Kenwood KDC-2027SA, KDC-3027A, KDC-308A Schematics

A B C D E

4V

0

0

AMMIX2IN1

3

8

2

7

PGND2

KDC-2027SA/SAY/SG/SGY, 3027A/AY/G/GY
KDC-308A/AY/G/GY, 4027/V/VY/Y, F327A/G

1

REQ H

R404 100

C

∗

1K

R173

∗

19

L4

C522

33P

11

D405

D GND

CH CON

R405 4.7K

25

D3

GND

C594

∗

C523

∗

R543

MPX
BUFFER

0V

CHANGER CONNECTOR

J4

51

2

3

BU

4

Rch

MUTE

A GND

R402 10

R403 4.7

R406 4.7K

1

+

+

1u50

C402

C403

100u10

45

46

D402

D403

D410

L501

R501 6.8K

6.8uH

L502
33uH

C502

∗

C516 10P

R521

100K

∗

48P

∗

C529

2P

∗

L505

∗

∗

C526

D504

27P

100K

R522

14

6P

C528

∗

∗

L507

Q503

330P

R351 2.2K

15

R352 2.2K

14

C351

10u6.3

+

+

C353

10u6.3

RDS
DECODER

R541

1K

R542 4.7K

5.0V
0V

5.0V
0V

2.4V

2.4V

5.0V

0.01

C354

C545

5.6K

C352

D408

D501

C530

∗

C541

6800P

IC6

1
2

3
4

5

6
7
8

1096

117

128

4P

W401

13

RST

DATA C

R407 4.7K

8

W521

R524

C543

4P

C544

C542

22P

R544

2.2K

Q201

51

QUAL
RDDA

VREF
MPX

OSEL

GND
ARI
FILOUT

W530

R409 4.7K

C401

16

D401

D411

C504

0.01

C503

C507

33u10

FM RF
AMPLIFIRE

R523

C531

100K

68P

15P

NOISE
BUFFER

77

DATA H

Lch

R401 10

R410 100

+

1u50

17

44

AM RF
AMPLIFIRE

R502

2.2K

0.1
C505

4.7u16

0.1

C506

+

C591

33u10

100K

Q502

1

W533

W500

17

18

20

5.0V
0V

RDCL

OSCOUT

OSCIN

EXTRES

FSEL

D409

T57

VCC

R503

2.2K

TM

CLK

R411 100

18

+

+

R525

∗

∗

W402

16
15
14

13

4.332MHz
12

11
10
9

REQ C

R408 4.7K

63

R506

∗

L506

C533

0.01

R204 W512

1K

R205 4.7K

5.0V
0V
0V
0V

ELECTRIC UNIT
(X34-31xx-xx)

2

D407

ANT.

∗

J1

3

C524

∗

C525

∗

D503

4

5

∗

CN3

∗

C521

W505
W507

D506

2

1

6

0.01

C557

∗

∗

7

C558

0.01

PRE OUT

DAUGHTER UNIT

(X89-2590-10)

Q221,222

AUDIO Q222Q221
MUTE
SW

AUDIO
MUTE
DRIVER

Q225

CN91

Q221,222
Q225

D404

Q501

+

1M

C508

22u10

1mH

L503

R505

0.01

C534

C536

∗

C535

2P

W415

W504

100K

R527

∗

E

∗

W403

62

R353

2.2K
C356

10P

X2

C355

10P

FRONT

12

R225

100

30K

R229

270

4.7K

R221

+

C221

10u16

22K

DTC143TUA

:

DTA124EUA

:

