Alto L-20, L-16, L-12 Service Manual
Service
MODEL: L-12/16/20
www.altoproaudio.com
Version 2.0
CONTENTS
1. Introduction…………………………………………………………….2
2. Specification…………………………………………………………...3
3. Black Diagram…………………………………………………………5
4. Schematic Diagram…………………………………………………...6
5. PCB Layout……………………………………………………………25
6. Wiring Diagram……………………………………………………….41
7. Test Procedure…………………………………………………….....42
8. Exploded Views & Mechanical Part List………………………….46
9. BOM……………………………………………………………………..49
ALTO L12,L16,L20 FEATURES
CHANNEL STRIPS.
z AUX send 1/2 switch-able to PRE/POST fader
z 60 mm high precision faders
z Each input channel with Mute, SOLO function, low cut filters-75Hz, 18 dB/OCT and Overload
& signal present LEDs.
z Group “SUB” 1-2”, “SUB3-4”, or “main L-R” mix send switch-able
z 4 AUX sends with master control and SOLO function per channel: 2 × PRE/POST fader
switch-able for monitoring/digital EFX application, 2 × post fader(for internal digital EFX or
as external send)
z 4-band fixed EQ on stereo line channels
z 3-band EQ with Swept mid on microphone channels
z Channel inserts and direct output on each mono channel plus main mix inserts for flexible
connection of outboard equipment.
MASTER SECTION
z 24-bit DSP effect built in
z True stereo 9-band graphic EQ
z Adjustable mono main output by control level
z BNC socket for connecting gooseneck lamps.
z Separate outputs for 4 submaster control to enable more flexible routing
z Separate subwoofer crossover and output
z Special XLR Subwoofer out with 75Hz low pass
z Control room/phone matrix
z 2 headphone outputs
8. TECHNICAL SPECIFICATION
Mono input channels
Microphone input
Frequency response
Distortion (THD & N)
Gain range 0dB to 60dB (MIC)
SNR (Signal to Noise Ratio)
Line input
Frequency response
Distortion (THD & N)
Sensitivity range
Stereo input channels
Line input
Frequency response
Distortion (THD & N)
Impedances
Microphone input
Channel Insert return
All other inputs
Tape out
All other output
Equalization
Hi shelving
Mid bell (mono)
Hi Mid (stereo)
Mid low (stereo)
Low shelving
Low Cut filter
DSP Section
A/D and D/A converters
DSP resolution
Type of effects
Presets
Controls
Main Mix Section
Noise (Bus noise) Fader 0 dB, channels muted: 100dBr (ref.:+4dBu)
Max output
AUX Returns gain range
AUX Sends max out
electronically balanced, discrete input configuration
10Hz to 55kHz, + 3dB
0.005% at 4dBu, 1kHz+
115dB
electronically balanced
10Hz to 55kHz, 3dB
0.005% at 4dBu, 1kHz+
15dBu to 45dBu
+
Balanced/unbalanced
10Hz to 55kHz, 3dB
0.005% at +4dBu, 1kHz
1.4kOhm
2.5kOhm
10kOhm or greater
1kOhm
120Ohm
15dB @12kHz
+
+
15dB @100Hz to 8kHz
+
15dB @ 3kHz
15dB @500Hz
+
15dB @80Hz
+
75Hz, 18dB/oct.
24 bit
24 bit
Hall, Room, Vocal & Plate REVERBS
Mono & Stereo DELAY (max DELAY TIME 650ms)
Chorus, Flanger & Reverb MODULATIONS
REVERB+DELAY, REVERB+CHORUS,
REVERB+FLANGER combinations
256
16-position PRESET Selector
16-position VARIATION selector
PEAK LED
MUTE SWITCH with LED indicator
Fader 0dB, all input channels assigned and set to
UNITY gain: 90dBr (ref.:+4dBu)
+22dBu balanced XLR,
22dBu unbalanced, 1/4" jacks+
- to +15dB
+22dBu
+
+
29
Power supply
Main voltage
Power Consumption
Fuse
Main connection
USA/Canada 100 120V~, 60Hz
Europe 210 240V~, 50Hz
U.K./Australia 240V~, 50Hz
70 watts
100 120V~ : T800mAL
210 240V~ : T500mAL
Standard IEC receptacle
30
111098765321
12
MID
(FREQ)
LO
3-BAND EQ
+/-15db
LO M-H HIL-M
4-BAND EQ
+/-15db
4-BAND EQ
+/-15db
LEVEL
DFX TO
MONITOR
LEVEL
LEVEL
LEVEL
DSP BOARD
HI
ASSIGN
FADER
MUTE
12K100Hz-8kHz80
PAN
LEFT-BUS
RIGHT-BUS
SUB1
SUB2
SUB3
SOLO LED
SOLO
()
POST
PRE
AUX4
ON
AUX1
AUX2
AUX3
SUB4
AFL-L
AFL-R
SOLO(PFL)
AUX1
AUX2
AUX3
AUX4
SUB1
SUB2
LEFT-BUS
RIGHT-BUS
AUX1
AUX2
AFL-L
AFL-R
SOLO(PFL)
EFX SEND
SUB3
SUB
LOGIC
AUX3
AUX
CTRL L
CTRL R
AUX1
AFL-L
AFL-R
SOLO(PFL)
SOLO
()
ON
AUX4
AFL-L
AFL-R
SOLO(PFL)
DFX SEND
SOLO
()
ON
LEFT-BUS
RIGHT-BUS
AFL-L
AFL-R
SOLO
()
ON
ASSIGN
SOLO(PFL)
LEFT-BUS
RIGHT-BUS
GEQ
GEQ
SOLO LED
FADER
MUTE
12K50080
3K
BALANCE
SUB1
12K50080 3K
SUB2
SUB3
LEFT-BUS
RIGHT-BUS
SUB1
LEFT-BUS
RIGHT-BUS
CONTROL ROOM SOURCE
CTRL-R-L
CTRL-R-R
AFL-L
2TK TO MAIN
SUB1 TO MIX
2TK
MA N MIX
SOLO CTRL
AFL L
DFX TO
MONITOR
POST
PRE
ASSIGN TO
C-R/PHONES
AUX4
AUX3
AUX2
SOLO LED
AUX1
AUX RETURN
SOLO
SOLO
()
SUB4
AUX1
AUX2
AUX3
AUX4
LEFT-BUS
RIGHT-BUS
AUX1
AUX2
LEFT-BUS
RIGHT-BUS
AFL-L
AFL-R
SOLO(PFL)
ON
LEFT-BUS
CTRL-R-L
RIGHT-BUS
CTRL-R-R
LEFT-BUS
RIGHT-BUS
SUB1
AFL-R
AFL R
SUB2
DFX RETURN TO
AUX1
AUX2
AUX RTN4
ASSIGN TO
SUB3
SUB4
SOLO(PFL)
SOLO(PFL)
(LEVEL SET)
DFX SEND
LEFT-BUS
RIGHT-BUS
AUX1
AUX2
AFL-L
AFL-R
SOLO(PFL)
SUB1
SUB2
SUB3
SUB
DFX SEND
AUX3
AUX
CTRL/L
CTRL/R
LOG C
PHANTOM
POWER
+48V
CH1
MIC IN
CH1
D
LINE IN
MIC GAIN:0~60dB
LINE IN TRIM:+15dB~-45dB
INSERT
2
3
1
3c
R
d
RN
2b
TN
1a
T
5e
S
CH2-CH12 IDENTICAL TO CH1
3c
R
DIRECT OUT
d
RN
(CH1-CH12 ONLY)
2b
PHANTOM
POWER
+48V
CH13/14 &
CH15/16 ONLY
TN
1a
T
5e
S
2
3
1
HI PASS
3c
R
d
RN
2b
TN
1a
T
5e
S
3c
R
d
RN
2b
TN
1a
T
5e
S
LINE OUT
MIC IN
C
LEFT(MONO)
RIGHT
STEREO INPUT CHANNELS (CH13-20)
STEREO AUX RTN1
LEFT(MONO)
RIGHT
STEREO AUX RTN2
B
LEFT(MONO)
RIGHT
STEREO AUX RTN3
LEFT(MONO)
RIGHT
STEREO AUX RTN4
LEFT(MONO)
RIGHT
A
DFX OUT
1 2 3 5 6 7 8 9 10 11 12
3c
R
d
RN
2b
TN
1a
T
5e
S
3c
R
d
RN
2b
TN
1a
T
5e
S
3c
R
d
RN
2b
TN
a
T
5e
S
3c
R
d
RN
2b
TN
a
T
5e
S
3c
R
d
RN
2b
TN
1a
T
5e
S
3c
R
d
RN
2b
TN
1a
T
5e
S
3c
R
d
RN
2b
TN
1a
T
5e
S
3c
R
d
RN
2b
TN
1a
T
5e
S
R
T
S
(TRIM)
+
-
75Hz
HI PASS
SG/OL
-20dB=SG(FLICKER)
+15dB=OL(GLOW)
+
-
75Hz
+
+
CH'S 17/18 & 19/20 ONLY
+
+
+
+
+
+
+
+
FX OUT L
FX OUT R
PRESETS
VARIAT ONS
MUTE
DSP FOOTSWITCH
GAIN
GAIN
(TRIM)
STEREO TRIM
-20dB=SG(FLICKER)
+15dB=OL(GLOW)
SG/OL
(AUX SEND 2/3 IDENTICAL)
EQ ON
SUB1/2
FROM SUB2
SUB3/
FROM SUB3
FROM SUB
PFL LED
AUX SEND1
LEVEL
AUX SEND 4
LEVEL
MAIN MIX
LEVEL
2TK
SUB1
LEVEL
SUBMIX 2 3 4 IDENTICAL TO SUB1
SOLO MODE
()
()
IDENTICAL TO SUB1 INSERTSUB INSERT 2 3 4
AFL
PFL
TAPE IN
LEFT
RIGHT
PHONES
LEVEL
CTRL ROOM
LEVEL
MONO LEVEL
+4dB/MIC
+4dB/MIC
2TK TO MAIN
R
RN
TN
T
S
R
RN
TN
T
S
R
RN
TN
T
S
R
RN
TN
T
S
R
RN
TN
T
S
RN
TN
SOLO ACTIVE
LEFT METER
RIGHT METER
CTRL ROOM OUTPUT
AUX SEND
3c
d
2b
AUX SEND 1/2/3
1a
5e
AUX/DFX SEND
3c
d
2b
1a
AUX SEND 4
5e
MONO OUTPUT
3c
d
2b
1a
5e
MAIN OUT
R
T
S
2
3
1
MAIN MIX LEFT
R
T
S
2
3
MAIN MIX RIGHT
MAIN INSERT
3c
d
2b
1a
5e
MAIN INSERT
3c
d
2b
1a
5e
2TK
TAPE OUT
LEFT
RIGHT
SUB OUT
R
T
SUB1
S
3c
d
2b
SUB1 INSERT
1a
T
5e
S
PHONES OUTPUT
R
T
PHONE A
S
R
T
PHONE B
S
R
T
LEFT
S
R
T
RIGHT
S
ALTO L-20
BLOCK DIAGRAM
(PRELIMINARY)
T tel
ALTO MIX NG CONSOLE
Size
L-20 BLOCK DIAGRAM
A1
1-Oct-2003
Da e:
L20MAP.Sch
Fle:
Sheet
Drawn By:
Revis onModel No:
VER030125
11 of
KEVIN LIN.
