Alto X23 Schematic

Service Manual

Model: X23 (2-WAY STEREO 3-WAY MONO)

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 (X23)

LOW-MID Frequency Range

MID-HIGH Frequency Range

HUM & Noise

LOW Section (Output@0dB)

HIGH Section(Output @0dB)

S/N Ratio

Controls

Input Level
Output Level
CD Boost
Mute
Phase

Power Supply

Connector type
Type

Mains supply
Power Rating

Range 1 80Hz - 1KHz

Range 10 800Hz - 10KHz

AV=0dB, fc=800Hz

-106dBu

-97dBu

118dB

continuously variable
low, high continuously variable
rear panel switch
low, high front panel switches
rear panel switch

3-pole IEC , grounded
Servo controlled , stabilized

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

8.5W

Physical

Dimensions

Weight

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

3.1Kg(6.84lb)

D

2.Block Diagram

4321

C

B

A

+15V

20V

PT-SCX-34

102℃

230V

5 6

0v

-15v

BRIDGE

AND FILTER CIRCUIT

0V

20V

0V

115V

AC POWER SW

LOW OUT

A

FREQ. CONTOLL

A

1

3

2

pass filter

over freq.

Low -MID

1

3

2

OR MID OUT

TL074

100Hz +1KHz

80Hz - +920KHz

TL074

high out

A

3

VR

VR

1

gain

gain

2

or low out

TL074

VR

LOW OUT

OR MID OUT

1

VR

gain

A

gain

FREQ. CONTOLL

A

3

2

pass filter

over freq.

Low -MID

1

3

2

TL074

100Hz +1KHz

high out

1

A

3

80Hz - +920KHz

gain

VR

TL074

or low out

TL074

2

VR

Title

Number RevisionSize

A4

Date: 29-Oct-2002 Sheet of

File: D:\pc42\pc42\ALTO\ \X23\X23.ddb服務手冊 Drawn By:

gain

D

100mA

FUSE

AC PLUG

50Hz

AC INPUT 210V-240V

213

A -CHANNEL SIGNAL

CN-BAL-FEMALE-2

C

213

CN-BAL-FEMALE-2

B-CHANNEL SIGNAL

B

1 2 3 4

A

R281

3. Schematic Diagram

560R

8

D

+15V

-15V

C

7654321

SW205

SW-PBA/6PC

STEREO/MONO

D

SW201

SW-PBA/6PC

X7

X8

CN-BAL(FEMALE)

C101

104P/250VAC

C298

D204

4148

R203
10K0

D202
4148

822(M)

2
22
33
3
11
1

1
3
2

R201

10K0

R202
10K0

D203
4148

D201
4148

+15V

-15V

CD BOOST

R205

10K0

R283
825R

C202
220P

R204

C204

220P

10K0

IC201A

MC33079

1

2

3

R288

10K

VR201
10KB

C242

100/25V

R250
10K0

IC201B

R251
10K0

MC33079

7

R252
10K0

6

5

C

9

10

R245 3K57

R242 2K49

R240
10K0

R241
15K0

IC201C

MC33079

R243
3K57

S-HG2

R244
10K0

8

VR204D

B50K

C210

153(M)

R262
10K0

R261
10K0

6

IC205A

4066

9 8

R278 6M8

C264

13

182(M)

12

IC201D

MC33079

14

VR204C

B50K

IC205B

11 10

4066

C209

153(M)

R260
10K0

2

3

IC202A
MC33079

R259
10K0

12

R277 6M8

VR204B

C261

182(M)

B50K

IC205C

4 3

4066

C211

153(M)

R258
10K0

R257
10K0

6

5

1

XOVER FREQ 80Hz + 920Hz

5

R274 6M8

IC202B

MC33079

C260

182(M)

VR204A

7

B50K

IC205D

4066

C212

153(M)

R256
10K0

R255
10K0

9

10

IC202C

MC33079

13

R273 6M8

182(M)

C257

R239
3K92

RANGE

X1X10

R276

12

10K0

147

R275

IC205E

100K

8

13

12

4066

IC202D
MC33079

C266

47/25V

14

S-HL2

SW204
SW-PBA/2P

C267

47/25V

D206 6V8 1/2W

D205 6V8 1/2W

R282 560R

+15V

C213

411

104P

IC201E

MC33079

C214
104P

6

5

6

5

R272

2K67

R271

2K67

R226 10K0

R229

10K0

R221 10K0

R223

10K0

IC203B

MC33079

IC204B

MC33079

7

-15V

7

-15V

R228
100K

R279
1K50

LED-HG2

HIGH CLIP

R222
100K

R268
1K50

LED-HL2

HIGH CLIP

D207

LED

D2061

LED

R264

10K0

R263

10K0

R294

R291

10K0

10K0

R290

10K0

R253
10K0

10

10

+15V

C231

R231
27K4

220P

R284
10K0

2

3

IC203A
MC33079

B

S-HG2

SW203

SW-PBA/2P

VR203

10KB

R285
10K0

R230
4K99

R227
7K50

1

+15V

C233

220P

R287
10K0

R225
4K99

A

S-HL2

SW202

SW-PBA/2P

VR202

10KB

R224
27K4

R286
10K0

2

3

IC204A
MC33079

R220
7K50

1

C203

411

C263

100/25V

104P

IC202E

MC33079

C206
104P

C228
220P

C218
220P

IC203C

MC33079

IC204C

MC33079

9

9

R210
150R

C227

182(M)

R206
150R

C217

182(M)

R295
10K0

8

C230

100/25V

R254

10K0

8

C220

100/25V

C265

100/25V

R265

10K0

R266
10K0

R292

10K0

R293

10K0

411

IC204E

MC33079

13

12

13

12

C243

100/25V

IC203D
MC33079

C234
182(M)

IC204D
MC33079

C224
182(M)

C244

100/25V

IC203E

MC33079

C235

220P

14

C225

220P

10K0

14

411

R296
10K0

R213
150R

R289

R209
150R

C238

470/25V

C232

100/25V

C222

100/25V

R211
100K

R208
100K

C237

470/25V

R212
100K

R207
100K

C208

104P(C)

C207

104P(C)

R103

2R2 1/2W

-15V

R102

2R2 1/2W

456

1

3

2

SW206

SW-PBA/2P

HIGH PHASE

AGND

J101
3P2.5

1
2
3

2
22
33

3
11

1

1

3

2

2
22
33

3
11

1

1

3

2

X12

HIGH

X11

X10

LOW

X9

Titel

ALTO Mobile : X23 MAIN BOARD

Size

Date:
File:

A4

27-Jan-2002

X23.Sch

X23

Sheet
Drawn By:

RevisionModel No:

TASY J.S.

B

A

V1.0

11of

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

Title

A4

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

X23(M) PCB LAYOUT

PCB : X23(M) Top Layer

PCB : X23(M) Top Solder Mask

PCB : X23(M) Top Overlay

PCB : X23(M) Bottom Layer

PCB : X23(M) Bottom Solder Mask

Totals 225

PCB : X23(M) Bottom Overlay

PCB : X23(M) Drill Drawing Plots

Hole Size Hole Count
24mil (0.6mm) 73

31mil (0.8mm) 68
39mil (1.0mm) 36
47mil (1.2mm) 36
59mil (1.5mm) 2
87mil (2.2mm) 6
150mil (3.8mm) 4