amount of toner is used, "Replace Toner" is displayed on the LCD when the
toner sensor detects that usable toner in a toner cartridge is used up or when the number of
rotations of the develop roller reaches its life.
When "Replace Toner" is displayed on the LCD, no print can be made on this machine until the
toner cartridge in question is replaced with a new one.
3.4.4 Relationship between toner amount and life of toner cartridge in number
of rotations of develop roller
The number of printable pages by a single toner cartridge and upper limit of the number of
rotations of the develop roller are provided in the tables in the previous page. When printing
low-duty documents, however, there is a possibility that the number of rotations of the develop
roller reaches the upper limit, and "Replace Toner" is displayed before toner runs out.
■ Relationship between printable pages of the toner cartridge and remaining toner
Full
Low
Empty
Memo:
When the number of rotations of the develop roller reaches the upper limit, "Replace Toner"
is displayed even if toner remains.
High-duty
Toner Empty
Normal-duty
(ISO/IEC19798)
Low-duty
Toner Empty
2-17
Cartridge Life End
pages
Confidential