D
C
B
A
7654321
8
D
C
B
A
CTRL-R-L
CTRL-R-R
MAIN-L
MAIN-INS-L
MAIN-R
MAIN-INS-R
MONO-LEVEL
R8
CTRL-R-L
CTRL-R-R
120R
R6
120R
R5
120R
R7
120R
3c
4d
2b
1a
5e
X4
JY-6351G-02-250
3c
4d
2b
1a
5e
X3
LEFT
CTRL ROOM OUT
RIGHT
AUXSEND1
AUXSEND2
AUXSEND1
AUXSEND2
JY-6351G-02-250
RTN1
NS1
R9
120R
RTN2
NS2
R10
120R
C2
47u/25V
+VCC
-VCC
FOOTSW
R55
30K
FOOTSWITCH
1 2 3 4 5 6 78
R
RN
TN
T
S
R
RN
TN
T
S
84
U1C
4580M
3c
4d
2b
1a
5e
3c
4d
2b
1a
5e
MAIN-INS-L
X5
JY-6351G-02-250
MAIN-INS-R
X6
JY-6351G-02-250
C1
47u/25V
VR1
W50K
C5
100n
C6
100n
3c
4d
2b
1a
5e
JY-6351G-02-250
X34
R49
3K6
6
5
MAIN-INSERT
C4
22P
R50
36K
7
C3
U1B
4580M
47u/25V
DFXOUT-R
DFXOUT-L
AUXSEND3
AUXSEND4
R27
120R
RN
TN
T
120R
R57
120R
R56
120R
R43
S
3c
4d
2b
1a
5e
X35
JY-6351G-02-250
DFX OUT
AUXSEND3
AUXSEND4
MONO
3c
4d
2b
1a
5e
X21
JY-6351G-02-250
R
R40
120R
R39
120R
R38
120R
R42
120R
R41
120R
R47
120R
R46
120R
R48
120R
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
3c
R
4d
RN
2b
TN
1a
T
5e
S
JY-6351G-02-250
DIR-OUT1
DIR-OUT2
X19
X20
X24
X25
DIRECT1
DIRECT2
AUX SEND1
AUX SEND2
AUX SEND
AUX SEND3
AUX SEND4
R15
120R
R12
120R
R16
120R
R13
120R
3c
R
4d
RN
2b
TN
1a
T
5e
S
X7
JY-6351G-02-250
3c
R
4d
RN
2b
TN
1a
T
5e
S
X8
JY-6351G-02-250
DIRECT1
DIRECT
DIRECT2
L12PU1
L12PU1-2 SCH
DIR-OUT3
DIR-OUT4
Titel
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Date:
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DIRECT3
DIRECT4
A3
+VCC
-VCC
R17
120R
R14
120R
R18
120R
R37
120R
PCB# L12PU1.PCB
ALTO L12
1-Oct-2003
L12PU1.Sch
L12PU1(1/2)
2.0-18P-B24A
(TO L12MN1)
SUB1-L
SUB2-R
SUB3-L
SUB4-R
MAIN-L-2
MAIN-R-2
MAIN-INS-L
MAIN-INS-R
MAIN-L
MAIN-R
CTRL-R-L
CTRL-R-R
FOOTSW
MAIN-L-3
MAIN-R-3
MONO-LEVEL
AUXSEND1
AUXSEND2
AUXSEND3
AUXSEND4
DFXOUT-L
DFXOUT-R
AUXRTN1-L
AUXRTN1-R
AUXRTN2-L
AUXRTN2-R
AUXRTN3-L
AUXRTN3-R
AUXRTN4-L
AUXRTN4-R
EFXRTN-L
EFXRTN-R
R
RN
TN
T
S
JY-6351G-02-250
R
RN
TN
T
S
JY-6351G-02-250
3c
4d
2b
1a
5e
3c
4d
2b
1a
5e
X9
X18
Sheet
Drawn By:
CN3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
2.5-14P-B24A
(TO L12MN1)
CN2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
DIRECT3
DIRECT4
RevisionModel No:
BOW
D
C
B
A
VER030530
12 of
STEREO AUX
D
RETURN1
LEFT 1
(MONO)
RIGHT 1
X22
JY-6351G-02-250
X26
JY-6351G-02-250
7654321
8
L12PU1-2(2/2)
STEREO AUX RETURN
STEREO AUX
3c
4d
2b
1a
5e
3c
4d
2b
1a
5e
AUXRTN1-L
AUXRTN1-R
AUXRTN1-L
AUXRTN1-R
RETURN2
LEFT 2
(MONO)
RIGHT 2
X27
JY-6351G-02-250
X28
JY-6351G-02-250
3c
4d
2b
1a
5e
3c
4d
2b
1a
5e
AUXRTN2-L
AUXRTN2-R
AUXRTN2-L
AUXRTN2-R
STEREO AUX
RETURN3
LEFT 3
(MONO)
JY-6351G-02-250
RIGHT 3
JY-6351G-02-250
X23
X29
STEREO AUX
3c
4d
2b
1a
5e
3c
4d
2b
1a
5e
AUXRTN3-L
AUXRTN3-R
AUXRTN3-L
AUXRTN3-R
RETURN4
LEFT 4
(MONO)
RIGHT 4
X30
JY-6351G-02-250
X31
JY-6351G-02-250
3c
4d
2b
1a
5e
3c
4d
2b
1a
5e
AUXRTN4-L
EFXRTN-L
EFXRTN-R
AUXRTN4-R
D
C
R11
120R
2.5-14P-B24A
(TO L12PU2)
R36
120R
CN1
DIR-OUT4
DIR-OUT3
DIR-OUT2
DIR-OUT1
B
MAIN-R-2
MAIN-R-3
MAIN-L-2
MAIN-L-3
A
MAIN-R-2
MAIN-R-3
MAIN-L-2
MAIN-L-3
SW1A
PS-42E85L
P
SW1C
PS-42E85L
1 2 3 4 5 6 78
1
2
3
4
5
R28
120R
1
2
3
7
8
9
R29
120R
R30
120R
R54
5K1
R44
120R
R51
5K1
P
SW1B
PS-42E85L
P
SW1D
PS-42E85L
4
5
6
10
11
12
R31
120R
R32
120R
R33
120R
R52 5K1
R45
120R
R53
5K1
R35
120R
R34
120R
R
RN
TN
T
S
R
RN
TN
T
S
3c
4d
2b
1a
5e
3c
4d
2b
1a
5e
2
3
1
2
3
1
MAIN R (UN B AL)
X16
JY-6351G-02-250
MAIN L (UNBAL)
X17
JY-6351G-02-250
X32
JY-5030-030G
X33
JY-5030-030G
SUB1-L
MAIN OUT
(BALANCED)
RIGHT
SUB2-R
LEFT
R1
120R
R2
120R
SUB- NS1
R19
120R
R21
120R
R22
120R
SUB- NS2
R20
120R
R
RN
TN
T
S
R
RN
TN
T
S
R
RN
TN
T
S
R
RN
TN
T
S
3c
4d
2b
1a
5e
3c
4d
2b
1a
5e
3c
4d
2b
1a
5e
3c
4d
2b
1a
5e
X1
JY-6351G-02-250
INSERT-SUB1
X10
JY-6351G-02-250
X11
JY-6351G-02-250
INSERT-SUB2
X12
JY-6351G-02-250
SUB3-L
SUB4-R
Titel
Size
Date:
File:
A3
R3
120R
R4
120R
SUB- NS3
R23
120R
R25
120R
R26
120R
SUB- NS4
R24
120R
PCB# L12MN1.PCB
11-Jun-2003
L12PU1-2.Sch
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
R
4d
RN
2b
TN
1a
T
5e
S
ALTO L12
X2
JY-6351G-02-250
INSERT-SUB3
X13
JY-6351G-02-250
X14
JY-6351G-02-250
INSERT-SUB4
X15
JY-6351G-02-250
Sheet
Drawn By:
RevisionModel No:
BOW
22of
VER030530
C
B
A
D
C
B
A
1110987654321
PH PWR
R1
R2
6K81
6K81
R10
4R7
1
MIC 1
LINE IN1
INSERT 1
MIC 2
LINE IN2
INSERT 2
MIC 3
LINE IN3
INSERT 3
MIC 4
LINE IN4
INSERT 4
3
2
4
X3
JY 5042 030G
3c
R
4d
RN
2b
TN
1a
T
5e
S
X1
JY 6351G 02 250
