Alto APM 120 User manual

ServiceManual
www.altoproaudio.com
Version: .2
Model: AMX-120

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

17
8. TECHNICAL SPECIFICATION
Mono input channels
Stereo input channels
Impedances
Equalization
Microphone input
electronically balanced, discrete input configuration
Frequency response
10Hz to 55kHz, + 3dB
Distortion (THD & N)
0.005% at +4dBu, 1kHz
Gain range 0dB to 44dB (MIC)
SNR (Signal to Noise Ratio)
115dB
Line input
electronically balanced
Frequency response
10Hz to 55kHz, + 3dB
Distortion (THD & N)
0.005% at +4dBu, 1kHz
Sensitivity range
+15dBu to 30dBu
Line input
Unbalanced
Frequency response
10Hz to 55kHz, 3dB
+
Distortion (THD & N)
0.005% at +4dBu, 1kHz
Microphone input
1.4kOhm
Channel Insert return
2.5kOhm
All other inputs
10kOhm or greater
Tape out
1kOhm
All other output
120Ohm
Hi shelving
+ 15dB @12kHz
Mid bell + 12dB @2.5kHz
Low shelving
+ 15dB @80Hz
Low Cut filter
75Hz, 18dB/oct.
Main Mix Section
Noise (Bus noise) Fader 0 dB, channels muted: 100dBr (ref.:+4dBu)
Fader 0dB, all input channels assigned and set to
UNITY gain: 90dBr (ref.:+4dBu)
Max output
+22dBu unbalanced, 1/4" jacks
AUX Sends max out
+22dBu
Power supply (AC/AC Adaptor)
Main voltage
USA/Canada 100 120V~, 60Hz
Europe 210 240V~, 50Hz
U.K./Australia 240V~, 50Hz
Power Consumption
11 watts
Physical
Net weight
1.65Kg (3.65lb)
Shipping weight 2.3Kg (5.11lb)
Dimension (W D H) 208mm 275.5mm 35/43mm
(6.06" 7.81" 1.01"/1.30")

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RevisionModel No:
19-Dec-2003
ALTO MIXING CONSOLE
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AMX-120 BLOCK DIAGRAM VER031216
A2(C)
MONO INPUT CHANNELS ( 1-2 )
2 1 3
MIC IN
+48V
3-BAND EQ
12K2.5K80
SG/OL
LEFT-BUS
RIGHT-BUS
AUX-1
RIGHT-BUS LEFT-BUS
AUX-1
STEREO INPUT CHANNELS (3-10)
LEFT-BUS
RIGHT-BUS
AUX-1
AUX-1 AUX SEND
MAIN OUT
LEFT-BUS
RIGHT-BUS
2
1 3
2TK TO MIX
2
1 3RIGHT-BUS
LEFT-BUS
TAPE IN
RIGHT
2-TRACK
21
3
2TK TO CTRL ROOM
21
3
PHONES OUTPUT
LEFT METER
RIGHT METER
+/-15db
MA N MIX
AUX SEND1
T R S
MAIN MIX LEFT
T R S
MA N MIX RIGHT
T R S
CONTROL ROOM OUTPUT
LEFT
T R S
RIGHT
T R S
PHONES
T R S
& PHONES
CONTROL ROOM
LEFT
TAPE OUT
LEVEL
PAN
PHANTOM
LINE IN
GAIN
-
+
POWER
LO MID HI
1 2 1 2
AUX1
LEVEL
POST
PRE
BALANCE
AUX1
LEVEL
SG/OL
3c 5e 1a 4d 2b
LEFT(MONO)
3c 5e 1a 4d 2b
RIGHT
T
R
S
RN TN
T
R
S
RN TN
-
+
-
+
MIC GAIN:0~60dB LINE IN TRIM:+15dB~-45dB
EFX SEND
EFX SEND
LEFT-BUS
RIGHT-BUS
AUX-1
EFX SEND
1 2 1 2
POST
PRE
2TK IN
LEVEL

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3-Jan-2004 KEVIN LIN.
