Alto S-6 Schematic
Service Manual
Model: S-6
6 Channel Mixing Console
www.altoproaudio.com
Version: 1.2
ISSUE:2003.9.21
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
2. 功能特性介紹說明(FEATURE)
The S-6 is 2 mono MIC/LINE channels with MIC PREAMPS plus 2 stereo channels perfect
for keyboards, MIDI equipment or other stereo sound sources and a 2-track input/output
for recording and playback in a mixer small enough to carry in your board luggage: meet
the ALTO S-6. In spite of its size, you can find great 3-band equalizers in each channel
plus switchable low-cut filters in the mono channels, one AUX sends, one stereo returns,
phantom power and accurate peak LED and level meters. Plus of course our ultra low
noise circuitry and exceptional build quality.
- 2 MIC Input Channels with gold plated XLRs and balanced Line Inputs.
- 2 Stereo Input Channels with balanced TRS Jacks.
- Ultra-low noise discrete Mic Preamps with +48 V Phantom Power.
- Extremely high headroom – offering more dynamic range.
- Balanced Inputs for highest signal integrity.
- Warm, natural 3-band EQ on each channels.
- Peak LEDs and switchable low-Cut Filter on each Channels.
- 1 AUX Sends per channel for external effects and monitoring.
- Balanced TRS and XLR outputs, Control Room and Headphone Outputs.
- 2-Track Inputs assignable to Main Mix, Control Room / Headphone Outputs.
- Highly accurate 8 segment Bar graph Meters.
- Inserts on MIC channels.
- performance and excellent noise figures
- Rugged construction ensures long life even under the most demanding conditions
- Manufactured under ISO9001 certified management system
Features:
Function description notes
Channel inputs 6
Mono channels 2
Stereo channels 2
MIC PREAMPS 2
EQ (mono channels) 3-band
EQ (stereo channels) 3-band
Aux sends 1
Stereo aux returns 1
2-track input/output 1
Phantom power +48 V
2.1
D
3. S-6方塊圖
3.1
8
AUX SEND
AUX SEND
TRS
MAIN OUT
TRS
MAI N MIX L EFT
213
C
LEFT
MAI N MIX R IGHT
213
TRS
TAPE OUT
2-TRACK
TAPE IN
7654321
2
2
LEVEL
MAIN MIX
2TK TO MIX
1
3
1
3
1
2TK TO CTRL ROOM
B
RIGHT
PHONES
TRS
LEFT
TRS
PHONES OUTPUT
CONTROL ROOM OUTPUT
3
1
3
2
2
& PHONES
CONTROL ROOM
A
RIGHT
TRS
LEFT METER
ALTO MIXING CONSOLE
Titel
RIGHT METER
RevisionModel No:
Size
VER020820
S-6 BLOCK DIAGRAM
A3
11of
Sheet
4-Oct-2002
Date:
KEVIN LIN.
