Canon Color imageRUNNER C4580 Service Manual - page 286
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851
Chapter 9
9-45
9.7.5 Controlling the Supply of Toner
1. Developing Assembly
When the ATR sensor detects the low toner level within the developing assembly, toner supply control from the
toner receptacle to the developing assembly is carried out.
The toner supply level is determined by detecting the revolution of the toner supply screw using the toner supply
screw revolution sensor inside the toner receptacle.
Toner supply level to the developing assembly per 1 revolution of the screw is constant. Therefore, the toner
level is calculated by cumulated revolution number.
F-9-39
Developing assembly
Toner container (Y)
DC controller PCB
J124
J126
Toner feedscrew
Y drum unit
M20
ATR sensor