Alto LEGACY Series User manual

MODEL: AMX 140FX-USB

CONTENT
1. INTRODUCTION..1
2. TECHNICAL SPECIFICATION..2
3. BLOCK DIAGRAM....................4
4. SCHEMATIC DIAGRAM.5
5. WIRING DIAGRAM.13
6. PCB LAYOUT..14
7. TEST PROCEDURE.....................18
8. EXPLODED VIEW & MECHANICAL PARTS LIST..25
9. BOM..27

1. INTRODUCTION
- 5 MIC input channels with gold plated XLRs and balanced LINE input
- 2 stereo input channels with balanced TRS jacks
- Ultra-low noise discrete MIC pre-amps with +48 Phantom Power
- Extremely high headroom offering more dynamic range
- Balanced inputs for highest signal integrity
- Warm, natural 3-band EQ on each mono channel
- Switch-able Low-cut filter on each mono channel
- Peak LED on each channel
- AUX sends 1/2 per channel for external effects and monitoring
- 4 AUX returns for additional functionality
- 2-Track inputs assignable to main mix, control room/headphone outputs
- Highly accurate 12-segment bar graph meters
- 24 bit digital effects processor with 256 effects (16 presets *16 variations)
- Effect on/off by means of MUTE switch or a footswitch connected to the DFX
FOOTSWITCH
- No software drivers are need with Windows XP and MAC OSX.
- 16 bit 32~48KHz ADC/DAC USB input and output with selectable track
- Adjusts the input sensitivity on each stereo channel
- Performance and excellent noise figures
- Rugged construction ensures long life even under the most demanding conditions.
- Stereo USB Input and output with selectable track
- Manufactured under ISO9001 certified management system.
- 1 -

2. TECHNICAL SPECIFICATION
Mono Input channels
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) 112dB
Line input electronically balanced
Frequency response 10Hz to 55KHz, +/-3dB
Distortion (THD & N) 0.005% at +4dBu, 1KHz
Sensitivity range +15dBu to -30dBu
Stereo input channels
Line input balanced
Frequency response 10Hz to 55KHz, +/-3dB
Distortion (THD & N) 0.005% at +4dBu, 1KHz
Impedances
Microphone input 1.4kOhm
Channel Insert return 2.5kOhm
All other inputs 10kOhm or grater
Tape out 1kOhm
All other output 120Ohm
Equalization
Hi shelving +/-15dB @ 12KHz
Mid bell +/-12dB @2.5KHz
Low shelving +/-15dB @80Hz
Low Cut filter 75Hz, 18dB/oct.
DSP Section
A/D and D/A converters 24 bit
DSP resolution 24 bit
Type of effects Hall, Room, Vocal & Plate REVERBS
Mono & Stereo DELAY (max DELAY TIME 650ms)
Chorus, Flanger & Reverb MODULATIONS
REVERB+DELAY, REVERB+CHOURS
REVERB+FLANGER combinations
Presets 256
Controls 16-position PRESET Selector
16-position VARIATION Selector
PEAK LED
- 2 -

MUTE SWITCH with LED indicator
USB SECTION
ADC/DAC 16 Bit 32~48KHz
Fully Compliant with USB 1.1 specification
No software drivers are need with windows XP or MAC OSX
Main Mix Section
Noise (Bus noise) Fader 0dB, channels muted: -100dBr (ref: +4dBu)
Fader 0dB, all input channels assigned and set to
UNITY gain: -90dBr (ref: +4dBu)
Max output +22dBu balanced XLR
+22dBu unbalanced, 1/4jacks
AUX Returns gain range -∞to +15dB
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 27watts
Physical
Dimension (WDH) 270mm310mm43mm
(10.6312.201.69)
Net weight 2.5Kg (6.61lb)
- 3 -

1 2 3 4 5 6 7 8
A B C D
8
7654321
D C B A
MONO INPUT CHANNELS ( 1-4 )
2 1 3
MIC IN
+48V
3-BAND EQ
12K2.5K80
HI PASS
2
1 3
LO CUT
SG/OL
LEFT-BUS
RIGHT-BUS
AUX-1
AUX-2
RIGHT-BUS LEFT-BUS
AUX-1 AUX-2
STEREO INPUT CHANNELS (5-8)
EQ
12K2.5K80
LEFT-BUS
RIGHT-BUS
AUX-1
AUX-2
LEFT-BUS RIGHT-BUS
STEREO AUX RETURN 2
RIGHT-BUS LEFT-BUS
AUX-1
AUX SEND
AUX-2
MAIN OUT
LEFT-BUS
RIGHT-BUS
2
1 3
2TK TO MIX
2
1 3
RIGHT-BUS LEFT-BUS
TAPE IN
RIGHT
2-TRACK
2
1 3
2TK TO CTRL ROOM
2
1 3
PHONES OUTPUT
LEFT METER
RIGHT METER
75Hz +/-15db
3-BAND EQ
12K2.5K80
+/-15db
3c 5e 1a 4d 2b
LEFT
3c 5e 1a 4d 2b
RIGHT
MAIN MIX
AUX SEND1
T R S
AUX SEND2
T R S
MAIN MIX LEFT
T R S
MAIN 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
2 1 3 2 1 3
LEVEL
AUX RETURN2
STEREO AUX RETURN 1
3c 5e 1a 4d 2b
LEFT(MONO)
3c 5e 1a 4d 2b
RIGHT
AUX RETURN1
-
+
T
R
S
RN TN
T
R
S
RN TN
T
R
S
RN TN
T
R
S
RN TN
PAN
PHANTOM
LINE IN
GAIN
-
+
POWER
-
+
-
+
-
+
LO MID HI
1 2 1 2
AUX1 AUX2
LEVEL
POST
PRE
BALANCE
AUX1
AUX2
LEVEL
LO MID HI
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
-
+
-
+
2 1 3
MIC5 IN
+48V
PHANTOM GAIN
-
+
POWER
CHANNEL 5,6 ONLY
3c 5e 1a 4d 2b
INSERT
T
R
S
RN TN
MIC GAIN:0~60dB LINE IN TRIM:+15dB~-45dB
EFX SEND
DSP BOARD
PRESETS
VARIATIONS
MUTE
DSP FOOTSWITCH
EFX SEND
LEFT-BUS
RIGHT-BUS
AUX-1
AUX-2
EFX SEND
AUX-1
AUX1
2TK IN
LEVEL
USB RECORD
USB PLAYBACK MONO CHANNEL 1
MONO CHANNEL 2
AMX140FX-USB
STEREO CHANNELS 7
STEREO CHANNELS 8
2
1 3
2
1 3
2
1 3
2
1 3
2
1 3
2
1 3
Vin R
ADC
Vin L
Vout L
DAC
Vout R
USB
PROTOCOL
CONTROLLER
USB MODULE
RIGHT-BUS LEFT-BUS MAIN MIX LEFT
MAIN MIX RIGHT
USB PORT TO PC
3. BLOCK DIAGRAM
- 4 -

