Canon PC980 Service Manual - Page 130

CHAPTER 5 PICK-UP/FEEDING SYSTEM 4. Controlling the Multifeeder Pickup Roller The multifeeder pickup roller is controlled by a spring clutch, control ring, pickup clutch sole- noid (SL1), gear unit, and multifeeder pickup solenoid (SL4). When the multifeeder pickup solenoid (SL4) turns on, the drive of the main motor (M1) reaches the cam gear. When the cam gear starts to rotate in response, the lifter, which is in contact with the cam, moves up the gear unit and, at the same time, pushes down the paper guide plate. The cam gear makes a 180° turn (approximate), and stops at the toothless section. When the pickup solenoid turns on in this condition, the claw leaves the control ring, and the drive of the main motor (M1) reaches the multifeeder pickup roller. When the multifeeder pickup roller rotates, paper is picked up and sent as far as the registration roller, which controls the paper so that its leading edge will match the leading edge of the image on the photosensitive drum. DC controller PCB Multifeeder pickup solenoid drive signal (MFSLD*) Pickup clutch solenoid drive signal (PUSLD*) M1 SL4 Cam gear Paper guide plate SL1 Copy paper Spring clutch Cam gear Control ring Claw Lifter Paper guide plate Multifeeder pickup roller Toothless section The cam gear makes a 180˚ turn (approximate), causing the paper guide plate to move up and down. Figure 5-106 5-6 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)