MIC GAIN 0~-60dB
LINE IN GAIN +15~-45dB
3c
4d
2b
1a
5e
X2
JY 6351G 02 250
1
3
2
4
X3_1
JY 5042 030G
3c
R
4d
RN
2b
TN
1a
T
5e
S
X1_1
JY 6351G 02 250
MIC GAIN 0~-60dB
LINE IN GAIN +15~-45dB
3c
4d
2b
1a
5e
X2_1
JY 6351G 02 250
1
3
2
4
X3_2
JY 5042 030G
3c
R
4d
RN
2b
TN
1a
T
5e
S
X1_2
JY 6351G 02 250
MIC GAIN 0~-60dB
LINE IN GAIN +15~-45dB
3c
4d
2b
1a
5e
X2_2
JY 6351G 02 250
1
3
2
4
X3_3
JY 5042 030G
3c
R
4d
RN
2b
TN
1a
T
5e
S
X1_3
JY 6351G 02 250
MIC GAIN 0~-60dB
LINE IN GAIN +15~-45dB
3c
4d
2b
1a
5e
X2_3
JY 6351G 02 250
1 2 3 4 5 6 7 8 9 10 11 12
R104
120R
120R
R104_2
120R
R104_3
120R
R11
4R7
C9
22u/35V
R1_1
6K81
R10_1
4R7
R11_1
4R7
C9_1
22u/35V
R104_1
R1_2
6K81
R10_2
4R7
R11_2
4R7
C9_2
22u/35V
R1_3
6K81
R10_3
4R7
R11_3
4R7
C9_3
22u/35V
330P
C10
22u/35V
330P
C10_1
22u/35V
330P
C10_2
22u/35V
C11_3
330P
C10_3
22u/35V
C11
PH PWR
C11_1
PH PWR
C11_2
PH PWR
C12
47u/63V
R13
5K62
R2_1
6K81
C12_1
47u/63V
R13_1
5K62
R2_2
6K81
C12_2
47u/63V
R14_2
R13_2
5K62
R15_2
1K50
R2_3
6K81
C12_3
47u/63V
R13_3
5K62
R15_3
R14
5K62
R15
1K50
R14_1
5K62
R15_1
1K50
5K62
R14_3
5K62
1K50
C13
47u/63V
C13_1
47u/63V
C13_2
47u/63V
C13_3
47u/63V
+VCC
R3
C1
2K49
10n
TR3
HR
R17
20K
R20
470R
VCC
TR1
A1316
C14
1n
R16
1K50
R7
2K49
VCC
+VCC
R3_1
C1_1
2K49
10n
TR3_1
HR
R17_1
20K
R20_1
470R
VCC
TR1_1
A1316
C14_1
1n
R16_1
1K50
R7_1
2K49
VCC
+VCC
R3_2
C1_2
2K49
10n
TR3_2
HR
R17_2
20K
R20_2
470R
VCC
TR1_2
A1316
C14_2
1n
R16_2
1K50
R7_2
2K49
VCC
+VCC
R3_3
C1_3
2K49
10n
TR3_3
HR
R17_3
20K
R20_3
470R
VCC
TR1_3
A1316
C14_3
1n
R16_3
1K50
R7_3
2K49
VCC
C2
10n
470R
TR2
A1316
C2_1
10n
R21_1
470R
TR2_1
A1316
C2_2
10n
R21_2
470R
TR2_2
A1316
C2_3
10n
R21_3
470R
TR2_3
A1316
R21
C15
1n
C15_
1n
C15_2
1n
C15_3
1n
+VCC
+VCC
+VCC
+VCC
VCC
VCC
VCC
VCC
R4
2K49
TR4
HR
R9
2K49
R4_1
2K49
TR4_1
HR
R9_1
2K49
R4_2
2K49
TR4_2
HR
R9_2
2K49
R4_3
2K49
TR4_3
HR
R9_3
2K49
+VCC
+VCC
+VCC
+VCC
R5
2K49
D1
BAS316
R23
5K11
R22
5K11
VCC
R5_1
2K49
D1_1
BAS316
R23_1
5K11
R22_1
5K11
VCC
R5_2
2K49
D1_2
BAS316
R23_2
5K11
R22_2
5K11
VCC
R5_3
2K49
D1_3
BAS316
R23_3
5K11
R22_3
5K11
VCC
R8
2K49
R8_1
2K49
R8_2
2K49
R8_3
2K49
+VCC
+VCC
+VCC
+VCC
R6
2K49
TR5
HR
R6_1
2K49
TR5_1
HR
R6_2
2K49
TR5_2
HR
R6_3
2K49
TR5_3
HR
3
2
C4
22P
5
6
3
2
C4_1
22P
5
6
3
2
C4_2
22P
5
6
3
2
C4_3
22P
5
6
C5
22P
C5_1
22P
C5_2
22P
C5_3
22P
U1A
4580M
U1_1A
4580M
U1_2A
4580M
U1_3A
4580M
U1B
4580M
U1_1B
4580M
U1_2B
4580M
U1_3B
4580M
C7
C17
0.22u/50V
6
5
U2_1A
4580M
C17_1
0.22u/50V
6
5
U2_2A
4580M
C17_2
0.22u/50V
6
5
U2_3A
4580M
C17_3
0.22u/50V
6
5
C6
22P
R25
5K11
C6_1
22P
R25_1
5K11
C6_2
22P
R25_2
5K11
C6_3
22P
R25_3
5K11
47u/25V
1
U2B
4580M
C19
1000u/10V
C7_1
47u/25V
1
U2_1B
4580M
C19_1
1000u/10V
C7_2
47u/25V
1
U2_2B
4580M
C19_2
1000u/10V
C7_3
47u/25V
1
U2_3B
4580M
C19_3
1000u/10V
R18
20K
C18
0.22u/50V
R29
6K8
47u/25V
7
R18_1
20K
C18_1
0.22u/50V
R29_1
6K8
47u/25V
7
R18_2
20K
C18_2
0.22u/50V
R29_2
6K8
47u/25V
7
R18_3
20K
C18_3
0.22u/50V
R29_3
6K8
47u/25V
7
C8
C8_1
C8_2
C8_3
R19
20K
R19_1
20K
R19_2
20K
R19_3
20K
L CUT1 OF
L CUT1 ON
TRIM2 CH1
TRIM1 CH1
INS2 CH1
INS1 CH1
L CUT2 OF
L CUT2 ON
TRIM2 CH2
TRIM1 CH2
INS2 CH2
INS1 CH2
L CUT3 OF
L CUT3 ON
TRIM2 CH3
TRIM1 CH3
INS2 CH3
INS1 CH3
L CUT4 OF
L CUT4 ON
TRIM2 CH4
TRIM1 CH4
INS2 CH4
INS1 CH4
MIC 5/6
LINE IN 5/6
LEFT(MONO)
RIGHT
MIC 7/8
LINE IN 7/8
LEFT(MONO)
X6
JY 5042 030G
JY 6351G 02 250
JY 6351G 02 250
X6_1
JY 5042 030G
RIGHT
1
3
2
4
3c
4d
2b
1a
5e
X4
3c
4d
2b
1a
5e
X5
1
3
2
4
X4_1
JY 6351G 02 250
X5_1
JY 6351G 02 250
PH PWR
R38
R39
6K81
330P
R38_1
6K81
R35_1
4R7
R36_1
4R7
C62
PH PWR
C62_1
330P
6K81
C36
47u/63V
C36_1
47u/63V
R40
1K50
C58
100P
C61
C59
100P
C60
100P
R39_1
6K81
C37
47u/63V
100P
C37_1
47u/63V
R40_1
1K50
C58_1
100P
C61_1
100P
C59_1
100P
C60_1
100P
R35
4R7
R36
4R7
R
RN
TN
T
S
R
RN
TN
T
S
3c
R
4d
RN
2b
TN
1a
T
5e
S
3c
R
4d
RN
2b
TN
1a
T
5e
S
VCC
R66
18K
C47
R67
18K
C46
22P
R68
18K
22P
R69
18K
C38
10n
R42
20K
C40
1n
2K49
VCC
R66_1
18K
R68_1
18K
C47_1
22P
R67_1
18K
R69_1
18K
C46_1
22P
R48
C38_1
10n
R42_1
20K
C40_1
1n
R48_1
2K49
+VCC
VCC
TR6
A1316
+VCC
VCC
R49
2K49
TR8
HR
R55
470R
R41
1K50
TR6_1
A1316
2
3
R70
10K
6
5
R71
10K
R49_1
2K49
TR8_1
HR
R55_1
470R
R41_1
1K50
2
3
6
5
C48
22P
C49
22P
C48_1
22P
R70_1
10K
R71_1
10K
C39
10n
R56
470R
TR7
A1316
C41
1n
NJM4580M
NJM4580M
C39_1
10n
470R
TR7_1
A1316
C49_1
22P
+VCC
R51
2K49
TR9
HR
R50
2K49
VCC
R73
20K
R72
22K
1
U5A
R75
20K
R74
22K
7
U5B
+VCC
TR9_1
