TK-2312/2317
18
TX-RX unit (X57-7880-20)
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 lebel 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
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