TK-2317
18
TX-RX unit (X57-7880-21)
Ref. No.
Use / Function
Operation / Condition
IC1
PLL IC
TX/RX 1st local
IC2
OP amplifi er
CVIN/CVADJ amplifi er
IC3
OP amplifi er
APC control
IC301
OP amplifi er
CVIN/CVADJ amplifi er
IC401
FM IC
RX FM system
IC402
Comparator
Narrow fi lter switching
IC801
5V AVR
50M
IC802
5V AVR
50C
IC803
5V AVR
50V
IC804
3.3V AVR
33M
IC805
Reset IC
Low battery level detector
IC806
3.3V AVR
33B
IC807
Reset IC
MCU reset signal
IC808
OP amplifi er
HSD amplifi er
IC810
EEPROM
EEPROM
IC811
OP amplifi er
RX BPF tuning
IC812
Baseband IC
Audio processor
IC815
AF amplifi er
Audio power amplifi er
IC817
OP amplifi er
VOX signal amplifi er
IC820
MCU
Microcontroller unit
IC821
LCD driver
Q2
RF buffer
PLL-IC input
Q3
Ripple fi lter
TX/RX VCO
Q4
Oscillator
RX VCO
Q5
Oscillator
TX VCO
Q6
DC switching
TX VCO switching
Q7
DC switching
RX VCO switching
Q8
RF buffer
VCO output
Q9
RF amplifi er
VCO output
Q11,12
DC switching
Assist switching
Q201
RF amplifi er
TX amplifi er
Q203
RF amplifi er
Pri-drive amplifi er
Q204
FET amplifi er
Drive amplifi er
Q205
FET amplifi er
Final power amplifi er
Q301~306
DC switching
TX FET bias
Q401
DC switching
Q404 control
Q403
Tripler
2nd local (16.8MHz x 3)
Q404
DC switching
FM-DET level switching
Q405
IF amplifi er
1st IF (49.95MHz)
Q406
Mixer
1st mixer
Q407
RF amplifi er
RX (VHF)
Q801
DC switching
Blue LED
Q802
DC switching
50T from 50M
Q803
DC switching
50R from 50M
COMPONENTS DESCRIPTION
Ref. No.
Use / Function
Operation / Condition
Q804
DC switching
33MS from 33M
Q805
DC switching
Green/Red LED
Q806
DC switching
MCU clock shift circuit
Q809
DC switching
MIC mute
Q810,811
Amplifi er
AGC control
Q813
DC switching
Q814 control
Q814
DC switching
AF power mute
Q815
Level converter
EXT PTT/RXD
Q816
Level converter
EXT TXD
Q817
DC switching
Pop noise mute
Q818,819
AF switching
AF power mute
Q820
DC switching
Q821 control
Q821
DC switching
Backlight LED
Q822
DC switching
EMG PTT
D4,6,8,9
Varicap
TX VCO tune
D10,12
Varicap
RX VCO tune
D13
Speed up
Ripple fi lter
D14
Varicap
TX VCO assist tune
D15
Varicap
RX VCO assist tune
D16
Varicap
Modulation
D17,18
Switching
TX-f/RX 1st local
D201~204
Switching
TX/RX ANT switching
D301
5.1V zone
Over voltage prevention
D401,402
Switching
Narrow fi lter on/through
D404,405
Varicap
RX RF BPT tune
D407,408
Varicap
RX RF BPT tune
D801
LED (green)
Busy
D803
Protection
Power supply
D804
LED (blue)
Signal
D805
LED (red)
TX
D806
5.1V zener
Over voltage prevention
D807,808
Detection
MIC level
D809,810
Detection
VOX level
D817
Speed up
LCD back light
D818~821
LED (yellow)
Backlight
D824
LED (yellow)
Backlight
D829
Key input detect
Key1I input
D830
Key input detect
Key2I input
D831
Key input detect
Key3I input
D832
Key input detect
Key4I input