Alto Comp Schematic

Service Manual

Model: ▲LTOCOMP

DIGITAL COMPRESSOR/LIMITER

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. SPECIFICATION (ALTOCOMP)

Analog Input section

Inputs: Analog variable gain, 2 XLR-F electronically balanced Input Impedance: 44 kOhms Max. input Level: 15 dBu (4.4V RMS) Sensitivity: -22 dBu (63mV RMS)

Analog Output section

Outputs: Analog variable gain, 2 XLR-M electronically balanced Output Impedance <150 Ohms Max. output level: 17 dBu on 600 Ohms (5.5V RMS)

Digital / Analog Interface

Amplitude Response: 20 Hz - 20 kHz + 0.2 / - 2.5 dB Signal to Noise Ratio 90 dB (A wtg. / 20 Hz-20kHz) THD+N 0.03 % @ 1kHz -6 dB (VU-meter level) Group Delay 700 us Sampling Frequency 46.875 kHz Conversion 1 bit Sigma-Delta

Digital

Processor Speed: 12 MIPs DSP Resolution: 24x32bits

Control: Microprocessor

MIDI Section

Connections: Input/Output/Thru Sockets 5-poles DIN (female) Mode Photocoupled

Power Supply

Connector type: 3-pole IEC, grounded Type: Servo controlled, stabilized Mains supply: 115V or 230V 50/60 Hz Power Rating: 9 W

User Interface

numeric LCD Display: 2x20 characters Keyboard: 7 user keys / 5 LEDs VU meter: 2x6 LEDs

Physical

Size: Standard 19'' rack mounting Dimensions (W/H/D): 483mm 44mm 232.5mm (19.32'' 1.76'' 9.3'') Net Weight: 3.8Kg

B

2. Block Diagram

AC 115/230V

C

INPUT

D

8

A

OUTPUT R

7654321

KEY CONTR OL

S3

OUTPUT L

S4

POWER SUPPLY

VOLTAGE R EGULATOR

+12VA

-12VA

+5VD

LED DISPLAY

LRCKIN =46.875KH Z

BCK=1.500MHZ

OUTPUT LEVEL

OUTPUT BU F FER & AMPLIFIER

( 74HC393 )

LCD DISPLAY

MEMORY (DRAM)DSP

ED0-ED7

EA0-EA9

CLOCK DIVIDE

Q1

12.000MHZ

LCD DISPLAY &

KEY CONTR OL & LED DISPLAY

AD0-AD7

MPU

( P87C54UBAA )

SO0SI0

INTERFACE

( TMS57002DPHA )

AD0-AD7

STEREO AUD IO CODEC

A/D and D/A CONVERTER

( PCM3001E )

