Alto OEX-400 User manual

Service Manual

www.altoproaudio.com

Version: 1.2

Model: OEX-400

CONTENT

1. Introduction.............................................................................................1

2. Specification............................................................................................2

3. Block Diagram.........................................................................................4

4. Schematic Diagram.................................................................................5

5. Wiring Diagram......................................................................................10

6. Printed Circuit Board..........................................................................11

7. Exploded View & Mechanical Parts List..................................................14

8. Electrical Parts List.............................................................................19

1. Introduction

Trolley appearance

2 (two-SPEAKER) + 1 (7-channel mixer super combination)

One-way full-range speaker system

4 XLR MIC input with ultra low noise microphone pre-amplifiers and PHANTOM power+48V

1 stereo LINE input

Warm, natural 2-band EQ for each channel

Precision level control

24-bit DSP effects with powerful algorithms (16 presets)

Extremely high headroom offering excellent dynamic range

Plastic reinforced cabinet (polypropilene)

Two 10m speaker cables

Two folding speaker

Compartment for store following accessories:

350W (EIAJ) of Power

Folding speaker 2 10"

Power cord 1 IEC power cord

Customized Speaker Cable 2 10m

MIC 2 5m

Accessory List:

- 1 -

Mixer Section

2.Technical Specification

- 2 -

Speaker Section

Physical

Power Section

- 3 -

1234567 8

2-STAGE EQ

LOW HI

LEFT(MONO)

RIGHT

MIAN-BUS

DFX(DSP)

2-STAGE EQ

CH INPUT

(CH1~3)

TAPE INTAPE OUT

PRESETS

MUTE

DSP FOOT

MAIN-BUS

DSP BOARD

7-STAGE EQ

63HZ

160HZ

400HZ

2.5K

6.3K

16K

MAIN LEVEL

MASTER METER

MONITOR METER

MONITOR LEVEL

MONITOR OUT

PHONES OUT

LEVEL

DSP/FX AUX1 POST

X1-3A

XLR&TRS

X1-3B

XLR&TRS

XLR

LOW HI

LEVEL

DSP/FX AUX1 POST

2-STAGE EQ

LOW HI

LEVEL

DSP/FX AUX1 POST

BAL/UNBAL

CH INPUT

CH4/5

BAL/UNBAL

CH6/7

STEREO INPUT

STEREO UNBAL INPUT

AUX RETURN LEVEL

DFX(DSP)

LOW BOOST 1

J13

CON4

POWER MODEII

RMS 300W

X14

MASTER SPK OUT2

STEREO OUTPUT

AUX RETURN

FOOTSWITCH

FX SEND

X13

MASTER SPK OUT1

POWER_CONNECT POWER SUPPLY

+22V

-22V OEX-400_MIXER

+15V

+5V

-15V

- 4 -

3. Block Diagram

12345678

87654321

MAIN SECTION

OEX-400_2.SCH DSP SECTION

OEX-400_3.SCH 7 BAND EQ

OEX-400_4.SCH

EQ HI

10KHZ

47u/25V

U2A

4580M

R124

C100

22P

3K9

R101

8K2

R100

8K2 C87

4N7(M) R102

8K2

C82

4N7(M)

47u/25V

100HZ

47u/25V

R50

10K

3K9

47u/25V C64

22P

3K9

R51 10K

C65 22P

47u/25V

U1A

4580M

X1A

XLR&TRS

X1B

XLR&TRS

47u/25V

R19

22K

47u/25V

R20

22K

CON10

C13

47u/25V R6

3K9

C15

47u/25V R7

3K9

X2A

XLR&TRS

X2B

XLR&TRS

C11

47u/25V

R23

22K

C12

47u/25V

R24

22K

C14

47u/25V R8

3K9

C27

47u/25V R12

3K9

X3A

XLR&TRS

X3B

XLR&TRS

C25

47u/25V

R27

22K

C26

47u/25V

R28

22K

CH1-

CH1+

CH2-

CH2+

CH1 XLR INPUT

CH1 TRS INPUT

CH2 XLR INPUT

CH2 TRS INPUT

CH3 XLR INPUT

CH3 TRS INPUT

R52

10K

R91

12K C66

22P

U1B

4580M

47u/25V

R21

22K

U2B

4580M

R132

36K

C102

22P

C10

47u/25V

R22

22K

R103

8K2

47u/25V

VR1

B50K

VR2

B50K

3K9

1 3

2VR3

W50K

J1 PRE/POST

R92

20K

1 3

2VR4

W50K

R53

10K

MAIN-BUS

FX-SEND

EQ HI

10KHZ

C19

47u/25V

U4A

4580M

R125

C101

22P

3K9

R105

8K2

R104

8K2 C88

4N7(M) R106

8K2

C83

4N7(M)