Drawn By:
S6-MAP.Sch
File:
RIGHT- BUS
AUX
AUX
RIGHT-BUS
LEFT-BUS
RIGHT- BUS
LEFT-BUS
PAN
LEVEL
12K2.5K80
LO MID HI
GAIN
+
3-BAND EQ
-
AUX1
+/-15db
LEFT-BUS
AUX-1
SG/OL
LO MID HI
RIGHT- BUS
LEFT-BUS
BALANCE
LEVEL
12K2.5K80
+/-15db
3-BAND EQ
LEFT-BUS
RIGHT- BUS
12K2.5K80
EQ
AUX
AUX
SG/OL
LEFT-BUS
AUX RETURN
-
+
RIGHT- BUS
-
+
MONO INPUT CHANNELS ( 1-2 )
-
213
+48V
POWER
PHANTOM
MIC IN
LINE IN
D
T
RSRN
TN
3c5e1a4d2b
STEREO INPUT CHANNELS (3-6)
C
-
+
+
T
RSRN
TN
3c5e1a4d2b
LEFT(MONO)
RIGHT
B
RSRN
3c5e1a4d2b
STEREO AUX RETURN
T
TN
T
RSRN
TN
3c5e1a4d2b
LEFT(MONO)
RIGHT
A
1 2 3 4 5 6 78
7654321
4.1
8
PH PWR
D
1
MIC 1
JY-5042-030G
LINE IN1
JY-6351G-02-250
C
MIC 2
JY-5042-030G
LINE IN2
JY-6351G-02-250
B
3
2
4
X1
3c
R
4d
RN
2b
TN
1a
T
5e
S
X2
1
3
2
4
X3
3c
R
4d
RN
2b
TN
1a
T
5e
S
X4
R7
6K81
R1
4R7
R2
4R7
C1
22u/35V
R9
6K81
R4
4R7
R5
4R7
C4
22u/35V
22u/35V
22u/35V
C5
330P
C2
PH PWR
C6
330P
C3
R8
6K81
C7
47u/63V
6K34
R11
6K34
R10
6K81
C9
47u/63V
6K34
R14
6K34
R12
R159
1K50
R13
R161
1K50
C8
47u/63V
C10
47u/63V
-VCC
-VCC
C11
10n
R15
20K
C147
1n
R34
2K49
C13
10n
R17
20K
C149
1n
R41
2K49
+VCC
-VCC
+VCC
-VCC
R30
2K49
TR5
HR
R44
470R
TR1
A1316
R160
1K50
R35
2K49
TR8
HR
R46
470R
TR3
A1316
R162
1K50
C12
10n
R45
470R
TR2
A1316
C14
10n
R47
470R
TR4
A1316
C148
1n
C150
1n
+VCC
-VCC
+VCC
-VCC
R31
2K49
TR6
HR
R36
2K49
R37
2K49
TR9
HR
R42
2K49
+VCC
C15
1000u/10V
VR1
010K
R3
4R7
+VCC
C16
1000u/10V
VR2
O10K
R6
4R7
2K49
BAS316
L1
0R0
2K49
BAS316
L2
0R0
R32
D3
R38
D4
+VCC
-VCC
+VCC
-VCC
R33
2K49
TR7
HR
R39
2K49
R40
2K49
TR10
HR
R43
2K49
C18
22P
U1A
4580M
3
2
C17
22P
5
6
C21
22P
R53
5K11
U3A
4580M
3
2
C20
22P
5
6
C24
22P
R57
5K11
R50
5K11
U1B
4580M
R54
5K11
U3B
4580M
R51
5K11
1
R58
10K0
7
R59
10K0
C22
22P
R55
5K11
1
R60
10K0
7
R61
10K0
U2B
4580M
5
6
U2A
4580M
3
2
C19
22P
R52
5K11
C23
22P
R56
5K11
47u/25V
7
47u/25V
1
C44
C49
R16
R18
20K
20K
TP2
TP4
EQ HI
12KHZ
MID
2.5K
80HZ
EQ HI
12KHZ
MID
2.5K
80HZ
LO
LO
C99
18n(M)
R88
910R
R73
6K8
C151
33n(M)
C100
18n(M)
(SOLTON 1K2)用
R90
910R
R75
6K8
C153
33n(M)
R100
1K1
R63
1K3
R101
1K1
R64
1K3
VR3
B50K
VR5
B50K
VR9
B50K
VR11
B50K
VR4
B50K
C105
12n(M)
VR10
B50K
C106
12n(M)
C111
18n(M)
C117
12n(M)
R89
910R
R74
6K8
C152
33n(M)
R165
10K
C112
18n(M)
C118
12n(M)
R91
910R
R76
6K8
C154
33n(M)
R166
10K
C45
47u/25V
C51
47u/25V
6
5
R206
47K
6
5
R207
47K
C127
22P
R106