HR
R56_1
C41_1
2K49
1n
VCC
R73_1
20K
R72_1
22K
1
U5_1A
NJM4580M
R75_1
20K
R74_1
22K
7
U5_1B
NJM4580M
47u/25V
R51_1
2K49
R50_1
+VCC
R52
2K49
D2
BAS316
C56
C57
47u/25V
+VCC
C56_1
47u/25V
47u/25V
R58
5K11
R57
5K11
VCC
R52_1
2K49
D2_1
BAS316
VCC
C57_1
R53
2K49
R58_1
5K11
R57_1
5K11
+VCC
+VCC
R53_1
2K49
R54
2K49
TR10
HR
R45
20K
R46
20K
R54_1
2K49
TR10_1
HR
R45_1
20K
R46_1
20K
C42
22P
3
2
5
6
C43
22P
3
2
C42_1
22P
5
6
U3A
4580M
C43_1
22P
U3_1A
4580M
U3B
4580M
4580M
1
7
U3_1B
C44
22P
R59
5K11
R61
10K0
R62
10K0
C44_
22P
R59_1
5K11
1
R61_1
10K0
R62_1
10K0
7
3
2
R64
1K3
C50
0.22u/50V
R63
62K
R37
4R7
3
2
R64_1
1K3
C50_1
0.22u/50V
R63_1
62K
R37_1
4R7
U4A
4580M
C51
0.22u/50V
6
5
U4_1A
4580M
C51_1
0.22u/50V
6
5
C45
22P
R60
5K11
R47
C45_1
22P
R60_1
5K11
47u/25V
1
U4B
4580M
C53
1000u/10V
20K
1
U4_1B
4580M
C53_1
1000u/10V
R47_1
20K
C54
R43
20K
C52
0.22u/50V
R65
6K8
47u/25V
7
C54_1
47u/25V
R43_1
C52_1
0.22u/50V
R65_1
6K8
7
C55
20K
C55_1
47u/25V
R44
20K
R44_1
20K
Titel
Size
Date
File
L CUT5 OF
L CUT5 ON
TRIM2 CH5
TRIM1 CH5
INS CH5 6
INS CH5
INS CH6
L CUT OF
L CUT ON
TRIM2 CH7
TRIM1 CH7
INS CH7 8
INS CH7
INS CH8
A3
MAIN INPUT STAGE
PCB# L12PU2.PCB
ALTO L12
11-Jun-2003
L12PU2.Sch
PU2
L12PU2-2.SCH
3
C3
2
22P
U2A
4580M
R24
5K11
1
R26
10K0
R28
1K3
R27
10K0
C16
0.22u/50V
R24_1
5K11
R26_1
10K0
R27_1
10K0
R24_2
5K11
R26_2
10K0
R27_2
10K0
R24_3
5K11
R26_3
10K0
R27_3
10K0
C3_1
22P
C3_2
22P
C3_3
22P
R30
62K
R12
4R7
3
2
R28_1
1K3
C16_1
0.22u/50V
R30_1
62K
R12_1
4R7
3
2
R28_2
1K3
C16_2
0.22u/50V
R30_2
62K
R12_2
4R7
3
2
R28_3
1K3
C16_3
0.22u/50V
R30_3
62K
R12_3
4R7
7
1
7
1
7
1
7
12
L12PU2
RevisionModel No
VER030530
BOW
21of
Sheet
Drawn By
D
C
B
A
1110987654321
12
L12PU2-2
C111
L(WHITE)
R(RED)
22P
R92
10K
2
3
C113
22P
R94
10K
2
3
C112
22P
R93
10K
2
3
C114
22P
R95
10K
2
3
SCP6873NS3232
3
U8A
BA15218N
U9A
BA15218N
U10A
BA15218N
U11A
BA15218N
TAPE OUTTAPE IN
X13
1 4
2 5
R96
U8B
BA15218N
U9B
BA15218N
U10B
BA15218N
U11B
BA15218N
120R
7
R98
120R
R100
120R
7
R102
120R
R97
120R
7
R99
120R
R101
120R
7
R103
120R
R31
1K
R32
1K
PHONES OUTPUT
MAIN L 3
MAIN R 3
2TKIN L
2TKIN R
6
1
5
6
1
5
6
1
5
6
1
5
6
R76
C91
100P
C93
100P
C95
100P
C97
100P
C92
100P
C94
100P
C96
100P
C98
100P
10K
R78
C99
22P
R80
10K
R82
C101
22P
10K
10K
R77
10K
R79
C100
22P
R81
10K
R83
C102
22P
10K
10K
D
LINE IN 9
LEFT(MONO)
LINE IN 10
RIGHT
C
LINE IN 11
LEFT(MONO)
LINE IN 12
RIGHT
B
X7
JY 6351G 02 250
X8
JY 6351G 02 250
X9
JY 6351G 02 250
X10
JY 6351G 02 250
3c
R
4d
RN
2b
TN
1a
T
5e
S
R
3c
4d
RN
2b
TN
1a
T
5e
S
3c
R
4d
RN
2b
TN
1a
T
5e
S
R
3c
4d
RN
2b
TN
1a
T
5e
S
C103
22P
R88
C107
20K
C104
22P
C106
22P
U6A
4580M
R90
20K
U6B
4580M
R89
4580M
20K
U7A
4580M
R91
20K
U7B
47u/25V
1
7
1
7
C109
47u/25V
C108
47u/25V
C110
47u/25V
INS-CH9
INS-CH10
INS-CH11
INS-CH12
2
3
R84
10K
C105
22P
6
5
R86
10K
2
3
R85
10K
6
5
R87
10K
PHONES R
PHONES L
3c
4d
2b
1a
5e
X11
JY-6351G-02-250
3c
4d
2b
1a
5e
X12
JY-6351G-02-250
PHONES A
PHONES B
L CUT1 OF
L CUT1 ON
TRIM2 CH1
TRIM1 CH1
INS2 CH1
INS1 CH1
PH PWR
L CUT2 OF
L CUT2 ON
TRIM2 CH2
TRIM1 CH2
INS2 CH2
INS1 CH2
L CUT3 OF
L CUT3 ON
TRIM2 CH3
TRIM1 CH3
INS2 CH3
INS1 CH3
+VCC
L CUT4 OF
L CUT4 ON
TRIM2 CH4
TRIM1 CH4
INS2 CH4
INS1 CH4
VCC
L CUT5 OF
L CUT5 ON
TRIM2 CH5
TRIM1 CH5
INS CH5 6
INS CH5
INS CH6
L CUT7 OF
L CUT7 ON
TRIM2 CH7
TRIM1 CH7
INS CH7 8
INS CH7
INS CH8
2TKIN R
2TKIN L
MAIN R 3
MAIN L 3
PHONES L
PHONES R
VCC
+VCC
INS-CH12
INS-CH11
INS-CH10
INS-CH9
CN1
2.5 14P B24A
(TO L12MN1)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
CN2
2.5 14P B24A
(TO L12MN1)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
CN3
2.5 14P B24A
(TO L12MN1)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
CN4
2.5 14P B24A
(TO L12MN1)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
D
C
B
C24
U1_3C
4580M
100n
84
C25
100n
+VCC
VCC
A
1 2 3 4 5 6 7 8 9 10 11 12
U2_3C
4580M
C26
100n
84
C27
100n
U1_2C
4580M
C28
100n
84
C29
100n
U2_2C
4580M
C30
100n
84
C31
100n
U1_1C
4580M
C32
100n
84
C33
100n
84
U2_1C
4580M
C34
100n
C35
100n
84
U3_1C
4580M
C63
100n
C64
100n
U4_1C
4580M
C65
100n
84
C66
100n
U5_1C
4580M
C67
100n
84
C68
100n
U1C
4580M
C69
100n
84
C70
100n
U2C
4580M
C71
100n
84
C72
100n
U3C
4580M
C73
100n
84
C74
100n
U4C
4580M
C75
100n
84
C76
100n
U5C
4580M
C77
100n
84
C78
100n
U6C
4580M
C79
100n
84
C80
100n
U7C
4580M
C81
100n
84
C82
100n
U8C
4580M
C83
100n
84
C84
100n
U9C
4580M
C85
100n
