Panasonic KX-MB1500RUB / KX-MB1500RUD / KX-MB1500RUW / KX-MB1520RUB / KX-MB1520RUW / KX-MB1530RUB Service Manual ▷ View online
33
KX-MB1500RU/KX-MB1520RU/KX-MB1530RU
6.5.
Speaker Phone Section (KX-MB1520/KX-MB1530 ONLY)
6.5.1.
General
The general speaker phone operation is performed by IC203 which has a speaker phone circuit. The alarm tone, the key tone,
and the beep are output from Soc IC300.
and the beep are output from Soc IC300.
6.5.1.1.
Speaker Phone
1. Function
This is the function when you are not holding the handset and can hear the caller’s voice from the line.
2. Circuit Operation
(Signal Path)
Signals received from the telephone line are output through at the speaker via the following path.
Voice sended from MIC to telephone line.
Signals received from the telephone line are output through at the speaker via the following path.
Voice sended from MIC to telephone line.
3. Signal Path
Refer to Check Sheet for Signal Route of Speaker RX and Mic Tx (P.173).
6.5.1.2.
Monitor Circuit
1. Function
This circuit monitors various tones, such as (1) DTMF tone, (2) Alarm/Beep/Key tone/Bell.
2. Signal Path
a. DTMF MONITOR
(Speaker Operation)
Refer to Check Sheet for Signal Route of DTMF Monitor (Speaker) (P.173).
Refer to Check Sheet for Signal Route of DTMF Monitor (Speaker) (P.173).
b. ALARM/BEEP/KEY TONE/BELL
Refer to Check Sheet for Signal Route of Ringing/Alarm/Beep/Key tone (P.173).
6.5.1.3.
TAM Interface Section
1. Function
When TAM is connected to this unit, the unit receives documents for FAX calls or the external TAM records a voice message
automatically.
automatically.
2. Circuit Operation
The TAM INTERFACE circuit consists of Soc(IC300) to detect the other party CNG signal, and RLY100 to separate EXT.TAM.
a. CNG signal detection circuit
The CNG signal from the other party’s FAX is detected in Soc IC300
(Signal path)
Refer to Check Sheet for Signal Route of CNG/DTMF detection (P.173).
(Signal path)
Refer to Check Sheet for Signal Route of CNG/DTMF detection (P.173).
b. Remote receiving
This is the parallel-connected DTMF signal for the TEL or EXT.TEL mode between T and R. When the other party is a
FAX, the unit switches to FAX receiving.
(Signal Path)
Refer to Check Sheet for Signal Route of DTMF detection (ON-Hook) (P.173).
FAX, the unit switches to FAX receiving.
(Signal Path)
Refer to Check Sheet for Signal Route of DTMF detection (ON-Hook) (P.173).
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KX-MB1500RU/KX-MB1520RU/KX-MB1530RU
6.6.
CIS Control Section
The scanning block of this device consists of a control circuit and a CIS (contact image sensor), and AFE(Analog Front End) include
A/D Converter.
(KX-MB1500/KX-MB1520 ONLY)
A/D Converter.
(KX-MB1500/KX-MB1520 ONLY)
35
KX-MB1500RU/KX-MB1520RU/KX-MB1530RU
(KX-MB1530 ONLY)
When an original document is inserted and the start button pressed, pin A3 of IC300 goes to a low level and the transistor Q518
turns on.
This applies voltage to the CIS. The CIS is driven by each of the signals (CCDSH, CCDCLK, Resolution) output from IC300.
The original image illuminated by the LED to output an analog image signal.
The analog image signal is input to the AFE on VINP(20pin of IC503) and converted into 16-bit data by the A/D converter inside
IC503. Then this signal undergoes digital processing in order to obtain a high-quality image.
Resolution
The CIS can change the resolution, 300 dpi mode or 600 dpi mode. If RESOLUTION signal is High level, CIS operates 600 dpi
mode.
The other case is 300 dpi mode.
turns on.
This applies voltage to the CIS. The CIS is driven by each of the signals (CCDSH, CCDCLK, Resolution) output from IC300.
The original image illuminated by the LED to output an analog image signal.
The analog image signal is input to the AFE on VINP(20pin of IC503) and converted into 16-bit data by the A/D converter inside
IC503. Then this signal undergoes digital processing in order to obtain a high-quality image.
Resolution
The CIS can change the resolution, 300 dpi mode or 600 dpi mode. If RESOLUTION signal is High level, CIS operates 600 dpi
mode.
The other case is 300 dpi mode.
Operation
CIS Resolution
300dpi
600dpi
COPY
Photo/Text, Text
Photo
PC SCAN
~300 X 300
400 X 400~
FAX (KX-MB1520
ONLY)
-
ALL
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KX-MB1500RU/KX-MB1520RU/KX-MB1530RU
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.
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.
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.
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.
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
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