L504

100uH

68P

C510

R507 1K

L513

4.7uH
L512

4.7uH

R526

5.6K

∗

W524

∗

R529

330

D505

100P

W102

3

7
6

8

10

12
13

15

22K

123 4

C509

1K

W601

R528
100K

57

61

20

R226

30K

4.7K

W101

W531

C222

3

R230

R222

10u16

5

C555

100

270

+

∗

17
18

1000P

CN90

WH1

C511

0.01

L510

4.7uH

C512

4.7u16

3

6
7

8

10
11
12

13
14

15

C600

5
4
3

2
1

+

C513 0.01
C514 0.01

C515 1

∗

C537

∗

C538

W523

R547 22

4.7uH

+

C546

100u10

L517

0.01

W160

∗

5.0V

60mV

0.7V

8.0V

3.2V

3.8V

8.0V

0V

0V

0V

0V

W534

∗

W508

∗

J5

Q40

22K

1

2
3

4
5

6
7

8
9

10

11

12
13

14
15
16

17
18

19
20

D

PRE OUT

∗

C227
680P

100

R231

R227

30K

4.7K

270

R223

+

C223

10u16

22K

12

L508

8.0V

8.0V

79

80

IFVCC

MIX1OUT1

VREF5V
TUNGND

AMMIX1IN+
AMMIX1IN­ANAGC1TC

ANAGC1OUT
ANAGC1VOUT

FMMIX1IN1
RFGND

FMMIX1IN2
FMAGC1OUT
FMAGCIN

FMAGCVOUT
FMANTADJ

FMRFADJ
OSCGND

VCOE
VCOB

OSCVCC

LFOUT

REAR

∗

C226

680P

R228

30K

Q224Q223

4.7K

W516

MUTE

MUTE
DRIVER

CF51

10.700MHz

0V

8.0V

77

78

MIX1OUT2

AM
FM

FM
AM

AM

AM
PW-ON

AM

FM0V2.0V

PW-ON0V2.8V

C224

R581

C581

∗

3.5V

76

IF1GND

3.3V

2.0V
0V

2.4V
0V

C547

10u10

C550

0.033

R232

R224

10u16

FR

FMNAGCIN

4.2V

3.3V
0V

3.4V
0V

+

100

270

+

W161

FL

1K

75

FMIFAMP1IN

4.1V

3.2V
0V

4.2VAM

LFREF

21

2.5V

C548 0.022

74

FMIFAMP1OUT

22

2.5V

C549

RR

C582
73

LFIN

R545

4.3K

RL

L511

C580

0.01

0.1

FMIFAMPREF

AM
FM

R546

2200P

4.7uH

2.5V

33K

C252

0.22u50

C253

0.22u50

8.0V

72

TUNVCC

PLLGND

LFHC

0V

∗

W156

C585

0.01

CF52

∗

10.700MHz

3.2V

2.0V
0V

2.4V

0.8V

PLLVCC

252423

8.0V

L514

IC4

∗

W40

∗

R25

4.7K

∗

W40

∗

R25

4.7K

CF53

∗

4.0V

70

71

FMIFAMP2IN

FMAMP2OUT

FM

26

10.25

4.7uH

0.01

C551

2

W509

10.700MHz

4.2V 0V

69

3.
0V

XTALG

X5

18

X34-3102-7x (1/4)

JIHGF

0

CF52

W156

45

KDC-2027SA/SAY/SG/SGY, 3027A/AY/G/GY

KDC-308A/AY/G/GY, 4027/V/VY/Y, F327A/G

∗

252
2u50

253
2u50

C585

0.01

10.700MHz

71

3.2V

2.0V
0V

2.4V

0.8V

PLLVCC

25

8.0V

L514

IC4

∗
∗

∗
∗

FMIFAMP2IN

4.7uH

C551

41

1u50

C255

0V

4.9V

4

2

STBY

PGND2

W407
R252

4.7K
W408
R253

4.7K

W509

C583 0.1

CF53

∗

10.700MHz

L509

4.0V

4.2V

4.2V

68

69

70

AMMIX2IN1

AMMIX2IN2

FMAMP2OUT

2.0VFM
0V

3.4V 4.8V

DIGGND

XTALD

XTALG

26

28

27

0V

X501

C552

0.0110.250MHz

C593

0.01

+

14.4V

0V

VCC1

TAB

1

0V

D268

CF54
450kHz

1

W511

8.0V

AM
FM

IC10

TUNER &
E-VOL.

