Canon PC980 Service Manual - Page 127

CHAPTER 5 PICK-UP/FEEDING SYSTEM B. Controlling the Pickup Roller 1. Outline The machine has three types of pickup rollers, i.e., cassette pickup roller, multifeeder pickup roller, and single-feeder pickup roller, and each of these rollers are operated by the drive of the main motor switched by means of a gear unit. (In other words, only one roller is driven at any one time.) 2. Controlling the Cassette Pickup Roller The cassette pickup roller is controlled by a spring clutch, control ring, pickup clutch solenoid (SL1), and cassette pickup solenoid (SL5). When the pickup clutch solenoid turns on, the claw moves away from the control ring, allow- ing the drive to move to the pickup gear assembly through the spring clutch. Then, when the cassette pickup solenoid turns on, the drive reaches the cassette pickup roller. When the cassette pickup roller starts to rotate, copy paper is picked up from the cassette and is sent as far as the registration roller by way of the vertical path roller. The registration roller controls paper so that its leading edge will match the leading edge of the image on the photosensitive drum. DC controller PCB Spring Gear Pickup roller Pickup roller gear Arm SL1 When SL5 turns on, the spring causes the pickup roller to rotate slightly, M1 causing the gear and the pickup roller gear to engage. Cassette pickup solenoid drive signal (CPUSD*) Pickup clutch solenoid drive signal (PUSLD*) Pickup clutch SL5 Copy paper Cassette pickup rollers Figure 5-103 (Multifeeder type) COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 5-3