Alto L-6 Service Manual
MODEL: L-6
www.altoproaudio.com
Version 1.0
CONTENTS
1. Introduction…………………………………………………………….2
2. Specification…………………………………………………………....3
3. Black Diagram………………………………………………………….4
4. Schematic Diagram……………………………………………………5
5. Wiring Diagram………………………………………………………..10
6. PCB Layout…………………………………………………………….11
7. Test Procedure………………………………………………………..16
8. BOM……………………………………………………………………..22
1. Introduction
The L-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: you can find great 3-band equalizers in each chhannel,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 on each mono Channels and each stereo Channels.
- Adjusts the input sensitivity on each stereo 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 6 segment Bar graph Meters.
- Performance and excellent noise figures
- Rugged construction ensures long life even under the most demanding conditions
- Manufactured under ISO9001 certified management system
Mono input channels
m
m
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 60dB (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
Stereo input channels
Line input Unbalanced
Frequency response 10Hz to 55kHz,+3dB
Distortion (THD & N) 0.005% at +4dBu,1kHz
Impedance
Microphone input 1.4kOhm
All other inputs 10kOhm or greater
Tape out 1kOhm
All other output 120Ohm
Equalization
Hi shelving +15dB @ 12kHz
Mid bell +12dB @ 2.5kHz
Low shelving +15dB @ 80Hz
Main Mix Section
Noise (Bus noise) Fader 0dB, channels muted:100dBr (ref.:+4dBu)
Fader 0dB, all input channels assigned and set to
UNITY gain: (ref.: +4dBu)
Max output +22dBu balanced XLR
+22dBu unbalanced , 1/4” jacks
AUX return gain range OFF to 15dB
AUX send max out +22dBu
DSP section
A/D and D/A converters 24 bit
DSP resolution 24bit
Type of Vibraflange, Funky, Rockabilly, bigstage, vibrato 1-
4, Flanger1-4, Chorus 1-4
Presets 16
Presets 16-positon preset bank selector
Controls FX level, reverb level Clip LED
Power supply (AC/AC adapter)
Main Voltage USA/Canada 100 12V~, 60Hz
Europe 210 230V~,50Hz
U.K./Australia 240V~, 50Hz
Power consumption 15Watts
Physical
Net weight 1.4kg (xxxlb)
Shipping weight Xxx kg (xxxlb)
Dimension (W*D*H)
185m
×230mm×35/55m
A
VER030701
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L-6 BLOCK DIAGRAM
