Alto VOICE-PLUS Schematic
Service Manual
Model: VOICE plus
MIC PREAMPLIFIER/VOICE PROCESSOR
www.altoproaudio.com
Version: 1.1
CONTENTS
1
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
ALTO VOICE
1. Specification
2
SPECIFICATIONS
FREQUENCY RESPONSE
DISTORTION
LINE->INS SEND <0.01% /0DB/UNITY
NOISE
RECORDING OUT -100DBu
INPUT LEVEL(MAX)
LINE IN TO MAIN OUT 10HZ TO 50KHZ:+0/-2DB
MIC->INS SEND <0.01% /-30DBu/30DB GAIN
MAIN OUT BAL -88DBu
MIC IN +11.7DBu
LINE IN +22.7DBu
OUTPUT LEVEL(MAX)
MAIN OUT BAL +22Dbu
MAIN OUT UNBAL +22DBu
RECORDING +22DBu
INSERT SEND +22DBu
POWER SUPPLY
U.K./AUSTRALIA 240V~,50HZ
EUROPE 230V~,50HZ
MAINS VOLTAGE U.S./CANADA 120V~,60HZ
GENERAL EXPORT MODEL 95-120V~,200-245V,50-60HZ
POWER CONNECTOR 10W MAX
FUSE 100-120V:315mA
200-240V:250mA
D
2.Black Diagram
3
6
C
B
A
REC-OUT
CN-BAL-FEMALE
213
4
54321
BALACE
123
123
PASS/EQ
ABSENCE
123
BREATH PRESENCE WRAMTHTUNING
-8db~8db -12db~8db -12db~8db130HZ~720HZ
PASS/DE-ESSER
-20db~5db
2.7KHZ~12KHZ
ABSENCE
CUT FREQUENCY
MAIN-OUT
213
3c5e1a
4d
2b
4
BALACE
8
-- ~ 10db
MASTER VOL
BLACK CHART
123
123
PASS/INV
INV
123
MIC/LINE
-12db~12db
10db~60db
213
4
MIC-INPUT
D
123
PASS/COMPRESSORA
PASS/LOW-CUT
LOW-CUT
15HZ~360HZ
+48V
123
PHANTOM
3c5e1a4d2b
LINE-INPUT
C
3c5e1a4d2b
RETURN
-20db~20db
EXPANDER COMPRESSOR
3c5e1a4d2b
SEND
ATTACK RELEASE
1 2 3 4 56
B
A
B
3. Schematic Diagram
4
EQ_OUT
MAIN_OUT
+15V-15V
123456789
J2
123456789
6
R49
20K0
J1
+48V
MIC_IN+
MIC_IN-
10
CON10
10
CON10
LINE_IN-
LINE_IN+
INSERT_SEND
INSERT_RET
INPUT_LEVEL
C108
1u/50V
R140
1K00
D3
1N4148
R137
D1
1N4148
7
47K5
U31B
4580
D2
1N4148
6
R136
47K5
47u/25V
R92
4K75
10K0
4580
R11
C84
20P
A5K
3
C83
100u/16V
R60
1K50
10K0
4580
R7
C7
47P
C6
47P
R4
10K0
C136
100P
456
P
SW1B
LINE
LINE
COMPRESSOR_IN
R128
47K5
C94
47u/25V
7
3K24
R125
R133
4580
C12
47P
5
6
R126
12K7
R129
2K67
U4B
SW_LED1
GR
101112
GR
456
YEL
456
R82
R68
20K0
47u/25V
4580
R13
C10
47P
10K0
INPUT_GAIN
A5K
R54
6
C81
470P
C5
330P
R32
C
C89
47u/25V
1
P
LINE
LOW_CUT FRE
U4A
4580
3
2
2
VR2A
C500K
1
P
INV
R89
P
LOW_CUT
R85
1M00
R90
3
C100
22N
20K0
C99
22N
R52
470K 5%
123
SW4A
2M00
C131
C88
47u/25V
1
47K5
R34
47P
U2A
4580
R71
3
2
R51
470K 5%
R50
470K 5%
