Components Description; Terminal Function - Kenwood UBZ-LJ8 Service Manual

COMPONENTS DESCRIPTION / TERMINAL FUNCTION
TX-RX Unit (X57-6672-70) (A/2) : Control
Ref. No. Use/Function
Q200 MIC Mute Switch
Q201 VOX Amplifier
Q210 3T Switch
Q211 3MS Switch
Q212 3R Switch
Q213 Lamp LED switch
Q215 3C Switch
Q216 AF Amplifier AVR
Q217~219 AF Switch
Q220 AF Switch
IC202 Voltage Detection
IC203 AF Amplifier
IC204 MIC Amplifier
IC206 Voltage Detection
IC207 AVR
IC208 MPU
IC209 Baseband IC
IC210 EEPROM
IC211 Low Pass Filter
D200 Protection Diode
D202 MIC Mute Diode
D203 Tone Signal Detection
D204 Tone Signal Detection
D205 Lamp LED
D206 Protection Diode
D208 Tone Signal Detection
D209,210 Voltage Level Shift Diode
TX-RX Unit (X57-6672-70) (B/2) : RF
Ref. No. Use/Function
Q1 Switch
Q2 Oscillator
Q3 Ripple Filter
Q4,5 Buffer
Q6 RF Amplifier
Q7 RF Amplifier
Q8 RF Power Amplifier
Q9 RF Amplifier
Operation/Condition/Compatibility
On when microphone mute
3T (3.0V)
3MS (3.0V)
3R (3.0V)
On when lamp LED on
3C (3.0V)
Acts as a voltage regulator
Internal/external speaker switch
Acts as a voltage regulator
2.4V, MPU reset
2 pin : Input, 5 pin : Output 1,
8 pin : Output 2
3 pin : Input, 4 pin : Output
3.0V, MPU reset
3M (3.0V)
Audio signal processing
Operating data storage
CTCSS low pass filter
Acts as an OR gate
Rectification
Rectification
LCD back light illumination
Rectification
Acts as a zener diode
Operation/Condition/Compatibility
Off when RX
RX : 424.30625~424.39375MHz
TX : 446.00625~446.09375MHz
For RX/TX
For TX
Transmit power
For RX
Ref. No. Use/Function
Q10 1st Mixer
Q11 IF Amplifier
Q13 Noise Amplifier
Q14 RF Amplifier
IC1 PLL IC
IC2 FM IC
D1 RF Switch
D2 Variable Capacitance
Diode
D3 Variable Capacitance
Switch
D4 Speed Up
D5 Diode
D8,10 RF Switch
D11 Rectifier

TERMINAL FUNCTION

■ CN1 and CN200
Pin No. Pin Name
1 GND Ground
2 MOD Voice modulation line
3 GND Ground
4 TO QT tone modulation line
5 GND Ground
6 BUSY RX busy detect
7 GND Ground
8 3C 3V power supply for VCO and PLL
9 GND Ground
10 UL PLL unlock
11 3T 3V power supply for TX
12 CK Clock line for PLL IC
13 3R 3V power supply for RX
14 DT Data line for PLL IC
15 B Battery voltage
16 EP Enable line for PLL
17 B Battery voltage
18 CRS RX carrier level detect
19 B Battery voltage
20 AFO RX audio output line
UBZ-LJ8
Operation/Condition/Compatibility
RX Frequency –
1st local oscillation frequency
1st IF 21.7MHz
For TX
TX/RX switch
VCO frequency control
VCO modulation
For ripple filter
Unlock detect
Antenna switch
Convert noise to DC voltage
Function
L : Unlock
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