2. Deck Limit DetectionWhen the lifter reaches the lifter position sensor (PS31/PS34), the deck lifter positionsignal is sent to the microprocessor on the DC controller, causing the microprocessor tostop the deck lifter drive motor (M18/M19).The deck limit sensor (PS37/PS39) is provided in consideration of such cases aswhen the motor fails to stop for some reason.When the deck limit sensor (PS37/PS39) detects the deck, the deck limit signal issent to the limit detection circuit on the DC controller PCB. In response, the limit detect-ion circuit cuts off the deck drive signal coming from the microprocessor. (See Figure 5-306.)Figure 5-306 Deck Limit DetectionDeck drivesignalDC controller PCBPS31/PS34M18/M19PS37/PS39Deck positionsensorDeck lifterdrive motorDeck limitsensorMicro-processor Limit detectioncircuitCHAPTER 5 PICK-UP/FEEDING SYSTEM5-18 COPYRIGHT © 1997 CANON INC. CANON NP6560/NP6360/NP6260 REV. 0 NOV. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
