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SSS
a
es
COP ATONS ANB TIMING LZ
F. Controlling the Pick-Up
Motor
Motor drive
jotor drive | Pick-up roller
1.
Outline
signal (PMO) | signal (PM1)
rotation
Figure 3-720 is a diagram of the control
Braked
circuit for the pick-up motor (M2).
"a
Picking up
The pick-up motor is a DC motor.
The CPU
(Q1) on the ADF controller
PCB sends the motor drive signals PMO and
PM1 to the motor driver (Q5). The pick-up
motor rotates clockwise or counterclockwise
according to the combinations of the states
of these two signals. (Table 3-702 shows
how the pick-up motor rotates for each com-
bination.)
The motor driver is equipped with a lim-
iter function, preventing overcurrent from
flowing into the motor. When an overcurrent
occurs, the limiter function cuts off the motor
drive current, thereby preventing damage to
the motor.
When
the limiter function is activated,
the pick-up motor cannot rotate as con-
trolled, possibly leading to pick-up faults.
Any pick-up fault causes the ADF controller
to flash the JAM indicator on the copier and
stop the pick-up motor at the same time.
Table 3-702
ADF controller PCB
+24V
Q5
Motor
driver
Figure 3-720
COPYRIGHT © 1995 CANONINC.
CANON NP6O12/NPGO12F /NP6212 AEV.1 SEPT, 1995 PRINTEDIN JAPAN (IMPRIME AU JAPON)
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