Alto D4, D3, D2, D1 Service Manual

M

O

3/

DEL: D1/D2/D

D4

CONTENT

1. INTRODUCTION……………………………………………………………………………..1

2. TECHNICAL SPECIFICATION……………………………………………………………..2

3. BLOCK DIAGRAM……………………………………………………………....................3

4. SCHEMATIC DIAGRAM…………………………………………………………………….5

5. WIRING DIAGRAM…………………………………………………………………………10

6. PCB LAYOUT……………………………………………………………………………….12

7. TEST PROCEDURE…………………………………………………………....................21

8. EXPLODED VIEW & MECHANICAL PARTS LIST……………………………………..27

9. BOM…………………………………………………………………………………………..36

1. INTRODUCTION

The D series includes D1, D2, D3, D4. It is a line of high power, low profile, professional Power Amplifiers withLTO advanced features and great reliability. They deliver tremendous power in only two rack spaces, providing high level performance under the most demanding conditions. An automatic speed fan matches cooling capacity with heat requirements. The amplifier frame contains all solid-state circuitry, using complementary silicon output devices. The amplifier is supplied with a single moulded AC cord having an appropriate AC plug for the intended operating voltage. The amplifier employs forced air cooling with a variable speed fan for minimum acoustic noise. Air flow is from rear to front to avoid temperature rise inside the Rack. D1, D3 contain two independent channels and D2, D4 contain four independent channels, with separate AC transformer secondaries, power supplies and protection system. All protection systems, except the main AC one, are self resetting upon removal of fault, and the remaining channel shall continue to operate. Each channel has independent protective circuitry against short circuit, over-loads and over temperature, and also has DC protection. Each channel has also LEDs for power-on, signal, clip and protection. Standard power connectors are used for . Input can be parallel or stereo or bridge and an high quality audio transformerpower outputs can be added on the input stage of each channel. It provides the following features:

2U rack, multi-channel high power amplifier

Fantastic audio quality even with extremely high volume levels

Solid and durable, can be mounted into a cabinet

Automatic limiter

Stereo (dual-channel), or bridge mono operating modes

Balanced XLR, 6.3 inputs / parallel outputs to ensure noiseless long wiring

Binding post and professional speak-on connectors for output

Stereo, bridge, and parallel output wiring possibility

Front panel LED indicators for power-on, signal, protection and clip

Accurate gain control

Independent DC, thermal, overload and short-circuit protection on each channel automatically protects amplifier

and speaker

Used together with line array cabinet in one audio system

Class D technology, switch power, light weight and high power

Manufactured under TS16949, ISO 14001 certified management system and RoHS directive

- 1 -

2. TECHNICAL SPECIFICATION

D1

Output power

2CH Amplifier

Power continuous @0.5% THD . Both channels driven, 230V

8ohms per channel(RMS)

4ohms per channel(RMS)

Power EIAJ@1% THD, both channels driven, 230V

8ohms per channel(EIAJ)

4ohms per channel(EIAJ)

BRIDGED MODE

16ohms (EIAJ)

8ohms (EIAJ)

Distortion(AMPTE-IM)

Frequency Response

Damping Factor, at 8 ohms

100Hz

2 X 240W

2 X 390W

2 X 270W

2 X 500W

1 X 520W

1 X 1000W

0.5%(THD, DIM, SMPTE)

20Hz-20kHz+/-0.1dB, -3dB points: 10Hz - 60kHz

300 at 8ohms

500

D2

4CH Amplifier

4 X 240W

4 X 390W

4 X 270W

4 X 500W

2 X 520W

2 X 1000W

D3

2CH Amplifier

2 X 340W

2 X 540W

2 X 370W

2 X 750W

1 X 740W

1 X 1500W

D4

4CH Amplifier

4 X 340W

4 X 540W

4 X 370W

4 X 750W

2 X 740W

2 X 1500W

1KHz

10KHz

Signal to Noise, 20Hz -20KHz

Voltage Gain

Input Sensitivity @ 4ohms

Input Clipping

Input Impedance

Controls

Indicators (1per channel)

Cooling

Load Protection

Power Requirements

Dimensions

200

100

105dB/A weighted

40 X (32dB)

1Vrms

10Vrms (+2 )2dB

10k ohms unbalanced, 20k ohms balanced 56(36dB)

Front: AC switch, gain knobs

Rear: low pass filter, mode selector

Power-on: blue

Operation/Protection: red

Clip: red

Continuously 7-variable-speed fan, rear- to - front air flow

On/off muting, DC-fault load grounding relay. Internal fault fuses

AC230V,AC115V, 50-60Hz

19"(483mm) rack mounting, 3.5"(88.8mm) tall (2 rack spaces)