47K5
123
R48
SW3A
SW1C
C137
789
INV
47u/25V
P
LINE
10K0
C11
47P
LOW_CUT FRE
VR2B
C500K
5
20K0
4
R53
470K 5%
LOW_CUT
470K 5%
C86
1
U1A
3
R10
10K0
7
4580
4k22
R59
U3B
5
C82
1000u/16V
10R
C9
47P
6
2
VR1A
1
INPUT_GAIN
2
R8
10K0
7
U1B
R6
10K0
C4
47u/63V
6K81
R30
10R
C134
100P
C135
100P
5
R2
123
6
10K0R310K0
SW1A
D
-15V
8
LED1
RED
LED4
GR
+15V
R94
14K0
5
42U32A
LM339
R91
13K3
1
LED6
SW1D
LED5
SW3B
67U32B
7654321
LED3
GR
LM339
R88
6K34
LED13
SW4B
8
914U32C
LM339
R84
LED2
GR
R83
1M00
TR2
HR
R78
2M00
+15V
1113U32D
R79
1K5
INPUT_LEVEL
1K80
10
LM339
R80
402R
TR3
HR
R81
1K5
+15V
C87
7
U2B
5
+15V
2K00
R64
LED18
RED
SW2B
456
1
2
P
PHANTOM
C15
104P
R47
470K 5%
4580
3
R46
C14
104P
R9
10K0
1
U3A
3
2
470K 5%
R5
C3
47u/63V
R29
10R
C133
100P
R242
20K
123
PASS_LED
R55
220K
U31A
R33
47K5
SW2A
6
R12
4580
R58
4k22
C8
47P
5
VR1B
4
10K0
6K81
R31
PHANTOM
+48V
A
VER030217
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C.C.LIN
RevisionModel No:
OUTPUT
VOICEFP_OUTPUT.SCH
EQ
VOICEFP_EQ.SCH
Titel
COMPRESSOR
VOICEFP_COMPRESSOR.SCH
C27
104P
C28
C25
104P
C26
C23
104P
C24
C21
104P
C22
+15V
U3C
4580
U2C
4580
U1C
4580
5
U4C
4580
R134
22R 5%
U31C
4580
U32E
LM339
312
C19
104P
C20
C18
C17
104P
Drawn By:
Sheet
ALTO VOICE
17-Jul-2003
ALTO VOICE PCBFP-1.Sch
ALTO : ALTO VOICE FP BOARD (INPUT)
A4
Size
File:
Date:
104P
104P
104P
104P
-15V
4 8
4 8
4 8
4 8
4 8
104P
104P
15K0
R127
47K5
R115
100R
D
MIC_IN+
MIC_IN-
LINE_IN-
LINE_IN+
C
B
INSERT_RET
INSERT_SEND
1 2 3 4 5 6 78
A
-15v
5
C71
104P
C69
104P
C67
104P
C65
104P
C63
104P
U30E
LM339
312
U29E
LM339
312
U28E
LM339
312
U27E
LM339
312
U26C
4580
R135
22R0
U23C
+15V
U24E
TL064
411
U22C
4580
U21C
4580
U20C
4580
U19C
4580
U18C
4580
U17C
4580
U16C
4580
U14C
4580
A
C72
104P
C70
104P
C68
104P
C66
104P
C64
104P
4 8
4580
4 8
-15V
4 8
4 8
4 8
4 8
+15V
4 8
4 8
4 8
4 8
VER030217
42of
C.C.LIN
RevisionModel No:
Drawn By:
Sheet
ALTO VOICE
17-Jul-2003
ALTO VOICE PCBFP-2.Sch
ALTO : ALTO VOI CE FP BOARD ( COMPRESSOR)
A4
Titel
Size
File:
Date:
C59
104P
C60
104P
C57
104P
C58
104P
C55
104P
C56
104P
C53
104P
C54
104P
-15V
C51
104P
C52
104P
C49
104P
C50
104P
C47
104P
C48
104P
C45
104P
C46
104P
C43
104P
C44
104P
C41
104P
C42
104P