1 2 3 4 5 6 7 8
A B C D
8
7654321
D C B A
5 6
7
U5B
NJM4580M
R131
62K
R177
20K
C86
47uF/25V
C70
0.22u/50V
C71
0.22u/50V
C72
0.22u/50V
R149
6K8
1 2 3
SW1A
PS-22E85L
4 5 6
P
SW1B
PS-22E85L
LO CUT
3c 5e 1a
4d 2b
X1
JY-6351G-02-250
EQ HI
12KHZ
C131
18n(M)
VR2
B50K
R151
6K8
VR4 B50K
R150
6K8
LO
R47
10K
C87
47uF/25V
5 6
7
U9B
NJM4580M
R220
1M
C179
22P
R212
1K1
VR3
B50K
R137
1K3
MID
R196
910R
C155
12n(M)
R197 910R
C139
33n(M)
C140
33n(M)
C171
12n(M)
C163
18n(M)
C88
47uF/25V
R285
8K06
VR6
W50K
AUX-1
R228
47K
R248
4K7
C195
2.2u/50V R152
6K8
TR2
BR
TR1
BR
R264
1K5 +VCC
LD1 RED
R236
22K
3 2
1
U9A
NJM4580M
VR8
W50K
PEAK
C89
47uF/25V R256
3K9
R270 36K
C180
22P
VR5
W50K
C90
47uF/25V
R284
8K06
AUX-2
LEVEL
AUX-POST
R287
5K1
R286
5K1
LEFT-BUS
RIGHT-BUS
PAN
PGND
AUX-PRE
T
R
S
RN TN
80HZ
2.5K
INSERT1
5 6
7
U6B
NJM4580M
R132
62K
R138
1K3
R179
20K
C93
47uF/25V
C73
0.22u/50V
C74
0.22u/50V
C75
0.22u/50V
R153
6K8
1 2 3
SW2A
PS-22E85L
4 5 6
P
SW2B PS-22E85L
LO CUT
3c 5e 1a
4d 2b
X2
JY-6351G-02-250
EQ HI
12KHZ
C132
18n(M)
VR10
B50K
R155
6K8
VR12 B50K
R154
6K8
LO
R55
10K
C94
47uF/25V
5 6
7
U10B
NJM4580M
R221
1M
C181
22P
R213
1K1
VR11
B50K
R139
1K3
MID
R198 910R
C156
12n(M)
R199
910R
C141
33n(M)
C142
33n(M)
C172
12n(M)
C164
18n(M)
C95
47uF/25V
R289
8K06
VR14 W50K
AUX-1
R229
47K
R249
4K7
C196
2.2u/50V R156
6K8
TR4
BR
TR3
BR
R265
1K5 +VCC
LD2 RED
R237
22K
3 2
1
U10A
NJM4580M
VR16 W50K
PEAK
C96
47uF/25V R257
3K9
R271
36K
C183
22P
VR13
W50K
C98 47uF/25V
R288
8K06
AUX-2
LEVEL
AUX-POST
R291
5K1
R290
5K1
LEFT-BUS
RIGHT-BUS
PAN
PGND
AUX-PRE
T
R
S
RN TN
80HZ
2.5K
INSERT2
5 6
7
U7B
NJM4580M
R133
62K
R140
1K3
R182
20K
C100
47uF/25V
C76
0.22u/50V
C77
0.22u/50V
C78
0.22u/50V
R157
6K8
1 2 3
SW3A
PS-22E85L
4 5 6
P
SW3B
PS-22E85L
LO CUT
3c 5e 1a
4d 2b
X3
JY-6351G-02-250
EQ HI
12KHZ
C133
18n(M)
VR18 B50K
R159
6K8
VR20 B50K
R158
6K8
LO
R63
10K
C101
47uF/25V
5 6
7
U11B
NJM4580M
R222
1M
C182
22P
R214
1K1
VR19
B50K
R141
1K3
MID
R200 910R
C157
12n(M)
R201 910R
C143
33n(M)
C144
33n(M)
C173
12n(M)
C165
18n(M)
C103
47uF/25V
R293
8K06
VR22 W50K
AUX-1
R230
47K
R250
4K7
C197
2.2u/50V R160
6K8
TR6
BR
TR5
BR
R266
1K5 +VCC
LD3 RED
R238
22K
3 2
1
U11A
NJM4580M
VR24 W50K
PEAK
C97
47uF/25V R258
3K9
R272
36K
C184
22P
VR21
W50K
C106 47uF/25V
R292
8K06
AUX-2
LEVEL
AUX-POST
R295
5K1
R294
5K1
LEFT-BUS
RIGHT-BUS
PAN
PGND
AUX-PRE
T
R
S
RN TN
80HZ
2.5K
INSERT3
5 6
7
U8B
NJM4580M
R134
62K
R142
1K3
R183
20K
C108
47uF/25V
C79
0.22u/50V
C80
0.22u/50V
C81
0.22u/50V
R161
6K8
1 2 3
SW4A
PS-22E85L
4 5 6
P
SW4B
PS-22E85L
LO CUT
3c 5e 1a
4d 2b
X4
JY-6351G-02-250
EQ HI
12KHZ
C134
18n(M)
VR26
B50K
R163
6K8
VR28 B50K
R162
6K8
LO
R71 10K
C102
47uF/25V
5 6
7
U12B
NJM4580M
R223
1M
C185
22P
R215
1K1
VR27
B50K
R143
1K3
MID
R202 910R
C158
12n(M)
R203 910R
C145
33n(M)
C146
33n(M)
C174
12n(M)
C166
18n(M)
C104
47uF/25V
R298
8K06
VR30 W50K
AUX-1
R231
47K
R251
4K7
C198
2.2u/50V R164
6K8
TR8
BR
TR7
BR
R267
1K5 +VCC
LD4 RED
R239
22K
3 2
1
U12A
NJM4580M
VR32 W50K
PEAK
C105
47uF/25V R259
3K9
R273
36K
C186
22P
VR29
W50K
C107 47uF/25V
R297
8K06
AUX-2
LEVEL
AUX-POST
R296
5K1
R299
5K1
LEFT-BUS
RIGHT-BUS
AUX-PRE
T
R
S
RN TN
80HZ
2.5K
INSERT4
U1~ U12=
AMX140FX-USB AMX140FX-USB.S01
AMX140FX-USB AMX140FX-USB.S03
J2
POST (PRE)
1 2 3J1
POST (PRE)
J3
POST (PRE)
J4
POST (PRE)
(SOLTON 1K2)
MIC GAIN=-10~-60dB
LINE IN GAIN=+10~-40dB
C319
47uF/25V
C318
47uF/25V
C320
47uF/25V
C321
47uF/25V
VR1 O10K
C1
470P C15
22u/35V
R19 11K0
LINE IN1
MIC 1 C21
47u/50V R23
3K60
R15 6K81 1/4W
PH PWR
C3
470P
R16
6K81 1/4W
C22
47u/50V
C4 47P
R20 11K0 R24
3K60
C16
22u/35V
R69 51.1K
R68
51.1K
C2
470P
2 1 3 4
X5 SMC-6.02
R3
5K11
R4
5K11
C27 22P C28
22P
R26
10K0
R73 27R
C23
1000u/10V
3 2
1
U1A
4580M R25
10K0
R27
5K11
C29 22P
R28
5K11
C30
22P
C17
47uF/25V
R5
20K
3c 5e 1a 4d 2b
X6
JY-6351G-02-250
5 6
7
U1B
4580M
3 2
1
U5A 4580M
R2 47R
R1
47R
VR9 O10K
C5
470P
C18
22u/35V R21
11K0
LINE IN2
MIC 2
C24
47u/50V
R29
3K60
R17
6K81 1/4W
PH PWR
C10
470P
R18
6K81 1/4W
C25
47u/50V
C11
47P
R22
11K0 R30
3K60
C19
22u/35V
R386
51K1
R8
51K1
C7
470P
2 1 3 4
X7 SMC-6.02
R10
5K11
R11
5K11
C31 22P
C32
22P
R32
10K0
R74
27R
C26
1000u/10V
3 2
1
U2A
4580M R31
10K0 R33
5K11
C33 22P
R34
5K11
C34 22P
C20
47uF/25V
R12
20K
3c 5e 1a 4d 2b
X8
JY-6351G-02-250
5 6
7
U2B
4580M
3 2
1
U6A
4580M
R38
47R
R37 47R
VR17 O10K
C6
470P
C38
22u/35V R46
11K0
LINE IN3
MIC 3
C44
47u/50V
R51
3K60
R70
6K81 1/4W
PH PWR
C13
470P
R42
6K81 1/4W
C48
47u/50V
C35 47P
R48
11K0 R53
3K60
C40
22u/35V
R36
51.1K
R35
51.1K
C9
470P
2 1 3 4
X9 SMC-6.02
R64
5K11
R66
5K11
C54 22P
C52
22P
R59
10K0
R56
27R
C50
1000u/10V
3 2
1
U3A
4580M R58
10K0 R62
5K11
C55 22P
R76
5K11
C58 22P
C61
47uF/25V
R84
20K
3c 5e 1a 4d 2b
X10
JY-6351G-02-250
5 6
7
U3B
4580M
3 2
1
U7A
4580M
R7
47R
R6 47R
VR25 O10K
C8
470P
C39
22u/35V R49
11K0
MIC 4
C41
47u/50V
R52
3K60
R43
6K81 1/4W
PH PWR
C12
470P
R45
6K81 1/4W
C49
47u/50V
C36 47P
R50
11K0 R54
3K60
C14
22u/35V
R40
51K1
R387
51K1
C37
470P
2 1 3 4
X11 SMC-6.02
R65
5K11
R83
5K11
C59 22P
C53
22P
R61
10K0
R57
27R
C51
1000u/10V
3 2
1
U4A
4580M R60
10K0 R67
5K11
C57 22P
R75
5K11
C60 22P
C62
47uF/25V
R85
20K
3c 5e 1a 4d 2b
X12
JY-6351G-02-250
5 6
7
U4B
4580M
3 2
1
U8A
4580M
R13
47R
R14 47R
LINE IN4
1
2
3
GND
4
GND
5
VR7 W50K
R77
4K7
R78
4K7
VR15 W50K
R79
4K7
R80
4K7
VR23 W50K
R81
4K7
R82
4K7
PAN
VR31 W50K
R9
4K7
R44
4K7
AMX140FX-USB AMX140FX-USB.S02
84
U2C
84
U8C
84
U1C
84
U9C
84
U6C
C203 100n
C204 100n
+VCC
-VCC
C205 100n
C206
100n
84
U7C
C293 100n
C294 100n
C295 100n
C296 100n
C297 100n
C298 100n
C299 100n
C300 100n
84
U10C
84
U11C
C301 100n
C302 100n
C303 100n
C304 100n
84
U12C
C42 100n
C63 100n
84
U5C
84
U3C
84
U4C
C287 100n
C288 100n
C289 100n
C290 100n
C291 100n
C292 100n
NJM4580M
AMX140FX-USB AMX140FX-USB.S04
R136
1K3
PGND
AMX140FX-USB(1/6)
AMX140FX-USB AMX140FX-USB.S05
CH1 CH2
D5 4148
D2 4148
D3 4148 D4
4148
+VCC -VCC +VCC -VCC
D10 4148
D6 4148
D7 4148 D8
4148
+VCC -VCC +VCC -VCC
D11 4148
D12 4148
D13 4148 D14
4148
+VCC -VCC +VCC -VCC
D16 4148
D15 4148
D17 4148 D18
4148
+VCC -VCC +VCC -VCC
4. SCHEMATIC DIAGRAM
- 5 -

