Kenwood KAC-6201 Schematics

1

P

22u16

2

3

A B C D E

AUDIO UNIT (X09-5650-10) (A/3)

Q21

A-class power
supply controller

(X09- ) (B/3)
SP IN

J3

Lch 1

Rch 2

CN1

1

2

3

4

IC1

: UPC4574C

IC3

: NJM4565D

IC4

: UPC494C

Q1,2,7,8,19,23,24,35,36,38-40
Q3-6,37

Q9,10
Q11,12
Q13,14
Q17,18
Q21
Q22
Q25,26
Q29,30
Q31,32
Q41

: 2SC945(A)(Q,P)
: 2SA733(A)(Q,P)
: 2SC945(A)(Q,P)
: 2SC1627A
: 2SA817A
: IRFIZ34G
: 2SC3940A(R,S)
: DTA124EL
: 2SA992(F,E)
: 2SC5100LB
: 2SA1908LB
: 2SC1845(F,E)

C25

22u35
+

C27

R37

2.2K

22u35
+

C28

22u35
+

C26

R38

2.2K

22u35
+

D1-4,8,16-19,25-30,32,33,36-42
D7

D9,10,34
D11,35
D13
D14
D15
D31

R41

18K

R43 18K

: 1SS133
: RD7.5JS(B)
: RD16JS(B)
: RD8.2JS(B)
: FMU22S

∗

: FMU22R

∗

: 1N5406-M
: RD5.1JS(B2)

A
A

R75 R74

1.5K

1.5K

D12

29.0V

Q21

D27

C38

29.0V

+

100u35

30.0V

R58

R59

22K

100

34.5V

C39

1u50

R60

10K

Q19

0V

Q19

P-con
detector

+

0.21V

D36

R62

R61

R64

27K

680K

27K

C13

4

5

6

(X09- ) (C/3)

RCA IN

J2

Lch

Rch

D1

D2

C5

10u50

+

C7

R1 1K

R5

10K10K

C1 1000PC2 1000P

CN2

4

3

2

1

R6

R2 1K

C6

10u50

+

D3

IC1

0V

(1/4)

5
6

22P

0V

R49
10K

INPUT
SENSITIVITY

R47

10K

R46

10K

R48
10K

0V

C8

22P

2
3

0V

D4

SIGNAL LINE
GND LINE

B LINE
B LINE

0V

0V

1

IC1

(2/4)

R42 18K

2.2K

R15

C15

0.01

R14

2.2K

1K

R13

2.2K

2.2K

0V

R7

20K

R17

R16

0V

R11

2.2K

R12

2.2K

VR1 5K

R157

150

56

R9

R159

150

R3R4

R44

2.2K

2.2K

R160

150

56

R10

R158 R8

150

18K

7

18.1V

IC1

(3/4)

10

4

9

C11C12

22P

0V

R19
20K

S1

STEREO/L+R/L(MONO)

W93

W125

23

R20
100

20K

R18
20K

0V

0V

22P

13

14

12

IC1

11

(4/4)

-17.5V

IC1

Isolation amp.

0V

8

R21

100

R27

4.7K

1

R26 4.7K

4

-17.5V

R34

C20

1

27K

0.082

R35
27K

IC3

L.P.F.

0V

0V

R45

R36

1K

C22

0.022

5
6

0V

C21

27K

0.12

IC3

0V

(1/2)

3
2

R28

4.7K

0V

R29

1.8K

IC3

(2/2)

18.1V

8

+

C17

C19

0.33u50

0.1u50
+

R31

6.8K

0V

7

R301KR32

C18

0.47u50
+

C16

+

2.2u50

R33

22K

1

5

8.2K

W119

W122

6

S2

32

HP/NORMAL/L

7

2SA733(A)

NJM4565D UPC4574C UPC494C
2SA817A
2SA992
2SC1627A
2SC1845
2SC3940A
2SC945(A)

B

C

E

7

)