IN-R IN-L OUT-R OUT-L

INPUT LEVEL

INPUT BUF FER & AMPLIFIER

MIDI INTERFACE

MIDI

CONTROL

MIDI IN

MIDI THRU

S1

MIDI OUT

INPUT R

S2

1 2 3 4 5 6 78

INPUT L

D

C

B

A

4.1

3. Schematic Diagram

D

R51

470R

8

+5V

INR

XTAL

LRCKIN

R44

0R0

8

Q011Q110Q29Q3

U15B

74HC393

CLK

MR

13

U15A

BCK

J2 CON10A

R10

1

CLK

74HC393

Q03Q14Q25Q3

XTAL

12

13

11

R8

R11

1 2

3 4

5 6

R15R9R14R7R12

SO1

12

2

MR

6

R41

0R0

8 9

U4D

74F14D

BCK

C8

100nF

Vdasp

STRB

1213

U4F

74F14D

U5D 74HC32D

R13

R27

R24

7 8

9 10

R29

SI1

LRCKIN

D

7654321

R16

+5V

INL+INR

C21

J4

1 2

L3

330uH

Vdasp

SI0

SI1

SYNC

80

SI1

79

SI0

78

NC

77

LRCKI

76

BCKI

75

NC

74

VSS

73

VCC

72

NC

71

STRS

70 69 68 67

R/W

66

CS

65

A14

RS-CODEC

P1.4

P1.5

P1.6

P1.7

XTAL

L1

330uH

R1

10R

+5V

RS-CODEC

R35

10R

100nF

28

U13

PCM3001E

VINL1VCC12AGND13VREF L4VREF R5VINR6CINPR7CINNR8CINLN9CINPL10VCOM11VOUT R12AGND213VCC2

C33

10uF

C27

10uF

C40

100nF

C39

1uF/50V

SO0

+5V

2

1

5

4

NC3NC

S006S01

BCK0

SYPOL

LRCK0

CLOAD

DREADY

PLOAD

64

OVM

U4B

1 2 3 4 5 6 7 8 9 22 10

C3

1uF/50V

C1

C5

47/16V

100nF

S1

SGND

JP1

1 2

24

FMT225FMT126FMT027RSTB

C26 10uF

C42

82pF

SO1

9

7

10

CAS8RAS

BIO

AD7

OVFA

74F14D

U3

P87C52UBA A

NC1 P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7

RST

R2

1K5

D1

BAS16

C

22P

C29

Q1

12.00MHZ

22

21

23

20

VDD

XTO

CLKIO

DGND

C37

470P

C38

C28

10uF

13

14

11

VSS12VSS

CLKIN

CLKSEL

U8

AD5

AD6

3 4

A15

A8A9A10

25

P2.0/A824P2.1/A9

DGND

+5V44P0.0/AD 043P0.1/AD 142P0.2/AD 241P0.3/AD 340P0.4/AD 439P0.5/AD 538P0.6/AD 637P0.7/AD 736XTAL121XTAL2

AD0

AD1

AD0

AD1

O011O112O213O315O416O517O618O7

A010A19A28A37A46A55A64A73A825A924A1021A1123A122A1326A1427CE20OE22VPP

A0A1A2A3A4A5A6A7A8A9A10

C22

LRCKIN

SI0

BCK

SO0

17

19

15

18

DIN

XTI

LRCIN16BCKIN

DOUT

VOUT L

14

C34

10uF

470P

U4E

ED3

ED4

ED5

ED6

ED7

WE

ED715ED616ED517ED418ED319ED220ED1

TMS57002

AD1

AD2

AD3

AD4

A11

A12

A13

A14

A15 31

P2.2/A1026P2.3/A1127P2.4/A1228P2.5/A1329P2.6/A1430P2.7/A15

AD2

AD3

AD4

AD5

AD6

AD2

AD3

AD4

AD5

AD6

C

22P

4K7

R50

R40

1uF

C36

R43

100K

R42

100K

C35

1uF

SGND

10 11

4 5

74F14D

9 10

ED1

ED2

23

22

NC21NC

EA9

AD0

23

34

35

NC3

NC4

EA/VPP

20

AD7

AD7 19

OUTL

U10 HY534256A

SGND

OUTR

HY534256A U9

U5B

74HC32D

6

8

ED0

U5C

74HC32D

24

ED0

EA0

25

EA0

EA1

26

EA1

NC

27

EA2

28

EA2

NC

29

EA3

30

EA3

EA4

31

EA4

VSS

32

VCC

33

EA5

34

EA5

EA6

35

EA6

NC

36

EA7

37

EA7

TEST0

38

TEST1

39

TEST2

40

EA841EA942NC43NC44D045D146D247D348NC49D450D551VCC52VCC53D654D755PC056BI0570VFA580VFM59RS60NC61NC62EMPTY63MUTE

EA8

R21 R22

0R0

+5V

ALE/PROG

33

PSEN

32

NC2

12

P3.7/RD

19

P3.6/WR

18

P3.5/T1

17

P3.4/T0

16

P3.3/INT1

15

P3.2/INT0

14

P3.1/TXD

13

P3.0/RXD

11

U6A

1

A15

A11

A12

A13

A14

+5V

L2 330uH

Vdasp

/RD

R23

RXD

TXD

10K(OPT)

