Kenwood KCAS-220-A Service manual

SWITCHING UNIT

KCA-S220A

SERVICE MANUAL

Metallic cabinet (A01-4416-03)

T

O

H

E

A

D

U

N

IT

O

F

S

A

W

U

X

IT

O

C

N

H

R

A

U

X

L

IN

Cord with plug (E30-4276-15)

2m

T

O

U

N

IT

1

Screw set (N99-1797-08)

T

O

U

N

IT

2

Magic tape (Not supplied)

This product uses Lead Free solder.

This product complies with the

RoHS

directive for the European market.

KCA-S220A

CHANGER 1

Lch

Rch

HCLK DATAH DATAC

REQC

CH RST

REQH

CHCON0

CH MUTE

BU+14V

AGND

GND

IC1

BLOCK DIAGRAM

LOGIC VDD

IC3

ELECTRIC SW

VDD

X'TAL

RESET

VDD

CHANGER 2

Lch

Rch

HCLK DATAH DATAC

REQC

CH RST

REQH

CHCON0

CH MUTE

BU+14V

AGND

GND

Lch

Rch

AUX IN

B.U. DET

LOGIC VDDQ11,12,14

IC4

ELECTRIC SW

u-COM

8V DET 4V DET

AUX SW

VDD

LOGIC

VDD

Q15

5V AVR

IC6

8V REG

H/U

COMPONENTS DESCRIPTION

Lch Rch HCLK DATAH DATAC REQC CH RST REQH CHCON CH MUTE BU+14V AGND GND

● ELECTRIC UNIT

Ref. No. Name Function

IC1 µ-com For product control

For when the µ-com voltage 5V goes down to 3.7V or less, monitors the power supply voltage to prevent

IC2 Reset IC

the µ-com malfunctioning. IC3,4 Analog switch Receive the control signal from the µ-com and switch the changer 1, changer 2, and RCA sound input. Around Q15 Power supply circuit for the µ-com power supply 5V IC6 Regulator IC IC for analog switch IC power supply (8V)

2

EDCBA

KCA-S220A

PC BOARD (FOIL SIDE VIEW)

ELECTRIC UNIT

D31

D34

R70

JC10

Q6

R72

R25

JC1

D28 D27

BE

8

14

IC3

1

7

C4

C3

D12

R69

R29

Lch

Rch

J2

J1

REQC

CN2

REQH

14

58

912

DATAC

D13

RST

13

D32

JC9

AGND2

MUTE

CLK

R71

J54

C1

J3

DATAH

R91

R89

J4

D23

C2

R90

Q12

D11

J5

CHCON

AUX IN

LR AUX

A.GND

R82

R81

D24

R83

Lch

R88

R87

Q11

R86

R67

R26 R21

R27 R28

R30 R22 R23

J6

J7

R84

BE

C5

R74

J52

J53

BEBEBE

D10

R68

R19

D9 D8 D7

D35

D16

D17

R24

D18

Q13

R14

Rch

D19

CN4

JC8

Q14

R93

EB

J50

Q8

C6

R94

14

IC4

J51

1

R15

J9

J11

J10

D33

J8

RST

D5

R13

R11

R16

REQH

D38

ON

R73

8

7

Rch

J12

D15

OFF

SH1

AUX.SW

C8

R77

JC7

R78

JC6

C7

R75

C20

R76

Lch

AGND1

J15

J14

J17

J16

J13

CN1

14

58

912

13

MUTE

REQC

DATAC

D30

JC5

J18

CLK

R38

J19

JC4

R39 R40

R50

R49 R48 C10

J45

DATAH

Q2

R47

J20

CHCON

R12

BE

J21

R18

D22

R20

R37

R42

R46

J22

R17

C14 R43

R44 R45 C11

R36

J23

R35

BE

1

RESET

R31

JC3

J47

J46

J48

J25

60

61

IC1

80

1

J43

J44

R59

R60

J27

J26

D5

R8

J41

R53

J42

R55

JC2

J28

J29

J30

D3

D2

MUTE

R7

R10

R6

R34

C15

X1

Q3

R57

R54 R58

J24

D4

Q4

R32

C12

C13

41

20

IOG

EB

40

21

R85

D29

J39

J40

R61

R62

R63

R64

BU+14V

D36

GND

R92

D1

R1

R3

REQH

14

58

912

REQC

J31

CN3

Rch

13

Lch

IC2

SW1

5V

C19

D37

J33

CHCON

R9

SW2

R4

R5

R33

C18

R79

R80

GOI

EB

IC6

Q10

J55

C21

EB

Q7

2

Q5

EB

R95

D21

D20

R52

EB

C16

Q1

C9

J38

J37

J36

C17

Q15

R2

Q9

J32

EB

D26

D25

3

TO UNIT 2 TO UNIT 1 TO HEAD UNIT

ELECTRIC UNIT

Ref. No. Address

IC1 2D IC2 2D IC3 2A IC4 2B IC6 2E

Q1 2E Q2 2C Q3 2C Q4 2D Q5 2D

Ref. No. Address

Q6 2A Q7 2E Q8 2B

Q9 3D Q10 2E Q11 3A Q12 3A Q13 2B Q14 2B Q15 3D

4

5

6

Refer to the schematic diagram for the values of resistors and capacitors.

7

3