1 2 3 4 5 6 7 8
A B C D
8
7654321
D C B A
3c 5e 1a 4d 2b
X14
JY-6351G-02-250
EQ HI
12KHZ
C135
18n(M)
VR34A
B50K
R167
6K8
VR36A B50K
R166 6K8
LO
R96
10K
C111
47uF/25V
3 2
1
U16A
NJM4580M
R224
1M
C187
22P
R216
1K1
VR35A
B50K
R145
1K3
MID
R204
910R
C159
12n(M)
R205 910R
C147
33n(M)
C148
33n(M)
C175
12n(M)
C167
18n(M)
C112
47uF/25V
R312
2K7
VR38 W50K
AUX-1
R232
47K
R254
4K7
C199
2.2u/50V R170
6K8
TR10
BR
TR9
BR
R268
1K5 +VCC
LD5 RED
R244
22K 3
2
1
U17A
NJM4580M
VR40A
W50K
PEAK
C113
47uF/25V R260
3K9
R281 36K
C188
22P
VR37
W50K
C116
47uF/25V
R313
4K7
AUX-2
LEVEL
AUX-POST
VR39A W50K
VR39B
W50K
R311
5K1
R310
5K1
LEFT-BUS
RIGHT-BUS
BAL
PGND
AUX-PRE
T
R
S
RN TN
80HZ
2.5K
LINE IN 5/6
3c 5e 1a 4d 2b
X15
JY-6351G-02-250
T
R
S
RN TN
LEFT(MONO)
RIGHT
3 2
1
U15A
NJM4580M
R108
10K0
C66
22P
C117
47uF/25V
R105
10K0
C227
22P
R101
18K
C275
100P
R102
18K
C273
100P
5 6
7
U15B
NJM4580M
R109
10K0
C67 22P
C118
47uF/25V
R106
10K0
C228
22P
R103
18K
C276
100P
R104
18K
C274
100P
R107
10K0
R110
10K0
EQ HI
12KHZ
C136
18n(M)
VR34B
B50K
R169
6K8
VR36B B50K
R168
6K8
LO
R111
10K
C119
47uF/25V
5 6
7
U16B
NJM4580M
R225
1M
C190
22P
R217
1K1
VR35B
B50K
R146
1K3
MID
R206 910R
C160
12n(M)
R207 910R
C149
33n(M)
C150
33n(M)
C176
12n(M)
C168
18n(M)
C120
47uF/25V
80HZ 2.5K
R192
20K
R193
20K
R97
10K0
R98
10K0
R233
47K
R245
22K 5
6
7
U17B
NJM4580M
VR40B
W50K
C114
47uF/25V R261
3K9
R280
36K
C189
22P
C115
47uF/25V
LEVEL
R100
10K
R99 10K
EQ HI
12KHZ
C137
18n(M) VR41A
B50K
R172
6K8
VR43A B50K
R171 6K8
LO
R120
10K
C124
47uF/25V
3 2
1
U19A
NJM4580M
R226
1M
C191
22P
R218
1K1
VR42A
B50K
R147
1K3
MID
R208 910R
C161
12n(M)
R209 910R
C151
33n(M)
C152
33n(M)
C177
12n(M)
C169
18n(M)
C127
47uF/25V
R317
2K7
VR45 W50K
AUX-1
R235
47K
R255
4K7
C200
2.2u/50V R173
6K8
TR12
BR
TR11
BR
R269
1K5 +VCC
LD6 RED
R246
22K 3
2
1
U20A
NJM4580M
VR47A
W50K
PEAK
C121
47uF/25V R262
3K9
R283
36K
C192
22P
VR44
W50K
C130
47uF/25V
R314
4K7
AUX-2
LEVEL
AUX-POST
VR46A
W50K
VR46B W50K
R316
5K1
R315
5K1
LEFT-BUS
RIGHT-BUS
BAL
PGND
AUX-PRE
80HZ
2.5K
EQ HI
12KHZ
C138
18n(M) VR41B
B50K
R175
6K8
VR43B
B50K
R174 6K8
LO
R125
10K
C125
47uF/25V
5 6
7
U19B
NJM4580M
R227
1M
C193
22P
R219
1K1
VR42B
B50K
R148
1K3
MID
R210 910R
C162
12n(M)
R211
910R
C153
33n(M)
C154
33n(M)
C178
12n(M)
C170
18n(M)
C126
47uF/25V
80HZ
2.5K
R121
10K0
R122
10K0
R234
47K
R247
22K 5
6
7
U20B
NJM4580M
VR47B
W50K
C128
47uF/25V R263
3K9
R282
36K
C194
22P
C129
47uF/25V
LEVEL
R124 10K
R123
10K
3c 5e 1a 4d 2b
X16
JY-6351G-02-250
T
R
S
RN TN
LINE IN 7/8
3c 5e 1a 4d 2b
X17
JY-6351G-02-250
T
R
S
RN TN
LEFT(MONO)
RIGHT
3 2
1
U18A
NJM4580M
R118
10K0
C68 22P
C122
47uF/25V
R116
10K0
C229
22P
R112
10K0
C279
100P
R113
10K0
C277 100P
5 6
7
U18B
NJM4580M
R119
10K0
C69 22P
C123
47uF/25V
R117
10K0
C230
22P
R114
10K0
C280 100P
R115
10K0
C278
100P
R194
R195
J5
POST (PRE)
J6
POST (PRE)
R190
20K
VR33 O10K
LINE IN5
MIC 5 C91
47u/50V R127
3K60
R91 6K81 1/4W
PH PWR
C82
470P
R72
6K81 1/4W
C92
47u/50V
C83 47P
R126 3K60
2 1 3 4
X13 SMC-6.02
R144 5K11
R135 5K11
C43 22P C110 22P
R129
10K0
R128
27R
C99 1000u/10V
3 2
1
U13A 4580M R130
10K0
R165
5K11
C46 22P
R176
5K11
C47
22P
C56
47uF/25V
5 6
7
U13B 4580M
3 2
1
U14A 4580M
R41 47R
R39
47R
R178
4K7
R180
4K7
R181
4K7
R184
4K7
84
U14C
84
U20C
84
U13C
84
U18C
C65 100n
C64 100n
+VCC
-VCC
C85 100n
C84
100n
84
U19C
C210 100n
C211 100n
C212 100n
C215 100n
C216 100n
C217 100n
84
U17C
84
U15C
84
U16C
C109 100n
C201 100n
C202 100n
C207 100n
C208 100n
C209 100n
U1~ U12= NJM4580M
AMX140FX-USB(2/6)
CH7 CH8
2
1 3
SW14A PS-22E85L
5
4 6
SW14B PS-22E85L
D22 4148
D19 4148
D20 4148 D21
4148
+VCC -VCC +VCC -VCC
R435
20K
R436
20K
C363 47uF/25V C364 47uF/25V
- 6 -