1 2 3 4 5 6 78
D
30K0
R187
8
CH1
R181
TR9
1.8K 1/4W
OUTPUT LEVEL(dB)
R183
15K0
+15V +15V
TR8
7654321
R180
1.8K 1/4W
CH1
GAIN REDUCTION(dB)
SW_LED2
LED10
GR
123
P
SW8A
BYPASS
LED9
GR
456
SW7B
SW_LED1
101112
P
P
INTERACTIVE
SW7D
INTERACTIVE
U19A
D4
R158
C13
47P
+15V
OUT
U15
THAT2150
SYM
EC-
EC+
73
GND
V+
-IN
+15V
18
R151
12K1
C113
47uF/25V
COMPRESSOR_IN
COMP-LEVEL
C109
1u/50V
R141
1K00
D6
1N4148
1
R139
47K5
U26A
4580
D5
1N4148
1N4148
3
2
R138
47K5
R93
4K75
C114
47uF/25V
7
12K1
U14B
4580
5
6
VR14
50K
-15V
R155
301K
R154
47R0
624
5
V-
-15V
R74
4K70
R150
1K00
U14A
R148
VR10
1
+15V
OUTPUT GAIN
COMPRESSOR/LIMITER
1
VR17
A50K
ATTACK
3
R165
17K4
RATIO n:1
COMPRESSOR/LIMITER
789
SW7C
COMPRESSOR/LIMITER
7
U26B
4580
5
1
R144
200R
4580
D16
4148
3
2
130K
R143
200R
2
B50K
3
-15V
C
R188
47K5
LED27
13
U29D
LM339
HR
10
11
R186
56R 5%
R182
39K 5%
LED26
2
U27A
LM339
HR
5
4
R67
R66
1K50
C117
20K0
R69
C120
39K 5%
R169
C119
D20
4148
1
+15V
4580
C116
2.2uF
3
2
R145
200R
R18
10K0
47K5
R40
7
2
R39
47K5
U18B
4580
5
6
1
D19
4148
U18A
3
2
1K00
R113
C115
220N(MEF)
2
R152
1
VR12
B50K
D17
P
INTERACTIVE
10K0
R17
1
2
+15V
2
VR11
B50K
390K 5%
R156
THRESHOLD
3
-15V
COMP-REDUCTION
R38
39K2
R112
2M21
6
R37
1K
LED29GNLED30GNLED31
GN
LED28
GN
1
14
U29B
LM339
U29C
LM339
9
R116
RD
U27B
LM339
7
2K70
2.2uF
U29A
6
7
8
R185
R147
68R
120R 5%
LED24RDLED25
RD
1
14
U27C
LM339
U27D
8
9
6
R178
7K50
R173
6K34
R146
200R
3.3uF
TR7
HR
0.22uF
R153
12K1
R168
470R 5%
VR15
A50K
RELEASE
TR6
HR
COMPRESSOR/LIMITER
1
THRESHOLD
U17A
4580
4580
3
2
7
12K1
3
R160
U16B
4580
5
6
R56
220K
R159
4148
1
U16A
4580
3
-15V
R157
1M50
COMPRESSOR_OUT
-15V
R149
1K15
456
P
SW8B
BYPASS
GN
LED32YELED33YELED34
2
13
LM339
U30D
LM339
5
4
11
220R 5%
470R 5%
R184
RD
2
13
U28A
LM339
LM339
5
10
11
R175
3K01
7
U19B
5
6
1
2
3
D7
1N4148
(-)
LED16
GN
7
(+)
R163
LED14
RD
U17B
4580
5
6
123
SW7A
523K
R162
287K
D18
4148
523K
R130
15K0
1
14
U30B
LM339
U30C
LM339
6
7
8
9
10
910R 5%
2K00
R211
R210
LED20
LED21RDLED22RDLED23
1
14
U28B
LM339
U28C
LM339
8
9
6
7
4
4K99
R176
4580
R177
4K02
R179
1
U20A
4580
17K4
R166
3
2
R207
475R
ZD1
DZ 2.7V
-15V
3K01
INTERACTIVE
+15V
C121
0.33uF
R167
17K4
R196
24K9
B
RD
R214
22R 1/4W
2
U30A
LM339
