Alto X40 Schematic

Service Manual

Model: X40 (4-WAY STEREO )

ACTIVE CROSSOVER

www.altoproaudio.com

Version: 1.1

CONTENTS

1. Specification

2. Block Diagram

3. Schematic Diagram

4. Printed Circuit Board

5. Wiring Diagram

6. Test Procedure

7. Electrical Parts List

8. Exploded Views & Mechanical Parts List

9. Notes

Electrical

1. SPECIFICATION (X40)

SUB-LOW Frequency Range

LOW-MID Frequency Range

MID-HIGH Frequency Range

HUM & Noise

SUB e @ 0db)S ction ( utputO

LOW Section (Output@0dB)

MID S (O @0dB)ection utput
HIGH Section(Output @0dB)

S/N Ratio

Controls

Input Level

Output Level

CD Boost

Mute

Phase

30Hz-250Hz

100Hz-1KHz

1KHz-9KHz

Av=0dB, fc=46,200,1K,5KHz

-95dBu

-94dBu

-94dBu

-92dBu

114dB

continuously variable

SL Hub , ow, igh variableMid, continuously

rear panel switch

S,L M,Hub ow, id igh front panel switches

rear panel switch

Power Supply

Connector type
Type

Mains supply
Power Rating

Physical

Dimensions

Weight

3-pole IEC , grounded
Servo controlled , stabilized

95-120V /210-240V ,60-50Hz

10 W

483(W) 194.5(D) 44(H)mm (19" 7.7" 1.7")

3.1Kg(6.84lb)

D

2.Block Diagram

4321

C

0v

+15V

-15v

B

A

BRIDGE

AND FILTER CIRCUIT

0V

SUB - LOW

20V

20V

SUB - LOW

Number RevisionSize

MID out

1

A

MID pass filter

3

2

TL074

VR

gain

1

A

pass filter

SUB-Low

3

2

pass filter

over freq.

TL074

30Hz +250Hz

pass filter

over freq.

Low -MID

100Hz +1KHz

900Hz - +9KHz

middle - high pass

VR

gain

LOW OUT

1

A

3

2

lower filter pass

high out

1

A

3

2

high pass freq.

PT-SCX-34

TL074

TL074

102℃

230V

AC POWER SW

5 6

AC FUSE100mA

FUSE

VR

gain

MID outMID out

gain

VR

0V

115V

AC INPUT 210V-240V

AC PLUG

50Hz

MID out

1

A

MID pass filter

3

2

TL074

VR

gain

1

A

pass filter

SUB-Low

3

2

pass filter

over freq.

TL074

30Hz +250Hz

pass filter

over freq.

Low -MID

100Hz +1KHz

900Hz - +9KHz

middle - high pass

VR

gain

LOW OUT

1

A

3

2

lower filter pass

high out

1

A

3

2

high pass freq.

TL074

TL074

Title

VR

VR

A4

gain

gain

Date: 2-Nov-2002 Sheet of

File: D:\pc42\pc42\ALT O\ \X40\X40 BLOC K DIAGRAM.DDB服務手冊 Drawn By:

MID outMID out

1

gain

A

3

2

213

A -CHANNEL SIGNAL

D

VR

TL074

CN-BAL-FEMALE-2

C

1

A

3

2

213

B -CHANNEL SIGNAL

B

gain

VR

TL074

CN-BAL-FEMALE-2

1 2 3 4

A

7654321

3. Schematic Diagram

8

D

R89

9

10

R118

150R

R117
150R

IC1C

MC33079

R104

2K7

2K49

R90

10K0

+15V

R91

10K0

R105

4K7

6

5

R106

27K

C81

100/25V

C76

182(M)

C79

100/25V

C82

182(M)

8

R107

7K5

R108
100K

IC3B

MC33079

R119
100K

R122
100K

R93
15K

R94
3K57

VR8D

B50K

R92

10K0

7

13

12

R109

1K5

1
3
2

S5

CN-BAL(MALE)

