Panasonic KX-MB2110RUW / KX-MB2130RUW / KX-MB2170RUW / KX-MB2117RUB / KX-MB2137RUB / KX-MB2177RUB Service Manual ▷ View online
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KX-MB2110RUW/ KX-MB2130RUW/ KX-MB2170RUW/ KX-MB2117RUB/ KX-MB2137RUB/ KX-MB2177RUB
6.9.3.2.
Full Speed Mode
In full speed mode, IC300_pinK25 outputs constant 3.3V.
When Q603 is turned on, Vo becomes approx 20V (approx.4V drops between R616).
So the voltage between R624 is determined as follows
When Q603 is turned on, Vo becomes approx 20V (approx.4V drops between R616).
So the voltage between R624 is determined as follows
VL=Vo*R624/(R623+R624)=20*22K/(150K+22K)=2.5(V)
Since IC504_pin2 is 3.3V and IC504_pin3 is 2.5V, pin1_IC504 is always "L".
Consequently Q603 is always turned on, and then approx 20V is supplied to FAN motors.
Therefore FAN rotates with full speed.
Consequently Q603 is always turned on, and then approx 20V is supplied to FAN motors.
Therefore FAN rotates with full speed.
6.9.3.3.
FAN stop
When IC300_pinK25 is "L", Q603 is turned off, then both FAN stop rotation.
6.9.3.4.
Rotation detect signal
During the FAN rotation, the pulse signal is output from pin 2 of FAN motors as the rotation detects signals.
If the period of the pulse is wider than predetermined value, it is judged that FAN error occurred.
Then display shows "Call Service 4".
If the period of the pulse is wider than predetermined value, it is judged that FAN error occurred.
Then display shows "Call Service 4".
6.9.4.
Control table
FANON1
(IC300_pin
K25
)
FAN mode
H
Full speed
Pulse
Half speed
L
Stop
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KX-MB2110RUW/ KX-MB2130RUW/ KX-MB2170RUW/ KX-MB2117RUB/ KX-MB2137RUB/ KX-MB2177RUB
6.9.5.
Waveform
3.3V
3.3V
3.1V
0.6V
0.6V
24V
20V
30KHz
3.3V
1.2V
1.2V
0.6V
0.6V
12V
9.8V
(1)Full speed (H:20usec/Div)
Point D(1V/Div)
Point C(2V/Div)
Point B(2V/Div)
Point A(2V/Div)
Point F(5V/Div)
Point E(10V/Div)
Point D(1V/Div)
(2)Half speed (H:20usec/Div)
Point D(1V/Div)
Point C(2V/Div)
Point B(2V/Div)
Point A(2V/Div)
Point F(5V/Div)
Point E(10V/Div)
Point D(1V/Div)
Ground level
Ground level
Peak Level
Peak Level
Ground level
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KX-MB2110RUW/ KX-MB2130RUW/ KX-MB2170RUW/ KX-MB2117RUB/ KX-MB2137RUB/ KX-MB2177RUB
6.10. Solenoid Driver Section
The solenoid drive circuit controls Registration clutch, Pick up solenoid, ADU clutch, and Switch back solenoid.
These solenoids are designed to be driven 24V.
The diodes protect transistors from reverse generated voltage when solenoids are turned off.
These solenoids are designed to be driven 24V.
The diodes protect transistors from reverse generated voltage when solenoids are turned off.
1. Circuit Diagram
2. Active Logic
SWITCH BACK
MODE
IC300_P26
Solenoid ON
High level
Solenoid Hold
Pulse
Solenoid OFF
Low level
ADU
MODE
IC300_H23
Solenoid ON & Hold
High level
Solenoid OFF
Low level
RESIST
MODE
IC300_L26
Clutch ON & Hold
High level
Clutch OFF
Low level
PICK UP
MODE
IC300_L24
Solenoid ON & Hold
High level
Solenoid OFF
Low level
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KX-MB2110RUW/ KX-MB2130RUW/ KX-MB2170RUW/ KX-MB2117RUB/ KX-MB2137RUB/ KX-MB2177RUB
3. PWM control of SWICH BACK solenoid
When the duplex printing, SWICH BACK solenoid is repeated 2.4sec ON / 2.6sec OFF.
In order to prevent the solenoid becomes high temperature, thereby reducing solenoid current by PWM control.
Until 100msec elapsed since the solenoid is turned on, to pull the plunger at full power.
Then, by turning on Q521 to 70% duty of PWM signal, and is reduced to 70% of the solenoid current.
In order to prevent the solenoid becomes high temperature, thereby reducing solenoid current by PWM control.
Until 100msec elapsed since the solenoid is turned on, to pull the plunger at full power.
Then, by turning on Q521 to 70% duty of PWM signal, and is reduced to 70% of the solenoid current.
solenoid current
(Point A)
100mA/div
10V/div
Q521 collector
(Ponit B)
100msec/div
100msec
solenoid current
(Point A)
100mA/div
10V/div
Q521 collector
(Ponit B)
2usec/div
PWM controll enlarged view
70% ON
30% OFF
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