Alto DJM-2 Service Manual
Service Manual
Model: DJM-2(2-CHANNEL DJ MIXER)
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
INPUTS
Phono Inputs 1 and 2
Line Inputs 1 and 2
Mic Input
OUTPUTS
Headphones
Main Out
Tape Out
GENERAL
Stereo Bass
Stereo Treble
Input Gain Adjustment
Signal to Noise ratio (S/N)
Distortion (THD)
Frequency Response
48dB gain@1kHz,unbalanced
8dB gain, unbalanced
58
dB gain, servo balanced
typically 125mW@ 1% THD
max +21dBu
typically 0dBu
+15dB/ 30dB
+15dB/ 30dB
20dB 6dB ( 3dB)
>85dB (LINE)
0.1%
20Hz 20KHz ( 2dB)
POWER SUPPLY
Connector type
Mains Voltage
Rated Power Consumption
Fuse
DIMENSION AND WEIGHT
Dimension
Weight
3 pole IEC, grounded
USA / Canada100 120V~, 60Hz
Europe 210 240V~, 50Hz
U.K. / Australia 240V~, 50Hz
10watts
100 120V~ : T200mAL
210 240V~ : T100mAL
221.5(L) 245(W) 76.6(H)mm (8.7" 9.6" 3.0")
2.6Kg (5.73lb)
D
87654321
C
B
A
11 of
TASY J S
RevisionModel No
Drawn By
Sheet
DJM-2 V1.0
24-Dec-2002
TYPE
(MAIN OUT)
AMP
R
L
(MAIN OUT)
L
GAIN
R
GAIN
3c
1a4d2b
PHONES OUT
5e
Titel
Djm-2 DIGRAM Sch
DJM-2 BLOCK DIGRAM
A4
Size
File
Date
PFL LEVEL
MIX
3c5e14d2b
MIC INPUT
GAIN
HI
LO
8
9
P
SW3C
SW3A
123
CHANNEL 1(INPUT)
PHONO LINE
L
2-BAND EQ
GAIN
7
R
HI
LO
2-BAND EQ
GAIN
0
11
12
P
SW3D
P
SW3B
4
5
6
PHONE / LINE
CHANNEL 2(INPUT)
HI
LO
PHONO LINE
L
SW3C
SW3A
P
2-BAND EQ
8
9
123
HI
LO
GAIN
7
SW3D
SW3B
GAIN
0
P
6
2-BAND EQ
11
12
P
4
5
PHONE / LINE
LEVEL METER
BPM
TIME OFFSET
TEMPO DIFFERENCE
SN8P1707Q
R
1 2 3 4 5 6 7 8
D
C
B
A
12111098765321
C 7
C33
R45
C24
C26
150n
CHANNEL 1
D
SW
PHONE/ LINE
SW1A
SW1C
CN1
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
P
1
2
3
SW1B
SW1D
P
6
5
P
VR1A
10KC
R1
2K49
9
8
7
GAIN
VR1B
10KC
10
11
R2
2K49
12
C5
R12
10uF25V
1K5
C2
220P
6
7
5
IC1B
R19
TL074
00K
R20
R11
100K
1K5
C1
220P
2
3
C10
IC1A
10uF/25V
TL074
CHANNEL 2
C8
10uF/25V
MIC IN
R15
1K5
C3
GAIN
220P
9
8
10
R28
C2C
100K
TL074
R27
R16
100K
1K5
C4
220P
3
1
12
C9
C2D
10uF25V
TL074
C13
R126
10uF25V
1K
3c
d
2b
1a
5e
10uF/25V
2
R120
3
1K
C12
R127
62K
8
C98
IC7C
100n
2068
C9
100n
VR2A
10KC
R4
2K49
VR2B
10KC
R5
2K49
15V
8
IC8C
2068
-15V
C
B
A
SW
PHONE/ LINE
SW2A
1
2
3
SW2B
P
6
5
SW2C
SW2D
P
P
9
8
7
10
11
12
X2
PHONEJACK5 (5-PIN)
150n
R61
R43
1K5
R13
1K5
R3
390R
C25
150n
R44
1K5
R14
1K5
R7
390R
C29
150n
R52
1K5
R17
1K5
R8
390R
C28
150n
R51
1K5
R18
1K5
R6
390R
R128
62K
C69
100P
C70
100P
C96
100n
C97
100n
33
VR3B 50KE
LOW
HIGH