1M
U5B
4580M
C123
2.2u/50V
R212
4K7
C129
22P
R107
1M
U6B
4580M
C124
2.2u/50V
R213
4K7
C46
47u/25V
7
R71
6K8
TR11
BR
C52
47u/25V
7
R77
6K8
TR13
BR
LEVEL
LEVEL
TR12
BR
TR14
BR
C47
47u/25V
VR8
W50K
R112
22K
PGND
C53
47u/25V
VR14
W50K
R113
22K
PGND
R120
1K5
LD1
RED
R121
1K5
LD2
RED
R124
3K9
+VCC
PEAK
R125
3K9
+VCC
PEAK
C48
J1
C54
47u/25V
J2
POST
(PRE)
POST
(PRE)
VR7A
JQ10K
VR7B
JQ10K
R143
5K1
VR13A
JQ10K
VR13B
JQ10K
R146
5K1
PAN
PAN
R142
5K1
R141
5K1
AUX-POST
VR6
W50K
R145
5K1
R144
5K1
AUX-POST
VR12
W50K
LEFT-BUS
RIGHT-BUS
AUX-1
LEFT-BUS
RIGHT-BUS
AUX-1
C128
22P
R130
U5A
4580M
C130
22P
U6A
4580M
36K
1
R131
36K
1
47u/25V
2
3
2
3
D
C
B
C181
TR21
7815A
TR22
7915A
D8
RLS4148
D9
RLS4148
CN1
AC IN
PGND
SW1
C50
47uF/100V
D6
1N4002
D7
1N4002
C180
1000uF/35V
1000uF/35V
PHANTOM PWR
D10
1N4002
D11
1N4002
A
1 2 3 4 5 6 78
C55
47uF/100V
R20
390K
C177
100uF/100V
R62
10K
C179
47uF/100V
TR23
TIP122
TP3
+16V
1000u/25V
1000u/25V
TP1
-16V
R65
10R
C178
47uF/100V
ZD1
1N5261
(47V 0.5W)
C175
C176
+VCC
PGND
-VCC
R163
0R0
TP5
+48V
PGND
R19
20K
SW2B
4
5
6
P
PS-22E85L
SW2A
1
2
3
PS-22E85L
PH PWR
(U1) (U2) (U3) (U5) (U6)
C165
C167
C169
100n
C168
100n
100n
C170
100n
C171
100n
C172
100n
100n
C166
100n
C173
100n
C174
100n
+VCC
-VCC
84
U1C
4580M
84
U2C
4580M
84
U3C
4580M
84
U5C
4580M
84
U6C
4580M
NOTE :
1. [HR]:2SA1036K
2. [BR]:2SC2412K
S6-IN2-3EQ
S6-IN2-3EQ.S CH
Titel
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Date:
File:
INPUT STAGE ( CH1-CH4 )
ALTO S-6
19-Sep-2003
S6-IN1-3EQ.Sch
S6-PU1
S6-PU1.SCH
Sheet
Drawn By:
RevisionModel No:
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A
VER020915
31of
7654321
4.2
8
VR15A
C101
18n(M)
EQ HI
12KHZ
MID
2.5K
LO
80HZ
EQ HI
12KHZ
MID
2.5K
LO
80HZ
2
3
6
5
C31
R181
10K
R189
10K
22P
C32
22P
R182
10K
U7A
4580M
R190
10K
U7B
4580M
1
7
C79
47u/25V
C86
47u/25V
TP15
TP17
R26
20K
R27
TP16
TP18
20K
R178
C217
100P
C219
100P
C218
100P
C220
100P
10K
R180
10K
C30
22P
R179
10K
R188
10K
C33
22P
3c
R
4d
D
LINE IN 5/6
LEFT(MONO)
X7
JY-6351G-02-250
RIGHT
X8
JY-6351G-02-250
C
RN
2b
TN
1a
T
5e
S
3c
R
4d
RN
2b
TN
1a
T
5e
S
R92
910R
R78
6K8
C155
33n(M)
C103
18n(M)
R94
910R
R80
6K8
C157
33n(M)
R102
1K1
R66
1K3
R103
1K1
R67
1K3
VR17A
VR15B
VR17B
B50K
B50K
B50K
B50K
VR16A
B50K
C107
12n(M)
VR16B
B50K
C108
12n(M)
C113
18n(M)
C119
12n(M)
R93
910R
R79
6K8
C156
33n(M)
C115
18n(M)