1 2 3 4 5 6 7 8
A B C D
8
7654321
D C B A
3c 5e 1a 4d 2b
X18
JY-6351G-02-250
STEREO AUX
LEFT 1
C265
100P
3c 5e 1a 4d 2b
X19
JY-6351G-02-250
RIGHT 1
C241
47uF/25V R191
8K2
R241
22K
C266 100P
C239
47uF/25V R94
8K2
R240
22K
VR48B
W50K
VR48A
W50K
3 2
1
U21A
NJM4580M
5 6
7
U21B
NJM4580M
R318
56K
C223
22P
C243
47uF/25V
R302
8K2
R320
56K
C269
22P
C245
47uF/25V
R304
8K2
5 6
7
U25B
NJM4580M
3 2
1
U25A
NJM4580M
R300
5K1
C259
22P
LEFT-BUS
RIGHT-BUS
C260
22P
R306
6K34
R305
6K34
R301
5K1
C234
47uF/25V
C233
47uF/25V
5 6
7
U26B
NJM4580M
3 2
1
U26A
NJM4580M
R277
36K
C264
22P
R338
3K6
C235
47uF/25V
VR51B
W50K
MAIN MIX
VR51A
W50K
R276
36K
C263
22P
R339
3K6
C236
47uF/25V
C237
47uF/25V
C238
47uF/25V
R90 10K0
R89 10K0
R329 120R
3c 5e 1a
4d 2b
X24
JY-6351G-02-250
R327
120R
3c 5e 1a
4d 2b
X25
JY-6351G-02-250
R328 120R
R326
120R
MAIN OUT
(BALANCED)
LEFT
RIGHT
12
R342
1K
R343
1K
L(WHITE)
R(RED)
C251
47uF/25V
R188
20K
3 2
1
U23A
NJM4580M
R189
20K
C282
22P
C252
47uF/25V
R385
10K0
R309
5K1
C246
47uF/25V
R186
20K
5 6
7
U23B
NJM4580M
R187
20K
C281
22P
C248
47uF/25V
R381
10K0
R308
5K1
TAPE IN
1 2 3
SW9A
PS-22E85L
LEFT-BUS
4 5 6
P
SW9B
PS-22E85L
RIGHT-BUS
2TK TO MIX
1 2 3
SW10A
PS-22E85L
R348
27K
2TK TO
3 2
1
U27A
NJM4580M
VR50B
W50K
C249
47uF/25V
R344
7K5
R278
36K
C225
22P
C250
47uF/25V
R382 10K0 3
2
1
U29A
BA15218N
5 6
7
U29B
BA15218N
3c 5e 1a
4d 2b
X29
JY-6351G-02-250
R337 120R
R333
120R
CTRL ROOM OUT
C262
22P
R384
10K0
R332
120R
3c 5e 1a
4d 2b
X28
JY-6351G-02-250
R334
120R
PHONES
R331
120R
R330 120R
4 5 6
P
SW10B
PS-22E85L
R349
27K
5 6
7
U27B
NJM4580M
VR50A
W50K
C255
47uF/25V R345
7K5 R279
36K
C226
22P
C256
47uF/25V
R86 10K0
3c 5e 1a
4d 2b
X30
JY-6351G-02-250
3 2
1
U28A
BA15218N
5 6
7
U28B
BA15218N
R336 120R
R335
120R
R383
10K0
C261
22P
84
U28C
BA15218N
84
U29C
BA15218N
R347
47R
R346
47R
C253
47uF/25V
C254
47uF/25V
AUX RETURN 1
L-METER R-METER
R340 10K0 R341 10K0
3c 5e 1a
4d 2b
X22
JY-6351G-02-250
AUX SEND1
R324 120R
R323 120R
R88
20K
C231
47uF/25V
3 2
1
U24A
NJM4580M
R275
43K
C222
22P
AUX-1
3c 5e 1a
4d 2b
X23
JY-6351G-02-250
AUX SEND2
R322
120R
R325
120R
R185
20K
C232
47uF/25V
5 6
7
U24B
NJM4580M
R274
43K
C221
22P
AUX-2
ROOM
C271 100P
C272
100P
TAPE OUT
MAIN MIX
AUX-1
T
R
S
RN TN
T
R
S
RN TN
LEFT-BUS
RIGHT-BUS
T
R
S
RN TN
T
R
S
RN TN
LEFT
RIGHT
R388 30K
R389
30K
CONTROL
PHONES/
CTRL ROOM
RETURN2
STEREO AUX
RETURN1
C267 100P
C242
47uF/25V R92
10K0 R242
62K
C268
100P
C240
47uF/25V R95
10K0
R243 62K
VR49B
W50K
VR49A
W50K
3 2
1
U22A
NJM4580M
5 6
7
U22B
NJM4580M
R319
10K0
C224
22P
C244
47uF/25V
R321
10K0
C270
22P
C247
47uF/25V
AUX RETURN 2
3c 5e 1a 4d 2b
X20
JY-6351G-02-250
3c 5e 1a 4d 2b
X21
JY-6351G-02-250
RIGHT 2
LEFT 2
5 6
7
U31B 4580M
R390 8K66
R438 10K0
R395 22K
C326
33P
3 2
1
U31A 4580M
C328
47uF/25V
C45
47uF/25V
2 1 3
X26 JY-5030-030G
2 1 3
X27
JY-5030-030G
1 4 2 5
3
6
X31
SCP6873NS3232
R380 15K0
R396 22K
R391 11K0
R379
68R0
5 6
7
U32B 4580M
R376 8K66
R394 11K0
R377 22K
C327 33P
3 2
1
U32A 4580M
C285
47uF/25V
C286 47uF/25V
R375 15K0
R378 22K
R393 68R0
R93 68R0
MAIN OUT
LEFT
RIGHT
LEFT
RIGHT
C313 100n
C314 100n
MOUT-L MOUT-R
LEFT-BUS RIGHT-BUS
AUX-1 AUX-2
(MONO / MASTER)
84
U25C
84
U26C
84
U23C
+VCC
-VCC
84
U24C
C306 100n
C307 100n
C308 100n
C309 100n
C310 100n
C311 100n
C312 100n
C315 100n
84
U27C
84
U31C
C316 100n
C317 100n
C322 100n
C323 100n
84
U32C
C324 100n
C325 100n
84
U22C
84
U21C
C218 100n
C219 100n
C220 100n
C305 100n
U21~ U27= NJM4580M U31~ U32= NJM4580M
AUX SEND1 AUX SEND2
EFXRTN-L
EFXRTN-R
3 2
1
U50A
NJM4580M
5 6
7
U50B
NJM4580M
R433
16K5
C356
22P
C360
47uF/25V
R434
16K5
C357
22P
C361
47uF/25V
VR52 W50K
84
U50C
4580M
C354 100n
C355 100n
R432 5K1
R307 3K9
C359
47uF/25V
R303 3K9
C358
47uF/25V
R371 R372
VR53A W50K VR53B W50K
AMX140FX-USB(3/6)
MAINL MAINR
C368
33P
R451 15K0
R392 68R0
C367
33P
R450 18K
C366 33P
R449 18K
R439
10K0
R437
10K0
C369
33P
R447 18K
C365 33P
R448 18K
C370
33P
R452 15K0
R446 10K0
- 7 -

