Kenwood TK-260G Description Of Components, DISPLAY UNIT X54-3250-10 TK-270GOnly, Tx-Rxunit

Models: TK-270G

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TK-260G/270G

DESCRIPTION OF COMPONENTS

DISPLAY UNIT (X54-3250-10) (TK-270G Only)

Ref. No.

Use/Function

Operation/Condition

 

 

 

 

IC501

IC

LCD driver

 

 

 

 

 

Q501

Transistor

Current driver

/ LCD back light LED AVR

 

 

 

 

Q502

Transistor

DC switch

 

 

 

 

 

D505

Diode

Speed up

 

 

 

 

 

D506

LED

LCD back light

 

 

 

 

D507

Diode

Voltage reference

 

 

 

 

D508~510

LED

LED

/Key pad back light

 

 

 

 

D511

LED

LCD back light

 

 

 

 

 

D512~516

LED

LED

/Key pad back light

 

 

 

 

TX-RX UNIT (X57-587X-XX)

Ref. No.

Use/Function

Operation/Condition

 

 

 

 

IC1

IC

RF Power Module

 

 

 

 

 

IC2

IC

PLL system

 

 

 

 

 

IC3

IC

Comparator (APC)

 

 

 

 

 

IC4

IC

FM IF system

 

 

 

 

 

IC5,6

IC

Shift register

/ Output expander

 

 

 

 

IC7

IC

Voltage regulator

/ 5V

 

 

 

 

IC8

IC

Voltage detector

/ Reset

 

 

 

 

IC9

IC

Voltage detector

/ INT

 

 

 

 

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

/ For LSD in

 

 

 

 

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

/ TX driver

 

 

 

 

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

2nd IF W/N switch sets to on when Narrow

Q15

Transistor

DC switch

 

 

 

 

 

Q16

Transistor

DC switch

/ 5R

 

 

 

Q17

Transistor

2nd IF W/N switch sets to on when Wide

Q18

Transistor

DC switch

/ 5T, Save

 

 

 

 

Q19

FET

Mixer

 

 

 

 

 

Q20,Q21

Transistor

DC switch

/ 5T, Save

 

 

 

 

Q22

Transistor

IF amplifier

 

Ref. No.

Use/Function

Operation/Condition

 

 

 

 

Q23

Transistor

DC switch

/ W/N audio amplitude adjust

 

 

 

 

Q24

Transistor

DC switch

/ LED (Red)

 

 

 

 

Q25

Transistor

DC Switch

/ LED (Green)

 

 

 

 

Q26

Transistor

DC switch

/ Squelch

 

 

 

 

Q27

FET

DC switch

/ 5T, Save

 

 

 

 

Q28

Transistor

DC switch

/ 5M

 

 

 

 

Q30

FET

SP Mute switch

 

 

 

 

Q31

Transistor

Clock frequency shift

 

 

 

 

Q32~34

Transistor

DC switch

/ SP Mute

 

 

 

 

Q35(1/2)

FET

Mute switch

/ MIC line mute

 

 

 

 

Q35(2/2)

FET

DC switch

 

 

 

 

 

Q36

FET

Mute switch

 

 

 

 

 

Q301

FET

RF amplifier

 

 

 

 

 

D1

Diode

Unlock detect

 

 

 

 

 

D2

Variable

Frequency control

capacitance diode

D3

Diode

ANT switch

 

 

 

 

 

D4

Variable

Frequency control

capacitance diode

D5

Diode

TX/RX switch

 

 

 

 

 

D6

Variable

TX modulation

 

capacitance diode

 

D7

Diode

ANT switch

 

 

 

 

D8

Zener Diode

Overload protection

 

 

 

 

D9

Variable

Frequency control

capacitance diode

D10

Diode

ANT switch

 

 

 

 

 

D11

Variable

Frequency control

capacitance diode

D12

Diode

Current steering

 

 

 

 

D13,14

Diode

RF switch (2nd IF wide/narrow)

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

 

 

 

 

 

D302,303,305

Variable

Rf BPF turnig

 

capacitance diode

 

 

 

 

 

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Page 23
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Kenwood service manual Description Of Components, DISPLAY UNIT X54-3250-10 TK-270GOnly, Tx-Rxunit, TK-260G/270G