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TK-260G/(N)/270G/(N)
DISPLAY UNIT (X54-3250-10) (TK-270G Only)
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
24
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)
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