ALTO MIXING CONSOLE
8-Sep-2003
L6MAP Sch
A2(C)
Titel
Size
File
Date
3
2
B
PHONES
TRS
PHONES OUTPUT
CONTROL ROOM OUTPUT
LEFT
TRS
CONTROL ROOM
& PHONES
RIGHT
TRS
LEFT METER
RIGHT METER
D
8
MAIN OUT
AUX SEND1
TRS
AUX SEND
7654321
TRS
LEVEL
MAIN MIX
MAIN MIX LEFT
C
LEFT
RIGHT
TAPE OUT
TRS
MAIN MIX RIGHT
2-TRACK
TAPE IN
2
2
2TK TO MIX
1
3
1
3RIGHT BUS
1
3
1
2
2TK TO CTRL ROOM
AUX 1
EFX SEND
AUX-1
RIGHT-BUS
LEFT-BUS
RIGHT BUS
LEFT BUS
PAN
LEVEL
12K2.5K80
+/ 15db
LO MID HI
GAIN
3-BAND EQ
+
-
LEFT BUS
EFX SEND
AUX 1
AUX1
PRE
POST
1 2
1 2
RIGHT BUS
LEFT BUS
BALANCE
LEVEL
SG/OL
12K2.5K80
+/ 15db
-
3-BAND EQ
+
LO MID HI
RIGHT BUS
LEFT BUS
AUX 1
LEFT BUS
RIGHT BUS
AUX 1
EFX SEND
AUX-1
RIGHT-BUS
LEFT-BUS
AUX1
PRE
POST
1 2
1 2
SG/OL
AUX1
AUX RETURN1
12K2.5K80
EQ
-
-
+
-
+
+
DSP BOARD
213
+48V
POWER
PHANTOM
MONO INPUT CHANNELS ( 1-2 )
MIC IN
LINE IN
D
T
RSRN
TNTRSRN
3c5e1a4d2b
MIC GAIN:0~60dB
LINE IN TRIM:+15dB~-45dB
STEREO INPUT CHANNELS (3-6)
C
3c5e1a4d2b
LEFT(MONO)
T
RSRN
TN
RIGHT
TNTRSRN
3c5e1a4d2b
STEREO AUX RETURN 1
B
TN
3c5e1a4d2b
LEFT
RIGHT
PRESETS
FX LEVEL
REVERB LEVEL
1 2 3 4 5 6 78
A
7654321
PH PWR
R7
R9
6K81
330P
22u/35V
C1
22u/35V
R8
6K81
330P
22u/35V
C3
22u/35V
C5
C2
PH PWR
C6
C4
6K81
C7
47u/63V
4K02
R11
4K02
R10
6K81
C10
47u/63V
4K02
R13
4K02
C169
100P
C170
100P
C171
100P
C172
100P
C173
100P
C174
100P
C175
100P
C176
R12
1K50
R14
1K50
100P
C8
47u/63V
R15
C9
47u/63V
R17
R1
4R7
1
X1
JY-5042-030G
X3
JY-6351G-02-250
X2
JY-5042-030G
X4
JY-6351G-02-250
X5
JY-6351G-02-250
X6
JY-6351G-02-250
X7
JY-6351G-02-250
X8
JY-6351G-02-250
3
2
4
R3
4R7
3c
R
4d
RN
2b
TN
1a
T
5e
S
R2
4R7
1
3
2
4
R5
4R7
3c
R
4d
RN
2b
TN
1a
T
5e
S
3c
R
4d
RN
2b
TN
1a
T
5e
S
3c
R
4d
RN
2b
TN
1a
T
5e
S
3c
4d
RN
2b
TN
1a
T
5e
S
3c
R
4d
RN
2b
TN
1a
T
5e
S
MIC 1
D
LINE IN1
MIC GAIN=0~-60dB
LINE IN GAIN=+15~-45dB
MIC 2
LINE IN2
C
LINE IN 3/4
LEFT(MONO)
RIGHT
B
LINE IN 5/6
LEFT(MONO)
A
RIGHT
1 2 3 4 5 6 7 8
R113
10K0
C26
R122
10K0
C31
R121
10K0
C34
C35
R114
10K0
22P
R123
10K0
22P
R130
10K0
22P
R131
10K0
R132
10K0
22P
-VCC
-VCC
C11
10n
20K
C15
1n
C12
10n
R22
20K
C17
1n
2K49
R19
R34
2K49
R45
-VCC
-VCC
VCC
VCC
R35
2K49
TR5
R48
470R
TR1
A1316
R36
2K49
TR6
R50
470R
TR3
A1316
2
3
R115
10K0
6
5
R124
2
3
6
5
HR
R16
1K50
HR
R18
1K50
10K0
R133
10K0
