Canon Comprehensive Guide to IR2200 Toner Detection System

CHAPTER 4 IMAGE FORMATION SYSTEM

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 2

Toner absent level 1

The cumulative period of

The cumulative period of

absence of toner for the

most recent two readings

absence of toner fro the

is 20 sec or more,

most recent two readings

is 7 sec or more,

Copying

disabled

Copying

enabled

FAX reception

enabled

FAX reception

enabled

FAX output

disabled

FAX transmission

enabled

Printer output

disabled

Printer output

enabled

OK

NG

OK

NG

Check point

(6 sec in total)

(8 sec in total) (5 sec in total)

(23 sec)

Developing clutch

(CL3)

2 sec

4 sec

4 sec

1 sec

22 sec

Toner sensor(S1)

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.

F04-703-01

COPYRIGHT © 2001 CANON INC. CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001 4-21 P