C120
12n(M)
R95
910R
R81
6K8
C158
33n(M)
R191
10K
R183
10K
C80
47u/25V
C87
47u/25V
C82
C139
22P
R108
U9A
4580M
1M
1
C81
47u/25V
R184
10K
R185
10K
2
3
R116
22K
R117
22K
LEVEL
LEVEL
47u/25V
VR20A
W50K
C83
47u/25V
VR20B
W50K
R127
3K9
R126
3K9
C140
22P
R138
36K
2
3
U11A
4580M
C141
22P
6
5
U11B
4580M
1
R137
36K
7
47u/25V
C84
C85
47u/25V
R186
10K
R187
10K
BAL
VR19A
JQ10K
VR19B
JQ10K
R154
5K1
R153
5K1
LEFT-BUS
D
RIGHT-BUS
J3
C142
22P
R109
U9B
4580M
1M
7
C88
47u/25V
R208
47K
R209
47K
R215
4K7
C125
2.2u/50V
R82
6K8
TR15
BR
TR16
BR
PGND
R122
1K50
LD3
RED
+VCC
PEAK
6
5
POST
(PRE)
R155
5K1
AUX-POST
VR18
W50K
AUX-1
C
VR21A
C102
18n(M)
EQ HI
TP21
TP22
12KHZ
MID
2.5K
LO
80HZ
EQ HI
12KHZ
MID
2.5K
LO
80HZ
U7C
4580M
2
3
6
5
R196
10K
R197
84
C36
22P
C37
22P
10K
4580M
U8C
R199
10K
U8A
4580M
R198
10K
U8B
4580M
84
1
7
47u/25V
47u/25V
U9C
4580M
C90
C91
84
TP19
TP20
4580M
U10C
R28
20K
R29
20K
84
U11C
84
U12C
4580M
84
4580M
R192
C221
100P
C222
100P
C223
100P
C224
100P
(U12)
C42
100n
C43
100n
10K
R193
C34
22P
R194
R195
C35
22P
10K
10K
10K
+VCC
-VCC
3c
R
4d
RN
2b
LINE IN 7/8
LEFT(MONO)
X9
JY-6351G-02-250
B
RIGHT
X10
JY-6351G-02-250
(U7) (U8) (U9) (U10) ( U11)
C205
100n
A
C206
100n
1a
5e
3c
4d
2b
1a
5e
C207
100n
C208
100n
TN
T
S
R
RN
TN
T
S
C209
C38
100n
C39
100n
C40
100n
C41
100n
100n
C210
100n
R96
910R
R83
6K8
C159
33n(M)
C104
18n(M)
R98
910R
R86
6K8
C161
33n(M)
R105
1K1
R68
1K3
R104
1K1
R69
1K3
VR23A
VR21B
VR23B
B50K
B50K
B50K
B50K
VR22A
B50K
C109
12n(M)
VR22B
B50K
C110
12n(M)
C114
18n(M)
C121
12n(M)
R97
910R
R84
6K8
C160
33n(M)
C116
18n(M)
C122
12n(M)
R99
910R
R87
6K8
C162
33n(M)
R205
10K
R200
10K
C92
47u/25V
C93
47u/25V
C89
C143
22P
R111
U10A
4580M
1M
1
C95
47u/25V
R201
10K
R202
10K
2
3
R118
22K
R119
22K
LEVEL
LEVEL
47u/25V
VR26A
W50K
C96
47u/25V
VR26B
W50K
R128
3K9
R129
3K9
C144
22P
R140
36K
U12A
1
R139
36K
7
C98
47u/25V
R203
10K
C97
47u/25V
R204
10K
BAL
VR25A
JQ10K
VR25B
JQ10K
R157
5K1
R158
5K1
LEFT-BUS
B
RIGHT-BUS
2
3
4580M
C146
22P
6
5
U12B
4580M
J4
C145
22P
R110
1M
6
5
U10B
4580M
7
C94
47u/25V
R210
47K
R211
47K
R216
4K7
C126
2.2u/50V
R85
6K8
TR17
BR
TR18
BR
PGND
R123
1K50
LD4
RED
+VCC
PEAK
POST
(PRE)
R156
5K1
AUX-POST
VR24
W50K
AUX-1
A
Titel
Size
A2
Date:
1 2 3 4 5 6 78
File:
INPUT STAGE ( CH3-CH6)
ALTO S-6
19-Sep-2003
S6-IN2-3EQ.Sch
Sheet
Drawn By:
RevisionModel No:
KEVIN LIN.