84
C86
100n
84
U10C
4580M
C89
100n
C90
100n
U11C
4580M
C87
100n
84
C88
100n
A
Titel
MAIN INPUT STAGE
PCB# L12PU2.PCB
Size
Date
File
A4
11-Jun-2003
L12PU2-2.Sch
ALTO L12
Sheet
Drawn By
RevisionModel No
VER030530
22of
BOW
321
4
CH1
CH1.SCH
D
LEFT-BUS
RIGHT-BUS
PGND
SUB1
CH2
CH2.SCH
CH3
CH3.SCH
C
SUB2
SUB3
SUB4
-VCC
AFL-L
AFL-R
SOLO(PFL)
AUX1
AUX2
AUX4
AUX3
LOGIC
+VCC
PH PWR
2.5-14P-B24A
(TO L12MN1)
CN4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
L-CUT1-OF
L-CUT1-ON
TRIM2-CH1
TRIM1-CH1
INS2-CH1
INS1-CH1
PH PWR
L-CUT2-OF
L-CUT2-ON
TRIM2-CH2
TRIM1-CH2
INS2-CH2
INS1-CH2
CN1
2.0-14P-B24A
(TO L12PU2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
CN2
L12MN2(1/5)
D
C
2.0-14P-B24A
(TO L12PU2)
CH4
CH4.SCH
2.0-5P-B24A
(TO L12PU1)
CN3
DIR-OUT4
DIR-OUT3
DIR-OUT2
DIR-OUT1
B
1
2
3
4
5
L-CUT3-OF
L-CUT3-ON
TRIM2-CH3
TRIM1-CH3
INS2-CH3
INS1-CH3
+VCC
L-CUT4-OF
L-CUT4-ON
TRIM2-CH4
TRIM1-CH4
INS2-CH4
INS1-CH4
-VCC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
B
C14_1
100n
U4C
LM393
84
U4_3C
LM393
C14_3
100n
84
U4_2C
LM393
C14_2
100n
84
U3_2C
4580M
C15_2
100n
84
U4_1C
LM393
C16_2
100n
A
1 2 34
PGND
C14
100n
84
+RVCC
U3C
4580M
-RVCC
C15
100n
84
C24
R52
47R
47uF
C25
47uF
C16
R53
47R
100n
Titel
Size
Date:
File:
A4
+VCC
C26
47uF
C27
PGND
47uF
-VCC
11-Jun-2003
L12MN2.Sch
PCB# L12MN2.PCB
ALTO L12
Sheet
Drawn By:
A
RevisionModel No:
VER030530
51of
BOW
7654321
8
L12MN2-CH1(2/5)
D
C2
47u/25V
INS2-CH1
INS2-CH1
C1
682(M)
VR3A
500KC
C
3K
R21
6K2
R1
(SOLO)
2
SW4A
PS-42E85L
LO-CUT-CH1
B
TRIM-CH1
L-CUT1-ON
L-CUT1-OF
VR11
O10K
VR2
B50K
5
6
C10
152(M)
VR3B
500KC
LD1
YEL
1
3
D1
BAS316
(LOGIC=2.0V or 0.5V)
3
1
SW PS-22E85L-2
SW2A
MID (FREQ=100Hz-8K)
C5 22P
R2
10K
LOGIC
TRIM2-CH1
TRIM1-CH1
R6
5K1
U1B
4580M
2
R22
6K2
R23
2K2
2
3
7
-VCC
LOGIC
INS1-CH1
U3A
4580M
10K
U1A
4580M
PGND
R3
R41
100K
2
3
6.8n(M)
1
C11
33n(M)
R42
100K
C7
R24
5K6
D2
4148
EQ HI (12K)
VR1
B50K
R18
3K9
R4
10K
VR4
B50K
LO (80Hz)
R46
10K
PGND
PGND
1
D3
4148
C21
1uF
PGND PGND
C8
6.8n(M)
C12
33n(M)
R25
5K6
R44
82R
R43
8K2
DIR-OUT1
+RVCC
R47
10K
+RVCC
R45
10K
2
3
5
6
U4A
3
2
393
C6
22P
R19
1M
R7
TR1
HR
5
PGND
5K1
VR5A
10KD
C28
47u/25V
+VCC
R26
3K3
D4
4148
LD3
LED-2P
綠紅
R51
1K
LD2
RED
6
5
1
3
PS-22E85L-2
SW1B
4
LEVEL
C23
470P
TR2
7002
6
C3
47u/25V
1
U2A
4580M
U4B
393
8
4
R50
7
27K
C22
1uF
R48
PGND
10K
R49
1
4K7
R40
15K
MUTE
R5
10K
C9
22P
U2B
4580M
PS-22E85L-2
SW1A
2
5
PAN
R29
4K7
R20
12K
7
C4
47u/25V
R30
4K7
SW4B
PS-42E85L
4
6
SW3A
PS-22E85L
2
SW3B
PS-22E85L
5
1
3
4
6
AUX1/2 PRE/POST
VR6
W50K
R14
6K8
R15
6K8
R16
6K8
R17
6K8
R8
R9
R10
R11
R12
R13
R27
R28
5K1
5K1
5K1
5K1
5K1
5K1
6K8
6K8
SW7A
PS-22E85L
2
SW7B
PS-22E85L
5
SW6A
PS-22E85L
2
SW6B
PS-22E85L
5
SW5A
PS-22E85L
2
SW5B
PS-22E85L
5
SW4C
PS-42E85L
8
SW4D
PS-42E85L
11
AUX-POST
VR7
W50K
AUX-PRE
VR9
W50K
1
3
4
6
1
3
4
6
1
3
4
6
7
9
10
12
AUX-POST
VR8
W50K
AUX-PRE
VR10
W50K
LEFT-BUS
RIGHT-BUS
SUB1
SUB2
SUB3
SUB4
AFL-L
AFL-R
SOLO(PFL)
AUX3
AUX4
AUX1
AUX2
D
C
B
C17
100n
+VCC
A
1 2 3 4 5 6 78
-VCC
84
U2C
4580M
C18
100n
84
U1C
4580M
C19
100n
C20
100n
Titel
Size
Date:
File:
A3
PCB# L12MN2 PCB
ALTO L12
12-Jul-2003
CH1.Sch
Sheet
Drawn By:
RevisionModel No:
BOW
52of
A
VER030712
7654321
8
L12MN2CH2(3/5)
EQ HI (12K)
INS2-CH2
C2_1
47u/25V
D
INS2-CH2
C1_1
682(M)
VR3_1A
500KC
C
R1_1
3K
R21_1
6K2
(SOLO)
2
SW4_1A
PS-42E85L
LO-CUT-CH2
TRIM-CH2
B
L-CUT2-ON
L-CUT2-OF
VR11_1
O10K
VR2_1
B50K
5
6
C10_1
152(M)
VR3_1B
500KC
LD1_1
YEL
1
3
D1_1
BAS316
(LOGIC=2.0V or 0.5V)
3
1
SW PS-22E85L-2
SW2_1A
TRIM2-CH2
TRIM1-CH2
MID (FREQ=100Hz-8K)
C5_1 22P
R2_1
10K
LOGIC
R6_1
5K1
U1_1B
4580M
2
R22_1
6K2
R23_1
2K2
LOGIC
2
3
7
-VCC
INS1-CH2
U3B
4580M
R3_1
10K
U1_1A
4580M
PGND
R42_1
100K
6
5
C7_1
6.8n(M)
1
C11_1
33n(M)
R41_1
100K
R24_1
5K6
D2_1
4148
VR1_1
B50K
VR4_1
B50K
LO (80Hz)
PGND
7
D3_1
4148
C21_1
1uF
C8_1
6.8n(M)
R18_1
3K9
R4_1
10K
C12_1
33n(M)
R25_1
5K6
R46_1
10K
PGND
R44_1
82R
PGND PGND
DIR-OUT2
+RVCC
+RVCC
R43_1
8K2
R47_1
10K
R45_1
10K
C6_1
22P
R19_1
1M
2
3
U4_1B
5
6
393
U4_1A
3
2
393
8
4
U2_1A
4580M
7
1
R48_1
PGND
10K
R49_1
4K7
C3_1
47u/25V
1
LEVEL
R50_1
27K
C22_1
1uF
PS-22E85L-2
4
6
TR1_1
HR
TR2_1
7002
C23_1
470P
SW1_1B
5
+VCC
PGND
R7_1
5K1
VR5_1A
10KD
C28_1
47u/25V
R26_1
3K3
LD2_1
RED
D4_1
4148
LD3_1
LED-2P
綠紅
R51_1
1K
1
3
6
5
R40_1
15K
C9_1
22P
U2_1B
4580M
PS-22E85L-2
SW1_1A
2
MUTE
R5_1
10K
5
SW3_1B
PS-22E85L
AUX1/2 PRE/POST
R20_1
12K
7
C4_1
47u/25V
SW4_1B
