Alto DJM-3 Service Manual

Service Manual

Model: DJM-3 (2-CHANNEL VCA-CONTROLLED DJ MIXIER)

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

4. Technical Specifications

Model NO: DJM-3 ( 2-CHANNEL MIXER )

AUDIO INPUTS

Mic Input Phono Inputs 1 and 2 Line Inputs 1and 2 Return

AUDIO OUTPUTS

Main Out Tape Out Send Headphones

EQUALIZER( / 8dB)

Stereo Bass Stereo Middle Stereo Treble Stereo Bass Stereo Treble

GENERAL

Signal-to-Noise ratio(S/N) Crosstalk Distortion(THD) Frequency Response Input Gain Adjustment

40dB gain,servo-balanced 40dB gain@1kHz,unbalanced 0dB gain, unbalanced 0dB gain, unbalanced

max 21dBu typically 0dBu typically 0dBu typically 125mW@ 1% THD

15dB/ 30dB@50Hz 15dB/ 30dB@2.5KHz 15dB/ 30dB@10KHz 15dB/ 15dB@30Hz 15dB/ 15dB@20KHz

90dB(LINE) 70 dB 3dB(LINE)

0.1%

20Hz-20KHz ( 2dB)

20dB - 9dB ( 3dB)

POWER SUPPLY

Main voltage

Power Consumption Fuse

Main connection

DIMENSIONS AND WEIGHT

Dimension weight

USA/Canada100-120V~, 60Hz Europe210-230V~, 50Hz U.K./Australia240V~, 50Hz 12watts 95-120V~ : T400mAL 210-240V~ : T200mAL Standard IEC receptacle

248(L) 245(W) 76.6(H)mm (9.8" 9.6" 3.0")

2.9Kg (6.39lb)

11

D

87654321

C

B

A

V1.0

11 of

TASY J S

RevisionModel No

Drawn By

Sheet

DJM-3

4-Sep-2002

(EFFECTS)

L

RETURN TO MAIN

TYPE

R

(MAIN OUT)

L

AMP

R

(MAIN OUT)

L

R

SEND FROM PFL

(EFFECTS)

L

R

3c

1a4d2b

PHONES OUT

5e

Titel

Djm-3 DIGRAM Sch

DJM-3 BLOCK DIGRAM

A3

Size

File

Date

PFL LEVELPFL MODE

GAIN

PFL MIX

Voltage Controlled Amplifier

HI

LO

MIC ON SW

3c5e14d2b

MIC INPUT

2-BAND EQ

GAIN

HI

LO MID

8

9

P

SW3C

SW3A

123

A

PHONO

CHANNEL 1(INPUT)

PHONO LINE

L

3-BAND EQ

GAIN

7

LINE

R

HI

LO MID

GAIN

101112

SW3D

P

SW3B

6

456

B

3-BAND EQ

P

4

5

P

LINE

PHONO

PHONE / LINE

CHANNEL 2(INPUT)

