Canon PC400 Service Manual - Page 48

CHAPTER 3 EXPOSURE SYSTEM 3. Mechanism of Copyboard Drive Assembly The forward gear and reverse gear are rotating in the direction of the arrow (Figure 103B) while the main motor (M1) is operating. The forward/reverse switching mechanism engages with either the forward gear or the reverse gear depending on the orientation of the copyboard position sensor lever and the state (ON/OFF) of the copyboard drive solenoid (SL2) operated by the start position cam or reversal cam; when not engaged, the mechanism is said to be free, and the copyboard can be moved by hand. The above mechanism is used to move the copyboard forward and reverse or to stop it. Copyboard (rack) Forward/Reverse switching mechanism Reversing gear Forward Start position cam Reverse Copyboard position lever Copyboard drive gear (pinion) Forward gear Main motor gear Reversing cam Copyboard drive M1 Main motor solenoid (SL2) Figure 3-103B Copyboard drive solenoid (SL2) Copyboard position sensor lever Down Up ON forward reverse OFF stop (free) Note: i. The direction (forward/reverse) is switched when the copyboard drive solenoid is OFF. ii. The direction of the drive is maintained while the copyboard drive solenoid is ON. Table 3-102B 3-4 COPYRIGHT © 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)