INPUT STAGE ( CH1-CH4 )
41of
AMX-120 VER031229
A2
EQ HI
12KHZ
C131
18n(M) VR4
B50K
R151
6K8
VR3 B50K
R150
6K8
LO
R47
10K0
C87
47u/25V
5 67
U9B
NJM4580M
R220
1M
C179
22P
R212
1K1
VR5
B50K
R137
1K3
MID
R196
910R
C155
12n(M)
R197 910R
C139
33n(M) C140
33n(M)
C171
12n(M)
C163
18n(M)
C88
47u/25V
VR11
W50K
R228
47K
R248
4K7
C195
2.2u/50V R152
6K8
TR2
BR
TR1
BR
R264
1K5 +VCC
LD1 RED
R236
22K
3 21
U9A
NJM4580M
VR9
W50K
PEAK
C89
47u/25V R256
3K9
R270 36K
C180
22P
C90
47u/25V
R284
5K11
AUX-1
LEVEL
AUX-POST
R287
5K11
R286
5K11
LEFT-BUS
RIGHT-BUS
PAN
PGND
80HZ
2.5K
EQ HI
12KHZ
C132
18n(M) VR7
B50K
R155
6K8
VR6 B50K
R154
6K8
LO
R55
10K0
C94
47u/25V
5 67
U10B
NJM4580M
R221
1M
C181
22P
R213
1K1
VR8
B50K
R139
1K3
MID
R198 910R
C156
12n(M)
R199
910R
C141
33n(M) C142
33n(M)
C172
12n(M)
C164
18n(M)
C95
47u/25V
VR14 W50K
R229
47K
R249
4K7
C196
2.2u/50V R156
6K8
TR4
BR
TR3
BR
R265
1K5 +VCC
LD2 RED
R237
22K
3 21
U10A
NJM4580M
VR12 W50K
PEAK
C96
47u/25V R257
3K9
R271
36K
C183
22P
C98 47u/25V
R288
5K11
AUX-1
LEVEL
AUX-POST
R291
5K11
R290
5K11
LEFT-BUS
RIGHT-BUS
PAN
80HZ
2.5K
AMX-120 AMX-120.S01 AMX-120
AMX-120.S03
J2
POST (PRE)
J1
POST (PRE)
(SOLTON 1K2)用
MIC GAIN=-10~-60dB
LINE IN GAIN=+10~-40dB
VR1 O10K
C1
470P C15
22u/35V R19
11K0
LINE IN1
MIC 1 C21
47u/63V R23
3K6
R15 6K81 1/4W
PH PWR
C3
470P
R16
6K81 1/4W
C22
47u/63V
C4
47P
R20 11K0 R24
3K6
C16
22u/35V
R69 51K1
R68
51K1
C2
470P
2 1 3 4
X1 SMC-6.02
R3
5K11
R4
5K11
C27 22P C28
22P
R26
10K0
R73
27R 1%
C23
1000u/10V
3 21
U1A
NJM4580M
R25
10K0 R27
5K11
C29 22P R28
5K11
C30
22P
C17
47u/25
R5
20K 1%
3c 5e 1a 4d 2b
X3
JY-6351G-02-250
5 67
U1B
NJM4580M
3 21
U5A NJM4580M
R2 4R7
R1
4R7
VR2 O10K
C5
470P
C18
22u/35V R21
11K0
LINE IN2
MIC 2
C24
47u/63V
R29
3K6
R17
6K81 1/4W
PH PWR
C10
470P
R18
6K81 1/4W
C25
47u/63V
C11
47P
R22
11K0 R30
3K6
C19
22u/35V
R386
51K1
R8
51K1
C7
