Canon NP6012F Service Manual page 117

Table 3-702
F. Controlling the Pick-Up
Motor
1. Outline
Figure 3-720 is a diagram of the control
circuit for the pick-up motor (M2).
The pick-up motor is a DC motor.
The CPU (Ql) on the ADF controller
PCB sends the motor drive signals PM0 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.
ADF controller PCB
t
+24V
Ql
PM1 d5
PMRDI
CPU
* Motor
_
driver
~
PM0
t
PMRDl*
Figure 3-720
Pick-up
motor
COPYRIGHT 0 1995 CANONINC.
CANON NP60121NP6012F/NP6212 REV.1 SEPT.1995 PRlNTEOINJAPAN(IMPRIM~AUJAPON)
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