KENWOOD RXD-251, RXD-301, RXD-351, RXD-371S, RXD-A3 Service Manual

Y39 -2930 -11

RXD-251/301/351/371S/A3

A

1

2

3

4

5

6

7

B C D E F G I K M OH J L N

TUNER UNIT RXD-351(J,X1,Y1,M1), RXD-A3(K1,P1), RXD-251(X2,M3), RXD-371S(M2)

IC102

IC201

IC101

RXD-371S(M2) (1/5)

RXD-251(X2,M3) (1/5)

RXD-A3(K1,P1) (1/5)

RXD-351(J,X1,Y1,M1) (1/5)

+B

CANADA

U.S.A.

P1

K1

COUNTRY

DESTINATION

AUSTRALIA

GENERAL MARKET

JAPAN

PX

M1

X1

J

Y1

NO MTZ5.6B

ABB.

H,J

A,D,E,

D110

YES

F,I

B,C,

YES

G

NO

YES

D111,

112

C100A,147,

YES

221-223

2.2P

C110

470P

C116

0.015 1u50

C143 C171

0.1

C166,

NO

216,217

R115

22

1/2W

R130

150

3.3K

R134

NO

219

R150,

NO

R151

YES

R220

DESTINATION

COUNTRY

C143

1u50

D111,

YESNO MTZ5.6B YES

B,C,

ABB.

F,IG,H,J

A,D,E,

D110

112

0.022YES 2.2P 470P

C100A,147,

221-223

C110 C116

NONO 22 3.3K

150

1/2W

NO

R115 R134R130

219

R150,

YES

R220R151

COUNTRY

DESTINATION

R150,C100A,147,

A,D,E, B,C,

D111,

1u50

C143

YESNO

ABB.

G,H,J F,I

YESMTZ5.6B

D110

112

2.2PYES

221-223

C110

470P 0.015

C116

NO22

R115

NO3.3K

1/2W

R134

150

R130

219

YES

R220R151

AUSTRALIA X2

GENERAL MARKET M3

GENERAL MARKET

DESTINATION

COUNTRY

C143

3.3u50

D111,

NO

B,C,

M2

YES

ABB.

F,IG,H,J

A,D,E,

MTZ6.2B NO

D110

112

NO 4.7P

221-223

C100A,147,

C110

0.01510P

C116

YES27P0.022 47

214

C213,

C171 R115

100

10

1/2W

YES

R134R130

219

R150,

NO

R220R151

X3AUSTRALIA

C117

20P

C130,

131

24P

C213,

214

2.2K

R161

20P

C117

C130,

131

C166,

216,217

0.1

C171

24P

214

C213,

R161

2.2K

JUMPER

YES

JUMPER

YES

20P

C117

131

C130,

24PNO 0.1

C213,

214

216,217

C166,

C171

2.2K

R161

YES

JUMPER

C130,

131

C117

5.6P

C166,

YES

216,217

R161

4.7K

JUMPER

NO

NO

Q110,

111

Q110,

111

NO

111

NO

Q110,

Q110,

2SC2878A

111

DTC114YS

G

NO

YES

RXD-301/351

RXD-A3

RXD-251

RXD-371S

+B LINE

VCC

STEREO

IF

FM

GNDREG

DRIVE

TUNING

COMP

BUFF

FM

DET

IF

FM

AM

AM/

FM

SW

OSC

AM

LEVEL

DET

BUFF

ALC

AGC

AM/

S-CURVE

FM

IF

AM

DET

AM

AM

MIX RF.AGC

AM

MUTE

PHASE DET

VCO

PILOT

DET

STEREO

FF FF FF

DRIVE

TRIG

SW

DECODER

470
R119

3.3K
R120

20P

C124

1K

R211

4.7K

R210

100P

C209

100P
C210

C214 C213

20P
C117

470P

C116

10P
TC102

1

75 OHM

GND 2

3GND

(MW/SW)