11.2"(285mm) deep

14.8"(376mm) deep

11.2"(285mm) deep

14.8"(376mm) deep

Net Weight

5.50Kg

- 2 -

7.90Kg

5.50Kg

7.90Kg

3. BLOCK DIAGRAM

A

1 2 3 4 56

B

C

D

CH4 IN

CH3 IN

SIG IN

BRIDGED

PARA LLEL

STEREO

FAN

GND

SIN PROTCLIP

D4 FAN POWER

SW SLIDE-A

1

2

3

GND

CH2 VR

CH1 VR

DIGIMOD

CH2 SP

CH1 SP

BREAKER

M

AC SW

LED

A

B

C

AC IN

D

54321

6

- 3 -

A

1 2 3 4

B

CH4 IN

CH3 IN

C

CH2 IN

D

CH1 IN

SIG IN

BRIDGED

PARALLEL

STEREO

FAN

SW SLIDE-A

1

2

3

GND

SW SLIDE-A

GND

BRIDGED

3

PARALLEL

STEREO

1

2

CH4 VR

SIN PROTCLIP

CH3 VR

SIN PROTCLIP

DIGIMOD

CH2 VR

CH1 VR

DIGIMOD

321

CH2 SP

CH1 SP

BREAKER

M

AC SW

LED

A

B

C

AC IN

CH2 SP

CH1 SP

4

D

- 4 -

4. SCHEMATIC DIAGRAM

A

B

LA1117-L

C

LA1117-L

JK101

D

1 2

CH2

1

2

TSG3RJK201

GNDGND

GND

GND GND

33P

C202

R10

18K

47K

GND

CON3

GND

0.1uF

1uF

R208

R214

R215

CN201

C215

C214

4.7uF/50V

U2B

C207

123

100

5

10K

U4B

47UF

22k

10K

R206

6

4

2

6

NJM4580

7

R217

12K

5

NJM4580

7

R220

68R

R221

GND

R203

10K

3

NJM4580

U2A

10K

C213

1uF

R207

15K

R218

6

33P

C220

NJM4580

U5C

4 8

U4C

NJM4580

84

NJM4580

U3C

84

NJM4580

U2C

22uF/50V

15K

NJM4580

U1C

123

2.54 3P

CN203

R212

33P

GND

84

C203

C218

C209

0.1uF

C210

0.1uF

22uF/50V

NJM4580

22k

10K

GND

+12V1

R210

GND

R211

8K2

C216

33P

3

2

U4A

C219

33P

1

R213

68R

C221

47UF

R216

C211

0.1uF

3 4

56

GND

C212

0.1uF

C204

-12V1

1

R6

HSWA-2/3P

C217

10K

2

10K

4.7uF/50V

C206

SW101B

15K

C201

33P

R9

10K

R201

C208

33pF

R202

R5

1K

R219

NJM4580

GND

NJM4580

GND

27K

1

CH1

1

2

33P

U1B

C107

10K

123

5

10K

U3A

47UF

22k

C102

R8

R106

100R

5

3

1

15K

6

NJM4580

7

R117

8K2

2

NJM4580

1

68R

R121

GND

R120

U1A

1uF

R104

3

C115

10K

R118

TSG3R

R102

3

NJM4580

C104

1

2

4.7uF/50V

10K

SW101A

HSWA-2/3P

18K

C106

R2

10K

R114

R115

GND

C101

33P

R7

10K

R101

2

33pF

C103

R103

43

R110

10K

GND

C110

33P

R111

12K

5

6

NJM4580

U3B

C112

33P

7

R113

68R

C113

47UF

R116

22k

R112

C111

33P

15k

5

GND

GND GND

CON3

CN101

GND

12

34

56

78

910

1112

1314

GND

1516

SW102

HSWL-3/16P

1

R4

27K

U5A

3

R3

5

33P

2

7

U5B

6

15K

C109

0.1uF

C105

1uF

R105

47K

4.7uF/50V

C1

R1

27K

R119

C114

33P

GND

D3 INPUT(1/1)