1 2 3 4
A B C D
4
321
D
C B A
8
9
14
U35C
LM339
1
6
7
U35B
LM339
1
6
7
U38B
LM339
8
9
14
U38C
LM339
8
9
14
U36C
LM339
1
6
7
U36B
LM339
1
6
7
U39B
LM339
8
9
14
U39C
LM339
LD10
GR LD11
GR LD12
GR LD13
GR LD14
GR LD15
GR LD16
GR LD17
GR
R350
120R
R355 120R
R356 470R
R359 330R
R357 470R
R360 330R
R358 470R
R361 510R
R362 620R
+VCC
R354
56R
-VCC
PGND
10
11
13
U35D
LM339
5
4
2
U35A
LM339
5
4
2
U38A
LM339
10
11
13
U38D
LM339
10
11
13
U36D
LM339
5
4
2
U36A
LM339
5
4
2
U39A
LM339
10
11
13
U39D
LM339
LD22 GR
LD23 GR
LD24 GR
LD25 GR
LD26 GR
LD27 GR
LD28 GR
LD29 GR
-VCC
LEFT METER
(-30) (-20) (-10) (-7) (-4) (-2) (0) (+2)
3 2
1
U30A 4580M
R367
100K
R369
100K C283
47uF/25V
PGND
10
11
13
U37D
LM339
5
4
2
U37A
LM339
5
4
2
U40A
LM339
10
11
13
U40D
LM339
LD30 GR
LD31 GR
LD32 YEL
LD33 RED
8
9
14
U37C
LM339
1
6
7
U37B
LM339
1
6
7
U40B
LM339
8
9
14
U40C
LM339
LD18
GR LD19
GR LD20
YEL LD21
RED
R363 1K3
R364 2K
R365 5K6
R366
22K
TR13
HR
+VCC
D1A
DA204K
D1B
DA204K
TR14
HR
R353 120R
R351 470R
R352
470R
R87
10K
PGND
5 6
7
U30B
4580M
R368 100K
R370
100K C284
47uF/25V
PGND
312
U36E
LM339
312
U37E
LM339
312
U35E
LM339
312
U38E
LM339
312
U39E
LM339
84
U30C
4580M
C213
100n
C214
100n
R373
47R
R374
47R
C257
47uF/25V
C258
47uF/25V
+VCC
-VCC
PGND
LD8
RED
LD7
GR
R253
4K7
R252
820R
PGND
PGND
PH PWE-LED
(+4) (+7) (+10) (+18)
PWR ON
PHANTOM
+VCC
312
U40E
LM339
R428
10K
R427
10K
PGNDPGND
D30 4148
D31 4148
D32 4148
D33 4148
L-METER R-METER
AMX140FX-USB(4/6)
TR15 BR
R399
47K
+VCC
C413
47uF/25V
C412
47uF/25V
PGND
- 8 -

