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COPYRIGHT
©
2001 CANON INC. 2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001
CHAPTER 4 IMAGE FORMATION SYSTEM
4-21 P
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.
F04-703-01
Developing clutch
(CL3)
Check point
Toner sensor(S1)
2 sec
4 sec
4 sec
22 sec
NG
(8 sec in total)
OK
(6 sec in total)
OK
(5 sec in total)
NG
(23 sec)
Toner absent level 1
Copying
FAX reception
FAX transmission
Printer output
enabled
enabled
enabled
enabled
toner absent level 2
The cumulative period of
absence of toner fro the
most recent two readings
is 7 sec or more,
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
disabled
enabled
disabled
disabled
1 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.