5
4
4K22
R212
RD
13
U28D
LM339
11
10K0
R208
7K15
4148
D24
R76
4K70
10N
C112
VR13
THRESHOLD
EXPANDER/GATE
+15V -15V
8K06
R213
RD
LED19
10
R209
33K 5%
10K0
R24
10K0
R23
3
B50K
1
C104
EXPANDER/GATE
+15V-15V
2
R202
-15V
COMP-REDUCTION
7
U20B
5
6
U21A
R122
3N3
1
VR16
B10K
1:N RATIO
3
D22
4148
1
U22A
3
0R 5%
10M0
R198
47P
C122
47K5
R43
7
6
47K5
R42
13
1
1110
3
2
4580
1
2
D23
100K
10K0
R22
D21
2
10K0
R21
R161
523K
R20
R19
5
CA3086
U25A
2
9
U24A
COMP-LEVEL
HR : 2SA1036(PNP)
4580
3
4148
7
U21B
5
6
2
1K50
R205
R118
2K20
4148
R70
20K0
4580
1
U23A
2
2M21
R201
-15V
10K0
U23B
6
10K0
U24B
TL064
U25E
1413
U25D
CA3086
TL064
BR : 2SC2412(NPN)
RELEASE
EXPANDER/GATE
-15V
1M00
R87
R206
680K 5%
-15V
C118
2.2uF
4580
THRESHOLD
EXPANDER/GATE
(-)
(+)
LED17GNLED15
RD
6.8K 1/4W
R204
+15V
3K01
R164
4580
3
R200
4K99
7
C123
1uF
4580
5
4M70
R199
-15v
R197
10M0
CA3086
12
5 3
4
8 7
6
U25C
CA3086
R203
6.8K 1/4W
7
U22B
4580
5
6
-15V
14
U24D
TL064
U25B
CA3086
12
13
8
U24C
TL064
9
10
D
C
B
A
D
6
8
7654321
R124
R108
2K00
7
R107
5K11
C
5K11
B
C39
104P
C37
104P
C35
104P
C33
104P
C31
104P
+15V
5K11
U6B
B10K
U6A
C101
2
R101
4580
5
6
4
3
2
C93
47u/25V
R62
3K60
1
4580
R123
10K0
R102
3
2
5K11
5K11
22N
1
4580
3
R98
5K11
456
SW5B
SW5A
123
EQ_OUT
P
BYPASS
BYPASS
R35
47K5
C90
47u/25V
7
R105
5K11
7
5K11
U8B
R104
R73
4K70
4
VR5B
B20K
6
4580
5
6
VR6
B10K
C107
5
C92
47u/25V
R61
3K60
1
U8A
4580
R16
56N
2
3
2
1
R72
C106
10K0
R100
3
VR5A
B20K
5K11
4K70
56N
R97
R109
R65
R119
2K20
1
U7A
5K11
3
2
R36
47K5
C95
47u/25V
7
U7B
R142
4580
5
6
2K70
R86
1M00
5K11
2K00
C111
R111
1K00
1
4580
U9A
3
2
SW_LED2 SW_LED3
LED8
SW5C
LED7
SW6B
GR
789
GR
456
P
P
BYPASS
ABSENCE
101112
SW5D
R106
1
VR4
5K11
R103
C102
22N
P
BYPASS
5K11
U5A
R99
4
VR3
B10K
1
R15
10K0
R14
3
2
C91
47u/25V
R120
100K
R117
2K20
7
U5B
4580
5
6
R114
100R
C105
6N8
R110
1K00
10K0
C103
3N3
A
VER030217
43of
C.C.LIN
C40
104P
C38
104P
C36
104P
C34
104P
C32
104P
-15V
U9C
4580
4 8
U8C
4580
4 8
U7C
4580
4 8
U6C
4580
4 8
U5C
4580
4 8
123
10N
SW6A
4580
C110
1N8
R121
100K
RevisionModel No:
ALTO : ALTO VOICE FP BOARD (EQ)
Titel
Size
ABSENCE
Drawn By:
Sheet
ALTO VOICE
17-Jul-2003
ALTO VOICE PCBFP-3.Sch
A4
File:
Date:
U9B
R96
C132
D
5K11
47P