C21

47u/25V

100HZ

R54

10K

C67

22P

R55 10K

C68 22P

C16

47u/25V

U3A

4580M

R57

10K

R93

12K C70

22P

U3B

4580M

C18

47u/25V

R25

22K

U4B

4580M

R133

36K

C104

22P

C24

47u/25V

R26

22K

R107

8K2

C22

47u/25V

VR5

B50K

VR6

B50K

3K9

1 3

2VR7

W50K

J2 PRE/POST

R95

20K

1 3

2VR8

W50K

R59

10K

MAIN-BUS

FX-SEND

EQ HI

10KHZ

C20

47u/25V

U6A

4580M

R126

C103

22P

R11

3K9

R110

8K2

R109

8K2 C89

4N7(M) R111

8K2

C84

4N7(M)

C29

47u/25V

100HZ

R61

10K

C72

22P

R56 10K

C69

22P

C17

47u/25V

U5A

4580M

R58

10K

R94

12K C71

22P

U5B

4580M

C28

47u/25V

R29

22K

U6B

4580M

R134

36K

C105

22P

C30

47u/25V

R30

22K

R108

8K2

C23

47u/25V

VR9

B50K

VR10

B50K

R10

3K9

1 3

2VR11

W50K

J3 PRE/POST

R96

20K

1 3

2VR12

W50K

R60

10K

MAIN-BUS

FX-SEND

+VCC3

-VCC3

SCJ-0658-1-Y

CON12

SCJ-0658-1-Y

RAUX RETURN

FX SEND

FOOTSW

C31

47u/25V

C193

100PC192

100P

C32

47u/25V

R154

120R

8 4

U3C

4580M

8 4

U4C

4580M

8 4

U5C

4580M

8 4

U6C

4580M

8 4

U1C

4580M

8 4

U2C

4580M

C120

0.1u

C126

0.1u

C121

0.1u

C127

0.1u

C122

0.1u

C123

0.1u

C124

0.1u

C125

0.1u

C128

0.1u

C129

0.1u

C130

0.1u

C131

0.1u

+VCC1

-VCC1

+VCC2

-VCC2

+VCC3

-VCC3

R138

R141

R140

R142

R143

R139

+VCC

-VCC

+VCC

-VCC

MOINTOR OUT

HEADPHONE OUT

CON12

HP-OUT-R

HP-OUT-L

MO-OUT-R

MO-OUT-L

AUX-RETURN-L

AUX-RETURN-R

EFFECT-IN

FOOTSW

POWER&DSP

OEX-400_5.SCH

C94

4.7u/50V

C93

4.7u/50V

C92

4.7u/50V

C33

4.7u/63V NP

+VCC2

-VCC2

SW SL2020 R252

22K

R163

22K

C146

47u/25V

J17

CON2

1 2

3 4

5 6

7 8

9 10

11 12

13 14

15 16

17 18

19 20

21 22

23 24

25 26

CN500

HEADER 13X2

R500

33R 5W

R501

47R 5W

CN501

CON3

+30VCC

-30VCC

+22VCC

-22VCC

CN501 connect to J14(SCH5)

CN500 connect to POWERMODEII

- 5 -

4. Schematic Diagram

12345678

87654321

EQ HI

10KHZ

C35

47u/25V

U9A

4580M

R127

C106

22P

R14

3K9

R113

8K2

R112

8K2 C90

4N7(M) R114

8K2

C85

4N7(M)

C36

47u/25V

100HZ

R97

12K C73

22P

U8B

4580M

C34

47u/25V

R31

22K

U9B

4580M

R135

36K

C107

22P

C39

47u/25V

R32

22K

R115

8K2

C37

47u/25V

R13

3K9

J4 PRE/POST

R63

10K

VR13

B50K

VR14

B50K

1 3

2VR15

W50K

R62

10K

1 3

VR16

W50K

R98

20K

FX-SEND

EQ HI

10KHZ

C46

47u/25V

U11A

4580M

R128

C111

22P

R18

3K9

R118

8K2

R117

8K2 C91

4N7(M) R119

8K2

C86

4N7(M)