470P
2 1 3 4
X2 SMC-6.02
R10
5K11
R11
5K11
C31 22P
C32
22P
R32
10K0
R74
27R 1%
C26
1000u/10V
3 21
U2A
NJM4580M
R31
10K0 R33
5K11
C33 22P R34
5K11
C34 22P
C20
47u/25
R12
20K 1%
3c 5e 1a 4d 2b
X4
JY-6351G-02-250
5 67
U2B
NJM4580M
3 21
U25A
NJM4580M
R38
4R7
R37 4R7
VR10 W50K
R77
4K7
R78
4K7
VR13 W50K
R79
4K7
R80
4K7
AMX-120 AMX-120.S02
84
U2C
84
U1C
84
U9C
C203 100n
C204 100n
+VCC
-VCC
C205 100n
C206
100n
C299 100n
C300 100n
84
U10C
C301 100n
C302 100n
84
U5C
84
U3C
84
U4C
C287 100n
C288 100n
C289 100n
C290 100n
C291 100n
C292 100n
VR15 W50K
R105
47K
R114
4K7
C106
2.2u/50V R91
6K8
TR6
BR
TR5
BR
R135
1K5 +VCC
LD3 RED
R125
22K 3
21
U4A
NJM4580M
VR19A
W50K
PEAK
C53
47u/25V R141
3K9 R153
36K
C110
22P
C56
47u/25V
R168
8K2
AUX-1
LEVEL
AUX-POST
R169
12K
R170
12K
LEFT-BUS
RIGHT-BUS
BAL
PGND
R40
10K0
R41
10K0
R104
47K
R126
22K 5
67
U4B
NJM4580M
VR19B
W50K
C54
47u/25V R142
3K9
R149
36K
C111
22P
C55
47u/25V
LEVEL
R96 10K0
R95
10K0
3c 5e 1a 4d 2b
X5
JY-6351G-02-250
T
R
S
RN TN
LINE IN 3/4
3c 5e 1a 4d 2b
X6
JY-6351G-02-250
T
R
S
RN TN
LEFT(MONO)
RIGHT
3 21
U3A
NJM4580M
R39
10K0
C9 22P
C51
47u/25V
R14
10K0
C6
22P
R6
10K0
C126
100P
R7
10K0
C127 100P
5 67
U3B
NJM4580M
R36
10K0
C12 22P
C52
47u/25V
R35
10K0
C8
22P
R9
10K0
C128 100P
R13
10K0
C129
100P
R187
20K
R186
20K
J3
POST (PRE)
R112
4K7
R113
4K7
5 67
U5B
NJM4580M
R263
62K
R267
1K3
R273
20K
C208
47u/25V
C198
0.22u/50V
C199
0.22u/50V R269
6K8
LO CUT
SW3A
PS-22E85L
SW3B
PS-22E85L
C200
0.22u/50V
5 67
U25B
NJM4580M
R266
62K
R268
1K3
R274
20K
C209
47u/25V
C201
0.22u/50V
C202
0.22u/50V R272
6K8
LO CUT
SW4A
PS-22E85L
SW4B
PS-22E85L
C207
0.22u/50V
84
U25C
C210 100n
C211 100n
SW5A PS-22E85L SW5B PS-22E85L
R302 1K2 R303 1K2
+4/-10 DB +4/-10 DB
AMX-120 (1/4)
VR20 W50K
UNINSERTED

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RevisionModel No:
3-Jan-2004 KEVIN LIN.