R134
10K0
VCC
VCC
R38
C13
10n
R49
470R
TR2
A1316
C16
1n
C14
10n
R51
470R
TR4
A1316
C18
1n
C27
22P
R116
10K0
U7A
4580M
C33
22P
R125
10K0
U7B
4580M
C32
22P
R136
10K0
U10A
4580M
C36
22P
R135
10K0
U10B
4580M
C19
BAS316
2K49
1000u/10V
TR7
HR
VR12
O10K
R4
4R7
R37
2K49
-VCC
VCC
VCC
R39
C20
BAS316
2K49
1000u/10V
TR10
HR
VR13
O10K
R6
4R7
R46
2K49
-VCC
C61
47u/25V
1
R23
20K
C72
47u/25V
7
R26
20K
C81
47u/25V
1
7
C82
47u/25V
PRE-CH7
R27
20K
PRE-CH8
R28
20K
R40
2K49
D6
R41
2K49
D7
PRE-CH5
PRE-CH6
VCC
-VCC
VCC
-VCC
PRE-CH5
PRE-CH6
R42
2K49
TR8
HR
R43
2K49
R44
2K49
TR9
HR
R47
2K49
3
2
C21
22P
5
6
22P
3
2
C28
22P
5
6
C29
22P
EQ HI
12KHZ
MID
2.5K
LO
80HZ
EQ HI
12KHZ
MID
2.5K
LO
80HZ
U1A
4580M
C22
U4A
4580M
R54
5K11
R59
5K11
R55
5K11
U1B
4580M
R60
5K11
U4B
4580M
C123
18n(M)
R96
910R
R84
6K8
C114
33n(M)
C124
18n(M)
R100
910R
R85
6K8
C113
33n(M)
VR6A
B50K
C128
12n(M)
VR6B
B50K
C130
12n(M)
3
2
5
6
C135
18n(M)
C140
12n(M)
R97
910R
R86
6K8
C115
33n(M)
R126
10K0
C136
18n(M)
C142
12n(M)
R101
910R
R87
6K8
C116
33n(M)
R127
10K0
U2A
4580M
U2B
4580M
C25
22P
R58
5K11
C30
22P
R61
5K11
C62
47u/25V
C73
47u/25V
PRE-CH7
PRE-CH8
47u/25V
1
47u/25V
7
C52
C53
2
3
6
5
EQ HI
EQ HI
MID
2.5K
80HZ
MID
2.5K
80HZ
R20
20K
R24
20K
4580M
4580M
LO
LO
U8A
U8B
C153
22P
C156
22P
R189
1M
C125
18n(M)
R102
910R
R89
6K8
C117
33n(M)
C126
18n(M)
R104
910R
R90
C118
33n(M)
6K8
R187
1M
1
C64
47u/25V
R117
10K0
R128
10K0
7
C74
47u/25V
R110
1K1
R74
1K3
R111
1K1
R75
1K3
VR8A
B50K
VR10A
B50K
VR8B
B50K
VR10B
B50K
VR9A
B50K
C131
12n(M)
VR9B
B50K
C132
12n(M)
C137
18n(M)
C143
12n(M)
R103
910R
R91
6K8
C120
33n(M)
R138
10K0
C144
12n(M)
R105
910R
R92
6K8
C119
33n(M)
R137
10K0
C138
18n(M)
R242
22K
R243
22K
R248
R249
47u/25V
47u/25V
VR15
C121
18n(M)
EQ HI
12KHZ
MID
2.5K
LO
80HZ
EQ HI
12KHZ
MID
2.5K
LO
80HZ
C65
R201
47u/25V
3K9
LEVEL
VR1A
2
W50K
3
C66
R202
47u/25V
3K9
LEVEL
VR1B
6
W50K
5
C147
R88
2.2u/50V
6K8
R179
4K7
47K
U11A
U11B
C157
22P
C160
22P
TR15
BR
R190
1M
1
C76
47u/25V
R139
10K0
R140
10K0
R191
1M
7
C84
47u/25V
47K
C75
2
3
4580M
C83
6
5
4580M
C109
33n(M)
(SOLTON 1K2)用
C111
33n(M)
4580M
U9B
4580M
R94
910R
R77
6K8
C122
18n(M)
R98
910R
R81
6K8
C154
22P
C155
22P
TR16
BR
U9A
PGND
R106
R69
R108
1K1
R72
1K3
R211
36K
1
R210
36K
7
R197
LD3
RED
1K1
1K3
1K50
B50K
VR14
B50K
VR16
B50K