PS-42E85L
4
6
SW3_1A
PS-22E85L
2
5
PAN
R29_1
4K7
R30_1
4K7
R8_1
5K1
VR6_1
W50K
1
3
4
6
R14_1
6K8
R15_1
6K8
R16_1
6K8
R17_1
6K8
R9_1
5K1
R10_1
5K1
R11_1
5K1
R12_1
5K1
R13_1
5K1
R27_1
6K8
R28_1
6K8
SW7_1A
PS-22E85L
2
SW7_1B
PS-22E85L
5
SW6_1A
PS-22E85L
2
SW6_1B
PS-22E85L
5
SW5_1A
PS-22E85L
2
SW5_1B
PS-22E85L
5
SW4_1C
PS-42E85L
8
SW4_1D
PS-42E85L
11
AUX-POST
VR7_1
W50K
AUX-PRE
VR9_1
W50K
1
3
4
6
1
3
4
6
1
3
4
6
7
9
10
12
AUX-POST
VR8_1
W50K
AUX-PRE
VR10_1
W50K
LEFT-BUS
RIGHT-BUS
SUB1
SUB2
SUB3
SUB4
AFL-L
AFL-R
SOLO(PFL)
AUX3
AUX4
AUX1
AUX2
D
C
B
C17_1
100n
+VCC
-VCC
A
1 2 3 4 5 6 78
84
U2_1C
4580M
C18_1
100n
84
U1_1C
4580M
C19_1
100n
C20_1
100n
Titel
Size
Date:
File:
A3
PCB# L12MN2 PCB
ALTO L12
12-Jul-2003
CH2.Sch
Sheet
Drawn By:
RevisionModel No:
BOW
53of
A
VER030712
7654321
8
L12MN2CH3(4/5)
EQ HI (12K)
INS2-CH3
C2_2
47u/25V
D
INS2-CH3
C1_2
682(M)
VR3_2A
500KC
C
R1_2
3K
R21_2
6K2
(SOLO)
2
SW4_2A
PS-42E85L
LO-CUT-CH3
L-CUT3-ON
L-CUT3-OF
VR2_2
B50K
5
6
C10_2
152(M)
VR3_2B
500KC
LD1_2
YEL
1
3
D1_2
BAS316
(LOGIC=2.0V or 0.5V)
3
1
SW PS-22E85L-2
SW2_2A
TRIM2-CH3
MID (FREQ=100Hz-8K)
C5_2
22P
R2_2
10K
LOGIC
R6_2
5K1
U1_2B
4580M
R22_2
6K2
2
R23_2
2K2
LOGIC
2
3
4580M
7
-VCC
INS1-CH3
10K
U1_2A
VR11_2
B
TRIM-CH3
O10K
TRIM1-CH3
U3_2A
4580M
PGND
R3_2
R41_2
100K
2
3
6.8n(M)
1
C11_2
33n(M)
D2_2
R42_2
100K
C7_2
R24_2
5K6
4148
LO (80Hz)
PGND
1
D3_2
4148
C21_2
1uF
VR1_2
B50K
VR4_2
B50K
PGND PGND
R18_2
3K9
R4_2
10K
R46_2
10K
PGND
C8_2
6.8n(M)
C12_2
33n(M)
R25_2
5K6
R44_2
82R
R43_2
8K2
DIR-OUT3
+RVCC
R47_2
10K
+RVCC
R45_2
10K
2
3
U4_2B
5
6
393
U4_2A
3
2
393
C6_2
22P
R19_2
1M
8
4
U2_2A
4580M
7
R48_
10K
R49_2
1
4K7
PGND
C3_2
47u/25V
1
LEVEL
R50_2
27K
C22_2
1uF
PS-22E85L-2
SW1_2B
4
6
TR2_2
7002
C23_2
470P
TR1_2
HR
5
PGND
R7_2
5K1
VR5_2A
10KD
47u/25V
+VCC
D4_2
4148
LD3_2
LED-2P
綠紅
R51_2
1K
C28_2
R26_2
3K3
6
5
R40_2
15K
LD2_2
RED
1
3
R5_2
10K
C9_2
22P
U2_2B
4580M
PS-22E85L-2
SW1_2A
2
MUTE
5
SW3_2B
PS-22E85L
AUX1/2 PRE/POST
PAN
R20_2
12K
7
C4_2
47u/25V
SW4_2B
PS-42E85L
4
6
SW3_2A
PS-22E85L
2
5
R29_2
4K7
R30_2
4K7
1
3
4
6
VR6_2
W50K
R14_2
6K8
R15_2
6K8
R16_2
6K8
R17_2
6K8
R8_2
5K1
R9_2
5K1
R10_2
5K1
R11_2
5K1
R12_2
5K1
R13_2
5K1
R27_2
6K8
R28_2
6K8
SW7_2A
PS-22E85L
2
SW7_2B
PS-22E85L
5
SW6_2A
PS-22E85L
2
SW6_2B
PS-22E85L
5
SW5_2A
PS-22E85L
2
SW5_2B
PS-22E85L
5
SW4_2C
PS-42E85L
8
SW4_2D
PS-42E85L
11
AUX-POST
VR7_2
W50K
AUX-PRE
VR9_2
W50K
1
3
4
6
1
3
4
6
1
3
4
6
7
9
10
12
AUX-POST
VR8_2
W50K
AUX-PRE
VR10_2
W50K
D
LEFT-BUS
RIGHT-BUS
SUB1
SUB2
SUB3
C
SUB4
AFL-L
AFL-R
SOLO(PFL)
AUX3
AUX4
B
AUX1
AUX2
C17_2
100n
+VCC
-VCC
A
1 2 3 4 5 6 78
84
U2_2C
4580M
C18_2
100n
84
U1_2C
4580M
C19_2
100n
C20_2
100n
Titel
Size
Date:
File:
A3
PCB# L12MN2.PCB
ALTO L12
12-Jul-2003
CH3.Sch
Sheet
Drawn By:
RevisionModel No:
BOW
54of
A
VER030712
7654321
8
L12MN2CH4(5/5)
D
INS2-CH4
INS2-CH4
C2_3
47u/25V
C1_3
682(M)
VR3_3A
500KC
C
LO-CUT-CH4
L-CUT4-ON
L-CUT4-OF
R1_3
3K
R21_3
6K2
(SOLO)
2
SW4_3A
PS-42E85L
3
1
LD1_3
YEL
1
3
2
SW PS-22E85L-2
SW2_3A
TRIM2-CH4
TRIM-CH4
B
VR11_3
O10K
TRIM1-CH4
MID (FREQ=100Hz-8K)
VR2_3
B50K
VR3_3B
500KC
D1_3
BAS316
(LOGIC=2.0V or 0.5V)
INS1-CH4
R2_3
10K
R6_3
5K1
5
6
C10_3
152(M)
LOGIC
C5_3
22P
U1_3B
4580M
R22_3
6K2
R23_3
2K2
U3_2B
4580M
PGND
7
LOGIC
2
3
R41_3
100K
6
5
-VCC
D2_3
R42_3
100K
R3_3
10K
U1_3A
4580M
4148
C7_3
6.8n(M)
1
C11_3
33n(M)
R24_3
5K6
PGND
7
D3_3
4148
PGND PGND
LO (80Hz)
R46_3
10K
PGND
C21_3
1uF
VR1_3
B50K
VR4_3
B50K
R44_3
82R
R43_3
8K2
R18_3
3K9
R4_3
10K
+RVCC
+RVCC
C12_3
33n(M)
R47_3
10K
R45_3
10K
C8_3
6.8n(M)
R25_3
5K6
U4_3B
5
6
393
U4_3A
3
2
393
DIR-OUT4
8
4
7
1
R19_3
1M
2
3
R48_3
PGND
10K
R49_3
4K7
C6_3
22P
U2_3A
4580M
R50_3
27K
C22_3
1uF
C23_3
470P
C3_3
47u/25V
1
LEVEL
TR2_3
7002
PS-22E85L-2
4
6
TR1_3
HR
PGND
SW1_3B
D4_3
4148
LD3_3
LED-2P
綠紅
R51_3
1K
5
+VCC
R7_3
5K1
VR5_3A
10KD
C28_3
47u/25V
R26_3
3K3
LD2_3
RED
1
3
6
5
R40_3
15K
C9_3
22P
U2_3B
4580M
PS-22E85L-2
SW1_3A
MUTE
R5_3
10K
R29_3
PAN
R20_3
12K
7
C4_3
47u/25V
4K7
R30_3
4K7
2
SW4_3B
PS-42E85L
5
SW3_3A
PS-22E85L
SW3_3B
PS-22E85L
4
6
2
5
AUX1/2 PRE/POST
SW7_3A
R8_3
PS-22E85L
5K1
VR6_3
W50K
1
3
4
6
R14_3
6K8
R15_3
6K8
R16_3
6K8
R17_3
6K8
R9_3
5K1
R10_3
5K1
R11_3
5K1
R12_3
5K1
R13_3
5K1
R27_3
6K8
R28_3
6K8
2
SW7_3B
PS-22E85L
5
SW6_3A
PS-22E85L
2
SW6_3B
PS-22E85L
5
SW5_3A
PS-22E85L
2
SW5_3B
PS-22E85L
5
SW4_3C
PS-42E85L
8
SW4_3D
PS-42E85L
11
AUX-POST
VR7_3
W50K
AUX-PRE
VR9_3
W50K
1
3