HT27C512P

R18

B

C41

82pF

ED6

ED7

EA7

EA8 18

25

22

26

23

OE

I/0224I/03

CAS

DGND

I/001I/012WE3RAS4A95A09A110A211A312+5V

ED4

ED5

EA9

EA0

EA1

EA7

EA8EA0

ED2

ED3

23

26

18

25

22

OE

I/0224I/03

CAS

DGND

I/001I/012WE3RAS4A95A09A110A211A312+5V

ED1

EA9

OVFA

1

3

S2

2

C6

1uF/50V

C9

100nF

U5A

74HC32D

RS

AD0

AD1

AD2

AD3

AD4

AD5

D12D23D34D45D56D67D78D8

19

A0A1A2A3A4A5A6

B

EA1

SW SPDT

3

U4A

AD6

ED0

+5V

1 2

I/O

U7A 74HC574D

EA4

EA5

EA6

A414A515A616A717A8

13

EA2

EA3

EA4

EA5

EA6

A414A515A616A717A8

13

EA2

EA3

P1.7

P1.6

P1.5

P1.4

6

14

A09A17A2

GS

74HC148

01011121231341526374EI

U2A

RS

P1.4

AD0

1 2

3 4

5 6

7 8

9 10

J1 HE A D ER 12X2

I/O

AD1 AD2

AD3 AD4

STRB

U4C

74F14D

5 6

12

74F14D

AD7

1

9

11

OC

CLK

Q812Q713Q614Q515Q416Q317Q218Q1

A7

C14

100nF

R30 10R

+5V+5V

11 12

13 14

AD5 AD6

AD7 AD8

U1 24LC64

C24

C25

+5V

U14

D3

BAS16

+15V

C13

100nF

R28

10R

R17

15

EO

5

BIO

15 16

17 18

19 20

21 22

2

S3

SW SPDT

1

3

/RD

+5V

R5

10R

C2

100nF

7

8

NC

VCC

NC1NC2A23GND

1uF/50V

100nF

R38

330R

LM317T(opt)

C30

47/50V

C31

100nF

-12V

+12V

C19

100P

14

+VCC-VCC

GND

1

R19

R31

C16

C12

23 24

1 2

+5V

12

OVM

J0

-12V

R49

R48

C23

C10

R3 100R

R4

C11

100R

6

SDA5SCL

4

A

V2.1

11of

KEVIN LIN.

1K

R39

D2

BAS16

C32

47/16V

RevisionModel No:

(Copyright S.E.E.D. S.R.L.)

Drawn By:

Sheet

DP BOARD [MK3.1]

20-May-2002

MK3.1.Sch

A3

Titel

Size

File:

Date:

C20

100P

+5V

7

147

U12E

U12A

SN75189

1 3

0R0

INL+INR

OUTL

OUTR

9 10

11 12

13 14

R34

2 3

TXD

C4

100nF

R6

10R

R37

10R

R25

10R

R26

10R

R33

10R

R20

10R

A

SN75189

RXD

R47

R45 0R0

2

R36

INR

+12V

L5

0R0

J3

15 16

17 18

19 20

HEAD ER 10X2

R46 0R0

168

U2B

74HC148

147

U15C

74HC393

147

U4G

74F14D

147

U5E

74HC32D

2814

U6B

HT27C512P

2010

U7B

74HC574D

SGND

L6

0R0

L7

0R0

1 2 3 4 5 6 78

U11E

SN75188

R32

C15

L4

3 4

5 6

7 8

+15V

C18

1uF/50V

U11A

SN75188

100nF

C17

100nF

C7

100nF

+5V

D

4.2

C

B

A

8

7654321

+5VD

P1

( TO LCD B/L )

J4

IDC14

( LCD CONNECTOR )

12345678910111213

AD0

AD1

AD2

AD3

AD4

RS_LCD

R18

10K

R36

R3

E_LCD

89

U10D

74HC04D

11

U9D

74HC32D

13 1011

U10E

74HC04D

AD5

R19

330R

C32

100nF

C2

10uF/16V

U9C

74HC32D

9

U9A 74HC 32D

2

12

1213

U10C

U10F

74HC04D

5 6

RS_LCD

(UTIL)

(EDIT)

(OVM LED)

D2

LEDD3LEDD4LEDD5LED

D1

LED

+5VD

14

DL2

R44

330R

R45

330R

74HC32D

11 12

13 14

15 16

17 18

19 20

21 22

DGND

R60

6

U9B

4

5

U10B

74HC04D

3 4

AD0

1 2

3 4

5 6

7 8

9 10

AD6

AD7

P2

8

10

3

1

(AGC ON)

(BYPASS)

D14

LED

D15

LED

D16

LED

D17

LEDD6LEDD7LEDD8LEDD9LED

DL3

DL4

DL5

DL14

DL15

R59

R58

330R

R57

330R

R46

330R

R47

330R

19

D12D23D34D45D56D67D78D89CLK11OC

U7A

74HC574D

AD0

AD1

INPUT1

J2

IDC20

1 2

3 4

5 6

7 8

9 10

330R

Q812Q713Q614Q515Q416Q317Q218Q1

AD2

AD3

AD4

AD5

AD6

AD7

INPUT2

OUTPUT2

OUTPUT1

11 12

13 14

15 16

17 18

19 20

( TO COUPLES WITH J2 ON MK3 )

AGNDDGND

+8VD

JP3

0R0

+5VD

23 24

TXD

C13

12pF

U2B

DL16

RXDM

R14

220K

R13

82K5

R8

0R0

TL074CD

DL6

DL7

DL17

R56

330R

R48

330R

R49

330R

R50

U8A

1

12345

J6

6P-2.5

( Digital stage conneter )