4

L104

L105

CF104

CF103

T102

1

2

3 4

5

6

X201

7.2MHz

DI

CE

X IN

OUT0

SYC

DO

CL

IN1

IN0

OUT2

OUT1

OUT3

DIVIDER

SHIFT REGISTER LATCH

2

1

PROGRAMMABLE

12bit

1/16, 1/17 4bit

SWALLOW COUNTER

COUNTER

UNIVERSAL

CHARGE PUMP

PHASE DETECTOR

DIVIDER

REFERENCE

X OUT

VSS

PD2

FM IN

VDD

PD1

AM IN

OUT6

OUT5

LCTR

HCTR

OUT4

3

2

1

654

1

2

4

5

3

6

FM

C131

47mH

L107

C151

1500P

47mH

L108

C152

1500P

1u50
C129

+

2

1

TP1

CF105

1000P

0.01

C134

4.7K

1000P

4.7K

1000P

21

18

16

14

13

15

17

19

20

22

23

24

1

2

3

4

5

6

7

8

9

10

11

12

0.47u50

C137

+

3.3K

R122

3.3u50
C135

+

0.022

R134

8.2K
R123

0.022

0.047

10u50

+

R118

100

15P

2.2u50

C122

+

1u50

C123

+

C119

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

47u16

+

0.01

56P

C145

6.8K

C144

0.01

C143

+

2.2K

R133

L203

47uH

0.022
C153

R212

22u16

+

0.022
C160

100u16

C118

+

R138

4.7K

C217

0.022

R140

C147

0.022

100u16

C140

+

0.022
C139

1K

R131

100u16

C142

C141

0.022

+

3

2

4

Q107,108

1

3

2

4

6

5

100K

R114

100K

R113

0.1
C114

1000P

1K

R145

2

TP2

1

GND

VT

R104

100

CF101

6.8K
R107R106

1.5K

0.022

C107

R105

1K

R108

330

0.022
C108

CF102

ST IND

Lch

GND

Rch

DO

CLK

CE

+12V

2

1

4

DI3

568

7

9

MUTE10

543

2

5

12

3.6K

C133

R129

C132

R128

100P
C211

R146

1000P

R121

3.3K

1u50

+

1u50

+

15K
R149

C223

220P

C222

220P

C221

220P

R217

1K

R216

1K

R218

1K

C171

R161

10K

0.01
C150

0.1
C166

RFI N

BYPAS

MIX IN

AFC GND

GND

IF OUT

AFC

OSC

VCC

1

2

3

4

5

6

7

8

9

TC101 10P

0.022

C104

1K

R102

100K
R101

L102

T101

1

2

3

654

654

1

2

3

22

R103

18P

C105

33K

R110

C110

R111

1K

100K

R109

56P
C111

L103

0.1
C100A

100P

C112

2

3

1

4

5

L101

1000P

C101

100P

C155

R214

0.022
C106

R112

100

AM

FM

BAND

HF

LF

HF

LF

QUENCY

FRE-

7.3V

1.1V

7.0V

1.2V

VOLTAGE

VT

43

TC102

2

1

L104

5

10P

6

L201

3

2

4

1

5

C169

0.022

47mH
L106

0.01
C164

2.2M
R208

100K
R114

100K
R113

100K
R154

0.022
C165

0.022
C166

1K

1/4W

R153

3 4

2

1

L105

6

5

10

R157

20P
C117

47K
R156

2.2M
R155

470P

C167

C202

4700P

2.2M
R209

R158

4.7K

1/4W

3 4

L202

1

2

6

5

10

R204

4.7K

R162

C201

560P

R201

1K

TC201

10P

R100

4.7K

R202

4.7K 47mH

L204

4.7K

R205

4.7K
R203

0.022
C204

4.7K
R207

C170

0.01

4.7K
R160

47uH

L205

47u16
C205

+

A

B

JUMPER

10P

C116

470

R151

R150

2.2M

JUMPER

C128

C138

IF

GND

C130

6800P

C164

C165

6800P

C174

6800P

6800P

C175

C215

C162

C161

R126

3.3K

R127

3.3K

C157

100

1/4W

C121

1u50
C125

+

10K

C208

C207

R206

4.7

1/4W

R115

10K

R213

R130

1/4W

C126

C149

C127

10 1/4W

R219

R220

10 1/4W

220P
C220

0.022
C212

100P
C212

12

1000P

C102

R132

GND LINE

SIGNAL LINE

I

J

C216

0.022

AM

-CN101

AUDIO

4/5

+B

+5V

+5V

+B

+5V

+B

+B

+5V +5V

+B

+5V

+12V

+B

+B

+B

+B

+12V

+5V+5V +5V +5V

+12V

+B +B

+12V

+B

+B

+12V

+B

+12V

+12V

2.1V

(5.0V)