4
6
1
3
4
6
1
3
4
6
7
9
10
12
AUX-POST
VR8_3
W50K
AUX-PRE
VR10_3
W50K
LEFT-BUS
RIGHT-BUS
SUB1
SUB2
SUB3
SUB4
AFL-L
AFL-R
SOLO(PFL)
AUX3
AUX4
AUX1
AUX2
D
C
B
EQ HI (12K)
C17_3
100n
+VCC
-VCC
A
1 2 3 4 5 6 78
84
U2_3C
4580M
C18_3
100n
84
U1_3C
4580M
C19_3
100n
C20_3
100n
Titel
Size
Date:
File:
A3
PCB# L12MN2.PCB
ALTO L12
12-Jul-2003
CH4.Sch
Sheet
Drawn By:
RevisionModel No:
BOW
55of
A
VER030712
321
4
L12STEREO
L12STEREO.SCH
D
CN4
2.0-14P-B24A
L12STEREO2
L12STEREO2.SCH
INS-CH9
INS-CH10
INS-CH11
INS-CH12
PHONE-R
PHONE-L
OTHER
OTHER.SCH
C
MAIN-L-2
MAIN-R -2
2TKIN-L
2TKIN-R
+VCC
-VCC
(TO L12PU2-CH9-12)
14
13
12
11
10
9
8
7
6
5
4
3
2
1
L-CUT5-OF
L-CUT5-ON
TRIM2-CH5
TRIM1-CH5
INS-CH5-6
PRE-CH5
PRE-CH6
L-CUT7-OF
L-CUT7-ON
TRIM2-CH7
TRIM1-CH7
INS-CH7-8
PRE-CH7
PRE-CH8
CN5
2.0-15P-B24A
(TO L12PU2-CH5-8)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
L12MN1
CN1
+VCC-VCCPH PWR +5VD
PGND
2.5-8P
DGND
D
1
2
3
4
5
6
7
8
C
2.0-20P-B24A
(TO L12MN2)
AUXRTN
AUXRTN.SCH
CN2
2.0-18P-B24A
(TO L12PU1)
SUB1-L
SUB2-R
AUXSEND
AUXSEND.SCH
B
CTRMETER
CTRMETER.SCH
SUB3-L
SUB4-R
MAIN-L-2
MAIN-R -2
MAIN-IN S-L
MAIN-IN S-R
MAIN-L
MAIN-R
CTRL-R-L
CTRL-R-R
FOOTSW
MAIN-L-3
MAIN-R -3
+VCC
-VCC
FOOTSW
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
MONO-LEVEL
AUXSEND1
AUXSEND2
AUXSEND3
DFX SEND
DFXOUT-L
DFXOUT-R
AUXRTN1-L
AUXRTN1-R
AUXRTN2-L
AUXRTN2-R
AUXRTN3-L
AUXRTN3-R
AUXRTN4-L
AUXRTN4-R
EFXRTN-L
EFXRTN-R
CN3
2.0-18P-B24A
(TO L12PU1)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
LEFT-BUS
RIGHT-BUS
PGND
SUB1
SUB2
SUB3
SUB4
-VCC
AFL-L
AFL-R
SOLO(PFL)
AUX1
AUX2
AUX4
AUX3
LOGIC
+VCC
PH PWR
CN7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
B
L12DSP
L12DSP.SCH
A
Titel
Size
A4
Date:
File:
1 2 34
MAIN INPUT STAGE
PCB# L12MN1.PCB
ALTO L12
18-Jun-2003
L12MN1.Sch
Sheet
Drawn By:
A
RevisionModel No:
VER030531
81of
BOW.
7654321
8
D
C
B
A
PRE CH5
PRE CH5
PRE CH6
PRE CH6
PRE CH7
PRE CH8
LO-CUT-CH7
VR1A
EQ HI (12KHz)
B50K
R7
C25
U1A
C27
U2A
4580M
4580M
R39
220K
R40
220K
C28
22P
U6A
C31
22P
U7A
R41
220K
R42
220K
1
1
1K8
R43
6K8
VR4A
B50K
LO(80Hz)
R11
1K8
R45
6K8
VR4B
B50K
LO(80Hz)
VR15A
B50K
LO(80Hz)
VR15B
B50K
LO(80Hz)
2
3
MID-LO(500Hz)
R6
1K8
2
3
MID-LO(500Hz)
R10
1K8
EQ HI (12KHz)
2
3
MID-LO(500Hz)
R17
1K8
EQ HI (12KHz)
2
3
MID-LO(500Hz)
R20
1K8
22P
4580M
22P
4580M
R21
10K
C21
1n(M)
R1
C1
220K
47u/25V
C5
47u/25V
L CUT5 ON
L CUT5 OF
PRE CH7
C8
47u/25V
PRE CH8
C9
47u/25V
L CUT7 ON
L CUT7 OF
1 2 3 4 5 6 78
C17
12n(M)
R35
22K
R5
1K8
C13
12n(M)
R27
10K
C22
1n(M)
R2
220K
C18
12n(M)
R36
22K
R9
1K8
C14
12n(M)
3
2
1
SW PS-22E85L-2
SW1A
R28
10K
C23
1n(M)
R3
220K
C19
12n(M)
R37
22K
R15
1K8
C15
12n(M)
R29
10K
C24
1n(M)
R4
220K
C20
12n(M)
R38
22K
R16
1K8
C16
12n(M)
3
2
1
SW PS-22E85L-2
SW8A
VR1B
B50K
VR12A
VR12B
VR2A
VR2B
B50K
B50K
B50K
B50K
EQ HI (12KHz)
INS CH5 6
VR13A
B50K
VR13B
B50K
INS CH7 8
R12
1K8
R47
6K8
R18
1K8
R48
6K8
R51
1M
R53
1M
R55
1M
R56
1M
R59
12K
R60
12K
R61
R62
12K
12K
C33
3.3n(M)
VR3A
B50K
HI-MID(3KHz)
C37
3.3n(M)
R63
47K
R44
C41
47n(M)
C34
3.3n(M)
VR3B
B50K
HI-MID(3KHz)
C38
3.3n(M)
R64
47K
C42
47n(M)
TRIM-CH5LO-CUT-CH5
C35
3.3n(M)
VR14A
B50K
HI-MID(3KHz)
C39
3.3n(M)
R65
47K
C36
3.3n(M)
VR14B
B50K
HI-MID(3KHz)
C40
3.3n(M)
R66
47K
TRIM-CH7
R8
1K8
6K8
R13
1K8
R46
6K8
R14
1K8
R50
6K8
C43
47n(M)
R19
1K8
R49
6K8
C44
47n(M)
R52
6
5
R54
6
5
TRIM2 CH5
TRIM1 CH5
2
R30
8K2
R31
8K2
TRIM2 CH7
TRIM1 CH7
LD1
YEL
(SOLO)
1
3
LOGIC
D1
BAS316
(LOGIC=2.0V or 0.5V)
R675
100K
U4A
4580M
LD2
YEL
(SOLO)
1
3
D2
BAS316
(LOGIC=2.0V or 0.5V)
R686
100K
U4B
4580M
PGND PGND PGND PGND
+VCC
VCC
LOGIC
VCC
2K2
R68
R676
100K
4
6
1
3
R687
100K
LOGIC
D5
BAS316
D8
BAS316
LOGIC
+VCC
PGND
1
D6
BAS316
C454
1uF
VCC
PS-42E85L
SW10B
5
PS-42E85L
SW10A
2
PGND
7
D17
BAS316
C457
1uF
PS-42E85L
1
3
PS-42E85L
4
6
PGND
+VCC
MUTE
PGND
3K3
R677
10K
R688
10K
R67
2K2
2
3
6
5
SW4A
PS-42E85L
22P
2
C26
1M
7
C2
U1B
47u/25V
4580M
C29
22P
R22
8K2
R23
8K2
1M
7
C6
U2B
47u/25V
4580M
VR11
O10K
SW11A
PS-42E85L
C30
22P
R57
1M
6
5
R58
6
5
1M
U6B
4580M
U7B
4580M
VR22
O10K
C32
22P
7
7
C10
47u/25V
C11
47u/25V
R69
SW3A
SW3B
2
MUTE
5
R679
82R
R678
8K2
R70
3K3
R747
8K2
R748
8K2
R690
82R
R689
8K2
LD3
RED
+RVCC
+RVCC
+RVCC
+RVCC
84
U1C
4580M
7
9
R749
R750
R681
10K
R680
10K
LD4
RED
R691
10K
R692
10K
8K2
8K2
SW3C
8
PS-42E85L
PGND
LEVEL
VR5A
10KD
LEVEL
VR5B
10KD
393
U5A
U5B
7
1
R682
10K
8
PGND
R683
4K7
R684
27K
C455
1uF