GND

CN-6P

6

A

B

CN1

12345

C

D

6

- 5 -

A

IC1-1C

LM4558

84

C1-5

1 2 34

GND

47UF

B

PROTECT4

+12VDC1

R2-5

10k

R2-6 10k

PROTECT3

+12VDC1

R2-1

10k

C

PROTECT2

+12VDC

R1-6

R2-2 10k

10k

R1-3 10k

+12VDC

GND1

R2-3

10k

5

IC2-3B

2

LM4558

GND

R1-7

3

IC2-3A

10k

LM4558

5

6

IC1-1B

LM4558

GND1

R2-7

10k

IC2-3C

84

6

LM4558

GND

D

PROTECT1

+12VDC

R1-1

10k

R1-2 10k

R1-4

10k

LM4558

3

2

IC1-1A

GND1

VR

CON3

VR

CON3

VR

CON3

47UF

123

C2-3

GND1

7

R2-8 10k

GND1

+12VDC1

LED2_2

RED

CON8

1234567

VR1

PROTECT4

CN2

8

PROTECT3

RED

1

R2-4 10k

GND

LED2_1

RED

CON8

7

R1-8 10k

LED1_2

1234567

GND

RED

CN1

8

+12VDC1

+12VDC

PROTECT1

PROTECT2

1

R1-5 10k

LED1_1

+12VDC

CN3

C2-1

4148

GND1

GRN

100k

10UF

C1_2

C1-1

10UF

GND

R2-9

C1815

Q2-2

10k

2.2k

Q2-3

820K

4148

GND

D1-3

5k

Q1-7

C1815

R2-13

1k

R2-17

R2-23

LED2_3

RED

R1-11

100k

GND

R1-21

GRN

C1815

R1-23

2.2k

LED1_4

R1-9

820k

Q1-1

R1-13

1k

R1-17

10k

Q1-2

C1815

LED1_3

RED

R2-11

D2-1

LED2_4

10UF

C2-2

GND1

VR2

R2-18

GND1

5k

C1815

Q2-1

CN4

VR3

CN5

VR

CON3

123

R1-14

VR4

R2-14

2.2k

R2-19

2.2k

R1-18

2.2k

321

CN6

10UF/25V

C1-3

C1-4

R1-12

D1-4

Q1-4

C1815

10k

100k

4148

GND

R1-22

R1-10

820K

R1-15

1k

R1-19

R1-24

Q1-5

2.2k

Q1-8

GRN

C1815

LED1_5

LED1_6

RED

GND1

10UF

GND1

5k

C1815

C2

Q2-7

R2-21

GND1

GRN

100k

4148

10UF25V

C1

GND

R2-10

C1815

820K

Q2-5

R2-15

1k

R2-20

10k

R2-24

2.2k

Q2-6

C1815

LED2_5

RED

GND

10UF/25V

5k

C1815

R2-12

D2-3

LED2_6

4

R2-16

2.2k

R2-22

2.2k

R1-20

R1-25

2.2K

A

B

C

D

A

B

C

D

1

V+

G

2

LED

DL1

DL2

DL3

1

DL

LED

34

32

4

D3-LED(1/1)

A

B

C

D

- 7 -

A

B

C

D

1

CN1

2 34

HC2PH

1

2

CN2

HC2PH

2

-1

+--+

-2

-1

+--+

-2

+1

XL1

+1

XL2

+2

XL-4P

+2

XL-4P

1

32

D4 OUTPUT(1/1)

4

A

B

C

D

- 8 -

A

1

2 34

B

P2

PC250

2

1

2P3

5

6

2

1

12V

(1.5A 200V)

C

PC250

2P1

1

8

7

PT1

3

4

D3

D

1

1K8

150R

R5

47K

470uF/35V

C1

2

R4

IN

1

R3

NTC500R

R1

R2

NTC 500R

10uF/63

G

C3

+12V

LM317T

IN

OUT

G

OUT

100nF/50 cer

C2

D4

5.6V

U1

C4

10UF

32

A

1N4004

D1

K

FAN

A

B

CN4

2P2.5

1

2

C

CN-2P-180

CN3

1

2

D

D4 FAN POWER(1/1)

4

- 9 -

5. WIRING DIAGRAM

D

4

C

B

A

CON6

321

CH4

DIGIMOD LED OUT

CON7

CH3

CON8

DJMOD

FAN

CN1

OUTPCB

P

AC SW

P1

1 2 34

AC

BREAKER

FAN POWER

NPUT

D1/D3

D

C

- 10 -

B

A

1 2 3 4

B

C

NPUT

AC

D

FAN POWER

P1

P3

CH4

CN1

CON6

BREAKER

OUTPCB

DIGIMOD DIGIMOD

AC SW

CH3

DIGIMOD LED OUT

CON7

FAN

CON8

321

CN1

CH2

CN6

DIGIMOD LED OUT

CN8

CH7

4

D2/D4

A

B

C

D

- 11 -

6. PCB LAYOUT

PCB: DGMMAIN19 BOTTOM LAYER

BOTTOM SOLDER

PCB: DGMMAIN19 TOP LAYER

TOP OVERLAY

TOP SOLDER

- 12 -

N

7

N

7

GMC

N

7

N

R

N

R

TRL1

GND

GMC

TRL1

VCC

DGMC

TRL17

DGMC

TRL17

BOTTO

M LAYER BOTTO

M

SOL DE

TOPM

LAYER

TOP

OVERL

AY

TOP

SOL DE

- 13 -