Alto A400.4 Dragonfly User manual

www.altoproaudio.com

Version 1.0

MODEL: A400.4

CONTENT

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

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

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

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

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

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

7. Exploded View & Mechanical Parts List..................................................13

8. Electrical Parts List.............................................................................15

1. Introduction

˙1.5U 1/2 rack, multi-channel high power amplifier.

˙Fantastic audio quality even with extremely high volume levels.

˙Solid and durable, can be mounted into a cabinet.

˙User-controllable clip limiter.

˙4×120Watts on 4 ohms (EIAJ)

˙Balanced XLR inputs and 1/4” TRS jack to ensure noiseless long wiring.

˙1/4”TS jack for sp-output.

˙Front panel LED indicators for signal, limit and clip.

˙Accurate gain control

˙Independent thermal overload protection on each channel automatically

protects amplifier and speakers.

˙Single channel over-heat protection.

- 1 -

2. Specification

8 ohms per channel(EIAJ)

4 ohms per channel(EIAJ)

4 ohms per channel(RMS)

A400.4 DRAGONFLY

20Hz [email protected]%THD, Stereo Mode

MODEL

Controls FRONT: Power switch, LEVEL knobs

REAR: Four LIMITER Switches for channel 1- channel 4

Indicators (per channel)

Power-On: Green LED

Clip: Red LED

Limit: Yellow LED

Signal: Green LED

Connectors of each channel Input: COMBO connector

Output: 1/4" TS jack connector

Power Supply 190-240 Vac~50Hz / 95-120Vac~60Hz

Dimension

Net Weight

65W

120W

(at THD:1%)

3.8Kg

314mm x 208.5mm x 66.6mm

Input Sensitivity @4 ohms +3dBu

62W+3W

- 2 -

1 2 34

321

CH1

CH2

CH3

CH4

PRE-AMP

D100W

AMP

D100W

AMP

PM8PWR

POWER SUPPLY

A400.4

BLOCK DIAGRAM

- 3 -

3. Block Diagram

1 2 34

321

CN11

CON2

CN12

CON2

CN13

CON2

CN14

CON2

CN15

CON2

CN16

CON2

CN17

CON2

CN18

CON2

CH1_SP+

CH1_SP-

CH2_SP+

CH2_SP-

CH3_SP+

CH3_SP-

CH4_SP+

CH4_SP-

CN1

CN-BAL-COMBI

CN2

CN-BAL-COMBI

CN3

CN-BAL-COMBI

CN4

CN-BAL-COMBI

CN5

CON3

CN6

CON3

CN7

CON3

CN8

CON3

CN9

CON4

CN10

CON4

SW1A

SW PS-22E85L

SW1B

SW PS-22E85L

SW2A

SW PS-22E85L

SW2B

SW PS-22E85L

SW3A

SW PS-22E85L

SW3B

SW PS-22E85L

SW4A

SW PS-22E85L

SW4B

SW PS-22E85L

CH1

CH2

CH3

CH4

PJ1

PHONEJACK5 (5-PIN)

PJ2

PHONEJACK5 (5-PIN)

PJ3

PHONEJACK5 (5-PIN)

PJ4

PHONEJACK5 (5-PIN)