+5VD

OUT2

VR2A

A50K _LOG

1

3

2

7

C14

U2A

TL074

AGND

R9

0R0

D10

LED

DL8

DL9

DL10

330R

R51

330R

R52

330R

19

D12D23D34D45D56D67D78D89CLK11OC

74HC574D

AD0

AD1

AD2

AD3

AD4

AD5

+5VD

6

DGND

TXD

RXDM

AGND

R16

220K

12pF

14

U2D

12

13

R15

82K5

R10

0R0

8

U2C

TL074CD

D11

LED

D12

LED

D13

LED

DGND

C43

100nF

DL11

DL12

DL13

147

U9E

330R

R53

R54

330R

R55

330R

Q812Q713Q614Q515Q416Q317Q218Q1

1

AD6

AD7

2002,3,19 MOD. C4,R5

R5

10K

C4

200uF

123

J5

3P-2.5

AGND

( Analog stage connecter )

-12VA

+12VA

OUT1

AGND

VR2B

A50K _LOG

TL074

AGND

R11

0R0

XXX

CONTROL30 TERMINATORALTOCOMP

OOOOOOO

bVERB

74HC32D

C42

100nF

147

U10G

74HC04D

C41

100nF

2010

U7B

74HC574

C40

+5VD

2010

DGND

X

100nF

DGND

U8B

74HC574

123

J9

IN2

IN1

O

XXX

X

O

X

O

XXXX

X

J10

3P-2.5

AGND

+5VD

X

XX

+12VA

X

XX

411

O

+12VA

123

OUT1

OUT2

R4

220R

J1

C7

100nFC8100nF

U1E

C9

100nF

ALTO GROUP2 DIGITAL STAGE

2P-2.5

TL074

G2FP1-LINK

G2FP1-LINK.SCH

3P-2.5

AGND

1

2

(PW R-ON L ED)

C10

100nF

11of

VER020425

KEVIN LIN.

RevisionModel No:

Drawn By:

Sheet

Group2 b VERB

20-May-2002

G2FP1.Sch

bVERB KEYBOARD / DISPLAY

A3

Titel

Size

File:

Date:

-12VAAGND

5

AD1 AD2

AD3 AD4

AD5 AD6

AD7

R37

10K

R38

10K

R39

R40

10K

R41

10K

R42

+5VD

R43

10K

8

J8

SIP8-2.5

8

J7

SIP8-2.5

S2

S3

S4

S5

UP

DOWN

D

S6

ESC

ENTER

J3

IDC24

( TO J1 OF MK3.1)

C5

47uF/25V

1234567

S7

EDIT

DGND

S8

UTIL

BYPASS

VR1A

( VR1 : INPUT Volumn Control)

R1

C

6

2

VR3A

1

A10K_LOG

1K

B1K

3

INPUT2

C1

C6

47uF/25V

1

U1A

TL074

3

2

AGND

VR1B

R2

IN2

9

10 5

VR3B

4

B1K

6

VR3

R8R9R10

R11

R6

R7

C23

C24

C5

C6

411

U2E

TL074

ALTO GROUP2 ANALOG STAGE

INPUT1

C3

47uF/25V

7

U1B

TL074

5

6

AGND

A10K_LOG

1K

IN1

B

U1C

R6

8

TL074CD

10

2K2

OUTPUT2

14

U1D

TL074CD

9

AGND

C23

680P

12

13

AGND

C24

680P

R7

2K2

OUTPUT1

A

1 2 3 4 5 6 78

D

C

B

A

S3

OUTPUT2

2

4

L6

LF22uH

R25

C27

100uF/25V

14

U2D

12

13

321

(OUT P U T 1)

(FOR CONTROL30,

BetaVERB,ALTOCOMP)

BAL-MALE

1

3

L5

LF22uH

R24

4K7

C26

100uF/25V

TL074CN

R23

47K

R22

J5

3P-2.5

J4

3P-2.5

4K7

AGND

8

U2C

TL074CN

9

10

7

U2B

TL074CN

5

6

47K

1

2

3

1

2

3

OUTPUT1

2

4

AGND2

L8

LF22uH

AGND

C29

100uF/25V

14

12

13

AGND

(OUT P U T 2)

AGND

J2

AGND

S4

BAL-MALE

AC11V

GND

5P-3.9

1N4002

AC11V

1

2

3

4

5

LINK

MK31PU2LINK .SCH

ST-GND

GND CONNECT

TP1

DGND

STAR THE G ND S

D4

D5

1N4002

(OPT)

JR15

D6

1N4002

( CONNECT IN A STAR THE GNDS )

1

3

L7

LF22uH

R26

R27

4K7

C28

100uF/25V

4K7

AGND

AGND2

AGND

J3

D2

D3

1N4002

RevisionModel No:

VER020425

11of

Sheet

KEVIN LIN.