HI

LO MID

PHONO LINE

SW3C

SW3A

123

A

L

8

9

P

123

PHONO

3-BAND EQ

GAIN

7

LINE

R

HI

LO MID

GAIN

101112

SW3D

P

SW3B

6

456

B

3-BAND EQ

P

4

5

P

LINE

PHONO

PHONE / LINE

LEVEL METER

TIME OFFSET

TEMPO DIFFERENCE

BPM

SN8P1707Q

1 2 3 4 5 6 7 8

D

C

B

A

12111098765321

C132

10n

C137

C138

IC13A

R149 10K

IC13B

R192

C133 10n

R194

10n

R195

10n

R74 1M2

C8A

R73

220K

C101

C8B

2068

TL074

IC20C

R121 10K

R148

10K

R108

10K

TL074

C146 150n

33k

R128 8K06

C147 150n

R193 33k

R129 8K06

C148 150n

33k

R138 8K06

C149 150n

33k

R139

8K06

2068

20P

R109

10K

C124

56P

TL074

C123

56P

R155

4k7

R156

1K5

R142

3K3

C127

6n8 R111

18K

R158

4k7

R157 1K5

R143

3K3

C128

6n8

R112 18K

R167 4k7

R168

1K5

R151

3K3

C129

6n8

R124 18K

R170 4k7

R169

1K5

R152

3K3

R125 18K

D8

4148

1

C49 10u/25V

R231 2K2

7

C47 10u/25V

MAIN OUT LEVEL

C41

10uF 25V

VR4A 10KA

1

R119

20K

8

R135

20K

C40

MAIN OUT LEVEL

7

10uF/25V

VR4B 10KA

C117 5n6

R94 33k

C121 56p

13

1

IC7D

12

C118

5n6

C122 56p

9

IC7C

10

C119 5n6

C125 56p

13

IC11D

12

C126 56p

9

IC11C

10

C130 6n8

VR9 50KB

1 3

SOFT MID SHARP SOFT M D SHARP

C30

10uF/25V

R120 20K

13

IC20D

12

C131 100n

SURROUND

C29

10uF/25V

TL074

C120 5n6

TL074

MAIN OUT

TALK

-15V 3

VR17 100KB

CH1 CURVE

R59 22K

220uF/6.3V

TL074

R58 22K

R95 33k

8

R106 33k

1

R107 33k

8

R225

2

1M

9

10

C61

13 12

PHONE/LINE OUT L1

R165 18K

C140 20P

2

IC17A

3

O64C

PHONE/LINE OUT R1

PHONE/L NE OUT L2

R185 18K

C145

20P

6

IC17B

5

064C

PHONE/LINE OUT R2

R229 10K

R214 150K

R226 51K1

5

IC24B

6

567

SW13

123

R80 47K

C105 20P

IC13C

TL074

3

SW8A

VR13

2

1KA

SURROUND

R79 47K

C104 20P

C31

IC13D

47uF/25V

TL074

C59

10uF/25V

1

C60

10uF/25V

X15

SHARP

D19

4148

7

2068 C161

27n

R223

200K

R2337KR232

C32

8

47uF 25V R49

3 2

1

D20

4148

-15V 3

VR18 100KB

R234

8K2

2K2

100K

15V

R190 2K2

SW8B

5

6

P

SURROUND

( SURROUND ON)

GRN

R48 100K

R215 150K

R228

2

1M

CH2 CURVE

R191 2K2

LD4

RB7 RB6

VDD

D1

1 8

R22

15V

16 15 1 13 12 11 10 9

-15V

R212 27K

10K

C3

SGND

RA RA3

RA2 RA1

RA0

20P

SGNDVDD

R1 220 R13 220

R12 220 R11 220

R10 220

C2 10uF

R5 K7

Left Meter Right Meter

R6

K7

-20dB

RA0

LED7

-10dB

RA1

LED6

-7dB

RA2

LED5

- dB

RA3

LED

-2dB

RA

LED3

MIC OUT R

MIC OUT L

R219 511R

C157 560P

PHONE LINE OUT L1 PHONE LINE OUT L2

PHONE LINE OUT R1 PHONE LINE OUT R2

C108 100n

C109 100n

C114

C11E

100n

TL074

C115 100n

11

X1

8MHz

SGND SGND

1

VPP

2

P0.0/INT0

3

P0.1/INT1 P0.2/INT2

5

RST

6

P1 5

7

P1.

