Controlling The Movement Of The Secondary Transfer Roller - Canon iR C6800 Series Service Manual

Chapter 7

7.8.7 Controlling the Movement of the Secondary Transfer Roller

0003-1184
The machine moves the secondary transfer outside roller into contact with or away from the ITB for transfer of toner
images from the ITB to paper. The DC controller drives the secondary transfer outside roller shift motor (M20) to
move the roller at the following timing of operation:
1. after primary transfer, the DC controller generates the secondary transfer roller shift motor drive signal so that M20
rotates clockwise for about 0.8 sec.
2. the shift cam rotates clockwise to move down the shift arm (thereby locking the secondary transfer outside roller
in place against the ITB).
3. after secondary transfer, the DC controller generates the secondary transfer outside roller shift motor drive signal
so that M20 rotates clockwise for about 0.8 sec.
4. the shift cam rotes clockwise so that the contact arm is moved up and the secondary transfer outside roller is moved
away from the ITB.
Motor drive
Feeding driver DC-CON
signal
PCB
M20
[3]
[1]
[2]
Locked in position Not locked in position
ITB ITB
[2] [1] [3] [2] [1] [3]
F-7-55
7-60