HIGH OUT 1

IC1D
MC33079

-15V

SW7

SW-PBA/2P

HIGH

C71
182(M)

LD4

D8

LED

HIGH CLIP

14

R124
3K57

VR8C

B50K

R96
15K

R95

10K0

2

3

IC2A
MC33079

C72
182(M)

XOVER FREQ 900Hz + 9KHz

IC2C

MC33079

C74

182(M)

8

R97
10K0

R101

6

5

IC2D

MC33079

1

VR8B

B50K

R98
15K

13

12

10K0

IC2B

MC33079

14

C73

182(M)

7

P1

R100

15K

VR8A

B50K

R99
10K0

9

10

SW1

+15V

D4

-15V

4148

D2

4148

R82

10K0

S1

CN-BAL(FEMALE)

1
3
2

C1

104P/250VAC

C

B

A

R80

10K0

R81

10K0

D3

4148

D1

4148

2

3

IC1A
MC33079

C4

220P

C2

220P

R83

10K0

R120
2K49

1

C5

R65

20K0

R1

825R

822(M)

100/25V

VR1
10KB

C42

SW-PBA/2P

CD BOOST

R84
10K0

6

5

R85

10K0

VR3

10KB

R86

10K0

IC1B

MC33079

R102
4K99

R110
10K0

R112

10K0

R113
10K0

R114
10K0

7

2

3

R103
27K4

C75

220P

R111

10K0

9

10

220P

R116
10K0

13

12

R115

10K0

C80

R123

R88

15K0

R87

10K0

SW8

SW-PBA/2P

IC3A

MC33079

IC3C
MC33079

IC3D

MC33079

1

8

14

D

C

B

A

1 2 3 4 5 6 78

Titel

ALTO Mobile : X40 MAIN BOARD

Size

Date:
File:

A3

27-Jan-2002

X40-1(M).Sch

X40

Sheet
Drawn By:

RevisionModel No:

TASY J.S.

V1.0

21of

R41

15K0

R42

2K49

R40

10K0

7654321

XOVER FREQ 100Hz + 1KHz

8

IC4B

MC33079

9

10

IC6D

MC33079

2

3

R18

27K4

C8

220P

R76

C15

220P

C64
153(M)

7

C48

683(M)

IC6C

MC33079

R32

10K0

SW3

SW-PBA/2P

IC9A
MC33079

R126

10K(8B)

IC9C
MC33079

R149

10K0

IC9D
MC33079

R44

IC4A

MC33079

6

5

R22

100K

R68
1K5

D6
LED

LOW CLIP

SW5

SW-PBA/2P

1
3
2

10K0

IC6B

MC33079

LD2LD3

-15V

S3

CN-BAL(MALE)

LOW OUT 1

1

C50

683(M)

2

C52

683(M)

R20
4K7

6

5

R23
27K

C20

100/25V

C22

100/25V

1

R148

10K0

VR5B

B50K

R48

49K9

R21
7K5

IC8B
MC33079

R7

100K

R8

100K

R49

10K0

3

7

D

P1

R36 2K49

9

10

IC5C
MC33079

R28
7K5

IC7B

MC33079

R11
100K

R12
100K

R34 10K0

R54

10K0

7

8

R27

100K

R69
1K5

D7
LED

MID CLIP

SW6

SW-PBA/2P

1
3
2

CN-BAL(MALE)

MID OUT 1

49K9

3K57

-15V

S4

R61

R35

VR5D

B50K

R62

10K0

13

12

IC5D
MC33079

VR7

10KB

R137

10K0

R136

10K0

R74

10K0

R138
10K0

R139
10K0

R25

4K99

C53

683(M)

9

10

13

12

2

3

14

C28
220P

R33

3K57

R24
27K4

R77

10K0

VR5C

B50K

R50

49K9

SW4
SW-PBA/2P

IC8A
MC33079

R135
10K0

IC8C
MC33079

IC8D
MC33079

R51

C25
220P

2

3

IC6A

MC33079

+15V

R71

1

2K7

R6

150R

C17

182(M)

