b. Upper/Lower Lifter Motor Control Circuit
The upper/lower tray lifter motor (M3/M14)
control circuit is located on the DC controller PCB.
(See Figure 3-412 for its block diagram.)
The signals from the various sensors and
switches are read by the microprocessor (Q115);
the microprocessor then generates outputs suited
to such signals.
The combination circuit consists of various
logic circuits and generates the up/down switch-
ing signal and the motor ON signal based on com-
binations of signals from the microprocessor.
These two signals are used to operate the
motor drive circuit, thereby rotating the tray lifter
motor (M3, M14) clockwise/counterclockwise or
stopping it.
An overcurrent detecting circuit is used to
check for an overcurrent occurring as a result of a
short circuit in the motor; the circuit forces OFF
the motor ON signal in such cases to turn OFF
the motor.
If the circuit has tuned ON, remove the cause,
and turn OFF and then ON the power switch to
reset.
3. OPERATIONS AND TIMING
COPYRIGHT © 1996 CANON INC.
CANON NP6085 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-96
Motor ON control
signal
Lifter up/down
control signal
Lifter position
signal
Lifter lower limit
signal
Front tray lifter
upper limit
detecting switch
Front tray lifter
position sensor
Front tray door
open/closed
detecting switch
Upper/lower tray motor
24VU
24VU
24VU
Up/down switching signal (FTLUD)
SW17/19
SW14/15
DC controller PCB
M3/14
Combination
circuit
SW16/18
Q19/21
Microprocessor
(Q115)
Front tray
open switch
SWLED
1/2
M
Front tray lifter
lower limit
detecting switch
J105-B 4
-B 8
J111-A11
-B11
J115-A 6
-B14
J115-A 1
J111-B 9
J115-B 5
-B 7
J105-A12
-A14
J115-A13
-A15
Front tray motor ON signal (FTLON)
Low:Up
High:Down
Figure 3-412
Содержание NP6085
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Страница 498: ...COPYRIGHT 1996 CANON INC CANON NP6085 REV 0 JULY 1996 PRINTED IN JAPAN IMPRIME AU JAPON A 5 ...
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