Canon imageRUNNER 2270, Service Manual

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Chapter 7
7-21
7.8.5 Recovery Sequence
0007-5234
The machine is not equipped with a mechanism to detect the replacement of its toner
cartridge, but is designed to execute toner recovery sequence in response to the following,
assuming that the cartridge has been replaced:
1. the front cover has been opened and closed after the machine has detected the absence of
toner inside the toner cartridge and the developing assembly.
2. the machine has been turned off and then on after it has detected the absence of toner
inside the toner cartridge and the developing assembly.
The machine's recovery sequence is as follows:
1. the machine rotates the toner cartridge motor. (intermittently by rotating it for 3 sec and
stopping it for 2 sec)
2. if the toner level sensor inside the sub hopper detects the "presence of toner," the machine
stops the recovery sequence.
3. after repeating the foregoing intermittent operation 20 times and if the toner level sensor
inside the sub hopper still does not detect the "presence of toner," the machine will
assumes that the toner cartridge has not been replaced and cause the toner cartridge motor
to stop.