Canon imageRUNNER ADVANCE C5051 Series Service Manual page 94

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Technology■>■Image■Formation■System■>■Controls■>■Transfer/separation
● Secondary■transfer■bias■control ■
This■control■transfers■toner■on■the■ITB■to■the■paper.
The■secondary■transfer■bias■(DC),■which■has■been■generated■by■HVY3■(UN18),■is■applied■to■
the■secondary■transfer■outer■roller.
Bias■value■is■determined■by■the■measurement■value■of■environment■sensor■2■(UN50)■and■the■
paper■type.
Drive roller
(steering roller)
2 Technology■>■Image■Formation■System■>■Controls■>■Transfer/separation
DC controller(UN1)
HVT3 (UN18)
DC
Secondary transfer outer roller
F-2-86
● ITB■displacement■correction■control ■
This■control■prevents■damage■on■the■ITB■due■to■displacement■of■the■ITB.
Execution■timing
When■the■ITB■is■rotated
Control■description
1)■The■ITB■displacement■sensors■(PS25■to■28)■detect■displacement■of■the■ITB.
2)■Drive■of■the■ITB■displacement■control■motor■(M14)■rotates■the■cam.
The■cam■position■is■detected■by■the■steering■position■sensor■(PS24).
3)■Rotation■of■the■cam■moves■the■drive■shaft■up/down■to■tilt■the■steering■roller.
4)■Tilt■of■the■steering■roller■generates■tension■difference■of■the■ITB■to■move■the■ITB■to■the■front■
or■rear.
5)■Repeating■steps■1)■through■4)■corrects■displacement■of■the■ITB.
ITB steering
position sensor(PS24)
ITB displacement control
motor(M14)
ITB displacement
sensor2(PS26)
ITB displacement
sensor1(PS25)
Drive roller
(steering roller)
ITB displacement
sensor3(PS27)
ITB displacement
sensor4(PS28)
Sensor flag
Support arm
2-58
Drive shaft
Cam
ITB
F-2-87
2-58