Panasonic KX-MB2571RU Service Manual ▷ View online
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KX-MB2571RU
6.10. Solenoid Driver Section
The solenoid drive circuit controls Resist Clutch, Pick up solenoid, ADU solenoid, Switch back solenoid and MPT pick up solenoid.
When duplex scanning, this circuits controls ADF solenoid and ADF switch back solenoid.
These solenoids are designed to be driven 24V.
The diodes protect transistors from reverse generated voltage when solenoids are turned off.
When duplex scanning, this circuits controls ADF solenoid and ADF switch back solenoid.
These solenoids are designed to be driven 24V.
The diodes protect transistors from reverse generated voltage when solenoids are turned off.
1. Circuit Diagram
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KX-MB2571RU
2. Active Logic
ADU SWITCH BACK
MODE
IC300_B9
Solenoid ON
High level
Solenoid OFF
Low level
ADU
MODE
IC300_A9
Solenoid ON
High level
Solenoid OFF
Low level
RESIST
MODE
IC300_C10
Clutch ON
High level
Clutch OFF
Low level
ADF
MODE
IC300_L1
Solenoid ON
High level
Solenoid OFF
Low level
ADF SWITCH BACK
MODE
IC300_M2
Solenoid ON
High level
Solenoid OFF
Low level
STD PICK UP
MODE
IC300_B10
Solenoid ON
High level
Solenoid OFF
Low level
MPT PICK UP
MODE
IC300_D10
Solenoid ON
High level
Solenoid OFF
Low level
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KX-MB2571RU
6.11. Optional Lower input Tray Motor (OPF Motor) Drive and Solenoid Drive
circuit
6.11.1. General
This MFP can add Optional Lower input Tray for improving the performance.
OPF motor feed the paper in this tray to the Resist Roller.
OPF motor drive circuit is consist of motor drive IC (IC950), current control circuit.
OPF motor feed the paper in this tray to the Resist Roller.
OPF motor drive circuit is consist of motor drive IC (IC950), current control circuit.
6.11.2. Circuit Diagram
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KX-MB2571RU
1. Explanation of each circuit
1. Motor driver
IC950 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 (IC950_pin2) becomes "L", motor driver is activated, and motor current are supplied from
IC950_pin1, pin18, pin21 and pin22 to drive the motor coil.
Excitation type is selected by the logic level of "MS1"(IC950_pin8) and "MS2"(IC950_pin9).
MS2 of this circuit is fixed "Low" level.
The operation of IC950 is shown in below table corresponding to each logic level of enable, MS1, and MS2.
IC950 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 (IC950_pin2) becomes "L", motor driver is activated, and motor current are supplied from
IC950_pin1, pin18, pin21 and pin22 to drive the motor coil.
Excitation type is selected by the logic level of "MS1"(IC950_pin8) and "MS2"(IC950_pin9).
MS2 of this circuit is fixed "Low" level.
The operation of IC950 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_pin D5 to IC950_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.
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 IC950 is controlled.
When Ref voltage is high, motor current is increased, and the voltage is low, motor current is decreased.
According to the rotation speed, motor current is controlled for appropriate value.
In order to control the motor current, Ref voltage of IC950 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_pin A1.
PWM pulse is integrated by R958 and C959.
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.
PWM pulse is integrated by R958 and C959.
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.
3. Solenoid control circuit
The solenoid drive circuit controls Pick up solenoid.
These solenoids and clutch are designed to be driven 24V.
The diodes protect transistors from reverse generated voltage when solenoids are turned off.
The solenoid drive circuit controls Pick up solenoid.
These solenoids and clutch are designed to be driven 24V.
The diodes protect transistors from reverse generated voltage when solenoids are turned off.
2. Waveform of Motor current control circuit
Enable
(IC950_pin2)
MS1
(IC950_pin8)
MS1
(IC950_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
OPF PICKUP
MODE
IC300_B4
Solenoid ON
High level
Solenoid OFF
Low level
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