Brother HL-4140CN Service Manual page 370

■ Life of toner cartridge
<Method of detecting toner life>
Toner life can be detected by toner sensor and by rotation rates of the develop roller.
"Replace Toner" is displayed on the LCD when the toner sensor detects that toner runs
out, or when the number of rotations of the develop roller reaches the cartridge life end.
- Detection by the toner sensor
This printer 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 developer roller reached its upper limit
This printer has a function to detect when the number of rotations reaches the upper
limit before the developer roller is worn out and becomes unusable.
<Relationship between printable pages of the toner cartridge and remaining toner>
Remaining
toner
Full
Low
Empty
Memo:
When the number of rotations of the developer roller reaches the cartridge life end, "Replace Toner" is
displayed even if toner remains.
The life of toner cartridges when making prints of the print pattern specified by ISO/IEC 19798
is shown in the table below. (At the point of
Toner cartridge
Standard Black
Yellow, Magenta, Cyan
High Black
Yellow, Magenta, Cyan
Super High Black
Yellow, Magenta, Cyan
Normal-duty
(ISO/IEC19798)
High-duty
Toner Empty Toner Empty
2
5-57
Low-duty
Cartridge Life End
in the figure above)
Number of printable pages
2,500
pages
1,500
pages
4,000
pages
3,500
pages
6,000
pages
6,000
pages
pages
Confidential