Alto X34SW Schematic

Service Manual

Model: X34SW (3-WAY STEREO PLUS SUBWOOFER )

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 (X34SW)

Subwoofer Frequency Range
Low - Mid Frequency Range
Mid - High Frequency Range
THD
S/N Ratio

Controls

Input Level
Output level
Low Cut
Phase

Power supply

Connector type
Type
Mains supply
Power Rating

Physical

Dimensions
Weight

50Hz ~ 250Hz
70Hz ~ 1KHz
480Hz ~ 7KHz
<0.05%

>80dB

continuously variable
Sub,Low,Mid,High continuously variable

Front panel switches
Front panel switches

3-pole IEC , grounded

Servo controlled , stabilized

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

8W

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

3.0 kg(6.62lb)

D

2.Block Diagram

4321

C

0v

+15V

-15v

B

A

BRIDGE

AND FILTER CIRCUIT

0V

20V

20V

Number RevisionSize

MID out

MID out

MID pass

VR

gain

SUB - LOW

1

A

pass filter

SUB-Low

3

2

pass filter

over freq.

TL074

50Hz +250Hz

pass filter

over freq.

Low -MID

70Hz +1KHz

480Hz - +7KHz

middle - high pass

VR

gain

LOW OUT

1

A

3

2

lower filter pass

high out

1

A

3

high pass freq.

TL074

2

PT-SCX-34

AC 100mA

VR

VR

TL074

102℃

230V

5 6

AC POWER SW

FUSE

gain

gain

0V

115V

50Hz

AC PLUG

AC INPUT 210V-240V

MID out

MID out

MID pass

VR

gain

SUB - LOW

1

A

pass filter

SUB-Low

3

2

pass filter

over freq.

TL074

50Hz +250Hz

pass filter

over freq.

Low -MID

70Hz +1KHz

480Hz - +7KHz

middle - high pass

VR

gain

LOW OUT

1

A

3

2

lower filter pass

high out

1

A

3

high pass freq.

2

TL074

TL074

Title

VR

VR

gain

gain

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A

3

213

A -CHANNEL SIGNAL

D

1

TL074

2

CN-BAL-FEMALE-2

VR

1

TL074

VR

gain

1 2 3 4

A

gain

A

3

2

213

B-CHANNEL SIGNAL

C

B

CN-BAL-FEMALE-2

D

3. Schematic Diagram

C

B

8

X1

220R

213

R26

R24

100K

C9

7654321

10uF

R23

10K

R19

10K

R27

220R

R25

100K

C8

10uF

14

U2D

12

13

R22

10K

8

U2C

TL074

9

10

10K

10K

R18

R20

R17

22K

C7

47P

6

C6

R16

R11

10K

330P

10K

R13

10K

R12

U1C

TL074

X2

220R

213

R45

R43

100K

C12

10uF

TL074

R38

R21

10K

SW1

SW-PBA/2P-BIG

7

U2B

TL074

5

R15

6K8

VR3

1

100KB

U2A

TL074

3

2

10K

R28

10K

8

R46

220R

R44

100K

C13

10uF

14

R42

10K

U3D

TL074

12

13

R41

10K

8

10K

U3C

TL074

9

R37

10K

R40

10

R39

10K

SW2

7

R36

22K

47P

C11

6

C10

R35

330P

10K

6K8

R34

1

R31

10K

3

2

R30

10K

14

R29

10K

U1D

TL074

X3

220R

213

R61

R59

100K

C21

10uF

4
5
6

10K

SW-PBA/2P-BIG

5

VR4

U3A

SW3

SW-PBA/2P-BIG

R54

22K

U3B

TL074

R53

10K

100KB

TL074

R32

10K

R62

220R

R60

100K

C22

10uF

14

R58

10K

U4D

TL074

12

13

R57

10K

1
2
3

8

U4C

TL074

R56

9

R55

47K

C19

683(M)

47P

C18

6

C17

330P

R52

VR5

100KB

100K

10

C20

683(M)

123

CN3

3P2.5

7

U4B

TL074

5

6K8

+15V

411

U1E

411

U2E

411

U3E

411

U4E

1

U4A

TL074

A

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ALTO Mobile : X34SW MAIN BOARD

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AGND

-15V

TL074

TL074

TL074

TL074

R6

D

9

7

C3

R10

180K

682(M)

10K

U1B

TL074

R8

1

U1A

TL074

2

R1

100K

C1

10uFC210uF

180K

VR1A

100KC

3

R3

5

6

10K

R5

R7

4K7

R2

100K

C5

682(M)C4682(M)

10

VR1B

100KC

R9

4K7

R4

100K

100K

12

13

C14

393(M)

R50

R47

5K6

CH1(CH2)

3

2

330K

R48

330K

VR2A

100KC

C16

393(M)

C15

393(M)

VR2B

100KC

R49

5K6

213

X4

1 2 3 4 5 6 78

C

B

A

D

C

B

A

X5

220R

R80

4

C30

10uF

213

R78

100K

R77

10K

3
2
1

SW4

SW-PBA/2P-BIG

6
5
4

14

R81

220R

R79

100K

C31

10uF

7

47P

C32

U10B

BA1458

5

6

R76

10K

ALTO Mobile : X34SW SUB WOOFER BOARD

Titel

U9D

TL074

R75

C29

C28

683M)

683M)

100K

123

J102

3P2.5

123

J101

3P2.5

AGND

12

321

13

R74

47K

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8

U10C

U9E

-15V

BA1458

TL074

R73

22K

47P

C27

C26

R72

10K

330P

U9C

TL074

9

10

6K8

R71

+15V

84

411

VR7

100KA

7

U9B

TL074

5

6

C23

473(M)

R69

300K

VR6B

100KC

R67

300K

R66

19K1

R65

10K0

1

VR6A

100KC

U9A

TL074

3

2

C25

473(M)

C24

473(M)

R68

19K1

1 2 34

R64

10K0

R63

10K0

D

CH1 CH2

C

B

A

D

4

C

B

A

R1

1.2K

CN5

2P2.5

1

2

SCX POWER Schematic

Number RevisionSize

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Date: 27-Jan-2002 Sheet of

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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

1000/16V

C5

104P

C18

1000/35V

DB1

RB154

123

CN?

D

C

CON3

1 2 34

B

A

4.Printed Circuit Diagram

X34SW(M) PCB LAYOUT

PCB : X34SW(M) Top Overlay

PCB : X34SW(M) Bottom Layer

PCB : X34SW(M) Bottom Solder Mask

PCB : X34SW(M) Bottom Overlay

PCB : X34SW(M) Drill Drawing Plots

Totals 330

Hole Size Hole Count
31mil (0.8mm) 254

39mil (1.0mm) 36
47mil (1.2mm) 24
59mil (1.5mm) 1
63mil (1.6mm) 1
87mil (2.2mm) 10
138mil (3.5mm) 4