Cartridge Detection; Operation; Vii. Cartridge Detection - Canon GP160F Service Manual

VII. CARTRIDGE DETECTION

A.

Operation

The circuit for detecting whether or not there is a cartridge, and the volume of toner
in the cartridge, is shown in the diagram below.
The DC controller PCB's CPU (IC301) compares the developing bias AC (TNRCHKD)
which has been sent from the developing bias generation circuit and the output signal
(TNRCHKT) which has been output from the antenna inside the cartridge, and, judges
whether there is a toner cartridge, and also the level of toner in the cartridge.
When the developing bias is applied to the developing cylinder, the CPU checks the
difference between the 2 signals and judges whether there is a toner cartridge, and also
the level of toner in the cartridge.
Furthermore, the volume of remaining toner is regularly monitored when the devel-
oping bias is being applied, but the presence of the cartridge is only monitored when
developing bias is being applied during the initial rotation.
Toner cartridge
COPYRIGHT © 1999 CANON INC.
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[1] TNRCHKT: Developing bias AC output
Figure 6-701
CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 IMAGE FORMATION SYSTEM
DC controller PCB
Developing
[1] TNRCHKD
bias gene-
ration circuit
Antenna
[2] TNRCHKT
output detection
circuit
[2] TNRCHK: Antenna output signal
CPU
(IC301)
6-9