C47

47u/25V

100HZ

R164

12K C74

22P

U10A

4580M

C45

47u/25V

R33

22K

U11B

4580M

R136

36K

C108

22P

C48

47u/25V

R34

22K

R116

8K2

C38

47u/25V

R17

3K9

J5 PRE/POST

R70

10K

MAIN-IN-EQ

TAPE-IN

VR17

B50K

VR18

B50K

1 3

2VR19

W50K

R69

10K

1 3

2VR20

W50K

R99

20K

FX-SEND

8 4

U7C

4580M

8 4

U8C

4580M

8 4

U9C

4580M

8 4

U10C

4580M

C132

0.1u

C133

0.1u C135

0.1u

C134

0.1u C136

0.1u C138

0.1u

C137

0.1u C139

0.1u

+VCC4

-VCC4

8 4

U13C

4580M

C144

0.1u

C145

0.1u

+VCC5

-VCC5

8 4

U11C

4580M

C140

0.1u

C141

0.1u

R144

R145

R146

R147

+VCC

-VCC

+VCC

-VCC

U12A

4580M

R161

62K

C109 22P

C40

47u/25V

R71

10K

U14B

4580M

R36

22K

C110

22P

EFFECT-IN

U12B

4580M

R72

10K

C113 22P

C49

47u/25V

MAIN-BUS

U13A

4580M

R165

2K2

C112

22P

DSP-IN

8 4

U12C

4580M

C142

0.1u

C143

0.1u

R65

18K

R64

10K C41

47u/25V

X13

SCJ-0658-1-Y

X14

SCJ-0658-1-Y

J12

CON4

C95

4.7u/50V

C96

4.7u/50V

X15

SCJ-0658-1-Y

C194

100P C195

100P

X12

UNBAL-4P

LCH IN

RCH IN

C53

47u/25V R74

22K

C54

47u/25V R75

22K

TAPE INTAPE OUT

R170 2.2K

R171 2.2K

TAPE IN

TAPE OUT

CH4/5-IN

TAPE-IN

TAPE-OUT

R35

22K

R168

10k

R73

10K

C196

1N5

U13B

4580M

R162

10K

C114

22P

XLR-M

X10

SCJ-0658-1-Y

X11

SCJ-0658-1-Y

C43

47u/25V R15

3K9

C42

47u/25V R16

3K9

C44

47u/25V

R37

22K

C50

47u/25V R38

22K

C52

47u/25V

R39

22K

C51

47u/25V R40

22K

J11

CON12

J10

CON12

R67

10K

C78

22P

R66

10K

C75

22P

U8A

4580M

R78

10K

C79

22P

R76

10K

C76

22P

U7A

4580M

R81

10K

C80

22P

R77

10K

C77

22P

U7B

4580M

R68

10K

R80

20K

R79

20K

C97

47u/25V

C99

47u/25V

C98

47u/25V

CH4/5-IN

OUT1

OUT2

AMP MO OUT----NC

1U14A

4580M

+VCC1

-VCC1

- 6 -

12345678

87654321

U23A

4580M

R41

22K

C115 22P

R176

6K8

R42

22K 3

U16A

4580M

R173

5K6

C116

22P C55

47u/25V

R184

680R

R172

5K6

21U15A

4580M

R177

39K

C197

10P

MN-EQ-SOURCE

67U15B

4580M

R178

39K

C198

10P

R175

6K8

MN-EQ-OOL-2

MN-EQ-OOL-1

R120

8K2

R189

2K7 5

U16B

4580M

R43

22K

C117

22P

C56

47u/25V R44

22K

HP-OUT-L

HP-OUT-R

MO-OUT-L

MO-OUT-R

TAPE-OUT

R207

27K 3

U17A

4580M

C58

47u/25V R213

8K2

R137

36K

C81

22P

C59

47u/25V

R45

22K

U19A

BA15218N

U19B

BA15218N

C119

22P

R216

10K0

R159

120R

R160

120R

R158

120R

R157

120R

U17B

4580M

C61

47u/25V

R46

22K

U18A

BA15218N

U18B

BA15218N

R217

10K0

C118

22P

1 3

2VR22

W50K R214

100R 1/4W

R215

100R 1/4W

MONITOR OUT

MASTER(VOLUMES)

