Schematic diagram : tx-rx unit (x57-674x-xx), Th-k2at/k2e/k2et, Schematic diagram – Kenwood 144MHz FM TRANSCEIVER K2E User Manual

Page 52

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50

TH-K2AT/K2E/K2ET

SCHEMATIC DIAGRAM

A

B

C

D

E

1

2

3

4

5

6

7

X57-674 1/5

-t

5MS

5R

F1

2.5A

J2

L50

D32

RB051L-40

R210

12

D31

DA221

R226

220

D40

B30-2156-05

D41

B30-2157-05

R227

100

R190

47k

C236

0.01u

C235

0.01u

R191

47k

2SB1184(Q,R)

Q37

D34

MAZS0270H

C246

100u10

R217

820

R167

180k

C212

0.012u

R165

820k

C211

2200p

R144

0

C228

0.1u

C207

0.01u

C220

4700p

C221

0.01u

R192

470

2SC4617(R)

Q30

R156

100k

C201

1200p

D24

MA742

C219

0.047u

2SK1830

Q27

2SC4919

Q29

C230

1u

R185

270k

R181

470

R147

470

R137

4.7k

R180

39k

R179

220k

R148

150k

C209

1000p

R151

680

R197

100

R152

150k

R173

15k

R182

1k

C226

0.1u

R161

1k

C206

0.015u

R195

100

C229

0.1u

R174

560k

R140

180k

C195

10u10

R141

18k

C196

6800p

C197

6800p

R146

18k

R207

1k

R145

4.7k

CN2
1

2

IC6

TA7368F

1

2

3

4

5

6

NF

7

PHASE

8

PRE-GND

9

PW-GND

10

POUT

C255

10u10

R206

15

C253

10u10

C252

100p

L49

R205

100

C249

1000p

D26

1SS388

C248

0.1u

2SK1830

Q31

C247

0.1u

R203

470k

D25

MA2S111

R204

180k

R202

47k

R199

1k

R160

4.7k

C205

0.047u

R178

0

C225

1u

IC5

NJM2107F

1

2

3

4

5

V+

C202

270p

R155

100k

R153

1k

R168

180k

C203

120p

R157

330k

R158

330k

C204

0.033u

R159

120k

CN1

1

2

3

4

5

6

C210

0.01u

R166

820k

C213

4.7u6.3

C256

1000p

C257

1000p

C258

0.1u

R209

100k

R208

10

F3

0.5A

C198

1u

C250

1u

C240

1000p

C270
1000p

C271

1000p

C279

1000p

C280

1000p

R257

*

R258

*

R259

*

R260

47k

R261

*

C238

1000p

C241

1000p

R201

4.7k

C242

0.01u

C237

10u10

R193

1.8k

R224

18k

R223

220k

C239

1000p

2SB1184(Q,R)

Q33

2SK1830

Q34

R211

470k

D33

RB051L-40

C276

1000p

2SJ347

Q36

R272

4.7k

C272

470p

C290

1000p

C291

1000p

C320

*

C321

*

R177

10k

R212

10k

R214

10k

R162

180k

R163

560k

R196

10k

R216

10k

R200

10k

R194

10k

R213

22k

IC17

NJM2902V

1

2

3

4

V+

5

6

7

8

9

10

11

GND

12

13

14

CPH3417

Q56

C331

1000p

R215

470k

R273

1k

2SC4617(R)

Q38

Q47

RN1701

C208

82p

IC16

NJM2904V

1

2

3

4

GND

5

6

7

8

V+

C338

1u

J3

MIC

J4

SP

R324

47k

C339

0.047u

R330

470

C193

4.7u6.3

R332

15

C349

0.1u

C350

*

C351

0.01u

C352

1000p

C353

1000p

R335

1k

D27

RB706F-40

TH3

100k

D30

RB521S-30

2SK1830

Q35

R171

56k

(D)

R170

47k

(D)

D22

1SS361

C358

0.047u

VR5
50k

VR6

100k

R142

4.7k

R149

47k

R143

470

C231

1000p

C223

1000p

C224

0.1u

R176

820k

R175

2.2k

C222

0.01u

D36

RB521S-30

D35

RB521S-30

C286

1u

C283

1000p

C282

1000p

C285

1000p

C284

1000p

C281

1000p

IC4

XC6202PB52FR

1

2

4

GND

3

R264

*

Q59

*

R344

*

C511

*

C512

*

C517

*

R349

0

D74
DA221

D79
DA221

C505

0.047u

R354

0

D80

RB521S-30

C506

1000p

C232

1000p

C218

1000p

R218

0

R198

10k

R164

10k(D)

CHARGE SW

DC IN

TX LED

BUSY LED

SP MUTE SW

DCS BAL

SPG

AFO

SPK

REM/TXD

IM

MAX DEV

DTMF/1750

MIC

PTT

T0

SP

MOD

VOLOUT

MIC
MUTE
SW

WX1050Hz

5MV

5MV

VOX
DETECTION AMP

DTMF/BEEP/1750/W-ALT

AF AMP/
LAMP AVR

8V

5C/5R/5T AVR

5MS

RXD

REM

TXD

PTTE

BTEMP
CHARGE

VO

LIN

8 OHM

SPG

SPK

BATTERY
TERMINAL

5MS

11.5V AVR

RXD

PTTE

IM

TXD
SPM

MIG

ENCA

ENCB

5MS

IM

VO

L

O

UT

MIG

MICM

NAR

W/N

TX-RX UNIT (X57-674X-XX)(A/3)

5C/5R/5T AVR

HPF

AF AMP

MIC AMP

CTCSS/DCS/WX FILTER

REM

DTMF/BEEP

WIDE/NARROW
CHANGEOVER SW

Q56 OPERATION SW

Q31

CONSTANT-
CURRENT
CIRCUIT

Q33 OPERATION SW

NI-MH
TEMPERATURE
DETECTION

DC IN
DETECTION

REVERSE
CURRENT
PREVENTION

D33,35,36

Q36

AVR
CONSTANT-
VOLTAGE

Q37 OPERATION SW

Q38

Q37

TX/BUSY
LED SW

WX DETECTION AMP

MIC MUTE
CONTROL

MIC ALC
RECTIFICATION

D27

D24

VOX DETECTION
RECTIFICATION

SP MUTE
SPEED UP

C246 DISCHARGE

D26

REVERSE CURRENT
PREVENTION

REVERSE CURRENT
PREVENTION

LIMITER

D74,79

REVERSE CURRENT
PREVENTION

D80

5T

VO

U

T

VSS

VIN

1

VCC

VIN

RIPPLE

VOLIN

ENCA

NAR

ENCB

MOD

TO

5MS

QT/DQT

ENCB

ENCA

QT/DQT

5R

5T

5MS

5C

MOD

TO

NAR

VOLIN

VOXIN

SIGIN

TONE

REM

5MV

RXLED

NOAA

MICM

+B

5M

AFAMP

CHARGE

BTEMP

BTDET

DCDET

+B

RXD

SPM

TXD

IM

PTTE

MIG

8V

ROTARY
ENCODER

&

VOL KNOB

VOLOUT

VOLIN

ENCB

GND

ENCA

GND

R169

100k(D)

R186

68k

-t

C227

2.2u4

R183

33k

TH4

100k

R353

33k

R172

10k

13.43V

13.8V

T:0V
R:4.89V

11.45V

7.07V

13.58V

4.80V

7.07V

3.23V

T:4.92V
R:0V

2.08V

T:73mV
R:3.39V

T:3.29V
R:110mV

T:4.96V
R:0V

4.31V

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