Components Description - Kenwood TK-3312 Service Manual

TK-3312/3317
TX-RX unit (X57-7890-21)
Ref. No. Use / Function
IC1 PLL IC
OP amplifier
IC2,301
IC401 FM IC
IC402 Comparator
IC801 5V AVR
IC802 5V AVR
IC803 5V AVR
IC804 3.3V AVR
IC805 Reset IC
IC806 3.3V AVR
IC807 Reset IC
OP amplifier
IC808
EEPROM
IC810
OP amplifier
IC811
IC812 Baseband IC
IC815 AF amplifier
OP amplifier
IC817
IC820 MCU
IC821 LCD driver
Q2 RF buffer
Q3 Ripple filter
Oscillator
Q4
Oscillator
Q5
Q6 DC switching
Q7 DC switching
Q8 RF buffer
Q9 RF amplifier
Q11,12 DC switching
Q201 RF amplifier
Q203 RF amplifier
Q204 FET amplifier
Q205 FET amplifier
Q301 DC switching
Q303~306 DC switching
Q401 DC switching
Q403 Tripler
Q404 DC switching
Q405 IF amplifier
Q406 Mixer
Q407 RF amplifier
Q801 DC switching
Q802 DC Switching
Q803 DC Switching
Q804 DC Switching
18

COMPONENTS DESCRIPTION

Operation / Condition
TX/RX 1st local
CVIN/CVADJ amplifier
RX FM system
Narrow filter switching
50M
50C
50V
33M
Low battery lebel detector
33B
MCU reset signal
HSD amplifier
EEPROM
RX BPF tuning
Audio processor
Audio power amplifier
VOX signal amplifier
Microcontroller unit
PLL-IC input
TX/RX VCO
RX VCO
TX VCO
TX VCO switching
RX VCO switching
VCO output
VCO output
Assist switching
TX amplifier
Pri-drive amplifier
Drive amplifier
Final power amplifier
TX FET bias
APC circuit
Q404 control
2nd local (16.8MHz x 3)
FM-DET level switching
1st IF (49.95MHz)
1st mixer
RX (VHF)
Blue LED
50T from 50M
50R from 50M
33MS from 33M
Ref. No. Use / Function
Q805 DC switching
Q807 DC switching
Q809 DC switching
Q810,811 Amplifier
Q813 DC switching
Q814 DC switching
Q815 Level converter
Q816 Level converter
Q817 DC switching
Q818,819 AF switching
Q820 DC switching
Q821 DC switching
Q822 DC switching
D6,9 VARICAP
D10,12 VARICAP
D13 Speed up
D14 VARICAP
D15 VARICAP
D16 VARICAP
D17,18 Switching
D201~204 Switching
D301 5.1V Zone
D401,402 Switching
D403~405 VARICAP
D407,408 VARICAP
D801 LED (green)
D803 Protection
D804 LED (blue)
D805 LED (red)
D806 5.1V Zener
D807,808 Detection
D809,810 Detection
D817 Speed up
D818~821 LED (yellow)
D824 LED (yellow)
D829 Key input detect
D830 Key input detect
D831 Key input detect
D832 Key input detect
Operation / Condition
Green/Red LED
MCU clock shift circuit
MIC mute
AGC control
Q814 control
AF power mute
EXT PTT/RXD
EXT TXD
Pop noise mute
AF power mute
Q821 control
Backlight LED
EMG PTT
TX VCO tune
RX VCO tune
Ripple filter
TX VCO assist tune
RX VCO assist tune
Modulation
TX-f/RX 1st local
TX/RX ANT switching
Over voltage prevention
Narrow filter on/through
RX RF BPT tune
RX RF BPT tune
Busy
Power supply
Signal
TX
Over voltage prevention
MIC level
VOX level
LCD back light
Backlight
Backlight
Key1I input
Key2I input
Key3I input
Key4I input