VR5B
50KE
C27
150n
R62
33k
VR3A 50KE
LOW
HIGH
VR5A
50KE
C30
150n
R65
33k
VR4B 50KE
LOW
HIGH
VR6B
50KE
C31
150n
R66
33k
VR4A 50KE
LOW
HIGH
VR6A
50KE
C71
220uF/ 63V
1
C8A
2068
R35
100K
CN2
10PIN
1
2
3
5
6
7
8
9
10
IC6E
TL074
11
5n6
4k7
C36
56p
9
10
R71
1K5
R72
1K5
R73
1K5
R74
1K5
TAPE L
TAPE R
C84
100n
C85
100n
R46
4k7
13
12
R53
4k7
R54
4k7
MIC INPUT
LEVEL
TL074
C32
5n6
C37
56p
TL074
C34
5n6
C38
56p
6
5
TL074
C39
56p
2
3
TL074
SGND
IC5E
TL074
11
PHONE/LINE OUT L1
8
8
6
5
9
10
SW
CH1 CURVE
SW5
CH2 CURVE
MIC OUT R
R134
27K
C77
150P
C4B
TL074
MIC OUT L
R135
27K
C76
150P
IC4C
TL074
C90
100n
C91
100n
R 7
567
123
567
123
SHARP
R55
K7R3100K
7
C73
10u25V
8
C15
0uF25V
TL074
R63
33K
8
C 2
C1C
220uF
R75
18K
C46
20P
6
5
R64
33k
1
C 3
IC1D
220uF
PHONE/L NE OUT R1
PHONE/LINE OUT L2
R67
33k
7
C
IC2B
220uF
R76
18K
C50
20P
9
10
C35
5n6
R68
33k
C 5
1
220uF
IC2A
PHONE/L NE OUT R2
3
6
C14
10uF/25V
2
VR10
10KA
C86
100n
C87
100n
R36
1
100K
15V VDD
-15V
IC4E
TL074
11
R21
100K
VR7A
B100K
R22
100K
SOFT SHARP
C6
10uF/25V
7
IC3B
TL07
R23
100K
VR7B
B100K
R2
100K
R29
100K
VR8A
B100K
R30
100K
SOFT
C11
10uF/25V
8
IC3C
TL074
R31
100K
VR8B
B100K
R32
100K
R133
4K7
R131
220K
C52
C72
20P
10u/25V
7
IC8B
2068
R132
4K7
AMP L
AMP R
C88
IC3E
100n
TL074
C89
100n
11
C59
R25
10uF
100K
K7
R26
VR9A
100K
B100K
R 8
R56
K7
R33
100K
C61
10uF
VR9B
B100K
R84
10K
R83
10K
C92
C2E
100n
C93
100n
11
R77
150K
2
3
K7
R78
150K C62
3
12
R86
10K
C40
56P
2
3
C5A
TL074
R85
10K
C41
13
56P
12
IC5D
TL074
IC1E
TL074
11
20P
R79
120K
C4A
TL074
SW7A
Ch2
SW PS-22E85L
SW6A
Ch1
SW PS-22E85L
C51
20P
R80
120K
IC4D
TL074
MAIN OUT LEVEL
C17
10uF25V
VR11A
10KA
1
C16
10uF/25V
MAIN OUT LEVEL
VR11B
10KA
1
C94
100n
C95
100n
1
1
2
3
1
2
3
1
10uF/25V
10uF/25V
C60
R160
10uF
15K
MIC OUT L
VDD
D1
1 8
R82
10K
Beat Assist
VDD
R 9
K7
SGND
VDD
SGND
R81
RES1
TEST1
LED1
LED
R107
Ch1
220
SGND SGND
Beat Led
R161
10uF
15K
MIC OUT R
C18
R136
22K
6
5
C19
R137
22K
9
10
10uF/25V
VDD
C7
R50
SGND
K7
C79
47uF/25V
C78
47uF/25V
RA
RA3
RA2
RA1
RA0
Left Meter Right Meter
R57
-20dB
RA0
-10dB
RA1
-7dB
RA2
- dB
RA3
-2dB
RA
R38
00K
R37
100K
VDD
C6
10
SGND
LED2
LED
R108
Ch2
220
R139
47K
C53
20P
IC5B
TL074
R138
47K
C54
20P
IC5C
TL074
SGNDVDD
R87 220
R88 220
R96 220
R97 220
R98 220
K7
LED3
LED
LED5
LED6
LED7
C 8
20P
SGND SGND
1
2
3
5
6
7
8
9
10
11
VDD
LED
LED
LED
LED
LED
X1
C 9
8MHz
20P
3
XIN
VPP
P0.0/INT0
P0.1/INT1
P0.2/INT2
RST
P1.5
P1.