100P

100P C4

100P

100P C6

100P

100P C10

100P

C11

100P C12

100P

TP1

TP-2

- 4 -

4. Schematic Diagram

12345678

7654321

C11

56pF/50 cer

10K

GND

CH1 GAIN

100pF/50 cer

47uF/25V

100pF/50 cer

22uF/50V

GND

22uF/50V

U1A

NJM4580L

U1B

NJM4580L

GND R9

10K

GND

15K

10K

15K

CN1

CON3

GND

CH1-IN

17K4

2 3

VTL

C12

56pF/50 cer

R12

10K

GND

CH2 GAIN

100pF/50 cer

C10

47uF/25V

100pF/50 cer

22uF/50V

GND

22uF/50V

U3A

NJM4580L

U3B

NJM4580L

GND R13

10K

GND

15K

10K

R11

10K

R10

15K

CN2

CON3

GND

CH2-IN

R14

17K4

2 3

VTL

U3C

NJM4580L

U1C

NJM4580L

U5C

NJM4580L

U5A

NJM4580L

U5B

NJM4580L

C13

56pF/50 cer

C14

56pF/50 cer

C15

104P

C16

104P

C17

104P

C18

104P

C19

104P

C20

104P

R25

10K

R26

82K

R27

10K

R29

82K

R28

10K

R30

10K

GND

CN4

CON3

GND

+15V

-15V

CN6

CON3

CH2-OUT

CH1-OUT

C30

56pF/50 cer

R35

10K

GND

CH3 GAIN

C28

100pF/50 cer

C29

47uF/25V

C27

100pF/50 cer

C24

22uF/50V

GND

C23

22uF/50V

U6A

NJM4580L

U6B

NJM4580L

GND R39

10K

GND

R31

15K

R34

10K

R33

10K

R32

15K

CN9

CON3

GND

CH3-IN

R36

17K4

2 3

VTL

C34

56pF/50 cer

R42

10K

GND

CH4 GAIN

C33

100pF/50 cer

C44

47uF/25V

C32

100pF/50 cer

C26

22uF/50V

GND

C25

22uF/50V

U8A

NJM4580L

U8B

NJM4580L

GND R43

10K

GND

R37

15K

R38

10K

R41

10K

R40

15K

CN10

CON3

GND

CH4-IN

R44

17K4

2 3

VTL

U10A

NJM4580L

U10B

NJM4580L

C31

56pF/50 cer

C35

56pF/50 cer

R55

10K

R56

82K

R57

10K

R59

82K

R58

10K

R60

10K

GND

CN12

CON3

GND CH4-OUT

CH3-OUT

U8C

NJM4580L

U6C

NJM4580L

U10C

NJM4580L

C36

104P

C37

104P

C38

104P

C39

104P

C40

104P

C41

104P

GND

C42

220u/25V

C43

220u/25V

R21

82R

CLIP

SIG

LIMITER

R22

30R

R19

180R

VR1

A10K

CN3

CON4

R24

82R

CLIP

SIG

LIMITER

R23

30R

R20

180R

VR2

A10K

CN8

CON5

CN5

CON5

R15

270R

R17

270R

R51

82R

R52

30R

R49

180R

VR3

A10K

CN7

CON4

R54

82R

R53

30R

R50

180R

VR4

A10K

CN13

CON5

CN11

CON5

R45

270R

R47

270R

CLIP

SIG

LIMITER

CLIP

SIG

LIMITER

GND

- 5 -

1 2 34

321

LED1

RED

LED3

LED2

YEL

CN1

CON5

LED4

RED

LED6

LED5

YEL

CN2

CON5

- 6 -

12345678

7654321

IC4

7815

IC2

7915

C16

100N

C14

100N

C25

100N

C12

470N

C13

470N

180U/25V

C30

100U/25V

C26

100U/25V

C21

2200U/25V

C20

2200U/25V

C24

2200U/25V

C23

2200U/25V

C22

2200U/25V

C19

2200U/25V L5

1uH/12A

KBU8M C7

470U/200V

C36

470U/200V C37

470U/200V

2N2/400V C3

2N2/400V

C38

2N2/400V C39

2N2/400V

1uH/12A

R13

150K

R14

150K

14D391K

NTC_B57237

CX2

1u/275V

845K

845K R3

150K

CON10

CON4

BC640

6R80

BZT03-C16

BYV27-150

100N

IC1

L7812CV

330U/25V C6

100U/25V

A2A1

BT139

STW9NK90Z

D12A

30CPQ150

D12B

30CPQ150

D9B

30CPQ150

D9A

30CPQ150

PE67100

TL25-050-182

R11

75R0

R12

150R

270R

R10

2K2

1N4148

L4A

LF20_13EED

911

L4B

LF20_13EED

12 10

L4C

LF20_13EED

1315 L4D

LF20_13EED

16 14

L4E

LF20_13EED

TF20_13EED

CON2

V27NY

V27N

V27NY

V27N

GND

V15A

V15N

V27NFB

C10

470P/500V

C11

470P/500V

C41

100N

10R/30W

GND

CON8

GND

V27N

V27NF

V15N

V15A

GND

V27NF

CON2

R15

1R8

AC_INPUT

AC_SEL

PMPWRCTL_BOARD

GND 1

CN4

CON3

V27N

V27NF R20

12R/10W

R21

12R/10W

C47

180U/25V

C48

100N

1N4007

C49

100N

CX1

0.47u

TL25-050-182

CY1

222P

CY2

222P

10K

ADD R0 20060120

- 7 -

12345678

7654321

C20

10U/16V

C22

10U/16V

C23

2200U/35V

C24

2200U/35V

R27

5K60

R26

5K60

C28

560P IN1-

IN1+

SGND1

OSC

MODE

IN2-

IN2+

SGND2

FB1 20

SW1 24

REL1 23

ENA1 21

DIACUR 22

DIATEMP 15

STABEX 18

STABINT 19

ENA2 16

REL2 14

SW2 13

FB2 17

VDD1 3

VDD2 10

VSS1

1VSS2

TDA8929

C31

0.1uF/100V

GND

MUTE

+25C

-25C

R28 1K0

C48

220N

-25C C59

C49

220N

SW2

REL2

ENA2

VSTAB

POWUP

DIAG

ENA1

REL1

SW1

BOOT2 12

OUT2 11

BOOT1 6

OUT1 7

VSS1

8VSS2

VDD1 5

VDD2 13

TDA8927

-25

+25

C40

22N

C41

22N

C29

560P

C32

560P

C30

560P

C33

560P

C151

2N7 COG C18

470N MKT

C152

2N7 COG C21

470N MKT

C50

0.01uF

C61

470N

C62

1N(NPO) C110

10N(NPO)

C105

100U/35V LOW ESR

C106

100U/35V LOW ESR

R39

5R60 R40

5R60

R41

5R60 R42

5R60

R63

100R

R64

100R

R65

47R 1/4W

R66

47R 1/4W

TWKC-22UH

L10

TWKC-22UH

L11

TWKC-22UH

+25 -25

GND GND

GND GND GNDGND CASE

TE6

GND

+25C

-25C

470N

0.1uF/100V

470N

C45

220N

C46

NOT USE

C47

220N

GND

+25

-25

C60

470N

C55

0.1uF/100V

TE7

220N

NOT USE

C10

220N

-25

R31

27K

C34

220N

-25C

56K

ZD5.6

+25C

GND

MUTE

+25

-25

ferrite bead

TE1

C16

0.1uF/100V

-25C

GND

0.1uF/100V

TE3

+VCC

TE4

GND

TE5

-VCC

C56

0.01uF C64

1N(NPO)

C111

10N(NPO)

R68

47R 1/4W

R70

47R 1/4W

GND

CASE

C14

10U/16V

C15

10U/16V

5K60

560P

GND

TE2

CN1

CON3

ferrite bead

0.1uF50V

TE8

C13

10N(NPO)

- 8 -

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