Canon NP6085 Service Manual page 151

3. Upper/Lower Lifter Movement
a. Outline
The lifter for the upper or the lower tray starts
to move up when the tray is pushed inside the
copier and, as a result, the tray open/closed
detecting switch (SW14, SW15) is pressed; it
stops where the lifter position sensor (Q19, Q21)
detects the top surface of the copy paper on the
lifter.
When copy paper runs out and the sensor arm
blocks the tray paper absent sensor (Q20, Q22),
"Add Paper" will be indicated on the control panel,
Tray paper length detection upper
(SW25 for upper/SW29 for lower)
Tray paper length detection lower
(SW24 for upper/SW28 for lower)
Lifter
Tray case
COPYRIGHT © 1996 CANON INC.
Tray releasing solenoid
(SL12 for upper/SL13 for lower)
Pick-up roller
Tray paper absent sensor
(Q22 for upper/Q20 for lower)
Tray lifter position sensor
(Q21 for upper/Q19 for lower)
Figure 3-409 (arrangement of sensors)
CANON NP6085 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
and the lifter will be stopped. The upper limit
detecting switch (SW16, SW18) is used in the
event that the tray paper absent sensor (Q20,
Q22) fails to operate for some reason and, as a
result, the lifter fails to stop moving up.
The lifter starts to move down when the tray
open switch is pressed and keeps moving until
the cam of the lifter presses the lower limit detect-
ing switch (SW17, SW19).
Tray open/closed detection
(SW14 for upper/SW15 for lower)
Sensor arm
Tray open switch
(SWLED1 for upper/SWLED2 for lower)
3. OPERATIONS AND TIMING
Tray paper volume sensor
(Q58 for upper/Q40 for lower)
Lifter upper limit detection
(SW16 for upper/
SW18 for lower)
Tray paper width
detection upper
(SW22 for upper/
SW26 for lower)
Tray paper width
detection lower
(SW23 for upper/
SW27 for lower)
Lifter lower limit detection
(SW17 for upper/SW19 for lower)
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