Canon iR7086 Series Service Manual page 270

Chapter 7
If a toner absent condition is identified
for 0.3 sec or more, the toner supply
sequence is started.
Developing assembly
toner sensor
Magnet roller
If continuously supplied, overflow will be a
possibility with the stop not taking place in time.
The following shows the sequence used to supply toner from the sub hopper to the buffer:
If a toner absent condition is detected
for 0.5 sec or more, the toner supply
sequence will be started.
Buffer toner sensor
Buffer toner lower limit sensor
Sub hopper feedscrew
If a toner absent condition is detected for 60 sec or more
with the sub hopper toner sensor detecting a toner absent
condition for 90 sec or more in continuous printing mode,
a message will appear on the touch panel to indicate the
absence of toner, and the machine will stop operation.
The machine uses the following sequence of operations to move toner from the toner bottle to the sub hopper:
7-24
If the toner supply sequence is not finished at the end of machine operation,
the sequence will be resumed during the next operation.
If a toner present condition is detected for 0.7
sec or more, the toner supply sequence is ended.
Toner supply
sequence started
Toner supply
2 sec
0.3 sec
Supply
Supply
If a toner absent condition is detected for 20
sec or more, indicates error code E020.
F-7-33
If the toner supply operation is not finished at the end of
machine operation, the operation will be continued until
the sequence is over.
If a toner present condition is detected for
0.5 sec or more, the toner supply sequence
will be ended.
Toner supply sequence
started
Toner supply
90 sec
60 sec
Supply
If a toner absent condition is detected for 60 sec or
more when image output is started immediately after
replenishment of the toner bottle, a message
will be indicated on the touch panel for a supply of toner,
and the machine operation will be stopped.
F-7-34
STBY
Supply
STBY