4580
5
6
R95
5K11
COMPRESSOR_OUT
C
B
A
1 2 3 4 5 6 78
B
7
R75
1K20
+15V
1
2
J3
CON2
R225
10R
TR4
1
2
1
U35
VCR-VTL5C4
4
3
BR
D15
1N4148
R26
10K0
R77
4K70
D14
1N4148
4580
3
2
R224
1M5
R132
15K0
7
R241
301K
U10B
4580
5
6
C98
1u50V
R57
1K
D12
R218
1N4148
1
D11
4580
R223
3
47K5
R63
3K60
12
1N5
B10K
R219
150R
3
2N7
R217
6.2K 5%
1.3K 5%
4
9
B20K
VR7C
C125
680P
6
7
VR7B
D13
1N4148
7
1N4148
D9
1N4148
U11B
82K0
VR7D
B20K
11
4
7
U12B
6
5
1
B20K
VR7A
B20K
3
R215
5K23
C124
EQ_OUT
4580
5
6
R45
47K5
10
C128
1N5
5
VR8B
B10K
R220
150R
6
4580
R25
10K0
5
R216
6.2K 5%
2
3N3
R195
C
MAIN_OUT
1
U13A
R172
5K11
2
47u/25V
R170
2
SW9A
39K 5%
39K 5%
4580
3
VR9
B50K
R192
123
C96
7
U13B
6
+15V
R171
39K 5%
U10A
1
15K0
LED12
456
SW9B
BYPASS
R41
47K5
+15V
GR
P
BYPASS
47u/25V
D10
4580
5
R221
220R 5%
1
U36
R191
18K 5%
3
R131
15K0
U12A
R189
5K11
2
1N4148
D8
1N4148
U11A
R222
82K0
2
2
R44
VCR-VTL5C4
4
C127
2
1
VR8A
1
4580
3
27K 5%
R194
C97
3
D
-15V
C130
8
7654321
R234
1M00
R233
2M00
104P
LED40
RED
LED39
GR
LED38
GR
LED37
GR
U33D
LED36
GR
LED35
GR
TR5
HR
R235
1K5
+15V
R236
D27
R237
90K2
D26
D25
1N4148
R238
+15V
R226
14K0
5
42U33A
LM339
R227
6K81
1
67U33B
LM339
R228
2K70
C85
8
914U33C
LM339
R229
2K20
13
LM339
10
11
R230
1.1K 5%
8
914U34C
LM339
R231
270R 5%
10
1113U34D
LM339
R232
100R
C129
1u/50V
1K00
1N4148
1
1N4148
6
7
U34B
LM339
1K00
20P
C126
R190
101112
SW9D
P
BYPASS
5K11
4K99
8
R174
-15V
LED11
GR
789
P
SW9C
SW_LED3
BYPASS
A
Titel
C79
104P
C77
104P
C75
104P
C73
104P
+15V
U13C
U12C
U11C
U10C
R240
22R0
U34E
312
U33E
312
VER030217
44of
C.C.LIN
RevisionModel No:
Drawn By:
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ALTO VOICE
17-Jul-2003
ALTO VOICE PCBFP-4.Sch
ALTO : ALTO VOICE FP BOARD (OUTPUT)
A4
Size
File:
Date:
C80
104P
C78
104P
C76
104P
C74
104P
-15V
4580
4 8
4580
4 8
4580
4 8
4580
4 8
LM339
LM339
1 2 3 4 5 6 78
D
C
B
A
220u/25V
8
1000u/35V
104P
A
VER030217
11of
C.C.LIN
RevisionModel No:
Drawn By:
Sheet
ALTO VOICE
17-Jul-2003
ALTO VOICE PCBRP.Sch
ALTO : ALTO VOICE RP BOARD
A4
Titel
Size
File:
Date:
SGND
C38
220u/25V
-15V
U2
7915
C36
1000u/35V
C30
104P
1
2
J4
JUMP
B
SGND
C27
104P
C34
104P
JY-5030-030G
4
C18
470P
C17
470P
R30
60R4
7
U5B
4580
5
R34