4.4V

2.4V

(3.6V)

4.5V

(5.0V)

3.4V

(1.4V)

3.3V

(0V)

2.1V

2.1V

TUNED: 0V

MONO: 4.7V

ST: 0V

4.3V
(5.0V)

(3.7V)

2.9V

2.1V

(1.1V)

2.1V

(1.9V)

1.5V

(1.1V)

2.7V

(0.6V)

2.0V

2.1V

1.3V

1.3V

0V

(2.5V)

0V

(0V)

2.3V

(5.5V)

0V

0V

0V

3.3V (0V)

4.1V

2.1V

2.0V

0V

0V

0V

OFF: 2.3V

MUTE

ON: 0V

OFF: 0V

MUTE

ON: 4.5V

MONO: 0V

ST: 3.2V

11.5V

11.5V

1.0V

5.0V

(5.6V)

5.0V

(5.5V)

1.3V

(0V)

5.0V

1.0V

0.6V

0.7V

2.4V

0.1V

0.7V

3.8V

4.1V

4.5V(5.0V)

ANTENNA

JK101

D101

D102

AM ANT

COIL

MW OSC

COIL

AM IFT

AM/FM

/MPX

SYSTEM

IC

PLL

IC102

IC201

Q101

Q105

Q106

Q107,108

Q109,115,116

D101,102,105,111,112,202

: 2SK161(GR)

: DTC114YS

: 2SC945(Q)

: LC7218

: DTA114YS

: 2SC1675(L)

: LA1831

: 1SS133

Q108

Q107

Q109

Q105

D202

D110

Q106

MUTE

CONTROL

L.P.F

AM RF

AMP

D108

D112

D111

Q101

IF

AMP

CN101

D106

FM RF

COIL

D105

(1/2)

FM IFT

FM OSC

IC101 : LA1186N

Q102

: 2SC1674(L)Q102

RF AMP

COIL

F

AM ANT

COIL

(2/2)

D106

D108 D108

(2/2) (1/2)

Q110

COIL

MW OSC

Q111

Q112

Q202

COIL

SW ANT

Q114

Q100

Q203

COIL

SW OSC

Q204

Q201

Q113

Q110 Q111

G

Q116 Q115

H

E

D

C

COIL

FM ANT

Q113,201

Q100,114

Q112,202-204

: DTA144ES

: 2SC2001(L)

: 2SC2878A

D110

D106

D108 : KV1581A

:

: KV1340A

:Q110,111

A

CAUTION: For continued safety, replace safety critical components only with manu-

facturer's recommended parts (refer to parts list). indicates safety critical compo-

nents. For continued protection against risk of fire, replace only with same type and

rating fuse(s). To reduc e the risk of electric shock, leakage-current or resistance

measurements shall be carried out (exposed parts are acceptably insulated from

the supply circuit) before the appliance is returned to the customer.

MODE CARRIER

MODULATION

ANT INPUT

FREQUENCY DEVIATION

FM 98MHz 1kHz STEREO 67.5kHz 7.5kHz(Pilot) 60dB

AM 1000(999)kHz 400Hz MONO 30% MOD 60dB

The DC voltage is an actual reading measured with a high impedance type volt-

meter as the AM/FM signal generator is specified to the conditions as shown in the

list below. The measurement value may vary depending on the measuring instru -

ments used or on the product. The val ue shown in ( ) is actual reading mea-

sured in the AM mode.