3.4V0V

DIGVCC

30

29

8.0V

1

L515

4.7uH

C256

∗

PGND1

OUT2-

3

7.3V

RR-

IN

2

AM

TUNQUALITY

31

C553

∗

+

7.2V

1086

SVR

D264

GND

OUT

3

67

AMMIX2OUT

ISSTC

32

3.2V

C554 0.1

∗

R256

∗

OUT2+

5

7.4V

RR+

1.4V

1.2V
0V

FM

DEVTC

Q251

47K

W510

3.7V
0V

C561

10K

1K

C584

1u50

40

C254

R254

W406∗W405

∗

∗

OUT1-

9

7

7.3V

7.2V

D262

D265

FR-

0.1

C586

+

4.7u16
646566

AMAGC2TC

AMIF2AMPIN

5.0V
0V

FM 2.6V

APGND

VREF3V

33

34

8.0V

0V

C556

3.0V

1000P

+

C562
10u10

+

L516

C560
100P

W162

0.22u50

4.7K

7.2V

12

OUT1+

FR+

FMDEM AMIF2AMP REF

35

4.7uH

IN2

IN1

11

7.2V

C587

∗

SMETERC

0V

APVCC

3.9V

C251

SGND

15

13

0V

7.2V

C588

0V

DEMGND

OUTRR

3.9V

RR

0.22u50

4.7K

R251

∗

7.2V

14

IN4

OUT3+

IN3

17

7.3V

FL+

0.47

616263

TUNER
CHANGE

FMDEMREF

FM
AM

AM
PW-ON

OUTFR

OUTRL

39

383736

3.9V

3.9V

RL

FR

R261

∗

W409

∗

D266

OUTFL

40

FL

19

7.3V

ACRIN

50

R263

∗

750

R260

∗

+

1u50

C258

0V

7.3V

PGND3

ACGND

OUT3-

OUT4+

21

7.4V

FL-

D263

RL+

Q252,253

SMETERRC &
MPTHTC SW

5V
0V

4.2V

2.4V
0V

3.0V

1.9V
0V

3.0V

3.0V

W501

3.0V

1u50

C257

14.4V

201816

VCC2

OUT4-

23

7.4V

D261

RL-

MPTHTC

RDSMUTE

AUDIOMUTE

QUALITY
SMETER

4.0VFM
0V

5V
0V

5V
0V

FMMUTETC
TUNEROUT

TUNERIN

IN1COM

IN2COM

ACLOUT

ACROUT

+

HSD

25

D267

ACLIN

SCL

SDA

IN1L

IN1R

IN2R

IN2L

D253

∗

SD

39

3.4V or

F

4.4V

R257

D251

60
59
58
57

56
55

54

53

52
51

50

49

48

47

46
45
44
43
42
41

4.1V

22

C589

∗

6.2K

0V

24

MUTE

PGND4

POWER
AMPLIFIRE

0.1

∗

R565 100K

3.9V

C564

0.47

3.0V

C565

47u10

+

3.0V

3.0V

3.0V

3.0V

3.0V

3.0V

TH1
470

D252

C590

0.1

W519
W517

0.47u50

R567

1K

R566

1K

C563
+

∗

46
45
44

Q253

R561

D201D202

W158

∗

R258

∗

C592

2.7K

C205

2.2u50
+

C204

2.2u50
+

0.01

∗

SCL

SDA

Q252

∗

C568

E2P-ROM

35

58

5.0V
0V

R102

∗

57

M-RST

5.0V
0V

5

1K

Q20

L-RST

5

R21

33K

D20

C21

0.01

A. C. C
DETECTOR

R23 R12

100K 100K

56

R122 100

56

LO/EJ

M-STOP

5.0V
0V

5.0V
0V

AVREF1

L-CE

5.0V

6

R20

3.3K
1/2W

R22
10K

55

54

55

54

MOSW

CD-SW3

5.0V
0V

5.0V
0V

N.C

ADA

9

876

1K

R103

SDA

IC12

8

5.0V

VCC

7

0V

WP

1

A0

2

A1
A2
GND

0.01

R123

IC11

SCL

SDA

5.0V
0V

13

14

VCC

1

2

100K

R415

1K

5.0V 0V

61

61

62

63

∗

64

66

R133 12K

∗

C106

∗

R134

77

∗

W578

6

5

0V

1

2

VDD

3

4

2.2M

R128

R414 100K
R129 2.2K

R130 2.2K

C104

15P

C105

15P

R132

2.2K

2.2K

3

0V

4

5.0V

R201 47K

12

59

57

55

51

49

47

D40

IC8

MUTE
LOGIC

0V

C404