1 2 3 4 5 6 7 8
A B C D
8
7654321
D
C B A
C342
4.7uF
3
5
7
RL1B RY-5W-K
4
6
8
RL1C RY-5W-K
EFXRTN-L EFXRTN-R
EFXRTN-L EFXRTN-R
AUX SEND2
12 34 56 78 910
1112 1314 1516
CN6
HEADER 8X2 1
2 3 4
COM
EN2
SDB161PVB15FS
1 2 3 4
COM
EN1
SDB161PVB15FS
1 2
3 4
5 6
7 8
AR1 680R*4
1 2
3 4
5 6
7 8
AR2 680R*4
C344
4.7uF
DGND
DGND
+5VD
+5VD
R429
220R
R430
220R
DGND
(MUTE)
C343
4.7uF
LD54 RED
(MUTE) (MUTE)
1 2 4 8
12
RL1A
RY-5W-K
1
+5VD
2 4
C335
100N
8
D9
RLS4148
+VCC
PEAK(FLICKER) MUTE(GLOW)
PRESETVARIATION
EFX-SEED
3c 5e 1a
4d 2b
X32
JY-6351G-02-250
FOOTSWITCH
1 2 3
SW11A
PS-22E85L
10K CHANGE TO 3K3
NetU49_1
NetTR16_C
NetLD54_2
NetC342_1 NetC344_1
NetC343_1
NetR400_2 NetR408_2 NetC332_2 NetCN6_16
A
2K1
D40
1N4002
D41
1N4002
ZD1 1N5261
C401
100uF/100V
D45
1N4002
D44
1N4002
C402
100uF/100V
TR21
7815A
C408
1500uF/25V
PGND
C403 220u/25V
D42
RLS4148
C409
1500uF/25V
C404
220u/25V
D43 RLS4148
C405
100uF/100V
PGND
R441
390K
C407
100uF/100V
R442 47K
R443
4R7
R440
20K
C406
47uF/100V
TR23
TIP122
+VCC
-VCC
TR22
7915A
PHANTOM PWR
(47V 0.5W)
CN5 AC IN SW5
PGND
PHANTOM
SW6
TR20
7805
PGND
+5VD
C400
1000uF/16V
PGNDDGND
R445 0R0
DSP
JP1
PGND
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
CN2 Z-DSP
GND +VCC -VCC NetC342_1 NetC344_1 NetTR16_C +5VD NetCN6_16 NetU49_1 NetC343_1 PGND DGND NetLD54_2 NetC332_2 NetR408_2 NetR400_2
AMX140FX-USB(5/6)
PH PWR
R421 100K
PH PWE-LED
C372 470uF/35V
C371 470uF/35V
R458 10K
TR18 3904
DGND DGND
TR19
3906
R457 10K
DGND DGND
R459 47K
C373 330uF/16V
+5VD
TR17
3904
R456 20K
R460
470R
DGND DGND
D24 5817 D23 5817
- 9 -