VR19
B50K
47u/25V
R118
10K0
C77
47u/25V
PEAK
VR17
B50K
12n(M)
VR20
B50K
12n(M)
C68
VCC
R250
C127
C129
R244
22K
R245
22K
47K
R251
47K
R119
10K0
C134
18n(M)
C139
12n(M)
R95
910R
R78
6K8
C110
33n(M)
R112
10K0
C133
18n(M)
C141
12n(M)
R99
910R
R82
6K8
C112
33n(M)
R120
10K0
LEVEL
LEVEL
R182
4K7
R176
4K7
BAL
R180
4K7
J3
R227
C78
47u/25V
VR2A
W50K
C79
47u/25V
VR2B
W50K
2.2u/50V
C56
47u/25V
C69
47u/25V
POST
(PRE)
5K1
C148
VR21
B50K
R204
R203
3K9
R170
R171
R224
3K9
6
5
68K
6
5
68K
5K1
R228
5K1
TR17
BR
4580M
2.2u/50V
4580M
2.2u/50V
AUX-POST
VR28
W50K
2
3
6
5
4580M
R93
6K8
U3B
C145
R172
4K7
U6B
C146
R177
4K7
C149
22P
R186
1M
C150
22P
R188
1M
RIGHT-BUS
4580M
U12B
TR18
BR
47u/25V
7
47u/25V
7
LEFT-BUS
AUX-1
C158
22P
U12A
C159
22P
PGND
C57
R79
TR11
BR
C70
R83
TR13
BR
R213
36K
1
R214
36K
7
R198
1K50
6K8
6K8
LD4
RED
R141
10K0
C85
47u/25V
LEVEL
LEVEL
C80
47u/25V
VCC
PEAK
TR12
BR
TR14
BR
C58
47u/25V
VR24
W50K
R193
30K
PGND
C59
47u/25V
VR26
W50K
R194
30K
PGND
R129
10K0
R195
1K50
LD1
RED
R196
1K50
LD2
RED
R199
3K9
PEAK
R200
PEAK
R181
4K7
BAL
R183
4K7
J4
C60
47u/25V
J1
C71
47u/25V
J2
POST
(PRE)
POST
(PRE)
U10C
4580M
U2C
4580M
R173
4K7
PAN
VR18
B50K
R174
4K7
R221
AUX-POST
VR25
W50K
R220
5K1
R175
4K7
PAN
VR22
B50K
R178
4K7
R226
AUX-POST
VR27
W50K
R225
5K1
C180
100n
C192
100n
C185
100n
C186
100n
U11C
4580M
U3C
4580M
84
84
84
84
C151
22P
R209
2
3
VCC
3K9
2
3
VCC
VCC
-VCC
VCC
-VCC
36K
1
U3A
4580M
C152
22P
R212
36K
1
U6A
4580M
C179
100n
84
U9C
4580M
C189
100n
C184
100n
84
U1C
4580M
C183
100n
L6G.S01 L6G.S02 L6G.S03
R229
5K1
LEFT-BUS
VR23
B50K
RIGHT-BUS
R231
5K1
POST
AUX-POST
VR29
W50K
AUX-1
(PRE)
R230
5K1
R223
5K1
5K1
R222
5K1
5K1
C181
100n
C195
100n
C187
100n
C188
100n
LEFT-BUS
RIGHT-BUS
AUX-1
LEFT-BUS
RIGHT-BUS
AUX-1
U12C
4580M
U4C
4580M
84
84
Titel
Size
Date
File
C182
100n
C198
100n
C190
100n
C191
100n
L6G(1/4)
C199
100n
84
U7C
4580M
C200
100n
C196
100n
84
U6C
4580M
C197
100n
INPUT STAGE
PCB# L6MAIN.PCB
ALTO L-6 VER030709A2(C)
8-Sep-2003
L6G.Sch
C23
22P
R56
5K11
1
R62
10K0
7
R63
10K0
C24
22P
R57
5K11
1
R65
10K0
7
R64
10K0
VR5A
B50K
R107
1K1
R70
1K3
VR7A
B50K
VR5B
B50K
R109
1K1
R73
1K3
VR7B
B50K
U8C
4580M
8
D
C
C201
100n
84
C202
100n
B
A
RevisionModel No
Sheet
Drawn By
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KEVIN LIN.
