Description Of Components - Kenwood TK-260G Service Manual

DISPLAY UNIT (X54-3250-10) (TK-270G Only)
Ref. No. Use/Function
IC501 IC LCD driver
Q501 Transistor Current driver
Q502 Transistor DC switch
D505 Diode Speed up
D506 LED LCD back light
D507 Diode Voltage reference
D508~510 LED LED
D511 LED LCD back light
D512~516 LED 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 Shift register
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 PLL IC fin amplifier
Q2 Transistor VCO oscillation (TX)
Q3 Transistor RF Buffer amplifier
Q4 Transistor RF amplifier
Q6 Transistor RF amplifier
Q7 FET DC switch
Q8,Q9 Transistor DC switch
Q10 FET VCO oscillation (RX)
Q11 Transistor Ripple filter
Q12 Transistor Tripler
Q13 Transistor DC switch
Q14 Transistor 2 nd IF W/N switch sets to on when Narrow
Q15 Transistor DC switch
Q16 Transistor DC switch
Q17 Transistor 2 nd IF W/N switch sets to on when Wide
Q18 Transistor DC switch
Q19 FET Mixer
Q20,Q21 Transistor DC switch
Q22 Transistor IF amplifier

DESCRIPTION OF COMPONENTS

Operation/Condition
/ LCD back light LED AVR
/Key pad back light
/Key pad back light
Operation/Condition
/ Output expander
/ 5V
/ Reset
/ INT
/ For LSD in
/ TX driver
/ 5R
/ 5T, Save
/ 5T, Save
TK-260G/270G
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)
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