1 2 3 4
A B C D
4
321
D
C B A
2
1 3SW12A
SW-2WAY
R411
27K
R400 27K
GND
R398 3K
C330 22P
3 2
1
U51A 4580M
R404 3K
C332 22P
5 6
7
U51B 4580M
GND
5
4 6SW12B
SW-2WAY
3 2
1
U52A 4580M
C350 47uF/25V
R405 28K0
C333 150P
GND
5 6
7
U52B 4580M
C352 47uF/25V
R408 28K0
C337 150P
R407
0R
GND
USB RECORD
USB PLAYBACK
GND
R397 3K C329 22P
3 2
1
U53A 4580M
R402 3K
C331 22P
5 6
7
U53B 4580M
GND
R413
27K
R401
27K
3 2
1
U54A 4580M
R403 28K0
C334 22P
GND
R414
2K67
R409
0R
5 6
7
U54B 4580M
R406 28K0
C336 22P
GND
R415
2K67
C349 47uF/25V C351 47uF/25V
CH7 CH8
LEFT-BUS
RIGHT-BUS
MAINL MAINR
CH1 CH2
VINR
VOUTL VOUTR
VINL
R410
28K0
R412
28K0
R416
0R
R418
3K
R417
0R
R419
3K
2
1 3SW13A
SW-2WAY
5
4 6SW13B
SW-2WAY
GND
+VCC
-VCC
C338 100n C345 100n
C339 100n C346 100n
84
U51C 4580M
84
U52C 4580M
C340 100n C347 100n
C341 100n C348 100n
84
U53C 4580M
84
U54C 4580M
1 2 3 4 5 6 7 8 9
10 11 12 13 14
CN3 USB MIXER
+5VD USB_GND
D- D+ VINL VINR VOUTL VOUTR
1 2 3 4
CN4 USB B TYPE
USB_GND
D- D+
AMX140FX-USB (6/6)
VINL VINR VOUTL VOUTR VOUTL
VOUTR
VINR
VINL
NEW
R425
10K0
R431
10K0
R424 28K0 R426 28K0
GND GND
GND
R455
15R
R420 3K
GND
R422
3K
GND
C410 470P C411 470P
- 10 -