1

P R T V X Z AB ADQ S U W Y AA AC

3

5

7

2

4

6

Y39 -2930 -11

RXD-251/301/351/371S/A3

470

R119

3.3K
R120

20P

C124

1K

R211

4.7K

R210

100P

C209

100P
C210

24P
C214

24P
C213

1

75 OHM

GND 2

3GND

AM 4

CF104

CF103

T102

X201

7.2MHz

DI

CE
X IN

OUT0

SYC

DO
CL

IN1

IN0

OUT2

OUT1

OUT3

DIVIDER

SHIFT REGISTER LATCH

2

1

PROGRAMMABLE

12bit

1/16, 1/17 4bit

SWALLOW COUNTER

COUNTER

UNIVERSAL

CHARGE PUMP

PHASE DETECTOR

DIVIDER

REFERENCE

X OUT

VSS

PD2

FM IN

VDD

PD1

AM IN

OUT6

OUT5

LCTR

HCTR

OUT4

3

2

1

654

1

2

4

5

3

6

FM

0.015

1u50

+

47mH
L107

C111

1500P

0.015

1u50

+

47mH

L108

C112

1500P

3.3K

3.3K

1u50
C129

+

2

1

TP1

1

2

3

654

C152

1200P

R121

3.3K

CF105

180P

C138 0.01

C151

4.7K

1000P

4.7K

1000P

0.47u50

C137

+

3.3K

R122

3.3u50

C135

+

0.022

22uH

L110

10P
C156

3.3K
R134

R123

0.022

0.047

10u50

+

R118

100

C121 15P

2.2u50

C122

+

1u50

C123

+

1u50

+

C148

0.1

C103

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

47u16

+

0.01

56P
C145

R214 6.8K

C144

0.022

0.47u50

C143

+

3.3K

R133

L203

47uH

0.022
C153

10K

22u16

+

0.022
C160

100u16

C118

+

22

R137

10K

C212

100P

R140

150 1/2W

R130

C220

220P

10K

100u16
C140

+

0.022

C139

1K

R131

100u16

C142

C141

0.022

+

10K

C125

R115

3

2

4

Q107,108

OSC 3

5

678

2

1

4

0.1

0.1
C150

1K

R145

2

TP2

1

GND

VT

R104

220

CF101

L102

22uH

C101

+

0.022

C106

R103

L103

22uH

100

R112

6.8K
R107

R106

1.5K

330
R141

0.01
C154

0.022

C107

R105

1K

R108

330

0.01
C108

CF102

ST IND

Lch

GND

Rch

DO

CLK

CE

+12V

2

1

4

DI3

568

7

9

MUTE10

543

2

5

16

16

C133

R129

C132

R128

100P
C211

R213

C114

0.1

R114

100K

5

2

TC102

10P

3 4

R113

100K

L104

1 6

L105

2

C117

20P

3

C116

470P

1

546

2

3

1

L201

456

TC201

30P

10P
C206

R203 47K

C202 0.022

10K
R204

R202 22K

R201 22K

10K
R205

TC202

30P

C204

10P

1

2

3

L202

465

180P

C203

0.022
C147

22K

R207

10K
R208

100K
R206

0.022
C205

0.022
C201

5

8

2

1

647

3

ABB.

U.K.

DESTINATION

COUNTRY

EUROPE

T2

E3

68 1/2W

NO

YES

8.2K

C101

3.6K

R140

100u16

R123R103A

68 1/2W

R103

DESTINATION

COUNTRY

EUROPE

ABB.

E4

A

NO 100u16

R123

8.2K

R140

3.6K

C101

33 1/2W

R103

DESTINATION

COUNTRY

RUSSIA

ABB.

Q2

A

NO 220u16

R123

18K

R140

5.6K

C101

15K

R149

C130

C131

C161

C162

B

C128

GND

IF

C208

C207

R212

C215

C127

C149

C126

R132

R126

R127

100

R146

1000P

C157

B

B

YES

B

NO

YES

YES

VCC

GND

IF-OUT

VT

GND

ANT

IF-OUT

GND

VCC

OSC

VT

GND

GND

ANT

L106

22uH

1000P
C102

BAND

AM

FM

VOLTAGEQUENCY

LF

HF

LF

HF

1.1V

7.3V

1.2V

7.0V

VTFRE-

10K

R220

+B

2

1

3

5

4

11

10

9

8

7

12

AMAM

24

23

22

AM

OSC

ALC

BUFF

20

21

RF.AGCMIX

AM AM

19

18

AGC

IF DET

IF

LEVEL

DET

S-CURVE

FM

DET

FM

BUFF

FM

AM/

IF

COMP

TUNING

DRIVE

AM

REG GND

FM

STEREO

17

16

15

14

DECODER

MUTE

DRIVE

STEREO

13

SW

TRIG

FFFF

VCO

AM/

SW

FM

PHASE DET

PILOT

FF

DET

VCC

DESTINATION

COUNTRY

RUSSIA NO

Q1

A

ABB.

R123

33 1/2W

R103

YES

B

18K

C101

220u165.6K

R140

YES

DESTINATION

COUNTRY

DESTINATION

EUROPE NOE2

A

ABB.

COUNTRY

U.K. T1

EUROPE NOE1

A

ABB.

