Controlling The Itb Cleaner Shifting Mechanism - Canon iR C6800 Series Service Manual

Chapter 7

7.8.4 Controlling the ITB Cleaner Shifting Mechanism

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The machine moves the ITB cleaner to and from the ITB for removal of toner remaining on the ITB. To bring the
cleaner into contact with the belt, the DC controller drives the ITB cleaner shift motor (M21) at the following timing
of operation:
1. immediately after the start of secondary transfer, the DC controller generates the ITB cleaner shift motor drive
signal so that M21 rotates clockwise for about 0.8 sec.
2. the shift cam rotates clockwise, raising the shift arm (thereby locking the ITB cleaner in place against the ITB).
3. when cleaning of the ITB is done, the DC controller generates the ITB center shift motor drive signal so that M21
rotates clockwise for about 0.8 sec.
4. the shift cam rotates clockwise so that the shift arm lowers (thereby causing the ITB cleaner to move away from
the ITB).
DC-CON
J1108A
M21
[3] [2]
[1]
Engagement
Disengagement
[3] [3]
[2]
[1] [1]
[2]
F-7-52
1 ITB cleaner
2 Shift cam
3 Shift arm
M21: ITB cleaner shift motor
DC CON: DC controller
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