8

P1 3

9

VDD

10

P1 2

11

P1 1

VDD

TR1 PNP

LED

IC13E TL074

11

C 20P

2

3

XIN

XOUT

P1.012P2.013P2.11P2.215P2.316VSS17AVSS18P .7/AIN719P .6/AIN620P .5/AIN521P . /AIN

VDD

R7

K7

-20dB LED

RA0

LED12

-10dB LED

RA1

LED11

-7dB LED

RA2

LED10

- dB LED

RA3

LED9

-2dB LED

RA

LED8

SEND L

SEND R

C112 100n

C113 100n

Beat Assist

SW2A

1

VDD VDD

2

Ch2

3

R K7

SGND

1 2 3

VDD

SGND

R3

K7

C1 10 P

TEST1

SGND

R1 220R2220

SGND SGND

LED2 LED

Ch2

Ch1

LED1 LED

Ch1

SW PS-22E85L SW1A

SW PS-22E85L

Beat Led

15V

R216 30K

IC23

MODE1V

2

I IN1

I IN

3

I C1

V C

I OUT1

I OUT

5

I OUT2

X15

R230

SMOOTH

10K

R227 51K1

3

2068

1

IC24A

2

C162

27n

R224 200K

567

R236 47K

SW14

123

R218

R222

R220

27K

511R

C160

C158

560P

R235 8K2

560P

15V

IC1E

TL074

11

-15V

I OUT3

6

V C2

V C3

7

I IN2

I IN3

8

GND

V-

SSM2164

R217

R213

R221

27K

511R

C159 560P

IC7E

IC17E

TL074

064C

11

RB5 RB

R25K7R26

R23K7R2

K7

3

35

36

37

P2.38P2.539P2.60P2.71VSS

SGNDSGND TR2 PNP

Ch1 Music

Ch2 Music

P5. /TC0/PWM0

P5.1/SI

P5.2/SO

P5.0/SCK

P5.3/TC1/PWM1

22

Left Meter Right Meter

R8

K7

0dB

RA0

LED17

2dB

RA1

LED16

dB

RA2

LED15

7dB

RA3

LED1

10dB

RA

LED13

D5

R32 8K2

6 5

R31 8K2

9

10

P .0/AIN0 P .1/AIN1

P .2/AIN2 P .3/AIN3

1 8

D 1 8

D3 1 8

D2 1 8

DAO VDD

AVREF

SN8P1707

LED

P5 5 P5 6 P5.7

VDD

IC2

TR3 PNP

R36 62K

IC1B TL07

R35 62K

IC1C TL07

33 32 31 30 29 28 27 26 25

2 23

7

8

R21 220 R20 220 R19 220 R18 220

R17 220 R16 220 R15 220

RA0

RA1

RA2

RA3

RA

VDD

SGND

R30 K7 R29 K7 RB2 R28 K7 R27 K7

R9

K7

0dB

LED22 2dB

LED21

dB

LED20 7dB

LED19 10dB

LED18

D21

1 8

D6 1 8

Q0 Q1 Q2 Q3

Q Q5 Q6

C9 10

RB3 RB1

RB0

VDD

TR PNP

LED

R238 1K

R237

1K

PFL MODE

R99 47K

R 00 47K

PHONE LINE OUT R2

R118 1K

PHONE LINE OUT R1

R1161KR115

R101 47K

C110 100n

C111 100n

SW5A

2 3

VR3B 50KB

SW5B

5 6

P

VR3A 50KBA

R117 1K

C53 10uF/25V

R102

7K

1K

C52

10uF 25V

8

IC24C 4580

PFL LEVEL

C163 100n

C164 100n

C27

47uF/25V

C28

47uF/25V

PHONE/LINE OUT L2

PHONE/LINE OUT L1

R39 22R

R40 22R

R4 22R

R42 22R

R77 180K

C50

10u/25V

C102

20P R88 33K

6

7

IC9B

5

TL074

R65

R66

47K

PFL MIX

R86

VR8B

47K

6

20KB

5

R87 47K

R78 180K

C51

C103

10u/25V

