Detecting The Level Of Toner - Canon iR2200 Service Manual

7.3 Detecting the Level of Toner

A toner sensor (S1) of a piezoelectric oscillation type is mounted inside the developing
assembly for detection of the level of toner. The DC-CPU on the DC controller PCB reads
the output of the toner sensor as long as the developing clutch (CL3) remains on; it keeps
track of the '0' state of the toner sensor (most recent two readings), and indicates the Add
Toner message as needed.
Toner absent level 1
Check point
Developing clutch
(CL3)
Toner sensor(S1)
COPYRIGHT © 2001 CANON INC.
The cumulative period of
absence of toner fro the
most recent two readings
is 7 sec or more,
Copying
enabled
FAX reception enabled
FAX transmission enabled
Printer output enabled
(6 sec in total)
4 sec
2 sec
When the main power switch is turned off and then on, stirring
operation is undertaken for 6 sec and is monitored; if toner is
present, stirring takes place. If no toner is detected, stirring
operator is undertaken for another 30 sec; then, stirring operation
is undertaken once again for 6 sec to check the presence of toner;
if toner is found, recovery is made. If toner is not found, the Add
Toner message will be indicated.
2000 2000 2000 2000
CHAPTER 4 IMAGE FORMATION SYSTEM
toner absent level 2
The cumulative period of
absence of toner for the
most recent two readings
is 20 sec or more,
Copying
FAX reception
FAX output
Printer output
NG
OK OK
(8 sec in total) (5 sec in total)
1 sec
4 sec
F04-703-01
CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001
disabled
enabled
disabled
disabled
NG
(23 sec)
22 sec
4-21 P