Canon ImageRunner 600 Service Manual page 202

The hopper supplies the developing assembly with toner as follows:
The toner supply sequence is started
when the absence of toner is detected
for 0.3 sec or more.
Toner sensor
(inside the
developing
assembly)
Magnet roller
If supply is continued without an
interruption, toner can start to overflow
(missing the timing for suspension).
COPYRIGHT © 2000 CANON INC.
If the toner supply sequence has not ended at the time the
machine operation ends, the toner supply sequence will be
resumed next time machine operation is started.
The toner supply sequence is
ended if the presence of toner is
detected for 0.7 sec or more.
Toner supply
sequence started
Toner supply
2sec
1sec
Supply
Figure 6-407 Sequence of Operations
CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
CHAPTER 6 IMAGE FORMATION SYSTEM
Supply
Supply
If the absence of toner is detected for
90 sec, E020 will be indicated.
STBY
6-43