7654321
8
L6G (2/4)
L-METER
C89
47u/25V
R-METER
R238
10K0
7
C102
47u/25V
R239
10K0
1
C101
47u/25V
CONTROL
ROOM
C90
47u/25V
VR4B
W50K
R205
VR4A
W50K
MAIN MIX
LEFT
R274
39K
MAIN MIX
RIGHT
R275
39K
3K9
R206
3K9
2
3
C39
22P
6
5
C94
47u/25V
VR11B
W50K
C103
47u/25V
VR11A
W50K
4580M
U15B
4580M
C40
U15A
R207
3K9
R208
3K9
22P
1
7
47u/25V
2
3
6
5
R215
36K
C91
47u/25V
R142
10K0
R217
36K
C95
C165
22P
U19A
4580M
C168
22P
U19B
4580M
R145
10K0
R218
36K
1
R219
36K
7
C161
22P
R143
10K0
C162
22P
R144
10K0
2
3
2
3
U16A
BA15218N
U17A
BA15218N
6
1
5
6
1
5
47u/25V
C104
47u/25V
BA15218N
BA15218N
C96
U16B
U17B
7
7
R259
120R
R260
120R
R261
120R
R266
120R
R146
10K0
R149
10K0
PHONES
R262
120R
R263
120R
R268
120R
R267
120R
120R
120R
120R
R277
1K
R269
R270
120R
R272
R271
3c
4d
2b
1a
5e
X9
JY-6351G-02-250
CTRL ROOM L
3c
R
4d
RN
2b
TN
1a
T
5e
S
JY-6351G-02-250
CTRL ROOM R
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
3c
R
4d
RN
2b
TN
1a
T
5e
S
JY-6351G-02-250
X17
SCP6873NS3232
14
X11
X12
MAIN L (UNBAL)
X13
MAIN R (UNBAL)
X14
TAPE INTAPE OUT
D
C
B
L(WHITE)
C37
U21A
4580M
R33
R32
U13A
4580M
U13B
4580M
6
5
2
3
22P
C38
22P
C92
47u/25V
1
4580M
1
7
U14B
U14A
4580M
R255
270K
C88
47u/25V
R256
270K
C93
47u/25V
AUX-SEND1
R29
20K
C163
22P
C99
47u/25V
7
R148
10K0
C166
22P
C100
47u/25V
1
R147
10K0
R232
5K11
R233
5K11
R265
120R
R264
120R
AUX-SEND1
LEFT-BUS
RIGHT-BUS
R236
5K1
R237
5K1
RIGHT-BUS
3c
R
4d
RN
2b
TN
1a
T
5e
S
X10
JY-6351G-02-250
2TK TO CR-L
2TK TO MIX
SW4A
PS-22E85L
2TK TO CR-R
SW4B
PS-22E85L
RIGHT-BUS
LEFT-BUS
LEFT-BUS
AUX SEND1
2TK TO
CTRL ROOM
2TK TO CR-L
2TK TO CR-R
LEFT-BUS
RIGHT-BUS
SW3A
PS-22E85L
SW3B
PS-22E85L
6
5
2
3
AUX RETURN 1
C86
AUX-1
2TK-IN-L
2TK-IN-R
47u/25V
C230
100P
C87
47u/25V
C231
100P
D
C
B
AUX-RTN1-L
AUX-RTN1-R
R254
150K
R246
22K
R253
150K
R247
22K
2TK- N-L
2TK- N-R
VR3A
W50K
VR3B
W50K
AUX-1
R216
36K
C98
47u/25V
C177
100P
C97
47u/25V
C178
100P
2
3
6
5
C41
22P
2
3
10K0
R30
20K
10K0
R31
20K
R257
27K
C164
22P
U18B
4580M
C167
22P
U18A
4580M
PHONES/
R258
27K
R278
1K
PH PWR
2TK-IN-L
2TK-IN-R
Titel
SEND & MAIN OUT & 2TK & CTRL R & PHONES
Size
A2(C)
Date:
File:
8-Sep-2003
L6G.S01
CN1
DGND
2.5-8P
1
2
3
4
5
6
7
8
SW1B
PS-22E85L
SW1A
PS-22E85L
+VCC-VCC
+5VD
PGND
C204
100n
+VCC
A
-VCC
84
U13C
4580M
C203
100n
1 2 3 4 5 6 78
84
U14C
4580M
C206
100n
C205
100n
84
U15C
4580M
C207
100n
C208
100n
84
U18C
4580M
C209
100n
C210
100n
84
U19C
4580M
C211
100n
C212
100n
84
U21C
4580M
C215
100n
C216
100n
+VCC
-VCC
R281
47R
R280
47R
84
U16C
BA15218N
84
U17C
BA152 8N
C105
47u/25V
C106
47u/25V
C217
100n
C218
100n
2TK-IN-L
2TK-IN-R
6
ALTO L-6
25
R(RED)
3
A
RevisionModel No:
Sheet
Drawn By:
VER030709
42of
KEVIN LIN.
D
C
B
A
VER030709
43of
RevisionModel No:
KEVIN LIN.
