UBZ-LJ8
7
TX-RX Unit (X57-6672-70) (A/2) : Control
Ref. No.
Use/Function
Operation/Condition/Compatibility
Q200
MIC Mute Switch
On when microphone mute
Q201
VOX Amplifier
Q210
3T Switch
3T (3.0V)
Q211
3MS Switch
3MS (3.0V)
Q212
3R Switch
3R (3.0V)
Q213
Lamp LED switch
On when lamp LED on
Q215
3C Switch
3C (3.0V)
Q216
AF Amplifier AVR
Acts as a voltage regulator
Q217~219
AF Switch
Internal/external speaker switch
Q220
AF Switch
Acts as a voltage regulator
IC202
Voltage Detection
2.4V, MPU reset
IC203
AF Amplifier
2 pin : Input, 5 pin : Output 1,
8 pin : Output 2
IC204
MIC Amplifier
3 pin : Input, 4 pin : Output
IC206
Voltage Detection
3.0V, MPU reset
IC207
AVR
3M (3.0V)
IC208
MPU
IC209
Baseband IC
Audio signal processing
IC210
EEPROM
Operating data storage
IC211
Low Pass Filter
CTCSS low pass filter
D200
Protection Diode
D202
MIC Mute Diode
Acts as an OR gate
D203
Tone Signal Detection
Rectification
D204
Tone Signal Detection
Rectification
D205
Lamp LED
LCD back light illumination
D206
Protection Diode
D208
Tone Signal Detection
Rectification
D209,210
Voltage Level Shift Diode
Acts as a zener diode
TX-RX Unit (X57-6672-70) (B/2) : RF
Ref. No.
Use/Function
Operation/Condition/Compatibility
Q1
Switch
Off when RX
Q2
Oscillator
RX : 424.30625~424.39375MHz
TX : 446.00625~446.09375MHz
Q3
Ripple Filter
Q4,5
Buffer
Q6
RF Amplifier
For RX/TX
Q7
RF Amplifier
For TX
Q8
RF Power Amplifier
Transmit power
Q9
RF Amplifier
For RX
Ref. No.
Use/Function
Operation/Condition/Compatibility
Q10
1st Mixer
RX Frequency –
1st local oscillation frequency
Q11
IF Amplifier
1st IF 21.7MHz
Q13
Noise Amplifier
Q14
RF Amplifier
For TX
IC1
PLL IC
IC2
FM IC
D1
RF Switch
TX/RX switch
D2
Variable Capacitance
VCO frequency control
Diode
D3
Variable Capacitance
VCO modulation
Switch
D4
Speed Up
For ripple filter
D5
Diode
Unlock detect
D8,10
RF Switch
Antenna switch
D11
Rectifier
Convert noise to DC voltage
COMPONENTS DESCRIPTION / TERMINAL FUNCTION
TERMINAL FUNCTION
■
CN1 and CN200
Pin No. Pin Name
Function
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
L : 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