20P

R89 33K

2

1

IC9A

3

TL074

R71

R72

47K

IC20E TL074

11

3

PFL MIX

VR8A

2

C155 100n

C156 100n

7K

R91

47K

1

20KB

R90 47K

8

C8C

4580

SGND

R45 2K49

C38

10uF/25V

R46 2K49

C39

10uF/25V

R161 100K

R147 100K

RB0

Q0 Q1 Q2 Q3 Q Q5 Q6

C6 1 0uF

C5 1 0uF

R47 12K

13 12

R55 100K

9

10

R56 100K

IC9E TL074

VDD VDD VDD

RB1

TR6 PNP

11

a

7

b c

2

d

1

e

10

f

5

g

3

dp

IC3 LED-7SEG-3

SGND

C95 20P

C9D

TL074

R57 12K

C97 20P

C9C

TL074

11

RB2

TR7 PNP

12

9

8

A1

A2

A3

Ch1 BPM Ch2 BPM

RB6

Ch2 Side Ch2 Side

Q0

Q1

Q2

Q3

Q

Q5

Q6

Ch1 Side Ch1 Side

C8

1.0uF

C7

1.0uF

R43 47R

R44 47R

1

R69 47R

R70 47R

8

7 8 9

VDD

Time Offset Tempo Difference

LED29

LED28

LED27

LED26

LED25

LED2

LED23

1K

R239

1K

AMP R AMP L

R160

62K

SW6C

SW PS-42E85L

PHONES OUT L

PHONES OUT R

SW6A

P

C25 47uF/25V

C26 47uF/25V

TR5 PNP

LED

D11

1 8

D22

1 8

R146 62K

2 3

TR8 PNP

1

RB3

11

Q0

7

Q1 Q2

2

Q3

1

Q

10

Q5

5

Q6

3

RB7

D13

1 8

D12

1 8 IC1A

TL07

1

D10

1 8

D9 1 8

IC1D TL07

LEVEL METER

SW6D

P

VDD VDD VDD

RB

LED36

LED35

LED3

LED33

LED32

LED31

LED30

RB5

TR11 PNP

12

9

8

A1

A2

A3

VDD

TR9 PNP

LED

R3 8K2R2 0

2 3

13

12

5 6

R153 2K2

Left Meter

R33 8K2

Right Meter

SW6B

MAIN

LD3 RED

P

LD2 GRN

-15V

Titel Size

A3

D t : File:

IC LED-7SEG-3

Q0

Q1

Q2

Q3

Q

Q5

Q6

10 11 12

R141 2K2

TR10 PNP

a b c d e f g dp

R38 62K

R37 62K

TR12 PNP

PFL

DJM3 PRE&BPM

DJM 3 1 0

24 Oct 2002 DJM3 PRE A&D Sch

Sh t Drawn By:

RevisionModel No:

11 f

J S TASY

D

C

B

A

C141 150n

R202

27K

R201

C42

TL074

C106 220P

C107

220P

TL074

C153 150P

27K C152

150P

10uF/25V

10uF 25V

R92

100K

R93

100K

10uF/25V

BAT54 ( FM103 )

R98 10K

1

C43

10u/25V

7

R172

1K5

VR15B

LOW

R154

50KE

1K5

VR11B 50KE

MID

C33

R127 33K

VR6B

R110

50KE

HIGH

2K49

7

R81 100K

C142 150n

R82 100K

R173 1K5

VR15A

LOW

50KE

R159

1K5

VR11A

MID

1

C34

C44

7

1

C45

R188 2K2

15V

50KE

R130

33K

HIGH

R113

2K49

VR6A

50KE

C143 150n

R186 1K5

VR16B

LOW

R166

50KE

1K5

VR14B 50KE

MID

R137

33K

R123

VR10B 50KE

2K49

HIGH

C144 150n

R187 1K5

VR16A

LOW

R171

50KE

1K5

VR14A

MID

50KE

R140

33K

VR10A

R126

50KE

HIGH

2K49

LD1

R189

( LEVEL ON )