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32of
D
4.3
C
STEREO AUX
RETURN1
LEFT 1
(MONO / MASTER)
JY-6351G-02-250
RIGHT 1
JY-6351G-02-250
X11
X12
AUX-1
7654321
R236
U20A
LEFT
RIGHT
C59
47u/25V
3K60
VR28B
W50K
U16B
4580M
C60
R237
47u/25V
3K60
VR28A
W50K
4580M
31
1
D1B
R248
C213
10K
47u/25V
PGND
PGND
31
7
D2B
C214
R247
47u/25V
10K
PGND
PGND
C25
22P
R132
36K
AUX-1
3c
4d
2b
1a
5e
3c
4d
2b
1a
5e
2
3
4580M
TP23
47u/25V
TP24
PWR ON
47u/25V
+VCC
R238
2K
LD17
GR
PGND PGND
U13A
C63
C211
100P
C64
C212
100P
PHANTOM
TP6
C56
47u/25V
1
R21
20K
AUX RETURN 1
VR29A
R170
W50K
10K
R114
22K
R169
VR29B
10K
W50K
R115
22K
PH PWR
R214
4K7
LD18
RED
2
3
6
5
4580M
84
U20C
U14A
4580M
U14B
4580M
C26
22P
C27
1
22P
7
U21E
LM339
312
R218
120R
R217
120R
R232
56K
C65
47u/25V
R233
56K
C66
47u/25V
R
RN
TN
T
S
JY-6351G-02-250
R149
5K1
R150
5K1
312
U22E
LM339
3c
4d
2b
1a
5e
X13
312
U23E
LM339
AUX SEND
LEFT-BUS
RIGHT-BUS
C187
100n
C188
100n
R239
47R
PGND
R240
47R
LEFT-BUS
RIGHT-BUS
+VCC
-VCC
C67
47u/25V
C72
47u/25V
LEFT-BUS
RIGHT-BUS
6
5
2
3
L-METER
R-METER
U15B
4580M
U15A
4580M
C131
22P
C132
22P
R244
100K
R243
100K
R147
5K1
7
47u/25V
R148
5K1
1
C57
47u/25V
C58
2
3
6
5
MAIN MIX
R234
30K
MAIN MIX
R235
30K
D1A
DA204K
DA204K
4580M
R245
100K
D2A
DA204K
DA204K
U20B
4580M
R246
100K
6
5
2
3
U16A
+VCC
C134
C133
22P
D5A
22P
7
C61
47u/25V
1
C62
47u/25V
R249
120R
DA204K
DA204K
R223
120R
R134
36K0
R133
36K0
D5B
PGND
R168
10K
R167
10K
R171
10K
TP9
TR20
HR
TR19
HR
TP10
MOUT-L
MOUT-R
R49
470R
PGND
R48
470R
(-30) (-10) (-4) (0)
LD5GRLD6GRLD7GRLD8
1
U21B
LM339
6
7
R251
R250
560R
56R
4
5
U21A
LM339
2
LD11GRLD12GRLD13GRLD14GRLD15
1
14
9
11
U21C
LM339
8
LM339
13
10
U21D
R252
820R
U22B
LM339
6
7
R253
820R
4
5
U22A
LM339
2
R219
120R
9
R221
120R
R222
120R
R220
120R
14
11
U22C
LM339
8
13
10
LM339
GR
R254
3K9
U22D
3c
R
4d
RN
2b
TN
1a
T
5e
S
