CHAPTER 5 IMAGE FORMATION SYSTEM
COPYRIGHT© 2002 CANON INC.
2000
CANON iR1600/iR2000/iR1610/iR2010 SERIES REV.0 MAR. 2002
5-11
5 Detecting the Presence/Absence of a Cartridge and
the Level of Toner
5.1 Outline
A toner level sensor is mounted inside the developing assembly.
The machine uses the output (Ant) of the toner level sensor inside the developing as-
sembly and the output level (Dv) of the developing bias in various detection circuits for A/
D conversion.
The CPU checks the difference in level between the cartridge detection signal
(TNRCHKD) and the toner detection signal (TNRCNKT) after A/D conversion when the
developing bias is applied, thus finding out the presence/absence of cartridge and the level
of toner.
F05-501-01
TB403/TB404
Dv
TB405/TB406
Ant
TNRCHKT
TNRCHKD
To developing
cylinder
From toner
level sensor
DC controller PCB
Developing bias
generation circuit
ASIC
CPU
Developing bias
detection circuit
Toner level
detection circuit
Содержание iR2000 Series
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