Alto DI1 Schematic

Service Manual

Model: DI1

DIRECT INJECT BOX

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

1. SPECIFICATIONS (DI1)

Inputs 1/4” jack unbal. In/ Link Out

XLR unbalanced In

Input Impedance max 220 kOhm
Maximum Input level +2/+22/+42 dBm

Output XLR balanced Out
Load Impedance >600 Ohm
Maximum Output Level +6 dBm

System specifications

Bandwidth(100kOhm) 10Hz to 200Khz(±3dbm)
Bandwidth(600Ohm) 10Hz to 45Khz(±3dbm)
Bandwidth(High Cut) 10Hz to 8Khz(±3dbm)

Noise Level -105 dBm
THD+N @ 1 kHz / 1 dBm < 0.01 %

Power supply

Phantom power 18 V DC to 48 V DC
Battery 9 V blockcell 6LR91

Dimensions 128 mm x 123.5 mm x 44.2 mm
Weight ca. 0.8Kg

D

2.Block Diagram

C

B

A

V1.0

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Sheet

IC1

PHANTOM POWER

STEP-DOWN CONVERTER

LED1

LED CONTROL

SW4

PHASE

SW1

8KHz HIGH CUT

SW5

GND LIFT

DI1

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DI1 DIGRAM.Sch

DI1 BLOCK DIGRAM

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SW3

-20dB ATTENUATION

SW2

-20dB ATTENUATION

213

4

INPUT

D

CN2

XLMN-3PH

3c5e1a4d2b

C

INPUT

CN3

CN-JY6351G-02

3c5e1a4d2b

SW6

BATTERY +9V

LINK

BATTERY POWER

CN4

CN-JY6351G-02

B

1 2 3 4

A

D

3. Schematic Diagram

C

B

A

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Q1

BR

C8

470/16V

D7

D4

4148

4148

D3

FM103

7

6

84

D2

CN2

47R

R17

47K

2

GND2

R13

1

R14

3

16K

100K

R19

IC1A

16K

2068

C3

100u/25v

R12

100K

R11

1M

C2

100u/25v

GND2 GND2

GND2

R18

4321

GR

LED1

D1

R4

4K7

4148

C5

100n

R5

24K

R15

47K

+VCC

47K

C4

100n

R16

120K

R3

5

IC1C

2068

FM103

DC +9V

IC1B

C7

100u/25v

D6

R20

2068

D5

4148

4148

47R

R21

33R

C6

153 (M)

C10

470uF

ZD1

11V

SW3

R2

47R

R1

GND2

470K

R7

470K

SW1

PS-22E85L

(8KHZ HIGH CUT)

456

1

C9

100n

CN1

10
9
8
7
6
5
4
3
2
1

GND2 GND2 GND2

10P-2.0

PS-22E85L

R8

51K

SW2

( -20dB ) ( -20dB )

PS-22E85L

R6

51K

GND2 GND2 GND2

C1

0.47/50V

3

2

SW5

PS-22E85L

SW6

DC-POWER

( GND LIFT )

GND2

SW4

PS-22E85L

(PHASE)

GND2 GND2 GND2 GND2 GND2

1 2 3 4

D

C

B

A

D

C

B

A

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CN5

XLR-3MALE

OUTPUT

TR1

15V

D2

BR

100u/25v

820R

C6

R4

51K

TR2

BR

C4

R5

820R

1n

C7

4K7

R7

R6

100n

CN1

10
9
8
7
6
5
4
3
2
1

10P2.0

213

4

GND2

T1

L2

220H

2

OTS-1030

1

4

3

R9

213

5

4

22K(omit)

GND2 GND2 GND2

CN2

XLMN-3PH

3c5e1a4d2b

GND1

CN3

CN-JY6351G-02

D1

1

3c5e1a4d2b

SFS1B-T

IC1

R3

1R

R8

1R

C5

T2

C3

MC34063A/E

C2

100P

GND2 GND2

CN4

CN-JY6351G-02

470P

100uF

LINK

C8

GND2

104P

GND1 GND1 GND1

C1

470uF

GND1GND1

R10

27R

R2

3K32

R1

1K18

INPUT

D

INPUT

C

LINK

1 2 3 4

B

A

4.Printed Circuit Diagram

DI1FP PCB LAYOUT

PCB : DI1FP Top Layer

PCB : DI1FP Top Solder Mask

PCB : DI1FP Top Overlay

PCB : DI1FP Bottom Layer

PCB : DI1FP Bottom Solder Mask

PCB : DI1FP Bottom Overlay

PCB : DI1FP Drill Drawing Plots

Hole Size Hole Count
24mil (0.6mm) 46

31mil (0.8mm) 54
35mil (0.9mm) 10
39mil (1.0mm) 2
138mil (3.5mm) 4

Totals 116

DI1PU PCB LAYOUT

PCB : DI1PU Top Layer PCB : DI1PU Bottom Layer

PCB : DI1PU Top Solder Mask PCB : DI1PU Bottom Solder Mask

PCB : DI1PU Top Overlay PCB : DI1PU Bottom Overlay