Deck Limit Detection - Canon NP6251 Service Manual

CHAPTER 5 PICK-UP/FEEDING SYSTEM

2. Deck Limit Detection

When the lifter reaches the lifter position sensor (PS31/PS34), the deck lifter position
signal is sent to the microprocessor on the DC controller, causing the microprocessor to
stop the deck lifter drive motor (M18/M19).
The deck limit sensor (PS37/PS39) is provided in consideration of such cases as
when the motor fails to stop for some reason.
When the deck limit sensor (PS37/PS39) detects the deck, the deck limit signal is
sent to the limit detection circuit on the DC controller PCB. In response, the limit
detection circuit cuts off the deck drive signal coming from the microprocessor. (See
Figure 5-306.)
DC controller PCB
Micro-
processor
Figure 5-306 Deck Limit Detection (2 cassettes + left/right deck)
5-18
COPYRIGHT © 1997 CANON INC.
Deck drive
signal
Limit detection
circuit
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
Deck position
PS31/
sensor
PS34
Deck lifter
M18/
drive motor
M19
Deck limit
PS37/
sensor
PS39