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KX-MB1520FX7/KX-MB1520FX8/KX-MB1520FXW/KX-MB1530FX7/KX-MB1530FXW
6.7.
Motor Drive Section
6.7.1.
Engine Motor Control Circuit
1.
Functions
All driving forces of printer engine part are supplied by tis engine motor.
Engine motor is controlled so as to rotate at constant speed during printing and copying.
2.
Block Diagram of Main motor Drive circuit
Main motor drive circuit consists of motor driver IC and Current control circuit.
3.
Explanation of each circuit
1. Motor driver
IC600 is the constant current, Bi-polar stepping motor drive IC.
This IC can drive up to 2A/phase and support up to 2W1-2 phase excitation.
When "enable" signal (IC600_pin2) becomes "L", motor driver is activated, and motor current are supplied from
IC600_pin1, pin18, pin21 and pin22 to drive the motor coil.
Excitation type is selected by the logic level of "MS1"(IC600_pin8) and "MS2"(IC600_pin9).
The operation of IC600 is shown in below table corresponding to each logic level of enable, MS1, and MS2.
After setting the above signals, clock signal is supplied from IC300_pinA12 to IC600_pin14.
Whenever clock signal is supplied, current value and direction supplied to Main motor change according to the
excitation type which is determined by above signal levels.
The clock frequency also determines the motor speed.
2. Motor current control circuit
According to the rotation speed, motor current is controlled for appropriate value.
In order to control the motor current, Ref voltage of IC600 is controlled.
When Ref voltage is high, motor current is increased, and the voltage is low, motor current is decreased.
For the control of Ref voltage, PWM pulse is supplied from IC300_pinB8.
PWM pulse is integrated by R615 and C610.
Consequently PWM pulse is converted to DC voltage.
When duty of PWM pulse is high, Ref voltage is increased and when duty is low, Ref voltage is decreased.
Enable
(IC600_pin2)
MS1
(IC600_pin8)
MS2
(IC600_pin9)
Excitation type
Motor Operation
H
-
-
Disable
Motor stop
L
L
L
2 Phase Excitation
Full speed operation
L
H
L
F1-2 Excitation
Half speed operation
L
L
H
W1-2 Excitation
Not used
L
H
H
2W1-2 Excitation
Not used
Summary of Contents for KX-MB1520FX7
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