Panasonic KX-MB3030RU / KX-FAP106A7 Service Manual ▷ View online
41
KX-MB3030RU
(2) Wave form
6.7.2.8.3.
W1-2 phase excitation (Quarter step)
ST1="H",ST2="H",ST3="L"
(1) Timing chart
(2) Wave form
42
KX-MB3030RU
6.7.2.8.4.
2W1-2 phase excitation (Octal step)
ST1="L",ST2="L",ST3="H"
(1) Timing chart
(2) Wave form
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KX-MB3030RU
6.7.2.9.
Drive mode of FB and ADF motor
6.7.2.9.1.
Correspondent table of operation
6.7.3.
Optional Lower input Tray Motor (OPF Motor) Drive circuit
6.7.3.1.
General
This MFP can add Optional Lower input Tray for improving the performance.
OPF motor feed the paper in this tray to the registration roller.
OPF motor drive circuit is consist of motor drive IC (IC950), current control circuit, and over current protection circuit.
OPF motor feed the paper in this tray to the registration roller.
OPF motor drive circuit is consist of motor drive IC (IC950), current control circuit, and over current protection circuit.
6.7.3.2.
Circuit Diagram
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KX-MB3030RU
6.7.3.3.
Explanation of each circuit
6.7.3.3.1.
Motor driver IC
IC950 is the motor driver BD6396EFV.
This IC can drives up to 1.5A/phase and support 2 phase and 1-2 phase excitation.
During motor driving, IC300_pin AN25 becomes "H" then motor driver IC950 is activated.
Stepping pulses are output from IC300_pinAN30, AP31, AM30, and AL30. and motor current are supplied from IC950_pin 16,
18, 19 and 21 to drive the motor coil.
Rotation speed of this motor is 950pps/2 phase excitation at high speed printing mode, and 950pps/1-2 phase excitation at half
speed printing mode.
This IC can drives up to 1.5A/phase and support 2 phase and 1-2 phase excitation.
During motor driving, IC300_pin AN25 becomes "H" then motor driver IC950 is activated.
Stepping pulses are output from IC300_pinAN30, AP31, AM30, and AL30. and motor current are supplied from IC950_pin 16,
18, 19 and 21 to drive the motor coil.
Rotation speed of this motor is 950pps/2 phase excitation at high speed printing mode, and 950pps/1-2 phase excitation at half
speed printing mode.
6.7.3.3.2.
Motor current control circuit
6.7.3.3.3.
Circuit explanation
According to the print speed, motor current is controlled for appropriate value.
When print speed is low, motor has enough driving force. So to prevent the vibration and noise during motor rotation, motor
drive current should be reduced.
When print speed is high, motor needs much driving force. so much current should be supplied.
In order to control the motor current, Vref voltage of motor driver is controlled.
When Vref voltage is high, motor current is increased, and the voltage is low, motor current is reduced.
For the control of Vref voltage, PWM pulse is supplied from IC300_pinAN31.
PWM pulse is inverted by FET Q951 and integrated by R961, R962, and C953.
Thus PWM pulse is converted to DC voltage, and is supplied to Vref pin of motor driver IC950.
When duty of PWM pulse is high, Vref voltage is decreased and when duty is low, Vref voltage is increased.
In full speed printing mode, motor current is controlled approx. 1A, and in half speed mode, motor current is controlled approx.
0.8A.
When print speed is low, motor has enough driving force. So to prevent the vibration and noise during motor rotation, motor
drive current should be reduced.
When print speed is high, motor needs much driving force. so much current should be supplied.
In order to control the motor current, Vref voltage of motor driver is controlled.
When Vref voltage is high, motor current is increased, and the voltage is low, motor current is reduced.
For the control of Vref voltage, PWM pulse is supplied from IC300_pinAN31.
PWM pulse is inverted by FET Q951 and integrated by R961, R962, and C953.
Thus PWM pulse is converted to DC voltage, and is supplied to Vref pin of motor driver IC950.
When duty of PWM pulse is high, Vref voltage is decreased and when duty is low, Vref voltage is increased.
In full speed printing mode, motor current is controlled approx. 1A, and in half speed mode, motor current is controlled approx.
0.8A.
6.7.3.3.4.
Timing chart of current control
Following timing charts are the example of Vref voltage corresponding to PWM pulse duty.
6.7.3.3.5.
Over current protection circuit
By parts failure or other reason, if Vref voltage exceeds 0.8V, extreme current is supplied to the OPF motor and may cause
some damage to OPF motor.
To prevent this problem, Q952 and R963 are provided for over current protection.
If Vref voltage exceeds 0.8V, Q952 turns on. Then PS signal (IC950_pin8) becomes "L".
As the result, IC950 stops output the motor current.
some damage to OPF motor.
To prevent this problem, Q952 and R963 are provided for over current protection.
If Vref voltage exceeds 0.8V, Q952 turns on. Then PS signal (IC950_pin8) becomes "L".
As the result, IC950 stops output the motor current.
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