2K67
SGND
C26
104P
C33
104P
C25
104P
C32
104P
U5C
4580
4 8
+15V
-15V
U4C
4580
4 8
U3C
4580
4 8
C37
C21
ZD1
1N5261B
(47V)
100/63V
+15V
U1
7815
C35
R37
+48V
TR1
20K
C22
100/63V
TIP122
R36
10K
MAIN_OUT
C
REC_OUT
X7
213
R12
R29
R25
3K16
R22
4K53
60R4
R20
5K76
1
U5A
10P
C13
3
2
R15
10K0
SGND
R11
3K16
C12
EQ_OUT
SGND
10
CON10
10
CON10
SGND
3K24
R26
4K53
R18
6K04
4580
6
C14
10P
R16
10K0
7
20K0
R8
10P
U3B
4580
5
6
SGND
R6
20K0
EQ_OUT
D
8
MAIN_OUT
X3
JY-6351G-02-250
X6
3c5e1a
4d
2b
7654321
R10
R27
R23
3K16
R21
4K53
60R4
R19
5K76
1
U4A
C11
10P
3
2
R14
10K0
SGND
R9
10P
C9
3K24
R24
4580
3K16
1
R7
20K0
3
2
R5
20K0
MAIN_OUT
JY-5030-030G
213
4
C16
470P
C15
470P
4K53
R28
60R4
R17
6K04
7
U4B
4580
5
6
C10
10P
R33
2K67
SGND
R13
10K0
U3A
4580
SGND
+15V-15V
123456789
J2
123456789
J1
+48V
C31
MIC_IN+
MIC_IN-
LINE_IN-
LINE_IN+
INSERT_SEND
INSERT_RET
R35
150R
C20
C19
100/63V
100/63V
BD1
1A
4
X1
MIC_IN+
MIC_IN-
213
MIC_INPUT
D
D2
D1
1N4004
LINE_IN-
LINE_IN+
C2
100P
C1
100P
3c5e1a4d2b
JY5042-030G
X2
C5
100P
C3
100P
JY-6351G-02-250
LINE_INPUT
INSERT_SEND
INSERT_RET
R32
1K00
SGND
C4
100P
C6
100P
3c5e1a4d2b
X4
JY-6351G-02-250
SIDECHAIN
RETURN
C
3c5e1a4d2b
X5
C8
100P
C7
100P
JY-6351G-02-250
SIDECHAIN
SEND
B
1N4004
C23
C28
104P
C29
100/63V
104P
123
J3
TP1
GND
CON3
1 2 3 4 5 6 78
A
PCB:VOICEFP Top Layer
4.PRINTED CIRCUIT BOARD
9
PCB:VOICEFP Top Solder Mask
PCB:VOICEFP Bottom Layer
PCB:VOICEFP Bottom Solder Mask
PCB:VOICEFP Top Overlay
PCB:VOICEFP Bottom Overlay
10
PCB:VOICEFP Drill Drawing Plots
Layer Pair : TopLayer to BottomLayer
ASCII File : NCDrillOutput.TXT
EIA File : NCDrillOutput.DRL
Tool Hole Size Hole Count Plated Tool Travel
---------------------------------------------------------------------------
T1 24mil (0.6096mm) 464 106.58 Inch (2707.12 mm)
T2 31mil (0.7874mm) 244 72.08 Inch (1830.89 mm)
T3 35mil (0.889mm) 28 32.00 Inch (812.80 mm)
T4 39mil (0.9906mm) 83 35.44 Inch (900.28 mm)
T5 87mil (2.2098mm) 32 30.18 Inch (766.64 mm)
T6 126mil (3.2004mm) 6 NPTH 29.25 Inch (742.90 mm)
---------------------------------------------------------------------------
Totals 857 305.54 Inch (7760.63 mm)
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