4
L6G (3/4)
+VCC
2K
R286
LD19
-VCC
LEFT METER
RED
LD14
YEL
(-30) (-10) (-4) (0) (+10) (+18)
LD13
GR
LD12
GR
LD11
GR
LD10
GR
LD9
321
U25C
14
U25B
1
U24C
14
U24B
1
U23C
14
U23B
1
LM339
LM339
LM339
LM339
LM339
LM339
GR
PWR ON
8
9
6
7
8
9
6
7
8
9
6
7
PGND
+VCC
PH PWR
R290
R292
R289
R291
R288
R285
R287
22K
5K6
3K9
820R
820R
560R
47R
4K7
R184
PGND
LD6
RED
PHANTOM
-VCC
RIGHT METER
LD25
U25D
10
11
4
5
10
11
4
5
10
11
4
5
LM339
13
U25A
LM339
U24D
LM339
13
U24A
LM339
U23D
LM339
13
U23A
LM339
2
2
2
RED
LD24
YEL
LD23
GR
LD22
GR
LD21
GR
LD20
GR
+VCC
47R
R282
100n
C219
312
312
312
84
C239
47P
D4
C107
47u/25V
RLS4148
U25E
LM339
U24E
LM339
U23E
LM339
U22C
4580M
7
6
C108
PGND
5
47u/25V
D5
RLS4148
U22B
R283
C220
4580M
-VCC
47R
100n
R304
C237
R302
100K
10K0
47u/25V
ALTO L-6
DISPLAY STAGE
A4
Titel
Size
PGNDPGND
PGND
Drawn By:
Sheet
8-Sep-2003
L6G.S02
File:
Date:
TR21
+VCC
HR
R284
120R
R52
470R
D1B
D1A
PGND
DA204K
DA204K
R53
470R
R151
10K0
PGND
R273
120R
R303
10K0
PGND
HR
TR22
D2
RLS4148
C238
47P
R299
2
100K
L-METER
D3
RLS4148
1
U22A
3
4580M
R301
100K
C236
47u/25V
R300
100K
1 2 34
R-METER
D
C
B
A
7654321
8
L6G (4/4)
D
+5VD
AR1
680R*4
EN1
3 4
5 6
7 8
SDB161PVB15FS
1
1
2
2
3
4
4
8
VARIATION
COM
DGND
C251
4.7uF
7
7
C243
1.5nF
U29B
4580M
C245
1.5nF
U30B
4580M
C42
22P
VR30
W50K
C250
4.7uF
STEREO AUX
RETURN1
LEFT 1
3c
4d
2b
1a
5e
EFXRTN-L
AUX-RTN1-L
C240
4.7uF
R305
68R
1
U29A
4580M
R307
10K0
R152
10K0
R157
2
3
10K0
FX LEVEL
X15
JY-6351G-02-250
C
C242
R306
68R
RIGHT 1
3c
4d
2b
1a
5e
EFXRTN-R
AUX-RTN1-R
4.7uF
REVERB LEVEL
VR31
W50K
R153
10K0
R160
10K0
R154
10K0
6
5
R161
10K0
6
5
C246
33P
C247
33P
R155
10K0
R163
10K0
GND
CN2
HEADER 8X2
12
34
56
78
910
1112
1314
1516
+5VD
C229
100n
1 2
D
C
X16
JY-6351G-02-250
C241
AUX-SEND1
B
AUX-SEND1
4.7uF
R156
10K0
+VCC
6
5
U31B
4580M
UDASP IN/OUT SECTION
LD8
MUTE(GLOW)
PEAK(FLICKER)
RED
R185
4K7
1
U32A
LM393
C43
22P
R309
2K2
3
2
C244
1.5nF
7
C222
100n
R279
1K
R158
10K0
R159
10K0
R192
1M
7
2
3
R310
2M2
U32B
LM393
C45
22P
R162
10K0
U31A
4580M
R311
7K5
5
6
R312
220R
DGND
1
D8A
RB400D
+VCC
-VCC
R315
820K
84
U29C
4580M
C249
10uF
C224
100n
C225
100n
JP1
PGND
84
U30C
4580M
C226
100n
C227
100n
84
U31C
4580M
84
U32C
LM393
B
A
Titel
Size
A2(C)
Date:
1 2 3 4 5 6 78
File:
UDASP IN/OUT SECTION
ALTO L-6
8-Sep-2003
L6G.S03
Sheet
Drawn By:
RevisionModel No:
KEVIN LIN.
VER030709
44of
A
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