INPUT STAGE ( CH5-CH8)
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AMX-120 VER021229
A2
VR17 W50K
R109
47K
R120
4K7
C108
2.2u/50V R93
6K8
TR10
BR
TR9
BR
R138
1K5 +VCC
LD5 RED
R129
22K 3
21
U20A
NJM4580M
VR23A
W50K
PEAK
C65
47u/25V R145
3K9 R160
36K
C114
22P
C68
47u/25V
R176
8K2
AUX-1
LEVEL
AUX-POST
R174
12K
R175
12K
LEFT-BUS
RIGHT-BUS
BAL
PGND
R63
10K0
R64
10K0
R108
47K
R130
22K 5
67
U20B
NJM4580M
VR23B
W50K
C66
47u/25V R146
3K9
R159
36K
C115
22P
C67
47u/25V
LEVEL
R100 10K0
R99
10K0
3c 5e 1a 4d 2b
X9
JY-6351G-02-250
T
R
S
RN TN
LINE IN 7/8
3c 5e 1a 4d 2b
X10
JY-6351G-02-250
T
R
S
RN TN
LEFT(MONO)
RIGHT
3 21
U18A
NJM4580M
R62
10K0
C40 22P
C63
47u/25V
R59
10K0
C37
22P
R54
10K0
C136
100P
R56
10K0
C137 100P
5 67
U18B
NJM4580M
R61
10K0
C41 22P
C64
47u/25V
R60
10K0
C39
22P
R57
10K0
C138 100P
R58
10K0
C143
100P
R191
20K
R190
20K
J5
POST (PRE)
R118
4K7
R119
4K7
84
U19C
84
U18C
C151 100n
C150 100n
+VCC
-VCC
C153 100n
C152
100n
84
U20C
84
U21C
C154 100n
C157 100n
C158 100n
C159 100n
U18~ U21=NJM4580M
VR16 W50K
R107
47K
R117
4K7
C107
2.2u/50V R92
6K8
TR8
BR
TR7
BR
R136
1K5 +VCC
LD4 RED
R127
22K 3
21
U21A
NJM4580M
VR21A
W50K
PEAK
C58
47u/25V R143
3K9 R157
36K
C112
22P
C60
47u/25V
R172
8K2
AUX-1
LEVEL
AUX-POST
R171
12K
R173
12K
LEFT-BUS
RIGHT-BUS
BAL
PGND
R49
10K0
R50
10K0
R106
47K
R128
22K 5
67
U21B
NJM4580M
VR21B
W50K
C59
47u/25V R144
3K9
R158
36K
C113
22P
C62
47u/25V
LEVEL
R98 10K0
R97
10K0
3c 5e 1a 4d 2b
X7
JY-6351G-02-250
T
R
S
RN TN
LINE IN 5/6
3c 5e 1a 4d 2b
X8
JY-6351G-02-250
T
R
S
RN TN
LEFT(MONO)
RIGHT
3 21
U19A
NJM4580M
R48
10K0
C14 22P
C57
47u/25V
R45
10K0
C13
22P
R42
10K0
C130
100P
R43
10K0
C133 100P
5 67
U19B
NJM4580M
R53
10K0
C35 22P
C61
47u/25V
R52
10K0
C36
22P
R44
10K0
C134 100P
R51
10K0
C135
100P
R188
20K
R189
20K
J4
POST (PRE)
R115
4K7
R116
4K7
SW6A PS-22E85L SW6B PS-22E85L
R304 1K2 R305 1K2
SW7A PS-22E85L SW7B PS-22E85L
R306 1K2 R307 1K2
+4/-10 DB +4/-10 DB +4/-10 DB +4/-10 DB
VR22 W50K VR24 W50K
AMX-120 (2/4)
UNINSERTED UNINSERTED

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RevisionModel No:
3-Jan-2004 KEVIN LIN.