JY-6351G-02-250
3c
R
4d
RN
2b
TN
1a
T
5e
S
JY-6351G-02-250
(+10) (+18)
LD9
YEL
1
U23B
LM339
6
7
R255
5K6
4
5
U23A
LM339
2
YEL
X14
X15
LEFT METER
LD10
RED
14
U23C
LM339
8
9
R256
22K
10
11
U23D
LM339
13
LD16
RED
MAIN OUT
LEFT
RIGHT
CLIP
-VCC
+VCC
-VCC
8
D
C
C137
22P
R175
10K
C138
22P
R176
10K
2
3
2
3
TAPE IN
TAPE OUT
X17
B
A
SCP6873NS3232
L(WHITE)
R(RED)
1 4
R257
3
2 5
6
1K
R258
1K
C68
47u/25V
C215
100P
TP11
+VCC
-VCC
C69
47u/25V
C216
100P
84
U13C
4580M
U14C
4580M
TP12
(U15) ( U16) (U14) ( U24)
C193
C195
100n
100n
C194
C196
100n
100n
1 2 3 4 5 6 78
C199
100n
C200
100n
C201
100n
C202
100n
C135
22P
R24
20K
6
R22
5
20K
C136
22P
R23
20K
2
R25
3
20K
4580M
84
84
U15C
4580M
U24B
4580M
U24A
84
U16C
4580M
C70
47u/25V
7
R172
10K
C71
47u/25V
1
R177
10K
84
U17C
4580M
R151
5K1
R152
5K1
84
U24C
4580M
LEFT-BUS
2TK TO MIX
3
2
1
SW3A
PS-22E85L
RIGHT-BUS
P
6
5
4
SW3B
PS-22E85L
R242
47R
U18C
BA15218N
R241
47R
2TK TO
CTRL ROOM
1
2
3
SW4A
PS-22E85L
4
5
6
P
SW4B
PS-22E85L
C76
C203
47u/25V
C77
47u/25V
100n
C204
100n
84
84
U19C
BA15218N
PHONES/
R259
27K
47u/25V
R260
27K
L-METER
C73
R-METER
CONTROL
ROOM
C74
47u/25V
VR27B
W50K
VR27A
W50K
R261
7K5
R262
7K5
2
3
6
5
C28
22P
U17B
4580M
4580M
C29
22P
U17A
47u/25V
1
R135
7
C78
47u/25V
R136
36K
C75
R173
10K
36K
TP13
TP14
R174
10K
U18A
BA15218N
U19A
BA15218N
6
1
5
6
1
5
U18B
BA15218N
U19B
BA15218N
7
7
R224
120R
R225
R226
120R
R227
120R
120R
R229
120R
R228
120R
R230
120R
R231
120R
3c
4d
2b
1a
5e
X16
JY-6351G-02-250
3c
4d
2b
1a
5e
X18
JY-6351G-02-250
3c
4d
2b
1a
5e
X19
JY-6351G-02-250
Titel
STEREO AUX & SENDS & MAIN OUT & 2TK & CTRL R & PHONES
Size
A2
Date:
File:
PHONES
LEFT
CTRL ROOM OUT
RIGHT
ALTO S-6
19-Sep-2003
S6-PU1.Sch
Sheet
Drawn By:
RevisionModel No:
KEVIN LIN.
VER020915
33of
B
A
6. PCB LAYOUT
PCB#S6MAIN4 TOP LAYER
6.1
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