GRN

2K2

-15V-15V

R84

R75

47K

4K7

R85 100R

2

D7

3

R76

C37

0.47u/50V

560K

3

6

C46

10uF/25V

2

VR12 10KA

R83

00K

1

R105

10K

2

R104

3

10K

R150 8K2

10

9

R136

0K

R122 8K2

R103

6

10K

5

CHANNEL 1

R62

SW

D

CN13

LINE L1

1

LINE R1

2 3

PHONO R1 PHONO L1

5 6

LINE R2

7

LINE L2

8 9

PHONO R2

10

PHONO L2

11 12

12PIN

PHONE/ LINE

SW3A

1 2 3

SW3B

P

6 5

SW3C

P

8 7

SW3D

0 11 12

P

1K5 C99

VR1B

220P

10KC

6

R50 2K49

R51 2K49

IC7B

5

GAIN

R63 1K5

C100

VR1A

220P

10KC

2

C7A

3

CHANNEL 2

R67

SW

PHONE/ LINE

SW4A

SW4C

P

LOW

1 2 3

6 5

R64 2K7

1

2

VR7

20KC

3

R96 301R

SW4B

C116 100N

C48

1uF/50V

8 7

SW4D

P

0 11 12

P

C56

220uF/ 6 3V

R114

100K

C35 10uF 25V

R54

R97 4K7

301R

C36 47uF 25V

C63

10uF 25V

R207

27K

C62

10uF 25V

R204

27K

C

CN10

MIC IN

1 2 3

5

PHONES OUT R

6

PHONES OUT L

7 8

SHARP

9

SMOOTH

10

10PIN

B

CN14

1 2 3

5 6 7 8

9 10 11 12 13 1

14PIN

A

15V

-15V PHONES OUT R

PHONES OUT L

SHARP

SMOOTH

C98 27n

R52 330R

1

MIC INPUT MIC INPUT

HIGH

2

VR2 20KC

3

R53 47R

C96 100N

RETURN L RETURN R

TAPE L TAPE R

SEND L SEND R

15VVDD

-15V

SGND AMP L

AMP R

1 2 3 5 6 7 8 9 10 11 12

1K5

VR5B

6

10KC

IC11B

R60

5

2K49

TL074

GAIN

R68 1K5

VR5A 10KC

2

IC11A

3

R61 2K49

MIC IN

LEVEL ON

SW7B

5

P

SW7A

2 1

MIC INPUT

LEVEL

M C OUT R

R206 27K

2

IC20A

R200

3

27K

TL074

MIC OUT L

R199 27K

R205 27K

6

TL074

IC20B

5

10uF/25V

87654321

IC4A 2068

IC4B 2068

C6

100P

C5 100P

C13 10uF/25V

C14 10uF/25V

10uF/25V

1

10uF/25V

7

C20

C19

R1 47K

R2 47K

R6 47K

R5

47K

R13 2K2

R16 2K2

R14 2K2

R15

2K2

LINE L1

LINE R1

PHONO L1

PHONO R1

POWER IN 9V

1 2 3

CN1

3P-3.9

C28 1000uf/35v

C30

1000uF/35V

DJM3-PWR

D2

1N4004

D1

1N4004

D3

1N4004

D4

1N4004

D5

1N4004

D6 1N4004

C29

1000uF/35V

C32

470uF/25V

C31

1000uF/35V

X1

7915

X1

7805

X3

7815

C33 100n

C34 100n

C35

100n

-15V

+5V

+15V

C15

10uF/25V

C16

10uF/25V

C21

10uF/25V

DC OUT

5 4 3 2 1

CN2

5P-2.5

D

C

CHANNEL 1

PHONO (INPUT1)

L

D

CN-RCA2-4PORT

R

SW1A

SW PS-22E85L

PHONO

LINE

C28

100P

SW1B

PHONO

LINE

SW PS-22E85L

P

C29 100P

C

LINE (INPUT1)

X1

C42 47uF/25V

1 2

3

C17

10uF/25V

C43

47uF/25V

4

5

6

C18

10uF/25V

R23 120R

R24 120R

R4 47K

R3 47K

L

R

C46

27n

C47

27n

C1 6n8

R28

10K

R31 100K

2

3

C2

6n8

R27 10K

R32

100K

6

5

SEND FROM PFL(EFFECTS) RETURN TO MAIN(EFFECTS)

C36 470P

C37 470P

C39 470P

C40

470P

L

R

L

R

IC5C 2068

8 4

X3

CN-RCA2-4PORT

X4

CN-RCA2-4PORT

-15V

IC4C 2068

8 4

+15V

L

C9 100P

R

C10 100P

L

R

C11 100P

C38 470P

C41 470P

R36

100R

R35

100R

RETURN R

TAPE L

TAPE R

LINE L1 LINE R1

PHONO R1 PHONO L1

LINE R2 LINE L2

PHONO R2 PHONO L2

-15V +15V

+5V

Titel

C12 100P

Size

Date: File:

A3

1 2 3 4 5 6 7 8 9 10 11 12

CN2 12P-2.0

5 4 3 2 1

CN3

5P-2.5

DJM3-PU & DJM3-PWR

24-Oct-2002

DJM3-PU.SCH

DJM-3

CN1 14P-2.0

1

RETURN L

2

RETURN R

3

SEND L

4

SEND R 5 6 7 8 9

10 11

TAPE L

12

TAPE R

13

AMP L

14

AMP R

Sheet Drawn By:

+15V +5V

-15V

RevisionModel No:

J.S.TASY

B

A

V1.0

11 of

CHANNEL 2

PHONO (INPUT2)

L

B

R

LINE (INPUT2)

L

X2

CN-RCA2-4PORT

R

C22

10uF/25V

C7 100P

C23

10uF/25V

C8

100P

R8 47K

R7 47K

R17

2K2

R18 2K2

LINE L2

LINE R2

R21

SEND L RETURN L

SEND R

1K

R22

1K

AMP ( MAIN OUT) TAPE ( MAIN OUT)

R10 47K

47K

R9

C48

27n

C3

6n8 R29

10K

R33

100K

2

3

C4

6n8C49

R30

10K

R34 100K

6

5

IC5A 2068

IC5B

2068

C24

1

10uF/25V

C27

10uF/25V

7

R11 47K

R12

47K

R19 2K2

R20 2K2

PHONO L2

PHONO R2

AMP L

AMP R

R37

100R

R38

100R

SW2A

SW2B

P

C44 47uF/25V

1 2

3

C45

47uF/25V

4 5

6

C25

10uF/25V

C26

10uF/25V

R25 120R

R26

120R

SW PS-22E85L

PHONO

LINE

C30 100P

SW PS-22E85L

PHONO

A

LINE

C31 100P

1 2 3 4 5 6 7 8

D

C

B

A

V1.0

11 of

J.S.TASY

+15V

4321

PHONES OUT R

PHONES OUT L

-15V

RevisionModel No:

Drawn By:

Sheet

MIC IN

R32

62KC9100P

R9

68K1

D1

3c5e1a4d2b

PHONES IN

X2

PHONEJACK5 (5-PN)

6

1K

R29

C7

10uF/25V

3c5e1a4d2b

MIC IN

X1

PHONEJACK5 (5-PIN)

R10

2K21D2

4148

123456789

X6

SMOOTH

D6

7

IC3B

2068

C12

R30

100P

5

R31

62K

1K

C8

10uF/25V

7

R11

240K

C3

22P

6

R27

10K

IC2B

5

D5

4148

33K

R21

CURVE

CROSSFADER

TL074

4148

R6

5K62R5

-15V

1

IC1A

2068

3

2

R7

4K99

R8

240K

4148

1

C10

2n7

IC2A

3

2

R26

36K

R20

R19

2

3

VR1A

100KB

68K1

R16

D3

TL074

47K5

10K

1

4148

R28

10K

-15V

R17

R14

R15

10

D7

2K21

D4

4K99

240K

10P

4148

CROSSFADER

R18

240K

4148

2n7

C11

33K

R23

CURVE

6

-15V

R13

SHARP

DJM3-FP

D8

4148

14

24-Oct-2002

DJM3-FP.Sch

A4

Titel

Size

File:

DJM-3

IC2D

TL074

12

13

-15V

R25

36K

5

VR1B

8

5

100KB

10

IC1B

IC2C

2068

R22

TL074

47K5

10K

4

C5

100nC6100n

411

IC2E

TL074

84

IC3C

2068

84

IC1C

+15V

2068

-15V

R24

C4

22P

9

5K62

7

6

Date:

+15V

D

C1

10n

123

4

CN1

4P-25

R2

R1

6K34

4K99

100K

REVERSE HOLD

SW1

1 2

3

48

R3

1K65

-15V

R4

10R

R12

100K

C2

10n

5 6

7

1 2 3 4

REVERSE TAP

C

B

A

4. PRINTED CIRCUIT DIAGRAM

PCB : DJM3-PRE Top Overlay

PCB : DJM3-PRE Bottom Layer

PCB : DJM3-PRE Bottom Overlayer

y

PCB : DJM3-PU Top Laye

r

PCB : DJM3-PU Top Overla

PCB : DJM3-PU Bottom Layer

PCB : DJM3-PU Bottom Overlay

PCB : DJM3-FP Bottom Overlay

y

PCB : DJM3-FP Bottom Layer

PCB : DJM3-FP Top Overla

PCB : DJM3-VR Top Overla

y

PCB : DJM3-VR Bottom Layer

PCB : DJM3-VR Bottom Overlay

PCB : DJM3-PWR Top Overla

PCB : DJM3-PWR Bottom Layer