P1.3
VDD
P1.2
P1.1
TR9
PNP
XOUT
P1.012P2.013P2.11P2.215P2.316VSS17AVSS18P .7/AIN719P .6/AIN620P .5/AIN521P . /AIN
R58
K7
-20dB
LED
RA0
LED8
-10dB
LED
RA1
LED9
-7dB
LED
RA2
LED10
- dB
LED
RA3
LED11
-2dB
LED
RA
LED12
2
VSS
VDD
R99K7R100
1
TR10
PNP
R140
47K
R145
47K
RB7
RB6
RB5
RB
R101K7R102
K7
K7
3
35
36
37
SGNDSGND
Ch2 Music
R69
33K
1
R70
33K
6
P2.38P2.539P2.60P2.7
2
3
PFL MIX
VR12A
2
13
12
PFL MIX
VR12B
5
R152
180K
C55
20P
20KB
C58
20KB
P5. /TC0/PWM0
P5.1/SI
P5.2/SO
P5.0/SCK
P5.3/TC1/PWM1
22
Left Meter Right Meter
R59
K
0dB
RA0
LED13
2dB
RA1
LED1
dB
RA2
LED15
7dB
RA3
LED16
10dB
RA
LED17
R109
8K2
2
3
R112
8K2 R121
13
12
C74
10u25V
R144
1
C6A
R153
180K
20P
C6D
7K
TL074
R141
47K
R143
47K
3
R142
47K
C75
10u/25V
R 4
1
7K
TL074
R146
7K
R148
47K
R147
47K
P5.5
P5.6
P5.7
DAO
VDD
AVREF
P 0/AIN0
P 1/AIN1
P 2/AIN2
P 3/AIN3
SN8P1707
VDD
LED
LED
LED
LED
LED
D2
R113 56K
D3
C3A
TL074
D11
R116 56K
D12
IC3D
TL07
PFL MODE
PFL MODE
PHONE LINE OUT R2
R122
1K
PHONE LINE OUT R1
R1231KR124
IC9
33
32
31
30
29
28
27
26
25
2
23
TR11
PNP
1 8
1 8
1
1 8
1 8
1
C22
10uF/25V
R150
47K
C23
10uF25V
R151
47K
R89 220
R90 220
R91 220
R92 220
R93 220
R9 220
R95 220
R103 K7
R10 K7 RB2
R105 K7
R106 K7
R60
K7
0dB
RA0
LED18
2dB
RA1
LED19
dB
RA2
LED20
7dB
RA3
LED21
10dB
RA
LED22
D
1 8
D13
1 8
PFL LEVEL
3
VR13A
50KB
PFL LEVEL
6
VR13B
50KB
R125
1K
1K
Q0
Q1
Q2
Q3
Q
Q5
Q6
VDD
C63
10
SGND
VDD
LED
LED
LED
LED
LED
R117
1K
1K
C80
47uF/25V
2
C81
47uF/25V
5
PHONE/LINE OUT L2
PHONE/LINE OUT L1
VDD VDD VDD
RB0
RB1
TR1
PNP
11
Q0
a
7
Q1
b
Q2
c
2
Q3
d
1
Q
e
10
Q5
f
5
Q6
g
3
dp
IC10
LED-7SEG-3
RB3
RB1
RB0
TR12
PNP
C65
1.0uF
SGND
C68
1.0uF
SGND
R9
R154
2K49
12K
C56
20P
6
IC6B
5
TL074
C20
R39
10uF25V
100K
R155
R10
12K
2K49
C57
20P
9
IC6C
10
TL074
C21
R40
10uF25V
100K
R41
100K
RB2
TR2
PNPTRPNP
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
R157
47R
R156
47R
7
R158
47R
R159
47R
8
2
3
VDD
Time Offset Tempo Difference
LED
LED23
LED
LED2
LED
LED25
LED
LED26
LED
LED27
LED
LED28
LED
LED29
R118
1K
C66
1 0uF
SGND
R119
1K
C67
1 0uF
SGND
X3
3c
d
2b
1a
5e
PHONEJACK5 (5-PIN)
PHONE OUT
AMP R AMP L
R129
R130
51K1
51K1
SW3C
SW3A
8
9
P
LEVEL METER
R42
100K
RB3
Q0
Q1
Q2
Q3
Q
Q5
Q6
TR3
PNP
SW3B
P
VDD VDD VDD
RB
TR5
PNP
12
IC11
LED-7SEG-3
Q0
Q1
Q2
Q3
Q
Q5
Q6
5
6
a
b
c
d
e
f
g
dp
1
7
A1
LED30
LED31
LED32
LED33
LED3
LED35
LED36
D7
R11 62K
D8
IC7A
2068
D9
R115 62K
D10
C7B
2068
SW3D
10
11
12
9
A2
LED
LED
LED
LED
LED
LED
LED
1 8
1 8
1 8
1 8
P
11
7
2
1
10
5
3