INPUT STAGE ( CH9-CH10)
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AMX-120 VER021229
A2
84
U11C
+VCC
-VCC
84
U12C
C184 100n
C185 100n
C186 100n
C187 100n
U18~ U21=NJM4580M
VR18 W50K
R111
47K
R123
4K7
C109
2.2u/50V R94
6K8
TR12
BR
TR11
BR
R140
1K5 +VCC
LD6 RED
R133
22K 3
21
U12A
NJM4580M
VR28A
W50K
PEAK
C99
47u/25V R147
3K9 R166
36K
C124
22P
C101
47u/25V
R184
8K2
AUX-1
LEVEL
AUX-POST
R183
12K
R185
12K
LEFT-BUS
RIGHT-BUS
BAL
PGND
R86
10K0
R87
10K0
R110
47K
R134
22K 5
67
U12B
NJM4580M
VR28B
W50K
C100
47u/25V R148
3K9
R167
36K
C125
22P
C103
47u/25V
LEVEL
R102 10K0
R101
10K0
3c 5e 1a 4d 2b
X19
JY-6351G-02-250
T
R
S
RN TN
LINE IN 9/10
3c 5e 1a 4d 2b
X20
JY-6351G-02-250
T
R
S
RN TN
LEFT(MONO)
RIGHT
3 21
U11A
NJM4580M
R85
10K0
C48 22P
C97
47u/25V
R84
10K0
C47
22P
R81
10K0
C146
100P
R82
10K0
C147 100P
5 67
U11B
NJM4580M
R90
10K0
C49 22P
C102
47u/25V
R89
10K0
C50
22P
R83
10K0
C148 100P
R88
10K0
C149
100P
R201
20K
R202
20K
J6
POST (PRE)
R121
4K7
R122
4K7
8
914
U8C
LM339
1
6
7
U8B
LM339
1
6
7
U7B
LM339
8
914
U7C
LM339
LD9
GR LD11
GR LD13
GR LD15
GR
R245
120R
R246 110R R252
150R R254
1K R253
820R
+VCC
R251
10R
-VCC
PGND
10
11 13
U8D
LM339
5
42
U8A
LM339
5
42
U7A
LM339
10
11 13
U7D
LM339
LD10 GR LD12
GR LD14
GR LD16
GR
LEFT METER
(-20) (0)
3 21
U6A
NJM4580M
R258
100K
R259
100K C190
47u/25
PGND
TR13
HR
+VCC
D1A
DA204K
D1B
DA204K
TR14
HR
R225 120R
R250 470R
R247
470R
R103
10K0
PGND
5 67
U6B
NJM4580M
R255 100K
R260
100K C191
47u/25
PGND
312
U8E
LM339
312
U7E
LM339
84
U6C
NJM4580M
C182
100n
C178
100n
R243
47R
R242
47R
C104
47u/25V
C105
47u/25V
+VCC
-VCC
PGND
LD7
RED
LD8
GR
R124
4K7
R244
2K
PGND PGND
PH PWR
( 5) ( 18)
PWR ON
PHANTOM
+VCC
R262
10K0
R261
10K0
PGNDPGND
D2 RLS4148
D3 RLS4148
D4 RLS4148
D5 RLS4148
L-METER R-METER
-VCC
SW8A PS-22E85L
R308 1K2
+4/-10 DB
SW8B PS-22E85L
R309 1K2
+4/-10 DB
VR29 W50K
AMX-120 (3/4)
UNINSERTED

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Titel Size File: Date: Drawn By:
Sheet
RevisionModel No:
3-Jan-2004 KEVIN LIN.
STEREO AUX & SENDS & MAIN OUT & 2TK & CTRL R & PHONES
44of
AMX-120 VER031229
A2
C188
100P
C69
47u/25V R203
15K
R131
22K
C189 100P
C75
47u/25V R204
15K
R132
22K
VR26B
W50K
VR26A
W50K
3 21
U13A
NJM4580M
5 67
U13B
NJM4580M
R205
30K
C43
22P
C77
47u/25V
R177
5K11
R206
30K
C44
22P
C78
47u/25V
R180
5K11
5 67
U14B
NJM4580M
3 21
U14A
NJM4580M
R178
5K1
C116
22P
LEFT-BUS
RIGHT-BUS
C117
22P
R179
5K1
C71
47u/25V
C81
47u/25V
5 67
U15B
NJM4580M
3 21
U15A
NJM4580M
R163