8

R132
10K0

R9

150R

14

C24

182(M)

R37

15K0

6

5

C

R39

10K0

IC5B
MC33079

7

R38

10K0

+15V

VR6

10KB

R30

4K99

SW2

SW-PBA/2P

2

3

IC7A

MC33079

R31

27K4

R29
4K7

6

R72

1

2K7

5

R26

27K

B

C30

100/25V

R144

10K0

R145

10K0

R10

150R

C36

220P

R143

9

10

10K0

IC7C

C27

182(M)

8

MC33079

R75

10K0

R146

10K0

A

R147
10K0

R78

C35
220P

R140

10K0

C34

C32

100/25V

13

12

IC7D

R13

150R

14

MC33079

182(M)

R63

10K0

R43
3K57

7

R64

10K0

6

5

VR4D

B50K

XOVER FREQ 30Hz + 250Hz

R47

10K0

VR5A

B50K

VR2

10KB

R129

10K

R128

10K

R130

10K0

R73

10K0

R131

10K0

R19
4K99

14

9

10

13

12

R46

49K9

R45

3K57

R60

10K0

9

10

VR4C

B50K

R59

10K0

8

100/25V

100/25V

12

13

C9

MC33079

C16

C61
153(M)

IC4C

MC33079

411

IC9E

R58
10K0

VR4B
B50K

13

12

8

MC33079

R57

10K0

411

C43

100/25V

IC8E

MC33079

C44

100/25V

IC4D

C60
153(M)

C39

100/25V

MC330079

C40

100/25V

14

411

IC7E

R55

10K0

VR4A

B50K

R56
10K0

C41

100/25V

MC33079

C45
100/25V

2

3

IC3E

C57
153(M)

1

IC5A

MC33079

-15V
LD4
LD3
LD2
LD1

+15V

R201

2R2 1/2W

411

AGND

C38

1000/25V

CN2
4P2.0

1
2
3
4
5

CN1
3P2.5

1
2
3

D

C

C37

1000/25V

R202

2R2 1/2W

-15V

+15V

R15
4K7

6

R70

1

2K7

5

R17
27K

R2

150R

C7

182(M)

C10

100/25V

R14
7K5

IC9B

MC33079

D9
LED

SUB CLIP

R3

100K

7

-15V

R16

100K

R67
1K5

LD1

C3

104P

MC33079

C6

104P

411

IC4E

C56
104P

MC33079

C58

104P

C54
104P

MC33079

C55

104P

IC2E

IC6E

411

411

C59
104P

MC33079

C62
104P

C49

104P

MC33079

C51
104P

411

IC1E

411

IC5E

B

8

CHS1CHS2

1
3

R5

150R

14

C14

182(M)

C12

100/25V

R4

100K

2

CN-BAL(MALE)

SUB OUT 1

S2

Titel

ALTO Mobile : X40 MAIN BOARD

Size

Date:
File:

A3

X40

27-Jan-2002

X40-2(M).Sch

Sheet
Drawn By:

RevisionModel No:

TASY J.S.

V1.0

22of

A

1 2 3 4 5 6 78

D

4

C

B

A

R1

1.2K

CN5

2P2.5

1

2

SCX POWER Schematic

Number RevisionSize

A4

Title

Date: 27-Jan-2002 Sheet of

File: D:\pc42\pc42\pc42\S-OVER\SCX202S\SCX202S\SCX202S.ddbDrawn By:

CN3

C7

123

C9

1000/16V

3P2.5

104P

IC2

C4

C19

-15V

L7915

104P

1000/35V

CN2

3P2.5

-15V

123

C8

104P

+15V

+15V

321

C6

IC1

L7815

C5

C18

1000/16V

104P

1000/35V

DB1

RB154

123

CN?

D

C

CON3

1 2 34

B

A

4.Printed Circuit Diagram

X40(M) PCB LAYOUT

PCB : X40(M) Top Layer

PCB : X40(M) Top Solder Mask

PCB : X40(M) Top Overlay

PCB : X40(M) Bottom Layer