Description Of Components - Kenwood TK-272G Service Manual

TK-272G
DISPLAY UNIT (X54-3250-10)
Ref. No. Use/Function
IC501 IC
Q501 Transistor
Q502 Transistor
D505 Diode
D506 LED
D507 Diode
D508~510 LED
D511 LED
D512~516 LED
TX-RX UNIT (X57-587X-XX)
Ref. No. Use/Function
IC1 IC RF Power Module
IC2 IC PLL system
IC3 IC Comparator (APC)
IC4 IC FM IF system
IC5,6 IC
IC7 IC Voltage regulator
IC8 IC Voltage detector
IC9 IC Voltage detector
IC10 IC EEPROM
IC11 IC AF Power amplifier
IC12 IC Flash memory
IC13 IC Microprocessor
IC14 IC Audio processor
IC15(1/2) IC 2Tone amplifier
IC15(2/2) IC AF Pre amplifier
IC16(1/2) IC Bias buffer
IC16(2/2) IC AF Buffer amplifier
IC17 IC D/A converter (TX AF adjustment)
IC18 IC DTMF decoder
IC19 IC Active filter
IC301 IC VCO 1/2 divider
Q1 Transistor
Q2 Transistor
Q3 Transistor
Q4 Transistor
Q6 Transistor
Q7 FET DC switch
Q8,Q9 Transistor
Q10 FET
Q11 Transistor
Q12 Transistor
Q13 Transistor
Q14 Transistor
Q15 Transistor
Q16 Transistor
Q17 Transistor
Q18 Transistor
Q19 FET Mixer
Q20,Q21 Transistor DC switch
Q22 Transistor
22

DESCRIPTION OF COMPONENTS

Operation/Condition
LCD driver
Current driver / LCD back light LED AVR
DC switch
Speed up
LCD back light
Voltage reference
LED /Key pad back light
LCD back light
LED /Key pad back light
Operation/Condition
Shift register / Output expander
/ 5V
/ Reset
/ INT
/ For LSD in
PLL IC fin amplifier
VCO oscillation (TX)
RF Buffer amplifier
RF amplifier
RF amplifier / TX driver
DC switch
VCO oscillation (RX)
Ripple filter
Tripler
DC switch
2 nd IF W/N switch sets to on when Narrow
DC switch
DC switch / 5R
2 nd IF W/N switch sets to on when Wide
DC switch / 5T, Save
/ 5T, Save
IF amplifier
Ref. No. Use/Function
Q23 Transistor DC switch
Q24 Transistor DC switch
Q25 Transistor DC Switch
Q26 Transistor DC switch
Q27 FET DC switch
Q28 Transistor DC switch
Q30 FET SP Mute switch
Q31 Transistor Clock frequency shift
Q32~34 Transistor DC switch
Q35(1/2) FET Mute switch
Q35(2/2) FET DC switch
Q36 FET Mute switch
Q301 FET RF amplifier
D1 Diode Unlock detect
Variable
D2 Frequency control
capacitance diode
D3 Diode ANT switch
Variable
D4 Frequency control
capacitance diode
D5 Diode TX/RX switch
Variable
D6 TX modulation
capacitance diode
D7 Diode ANT switch
D8 Zener Diode Overload protection
Variable
D9 Frequency control
capacitance diode
D10 Diode ANT switch
Variable
D11 Frequency control
capacitance diode
D12 Diode Current steering
D13,14 Diode RF switch (2
D15 Diode Reverse protection
D17 Diode Model check
D18 LED LED/ Red, Green
D19 Diode Model check
D21 Diode Voltage drop
D22 Diode Reverse protection
D23 Diode Voltage clamp
Variable
D302,303,305 Rf BPF turnig
capacitance diode
Operation/Condition
/ W/N audio amplitude adjust
/ LED (Red)
/ LED (Green)
/ Squelch
/ 5T, Save
/ 5M
/ SP Mute
/ MIC line mute
nd
IF wide/narrow)