Drawn By:

ALTO GROUP2(CONTROL30)

8

U1D

TL074CN

R21

47K

1

6P-2.5

( Digital stage conneter )

+5VD

U1C

9

10

7

U1B

5

6

R20

47K

2

3

4

5

6

TXD

RXDM

C37

TL074CN

1000/25V

C41

100nF

C7

100nF

AGND

U13

7812

C20

1000/16V

C15

100pF

C1

100nF

DGND

L9

LF22uH

C8

L12

C44

C42

100nF

U11 7912

C21

C16

C3

LF22uH

1000/25V

100nF

U10

1000/16V

100pF

100nF

(OPT)

7808

1

U12

MK3.1-EXTENSION ( IN/OUT & POWER )

Titel

100nF

7805

L13

JP3 J10MM

2

C25

C24

47/25V

C18

LF22uH

5-May-2002

G2PU1.Sch

A4

Size

File:

Date:

2200UF/16V

C14

1000/16V

C17

100pF

C13

100nF

1

2

22K

3

AGND

( Analog stage connecter )

-12VA

+12VA

C19

100nF

14

U6E

+5VD

C30

100nF

AGND

4

U2E

C5

100nF

L14

330uH

4

U1E

+12VA

AGND2

C45

100nF

8

U3C

+12VA

C

+12VA

7

74HC08

11

TL074CN

11

TL074CN

4

TL072CN

J1

VR1

B500R

VR2

STEREO->

<-MONO

1

2

22P

3

SW SLIDE-A

**OUT -L

R8

22K

1

3

2

R7

22K

C12

47uF/25V

L4

LF22uH

2

1

3

S1

BAL-FEMALE

D

SW1

C23

B500R

R5

22K

22P

C22

U3A

TL072CN

AGND

AGND2

6

R4

22K

C10

47uF/25V

L2

LF22uH

1

S2

BAL-FEMALE

22K

R11

R6

22K

C11

47uF/25V

L3

LF22uH

4

INPUT2

(MONO IN)

3P-2.5

**OUT -R

7

U3B

TL072CN

5

R12

R3

22K

C9

47uF/25V

L1

LF22uH

2

3

4

INPUT 1

AGND

-12VA

RXDM

R30

220R

+5VD

6

4

CN1

5

1

R34

220R

5

3

MIDI I N

DGND

ISO1 H11L1(QTC)

AGND

2

C31

100nF

D1

1N4148

AGND

C6

100nF

1

2

4

-12VA

AGND

C46

100nF

-12VA

B

TXD

12

13

DGND

U6D

74HC08

11

+5VD

R33

1

220R

4

CN2

R35

2

5

3

MIDI OUT

220R

+5VD

10

U6C

74HC08

8

+5VD

R31

220R

1

2

4

5

CN3

MIDI THRU

A

DGND

9

R32

220R

DGND

3

1 2 34

MK31 PCB LAYOUT

4. Printed Circuit Diagram

TOP LAYER

TOP SOLDER MASK

BOTTOM SOLDER MASKBOTTOM LAYER

TOP SILKSCREEN

--------------------------------------------------------------------------NCDrill File Report For: MK31-EMI.PCB

--------------------------------------------------------------------------Layer Pair : TopLayer to BottomLayer ASCII File : NCDrillOutput.TXT EIA File : NCDrillOutput.DRL

Tool Hole Size Hole Count Plated

--------------------------------------------------------------------------T1 20mil (0.50mm) 328 T2 24mil (0.60mm) 2 T3 31mil (0.80mm) 64 T4 36mil (0.90mm) 69 T5 138mil (3.50mm) 6 NPTH

--------------------------------------------------------------------------Totals 469

DRILL DRAWING

MK31

排片方式

MK31-FDKB PCB LAYOUT

BOTTOM SOLDER MASK

BOTTOM LAYER

TOP LAYER & TOP SOLDER MASK

TOP SILKSCREEN

DRILL DRAWING

Tool Hole Size Hole Count Plated

--------------------------------------------------------------------------T1 39mil (1.00mm) 36 T2 98mil (2.50mm) 14 NPTH T3 126mil (3.20mm) 3 NPTH

--------------------------------------------------------------------------Totals 53