∗

1

8

C102

0V

12

0.01

D101

VOUT

VSS60NC

0V

5V
0V

5V
0V

0V

C101

R126

POWER
ON
RESET

R131

X1

4.194MHz

2.2-4.5V3.0V

0.6-4.1V

5.0V
0V

ADA

10K

R564

10911

543

+

100u6.3

100K

R127

2.2K

5.0V

6.8K

5.0V

ACL

C103 0.1

0V

0V

R563

61

62
63

64
65

66
67
68

69

70

71
72
73
74
75
76

77
78

79
80

10K

0V

6

5.0V

SCL

SDA

8

GND

7

0V

L101

4.7uH

REMO

R-CLK
CH-REQC

CD-SW1
KEY-REQ

CD-SW2
Vss0
VDD1

X2

X1
IC
XT2
XT1
VDD0
AVREF0
S-METER

0-4.0V

NOISE
PHONE

N.C
AVCONT

5.0V
0V

5.0V
0V

1

C40 0.01

60

5.0V
0V

8EJE SW

PANEL

2

1

2

R125 1K

59

RESET

5.0V
0V

5.0V
0V

5.0V
0V

N.C

3

595758

CP3
1Kx2

M-MUTE

AVSS

4

0V

CP2

2.2Kx2

N.C

5.0V
0V

∗

SYSTEM
CONTROL
u-COM

5.0V
0V

ACL

11

10

1K

R104

SCL

B. U.
DETECTOR

50

515253

DSI

N.C

IC1

L-DATAL

R106 100K

R10
30K

SURGE
DETECTOR

Q70

R73

100K

R11

10K

Q10

50

CP1
10Kx2

49

PS2-1

BEEP

5.0V
0V

5.0V
0V

R105 470

R121 2.2K

11

D70

48

PS2-0

5.0V
0V

or 0V

5.0V
0V

L-DATAS

131215

R107 2.2K

12

D10

36K

R72

R67 10K

∗

47

0V or 5.

L-CLK

14

13

PS1-2

R-DATA

14

R71
82K

R68 10K

46

PS1-1

R-QUAL

15

R69 10K

R413 100K

∗

X34-3102-7x (2/4)

19

K L M N O

2

0

O

PS2

0

4

ANT CONT

13

KDC-2027SA/SAY/SG/SGY, 3027A/AY/G/GY
KDC-308A/AY/G/GY, 4027/V/VY/Y, F327A/G

OR

TOR
D70

D10

R72

DC CONNECTOR

J2

4286

REAR Lch-

REAR Rch-

REAR Lch+

FRONT Lch-

FRONT Rch-

FRONT Lch+

FL-

RL-

FR-

FL+

RL+

R71
82K

36K

TEL
MUTE

10K

R30

C30

0.01

D30

∗

A

∗

R31

22K

R32

47K

∗

W532

SW
5V

7513

FRONT Rch+

RR-

Q51

D51

Q50

P-ANT

REAR Rch+

FR+

RR+

R57

R50

1210 14 16

P-CON

1.5K

R51

47K

5.6K

13 15119

ACC

PHONE

C63

22u16

+

(F1 10A)

FUSE

GND

SERVO
AVR
CONTROL

SERVO
AVR

Q55

IC1

B.U.

L1

140uH

GND

R25

∗

10u16

C53
10u16

10u16

10u50

R28

∗

4.7K

C52

+

+

C54

+

C55

C56

+

∗

Q53

D12

∗

D1

10u25

D50

4.7K

∗

D11

+

D14

∗

C1

220u16

∗

D13

27uH

+

3300u16

C57

+

POWER
SUPPLY
(MULTI AVR)

C50

C51

+

10u25

∗

L2

C58

VDD

VDD34

10u25

W410

∗

100u16

+

14.0V

14.0V

8.1V

7.9V

8.1V

14.3V

+

5.0V

5.0V

10.3V

IC7

0V

1

GND

2

P-CON

3

P-ANT

4

FM+B

5

AM+B

6

AUDIO+B

7

VCC

8

BU5V

9

VBU

7
5
3

10

1

SW1

11

1

SW2

12

ILLUM

IC4
IC6
IC7
IC8
IC10
IC11
IC12

Q10,20,70,101,201,503
Q40

Q50
Q51,53
Q55
Q102
Q223,224
Q251
Q252
Q253
Q501
Q502

D1
D3
D10,20,70,201,202,401,

402
D11,13
D12,14
D40,101,251-253

D50
D51
D103
D106,108,109,403-405,

407-410
D110
D411
D501,503
D504-506

SIGNAL LINE
GND LINE

B LINE

:

∗

:

∗

TDA7479AD

:

BA4911-V4

:

HD74HC27FP

:

TDA7513T:
PST3435UL:
BR24C01AF-W or:
M24C01-WMN6T or
S-24CS02AFJ-TB

2SC4081:
DTA124EUA:
2SA1036K

:

UMC2N:
2SD2375:
DTA114YUA:

:

DTC143TUA

:

DTC114YUA
UMG4N:

:

UMA1N
CPH5905:
3SK126:

1N5393G-M6

:

IMSA-6801

:
:

MA4068(N)-M
D1F60:
AM01ZNF:

1SS133:
DAN202U:
MA4082(N)-L

:

DA204U:
MA4062-L:

UDZS12B:
MA3062WA

:

RN739F:
KV1720S:

REAR L

REAR R

GRN/BLK

GRN

VIOL

VIOL/BLK

98

116

125

107

134

BLU

GRY

WHT

GRY/BLK

WHT/BLK

FRONT L

FRONT R

ANT. CONT

DC CORD
(E30-6322-05)

KDC-205/CR
KDC-105/126/126S
KDC-2026/3026/226

TEL MUTE

YELBLK

BRN

143

RED

BLU/WHT

OUT

P. CONT

GRN

152

161BU

89

WHT

ACC

GND

GRN/BLK

VIOL/BLK

10

7

GRY/BLK

WHT/BLK

VIOL

116

GRY

DC C
(E30-6

RX-29

125

BLU

-

5.0V
0V

r 0V

5.0V
0V

131615

R107 2.2K

R67 10K

∗

47

PS1-2

0V or 5.0V

L-CLK

R-DATA

14

14

13

R69 10K

R68 10K

PS1-1

R-QUAL

15

R413 100K

∗

444546

PS1-0

43

B.U-DET

ACC-DET

5.0V
0V

5.0V
0V

CH-DATAC

17

16

42

0V or 5.0V

5.0V
0V

5.0V
0V

CH-DATAH

CH-CLK

18

181917

41

R264 47K

R255 33K

41

SW5V

P-STBY

5.0V
0V

TUNER-TYPE0

TUNER-TYPE1

TYPE REF

CH-REQH

N.C

20

19

25

SVR

P-MUTE

5.0V
0V

CLK

DATA

MUTE

5.0V
0V

Vss1

TYPE0

TYPE1

TYPE2

CH-CON

AFS

∗

N.C

N.C

SD

N.C
N.C
N.C

D102

B

5.0V
0V

40
39

38

R117

37

R115

36

35

0V or 5.0V

34

0V

33
32
31

30

29
28

R110 4.7K

27
26

25
24
23
22
21

∗

R412 100K

R101

240

DSI
DRIVER

R259 22K

2.2K

1K

1K

R119 47K

5.0V

R58
470

Q101

ADJ

R118 10K

R116 10K

5.0V
0V

5.0V
0V

40
39

R174R108

47K

37

36

35

R114 47K

R113 47K

∗

R139 47K

∗

R140 47K

∗

R137 47K

∗

R138 47K

∗

R135 47K

∗

R136 47K

55

59

C142

R145

CN1

2.2K

54 SW322

55
56

47

49 Lch15

57
58

R144 100K

59

2

36 MSDA
37 MSCLK4

64

R141 4.7K

66

R143 4.7K

0.1

D103

∗

∗

W404

D110

∗

Q102
PANEL5V

47K

10K

SW

60

5

11

D109∗D106

∗

6
13 L-CLK
12

61

1

D108

∗

R175

∗

R169 1K

∗

R168 1K
R167 100

R166 1K
R165 470
R164 470

∗

R170

1K

∗

R171

47

R172

1K

10K

D111

∗

4.7K

R142

∗

W165

R163 10

∗

R176

1K

20
19

14
13

8

6
5

1
2

3
4
5

11

12

13

SERBOGND21
SERBO+B
MO SW
LO/EJ18
Rch1617
GND

AUDIO+B
M STOP
M RST12

N.C1011
M MUTE
D GND9
BU 5V

N.C7
MECHDET

SW13

SW22
D OUT1

∗

J3

D-GND
PAN5V

ILL-GND
LAMP+B
LED+B

RST6
L-RES87
L-DATAL

L-CE109

L-DATAS

REMO

SW5V
PANEL14

ESD-G15

P1

∗

WH2

to
MECHA
(X32- : CN2)

X16­J1

2/2

A

WIRED REM.

20

X34-3102-7x (3/4)