RB7
D5
1 8
D6
1 8
SW PS 42E85L
R164
R165
2K2
2K2
RB5
TR6
TR8
PNP
PNP
8
A3
VDD
TR7
PNP
R110
2
3
6
5
Left Meter
8K2
R111
R ght MeterCh1 Music
8K2
MAIN
LD1
RED
PFL
LD2
GRN
-15V
D
C
B
A
Titel
DJM2 PRE
Size
Date:
1 2 3 5 6 7 8 9 10 11 12
File:
27 Dec 2002
DJM2 PRE SCH
DJM 2 V1 0A3
Sheet
Drawn By:
RevisionModel No:
11 of
D
C
B
A
C11
100P
C12
100P
V1.0
11 of
J.S.TASY
RevisionModel No:
4321
LINE L2
R17
C22
2K2
10uF/25V
R18
R7
47K
C23
C7
100P
L
LINE (INPUT2)
X2
L
CHANNEL 2
PHONO (INPUT2)
LINE R2
2K2
10uF/25V
CN-RCA2-4PORT
PHONO L2
2K2
R19
R11
R8
47K
C24
10uF/25V
C8
100P
R33
100K
R29
10KC36n8
120R
C34
2
47uF
27n
R
C48
R41
47K
IC5A
4580
R30
10K
6n8C49
C4
3
27n
R42
120R
R10
47K
R
C25
C30
100P
10uF/25V
R34
C35
C27
100K
47uF
R20
10uF/25V
6
PHONO R2
2K2
7
C26
10uF/25V
R12
4580
IC5B
5
R9
C31
47K
47K
100P
-15V
CN3
-15V
+15V
8 4
IC4C
4580
8 4
IC5C
4580
12345
5P-2.5
+5V
+15V +5V
-15V
123456789
CN1
1234567891011
CN2
+15V
DJM2-PU
Titel
AMP L
TAPE R
TAPE L
DJM-2
Size
AMP R
10
Sheet
25-Dec-2002
A4
Date:
10P-2.0
12
12P-2.0
Drawn By:
DJM2-PU.SCH
File:
LINE L1
R13
2K2
R1
47K
C14
100P
10uF/25V
C5
C13
R14
2K2
10uF/25V
L
LINE (INPUT1)
X1
CHANNEL 1
L
PHONO (INPUT1)
LINE R1
R2
47K
C6
R
CN-RCA2-4PORT
R
100P
LINE L1
LINE R1
PHONO R1
PHONO L1
LINE R2
LINE L2
PHONO R2
PHONO L2
PHONO L1
2K2
R15
R5
47K
C19
10uF/25V
1
4580
IC4A
C17
10uF/25V
C2
6n8
R27
10K
3
27n
C47
R40
120R
R3
47K
C28
100P
R31
100K
R28
10K
C1
6n8
120R
C32
2
47uF
C46
27n
R39
R32
C33
100K
47uF
R16
C20
10uF/25V
6
PHONO R1
2K2
7
5
IC4B
4580
C18
R6
47K
R4
47K
10uF/25V
C29
100P
TAPE L
R36
100R
C38
470P
L
X4
CN-RCA2-4PORT
L
C39
470P
AMP ( MAIN OUT) TAPE ( MAIN OUT)
R37
100R
TAPE R
R35
100R
C41
470P
R
R
C40
470P
R38
100R
1 2 3 4
AMP L
D
C
B
AMP R
A
D
C
B
A
V1.0
11 of
J.S.TASY
RevisionModel No:
4321
Drawn By:
Sheet
DJM-3
C15
10uF/25V
-15V
C33
100n
X1
7915
C29
DJM3-PWR
D2
1N4004
D1
DC OUT
1000uF/35V
1N4004
D3
+5V
1N4004
C28
12345
X1
7805
1000uf/35v
C34
CN2
100n
5P-2.5
C16
C32
10uF/25V
470uF/25V
D4
C30
1000uF/35V
1N4004
D5
+15V
1N4004
DJM3-PWR
25-Dec-2002
DJM2-PWR.SCH
A4
Titel
Size
File:
Date:
C21
10uF/25V
C35
100n
X3
7815
C31
1000uF/35V
D6
1N4004
123
3P-3.9
CN1
POWER IN 9V
1 2 3 4
D
C
B
A
4. PRINTED CIRCUIT DIAGRAM
PCB : DJM2-PRE Top Overlay
PCB : DJM2-PRE Bottom Layer
PCB : DJM2-PRE Bottom Overlayer
y
PCB : DJM2-PU Top Laye
r
PCB : DJM2-PU Top Overla
PCB : DJM2-PU Bottom Layer
PCB : DJM2-PU Bottom Overlay
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