30K
C119
22P
R230
3K6
C72
47u/25V
VR25B
W50K
MAIN MIX
VR25A
W50K
R162
30K
C118
22P
R231
3K6
C73
47u/25V
C74
47u/25V
C83
47u/25V
R65 10K0
R72 10K0
R211 120R
3c 5e 1a
4d 2b
X12
JY-6351G-02-250
R210
120R
3c 5e 1a
4d 2b
X15
JY-6351G-02-250
R218 120R
R209
120R
MAIN OUT
LEFT
RIGHT
R232
1K
R233
1K
L(WHITE)
R(RED)
C84
47u/25V
R195
20K 3
21
U16A
NJM4580M
R200
20K
C123
22P
C85
47u/25V
R75
10K0
R182
5K11
C76
47u/25V
R193
20K 5
67
U16B
NJM4580M
R194
20K
C120
22P
C79
47u/25V
R66
10K0
R181
5K11
TAPE IN
1 2 3
SW1A
PS-22E85L
LEFT-BUS
4 5 6
P
SW1B
PS-22E85L
RIGHT-BUS
2TK TO MIX
1 2 3
SW2A
PS-22E85L
R234
27K
2TK TO
3 21
U17A
NJM4580M
VR27A
W50K
C80
47u/25V R238
7K5
R164
36K
C46
22P
C82
47u/25V
R67 10K0
3 21
U23A
BA15218N
5 67
U23B
BA15218N
3c 5e 1a
4d 2b
X18
JY-6351G-02-250
R223 120R
R219
120R
CTRL ROOM OUT
C122
22P
R71
10K0
R216
120R
3c 5e 1a
4d 2b
X16
JY-6351G-02-250
R217
120R
PHONES
R215
120R
R214 120R
4 5 6
P
SW2B
PS-22E85L
R235
27K
5 67
U17B
NJM4580M
VR27B
W50K
C86
47u/25V R239
7K5 R165
36K
C45
22P
C93
47u/25V
R76 10K0
3c 5e 1a
4d 2b
X17
JY-6351G-02-250
3 21
U22A
BA15218N
5 67
U22B
BA15218N
R224 120R
R222
120R
R70
10K0
C121
22P
84
U22C
BA152 8N
84
U23C
BA152 8N
R241
47R
R240
47R
C91
47u/25V
C92
47u/25V
AUX RETURNS
L-METER R-METER
3c 5e 1a
4d 2b
X11
JY-6351G-02-250
AUX SENDS
R208 120R
R207 120R
R192
20K
C70
47u/25V
3 21
U24A
NJM4580M
R161
36K
C42
22P
AUX-1
ROOM
C144 100P
C145
100P
TAPE OUT
MAIN MIX
T
R
S
RN TN
LEFT-BUS
RIGHT-BUS
T
R
S
RN TN
T
R
S
RN TN
LEFT
RIGHT
R226 18K
R227
18K
CONTROL
PHONES/
CTRL ROOM
1 4 2 5
3
6
X21
SCP6873NS3232
LEFT
RIGHT
C176 100n
C177 100n
MOUT-L MOUT-R
LEFT-BUS RIGHT-BUS
AUX-1
84
U17C
84
U16C
+VCC
-VCC
84
U24C
C160 100n
C161 100n
C162 100n
C165 100n
C166 100n
C167 100n
84
U15C
84
U14C
C168 100n
C169 100n
C170 100n
C173 100n
84
U13C
C174 100n
C175 100n
U24= NJM4580M U13~ U17= NJM4580M
EFXRTN-L EFXRTN-R
C233
47u/25V
5 67
U24B
NJM4580M
R46
36K
C38
22P
R322
6K2
VR30 W50K
AUX SENDS
AMX-120 (4/4)
D12
1N4002
D13
1N4002
ZD1 1N5261
C401
47uF/100V
D15
1N4002
D14
1N4002
C402
47uF/100V
TR21
7815A
C408
1000uF/35V
PGND
C403
47u/25V
D16
RLS4148
C409
1000uF/35V C404
47u/25V
D11
RLS4148
C405
100uF/100V
PGND
R441
390K
C407
47uF/100V
R442 10K0
R443
10R
R440
20K
C406
47uF/100V
TR23
TIP122
+VCC
-VCC
PH PWR
TR22
7915A
PHANTOM PWR
(47V 0.5W)
CN1 AC IN SW11
PGND R444
0R0
PHANTOM
SW10
TR20
7805
PGND
+5VD
C400
1000uF/16V
PGNDDGND
R445 0R0
AMX-120 NOT USE

PCB : AMX-120FX Top Overlay

PCB : AMX-120FX Bottom Overlay