C57

47u/25V R200

100K

D20

4148

U20A

4580M

R199

100K

D16

RED

D14

D11

D10

+10DB0DB-10DB-30DB

MN VMETER

8 4

U14C

4580M

8 4

U15C

4580M

8 4

U16C

4580M

8 4

U17C

4580M

C166

0.1u

C167

0.1u C169

0.1u

C168

0.1u C170

0.1u C172

0.1u

C171

0.1u C173

0.1u

8 4

U18C

4580M

C174

0.1u

C175

0.1u

R150

R151

+VCC

-VCC

8 4

U20C

4580M

C152

0.1u

C153

0.1u

+VCC6

-VCC6

R148

R149

+VCC

-VCC

8 4

U19C

4580M

C164

0.1u

C165

0.1u

1 3

VR21

W50K

MAIN-IN-EQ

J13

CON4

TO AMP IN

3 12

U21A

LM339

U21B

LM339

814

U21C

LM339

10 13

U21D

LM339

3 12

U22A

LM339

U22B

LM339

U22C

LM339

U22D

LM339

R84

10K

2C3

PNP

2C3

PNP

R156

120R

1N4148

R155

120R

R192

470R

1N4148

R191

470R

R82

10K

D17

RED

D15

D13

D12

R194

43R

R195

510R

R196

1.2K

R197

2.7K

R198

22K

D19

4148

C60

47u/25V

R201

100K

D21

4148

U20B

4580M

R202

100K

R83

10K

D22

4148

+VCC6

-VCC6

+VCC6

-VCC6

MO VMETER

+10DB0DB-10DB-30DB

+VCC6

-VCC6+VCC6

-VCC6

R247

10K

C190

47UF/25V

C191

47UF/25V

C188

47UF/25V

C189

47UF/25V

R248

R249

10K NC

+VCC1

-VCC1

+VCC8

-VCC8

R253

4.7K

R254

4.7K

R262

15.0K

U10B

4580M

R264

27.0K

C238

100nF

R265

12.0K

C237

0.22u/50V

CI00185

C239

47u/25V

R255

27K

R255 IS NOT USED

- 7 -

12345678

87654321

U23B

4580V

R218

18K

C199

220N

R225

15K

C200

220N

MN-EQ-OOL-2

MN-EQ-OOL-1

63HZ FREQUENCY BAND

MN-EQ-SOURCE

VR24A

W100K R226

15K R227

15K

R174

5K6

U24A

4580V

R221

18K

C201

220N

R121

8K2

C202

220N

MN-EQ-OOL-2

MN-EQ-OOL-1

160HZ FREQUENCY BAND

MN-EQ-SOURCE

VR25A

W100K R122

8K2 R123

8K2

R232

1K2

U24B

4580V

R223

18K

C213

33N

R179

39K

C212

33N

MN-EQ-OOL-2

MN-EQ-OOL-1

400HZ FREQUENCY BAND

MN-EQ-SOURCE

VR26A

W100K R180

39K R181

39K

R234

1K8

U25A

4580V

R219

18K

C204

10N

R229

47K

C205

10N

MN-EQ-OOL-2

MN-EQ-OOL-1

1KHZ FREQUENCY BAND

MN-EQ-SOURCE

VR27A

W100K R230

47K R231

47K

R190

2K7

U25B

4580V

R222

18K

C206

10N

R47

22K

C207

10N

MN-EQ-OOL-2

MN-EQ-OOL-1

2.5KHZ FREQUENCY BAND

MN-EQ-SOURCE

VR28A

W100K R48

22K R49

22K

R233

U26A

4580V

R224

18K

C211

R203

100K

C210

MN-EQ-OOL-2

MN-EQ-OOL-1

6.3KHZ FREQUENCY BAND

MN-EQ-SOURCE

VR29A

W100K R204

100K R205

100K

R235

3K3

U26B

4580V

R220

18K

C208

R208

27K

C209

MN-EQ-OOL-2

MN-EQ-OOL-1

16KHZ FREQUENCY BAND

MN-EQ-SOURCE

VR30A

W100K R209

27K R210

27K

R166

2K2

8 4

U23C

4580V

8 4

U24C

4580V

8 4

U25C

4580V

8 4

U26C

4580V

C176

0.1u

C180

0.1u C181

0.1u

C177

0.1u C178

0.1u C179

0.1u

C182

0.1u C183

0.1u

+VCC8

-VCC8

R152

R153

+VCC

-VCC

VR24B

W100K

VR25B

W100K

VR26B

W100K

VR29B

W100K

VR28B

W100K

VR27B

W100K

VR30B

W100K

R263

0R 1/4W

- 8 -

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