Canon Image Reader-A1 iR5000i Service Manual page 278

CHAPTER 4 IMAGE FORMATION SYSTEM
The following signals are used:
[1] hopper stirring motor drive signal; when '0', the motor rotates to stir the toner.
[2] hopper supply motor drive signal; when '0', the motor rotates to supply toner.
[3] developing assembly clutch drive signal; when '0', the developing assembly clutch turns
on.
4-38 P
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