34.5V

R61

+

C39

R62

1u50

R64

R60

10K

0.21V

Q19

0V

Q19

P-con
detector

D36

S2

3

P/NORMAL/LP

7

27K

680K

27K

C13

22u16

C14

R63

R65

+

2.7K

2.2K

TH1

D9

+

22u16

C41

4

8

D10

+

10u50

R68

10K

680

R66

D28

R69

D31

4.7K

R73

6.8K

R51

150K

C79

22u16
+

R25

3.3K

Q1,2

Muting
transistor

R24

3.3K

R22

1.5K

R52

1000P

R67
16K

15.3V

3.3K

0V

D17

0V

D16

2.35V

0.63V

C40

1.75V

C42

18.1V

Q22

R23

1.5K

C80

22u16
+

3.8V

0.1V

3.8V

0V

0.1u50

Muting
driver

-4.2V

Q1

0V

Q2

0V

IC4

1
2

3

4

5

6

7
8

Q36

P-con detector

+

C49

2.2u50

0V

C48

220u16

0V

C54

OSCILLATOR

17.0V

+

+

2200P

C50

22u35

ERROR

AMP

R71

R70

D35 D11

+

REFERENCE

3.6K

2.7K

0.26V

R81 82K

R80 82K

16
15

14

13

12

REGULATOR

11

15.1V

10

0.57V

9

0.57V

D32D33

470 1W

D18

R79

0.9V

Q3

-33.8V

R83

C51 1800P

+

C100 0.1u50

R86

3.9K

0.1V

R78

Q4

7.5K

Q3-8

Differential amp.

R76

7.5K

820

R82

5.1V

C37

Q5

820

-33.8V

0.8V

Q37

14.5V

Q36

0.1

D8

R85

R84

Power
switch

0V

820

820

IC4

Switching regulator

15.3V

Q37

R53

1.2K

R54

1.2K

R57

30K

0V

R56

3.3K

C43

470u35

+

R9891R99
330

1/2W

R95 3.3K
R97 3.3K

+

C55

22u35

C57

82K

R89

0.26V

R87

7.5K

-33.8V

-33.8V

R161

+

-34.5V

R91

100

C53

22u35

C59

4700P

C61

100P

-1.26V

-1.26V

Q8

C62

100P

-33.8V

C60

4700P

R90

100

C58

10P

Q6

R88

82K

0.2V

C56

22u35

0V

R126

R125

6P

47K

R93

56

Q7

-34.5V

+

0.75V

Q40

R77

R92

Q17,18

Power switching

D26

R124
390

5.4V

1.5K

1.5K

D25

R123

390

5.4V

0V

10

56

R94

3.3K

R96

3.3K

15.2V

Q18

0V

Q17

R168

0V

D34

16

C77

10u

4.7K

R167

R72 470 1W

Q9,10

For temperature

-compensating

3K

R101

D29D30

VR3 470

VR3

1K

R103

17.0V

2.3V

Q35

1K

R102

VR2 470

-0.54V

3K

R100

15.2V

4.7K

Q40

Overvoltage
protection

+

1.12V

-0.58

Q9

-1.26V

IDLE
ADJ

Q35

A-class
muting

-1.23V

IDLE
ADJ

Q10

1.19V

DC/DC converter

T1

D7

Q41

R105

100

D37D39

Q23

Q25

C63C64

1000P

R107

100

0V

R106

100

Q26

1000P

Q24

D38 D40

R104

100

D41

D42

R175

R177

R178

R176

3K

3K

3K

3K

R122

10 1/2W

C70

1000P

R55

3.3K

C85

100u
+

R179

10K

R180

22K

50

C81

C83

C84

C82

4700P

4700P

-1.26V

-1.23V

4700P

4700P

1.17V

D13

D14

Q29-32

Power
stage

-0.66V

-34.8V

-0.62V

Q12

C71

100P

1.13V

0.55V

Q13

C73

100P

C72

100P

0.55V

C74

100P

Q11-14

Power amp

34.5V

Q11

R109

220 1/2W

-34.8V

Q14

R174

220

R108

R172

34.5V

R171

1K

R173

1K

-34.8V

Q32

1K

1/2W

1K

0V

Q31

0V

C46

2200u352200u35

C47

R113

R115

R114

+

+

0.1

0.1 2W

0.1

R112

34.5V

34.5V

Q29

0V

2W

0V

2W

0.1

Q30

JIHGF

1

D19

Q38

Q39

0V

DC protection

0V

+

C75

R166 5.6K

47u16

E3

Q38,39

3.38V

2

C45

3300u

16

+

L1

3

D15

F1(25A)

BATT
GND
P-CON

R164 100K

R163 100K

C67

0.047

R127

10

Lch

4

SP OUT

Rch

J1

TP1

C68

R128

0.047

2
1

10

5

2W

6

KAC-6201

CAUTION : For continued safety, replace safety critical components only
with manufacturer's recommended parts (refer to parts list).

Indicates safety critical components. To reduce 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.

• DC voltages are as measured with a high impedance voltmeter. Values

may vary slightly due to variations between individual instruments or/and
units.

7