1 2 3 4 5 6 7 8
A B C D
8
7654321
D C B A
C329 22P
C345
1.5nF 2.5%
5 6
7
U44B
4580M
R399 10K
R420 100R
R422
3K3 R397
10K
R398
10K
3 2
1
U44A
4580M
R400
10K
C331 22P
C347
1.5nF 2.5%
5 6
7
U45B
4580M
R406 10K
R421 100R
R423 3K3 R402
10K
R405
10K
3 2
1
U45A
4580M
R408
10K
5 6
7
U46B
4580M
3 2
1
U46A
4580M
C346
1.5nF 2.5%
R404 10K
R403 10K
C332 22P
R407 10K
C330
22P
R424 2K2
R401 10K
(MUTE) (MUTE)
CLK 4
J2
S
5
R
1
Q
6
Q
7K3
U48A 74HC109
+5VD R413
10K
D7 BAS316
12
U49A 74HC14
C352 1uF
DGND
+5VD
R414 10K
D15
BAS316
C353 1uF
DGND
R410 10K
R426 220R
R419 7K5
84
U44C
4580M
84
U46C
4580M
84
U45C
4580M
C336 100N
C337 100N
C338 100N
C339
100N
+VCC
-VCC
3 4
U49B 74HC14
5 6
U49C 74HC14
8 9
U49D
74HC14
12 13
U49F
74HC14
147
U49G
74HC14
DGND
CLK 12
J14
S
11
R
15
Q
10
Q
9K13
U48B 74HC109
DGND
168
U48C
74HC109 C341
100N
C340
100N
+5VD
DGND
C351 10uF
DSP-PRE
DGND
3 2
1
U47A
LM393
5 6
7
U47B LM393
R416 4K7
+VCC
R418 1K
C334 100N
R417 1M R425
2M2
R431 820K
D10A
RB400D
PEAK(FLICKER) MUTE(GLOW)
84
U47C
LM393
TR17 3904
DGND
R411
10K
R412 10K
DGND
OUT
3RS 4
TG 2 TH 6
CTR
5
DS
7
U43A NE555
C333
100N
DGND
+5VD
R415 47K
C350 10uF
DGND
81
U43B
NE555
C349 33P C348 33P
D16 DA202K
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16
CN1 CN1-2.0-16P
GND +VCC -VCC NetC342_1 NetC344_1 NetTR16_C +5VD NetCN6_16 NetU49_1 NetC343_1 PGND DGND NetLD54_2 NetC332_2 NetR408_2 NetR400_2
ZD1 2.4V ZD2
2.4V
R409 10K
TR16
3904
DGNDDGND
R1 0R
- 11 -

1 2 3 4
A B C D
4
321
D
C B A
AMX-USB
D+
1
D-
2
VBUS
3
DGND
4
HID0
5
HID1
6
HID2
7
SEL0
8
SEL1
9
VCCCI
10
AGNDC
11
VINL
12
VINR
13
VCOM
14 VOUTR 15
VOUTL 16 VCCP1I 17 AGNDP 18 VCCP2I 19
XTO 20
XTI 21
AGNDX 22
VCCXI 23
DIN 24
DOUT 25
DGND 26
VDDI 27
SSPDN 28
U1 PCM2902
1 2R4 22
R3 22
R5 1K5
USB_GND
DGND
C6 10uF C5 10uF
AGND
C4 10uF C3 10uF
C13 1uF
C12 1uF C11 1uF
X1
12MHz
C8 22P
DGND DGND
C9 22P
C10 1uF
DGND
DGND
C2 10uF C1 10uF
C7
100uF
R2 0R
+5V
USB_GND
R6 10M
1 2 3 4 5 6 7 8 9
10 11 12 13 14
CN1 CON14
AGND DGND USB_GND
D- D+ VINL VINR VOUTL VOUTR
+5V
TR1 A1117
C34 0.1uF
R26 3K16 R1 1K82
3.6V~3.8V
DGND
R7 10R
- 12 -

1 2 3 4 5 6 7 8
A B C D
8
7654321
D
C B A
AMX-140FX USB
SW6
18VAC~
TG00203
230V/50Hz-AC18V
PCB AMX140FX-USB
SW5
AC IN
1200mA-EI48
5. WIRING DIAGRAM
- 13 -

6. PCB LAYOUT
- 14 -

- 15 -

- 16 -

- 17 -

7. TEST PROCEDURE
1. Instruments:
1). AP (Audio Precision)
2). Dual oscillograph
3). Voltmeter
4). USB line
2. Instruments Setting:
1). AP output: 0dBu 1KHz SINE waveform, Load out 40ΩBal-Gnd or Load out 20Ω
UnbalGnd.
2). AP input: Load 100kΩBNC-Float or Load 100KΩXLR-Bal
BW: 22Hz~22KHz. Fltr: A-Weighting (1207):
3. Visual Check: check the surface of AMX-140FX USB is OK; and be sure the
potentiometer knob has no frication.
4. Functional Test:
1). After the surface testing is OK, input proper AC power voltage, open the main power
switch, POWER led will light up (green). Then open the PHANTOM switch, the
PHANTOM led will light up (red), it has 46V (±2V) PHANTOM voltage of the second
and third pin on each MIC {MIC1, MIC2, MIC3, MIC4, MIC (MONO)} which had been
tested by voltmeter. At last, close the switch (Note: we should close this switch, or the
instruments will be damaged).
2). Adjust all the TRIM knob to min, the LEVEL, EQ, AUX knob to 0, and the PAN to mid,
turn all the keys to OFF.
3). Connect the balanced input to MIC {MIC1, MIC2, MIC3, MIC4, MIC (MONO)}, connect
- 18 -