Detecting The Presence/Absence Of A Cartridge And The Level Of Toner; Outline - Canon iR1600 Service Manual

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 assem-
bly 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
DC controller PCB
ASIC
TNRCHKD
CPU
TNRCHKT
of toner.
COPYRIGHT© 2002 CANON INC.
Developing bias
generation circuit
2000 CANON iR1600/iR2000 REV.1 JAN. 2002
CHAPTER 5 IMAGE FORMATION SYSTEM
Developing bias
detection circuit
Toner level
detection circuit
Dv TB403/TB404
To developing
cylinder
Ant TB405/TB406
From toner
level sensor
5-11