8.2K

R123

68 1/2W

R103

YES

B C101

100u163.6K

R140

8.2K

R123

NO

68 1/2W

R103

YES

B

100u163.6K

R140 C101

+5V

+B

+5V

+B

+B

+5V

+5V

+5V

+B

+5V

+B

+12V

+5V

+B +12V

+B+B

+B

+B

+B

+5V

+12V

+12V

+B

+B

+5V

+B

+B

+B

(Q) TYPE ONLY: FE101 (FE340-P01)

EXCEPT (Q) TYPE: FE101 (TFFJ4E553X)

B

IC102

RXD-301W(Q2)/351W(Q1) (2/5)

RXD-301E(E4)/351E(E2) (2/5)

RXD-301(E3,T2)/351(E1,T1) (2/5)

IC201

TUNER UNIT RXD-301(E3,T2)/351(E1,T1), RXD-301E(E4)/351E(E2), RXD-301W(Q2)/351W(Q1)

+B LINE

GND LINE

SIGNAL LINE

-CN101

AUDIO

4/5

ANTENNA

JK101

D101

D102

AM IFT

AM/FM

/MPX

SYSTEM

IC

PLL

IC102

IC201

Q101

Q105

Q106

Q107,108,205

Q109

D101,102,111,112,202

: 2SK161(R)

: DTC114YS

: 2SC945P/Q

: LC7218

: DTA114YS

: 2SC1675(L)

: LA1831

: 1SS133

T101

Q108

Q107

Q109

Q105

D202

D110

Q106

MUTE

CONTROL

L.P.F

RF

AMP

Q101

IF

AMP

CN101

COIL

A

COIL

MW OSC

D108

AM ANT

COIL

LW ANT

LW OSC

COIL

Q204

Q202Q203

Q205

D201

Q201

MIX

MIX

RXD-301

RXD-301E

RXD-301W

D112

D111

: 2SC2001L

: 2SC945P

: 2SA733P/Q

Q203,204

Q202

Q201

D110 : 5.6V

D108 : KV1561A-2

D201 : 1SS176T

RXD-351W

RXD-351E

RXD-351

4.4V

(5.0V)

2.1V

2.1V

2.1V

MONO: 4.7V

TUNED: 0V

ST: 0V

(5.0V)

4.5V

(3.6V)

2.4V

(1.4V)

3.4V

3.3V

(0V)

0V

(1.1V)

2.1V

(1.1V)

(1.9V)

1.5V

2.7V

(0.6V)

2.0V

2.1V

1.3V

1.3V

2.1V

(5.0V)

4.3V

2.9V
(3.7V)

0V (2.5V)

2.3V (0V)

(5.5V)

0V

0V

0V

3.3V (0V)

MONO: 0V

ST: 3.2V

4.1V

2.1V

2.0V

0V

0V

0V

OFF: 0V

ON: 4.5V

MUTE

MUTE

ON: 0V

OFF: 2.3V

11.5V

1.0V

5.0V

(5.5V)

1.3V

(0V)

5.0V

0.6V

1.0V

0.7V

3.8V

0.1V

4.1V

CAUTION: For continued safety, replace safety critical components only with manu-

facturer's recommended parts (refer to parts list). indicates safety critical compo-

nents. For continued protection against risk of fire, replace only with same type and

rating fuse(s). To reduce the risk of electric shock, leakage-current or resistance

measurements shall be ca rried out (exposed parts are acceptably insulated from

the supply circuit) before the appliance is returned to the customer.

MODE CARRIER

MODULATION

ANT INPUT

FREQUENCY DEVIATION

FM 98MHz 1kHz STEREO 67.5kHz 7.5kHz(Pilot) 60dB

AM 1000(999)kHz 400Hz MONO 30% MOD 60dB

The DC voltage is an actual reading measured with a high impedance type volt-

meter as the AM/FM signal generator is specified to the conditions as shown in the

list below. The measurement value may vary depending on the measuring instru-

ments used or on the product. The value shown in ( ) is actual reading mea -

sured in the AM mode.

2SD882 DTA114YS

DTA144ES

DTC114TS

DTC124ES

DTC114YS TC4066BP

NJM4558L UPC1237HA LA1831 LC7218

2SA733

2SA988

2SC1674

2SC1675

2SC1841

2SC2001

2SC2878A

2SC945