PGND
SW10C
PS-42E85L
5
6
8
3
2
4
393
7
9
47u/25V
LEVEL
VR16A
10KD
47u/25V
LEVEL
VR16B
10KD
393
R693
10K
U9A
U9B
7
1
U2C
4580M
R694
4K7
84
PGND
R695
27K
C458
1uF
C55
100N
C56
100N
5
6
8
3
2
4
393
C53
100N
C54
100N
47u/25V
47u/25V
C456
470P
C502
C503
C459
470P
C500
C501
R667
15K
R668
15K
R665
15K
R666
15K
TR9
7002
TR3
7002
U3C
4580M
R71
5K1
R72
5K1
TR2
HR
R685
1K
PGNDPGNDPGNDPGND
R79
5K1
R85
5K1
TR8
HR
R696
1K
C57
100N
84
C58
100N
2
3
6
5
D7
BAS316
LD39
LED-2P
綠紅
2
3
6
5
D18
BAS316
LD40
LED-2P
綠紅
C45
22P
R96
12K
47u/25V
1
U3A
4580M
C46
22P
R95
12K
7
C3
U3B
47u/25V
4580M
SW2A
PS-22E85L
2
SW2B
PS-22E85L
5
AUX1/2 PRE/POST
C47
22P
R97
12K
1
U8A
4580M
C48
22P
R98
12K
7
U8B
47u/25V
4580M
SW9A
PS-22E85L
2
SW9B
PS-22E85L
5
AUX1/2 PRE/POST
4580M
U6C
C4
R24
10K
C7
47u/25V
R32
10K
C12
84
1
3
4
6
C61
100N
R719
4K7
R25
10K
R720
4K7
1
3
4
6
C62
100N
R33
R721
4K7
10K
R722
4K7
BAL
84
U7C
4580M
BAL
VR6
W50K
C63
100N
C64
100N
VR17
W50K
84
U8C
4580M
R73
12K
R74
12K
R99
20K
R100
20K
R80
5K1
R81
5K1
R86
R87
R101
R102
12K
12K
20K
20K
R88
R94
R26
8K2
5K1
5K1
R34
8K2
C65
100N
C66
100N
SW7A
PS-22E85L
2
SW7B
PS-22E85L
5
SW4B
PS-42E85L
5
SW4C
PS-42E85L
8
SW4D
PS-42E85L
11
VR7
W50K
SW14A
PS-22E85L
2
SW14B
PS-22E85L
5
SW11B
PS-42E85L
5
SW11C
PS-42E85L
8
SW11D
PS-42E85L
11
VR18
W50K
VR8
W50K
VR19
W50K
1
3
4
6
4
6
7
9
10
12
LEFT BUS
RIGHT BUS
SOLO(PFL)
1
3
4
6
4
6
7
9
10
12
AFL L
AFL R
AUX1
AUX2
LEFT BUS
RIGHT BUS
AFL L
AFL R
SOLO(PFL)
AUX1
AUX2
CH5-8 (STEREO)
SW5A
R75
PS-22E85L
2
SW5B
PS-22E85L
5
SW6A
PS-22E85L
2
SW6B
PS-22E85L
5
VR9
W50K
W50K
SW12A
PS-22E85L
2
SW12B
PS-22E85L
5
SW13A
PS-22E85L
2
SW13B
PS-22E85L
5
VR20
W50K
ALTO L12
VR10
W50K
VR21
1
3
SUB1
4
6
SUB2
1
3
SUB3
4
6
SUB4
AUX3
AUX4
1
3
SUB1
4
6
SUB2
1
3
SUB3
4
6
SUB4
AUX3
AUX4
Sheet
Drawn By
Titel
Size
Date
File
R82
R83
R76
R77
R78
12K
12K
12K
12K
5K1
5K1
R84
R91
R92
R93
R89
R90
A3
12K
12K
12K
12K
5K1
5K1
L12STEREO(CH5-CH8)
PCB# L12MN1.PCB
12-Jul-2003
L12STEREO.Sch
D
C
B
A
RevisionModel No
VER030710
82of
BOW.
7654321
8
R201
5K1
7
47u/25V
7
47u/25V
7
7
84
U13C
4580M
LD7
RED
MUTE
C83
R154
5K1
R159
5K1
C92
LD8
RED
C122
47u/25V
C123
47u/25V
R162
5K1
R163
5K1
C137
100N
C138
100N
7
9
7
9
R184
1M
6
5
R186
1M
6
5
84
R188
1M
6
5
R189
1M
6
5
+VCC
+VCC
C82
22P
U12B
4580M
C91
22P
U13B
4580M
4580M
4580M
C135
100N
C136
100N
C113
U14B
C121
U15B
22P
22P
R199
3K3
R200
3K3
VR24A
R153
10K
R167
22K
R158
10K
R168
22K
R160
10K
C106
1n(M)
C107
12n(M)
R161
10K
C114
1n(M)
C115
12n(M)
B50K
VR24B
B50K
R169
22K
R170
22K
VR25A
VR25B
VR40A
B50K
VR40B
B50K
EQ HI (12KHz)
B50K
EQ HI (12KHz)
B50K
VR41A
B50K
VR41B
B50K
2
3
MID-LO(500Hz)
R138
1K8
2
3
MID-LO(500Hz)
R142
1K8
EQ HI (12KHz)
2
3
MID-LO(500Hz)
R146
1K8
EQ HI (12KHz)
2
3
MID-LO(500Hz)
R152
1K8
+VCC
VCC
C78
22P
220K
U12A
4580M
C87
22P
220K
U13A
4580M
C109
22P
U14A
4580M
C117
22P
U15A
4580M
R171
R172
220K
220K
R173
R174
U10C
4580M
1
1
84
R139
1K8
R183
1M
R175
6K8
VR27A
B50K
LO(80Hz)
R143
1K8
R185
1M
R177
6K8
VR27B
B50K
LO(80Hz)
R147
1K8
R179
6K8
VR43A
B50K
LO(80Hz)
R148
1K8
R181
6K8
VR43B
B50K
LO(80Hz)
C131
100N
C132
100N
R187
1M
R190
1M
R191
12K
R192
12K
R193
12K
R194
12K
U11C
4580M
C79
3.3n(M)
VR26A
B50K
HI-MID(3KHz)
C80
3.3n(M)
R195
47K
C88
3.3n(M)
VR26B
B50K
HI-MID(3KHz)
C89
3.3n(M)
R196
47K
C110
3.3n(M)
VR42A
B50K
HI-MID(3KHz)
C111
3.3n(M)
R197
47K
C118
3.3n(M)
VR42B
B50K
HI-MID(3KHz)
C119
3.3n(M)
R198
47K
C133
100N
84
C134
100N
R140
1K8
R176
6K8
C81
47n(M)
R144
1K8
R178
6K8
C90
47n(M)
C112
47n(M)
C120
47n(M)
1K8
R180
6K8
1K8
R182
6K8
R149
R150
U12C
4580M
R657
120R
C69
47u/25V
VR44A
R125
1K
C70
47u/25V
R126
1K
SW19D
11
W50K
R658
120R
R659
120R
VR44B
W50K
R660
120R
10
12
LD5
YEL
D
C67
INS CH9
INS CH10
C
47u/25V
C68
47u/25V
PS-42E85L
(LOGIC=2.0V or 0.5V)
R661
120R
C100
47u/25V
VR23A
W50K
C98
INS CH11
B
INS CH12
A
1 2 3 4 5 6 78
47u/25V
C99
47u/25V
SW20D
PS-42E85L
11
R662
R127
120R
1K
R663
120R
C101
47u/25V
VR23B
W50K
R664
R128
120R
1K
LD6
YEL
10
12
D4
BAS316
(LOGIC=2.0V or 0.5V)
(SOLO)
2
3
U10A
4580M
6
5
U10B
4580M
D3
BAS316
U11A
4580M
U11B
4580M
LOGIC
(SOLO)
LOGIC
2
3
6
5
R234
2K2
C71
C72
LOGIC
22P
22P
R233
2K2
C102
22P
C103
22P
R129
1K2
1
R130
1K2
7
LOGIC
VCC
1
7
R131
1K2
R132
1K2
C73
47u/25V
C74
47u/25V
VCC
47u/25V
47u/25V
C104
C105
R133
220K
R137
1K8
C77
12n(M)
R134
220K
R141
1K8
C86
12n(M)
R135
220K
C108
12n(M)
R136
220K
C116
12n(M)
R145
1K8
R151
1K8
C75
1n(M)
C76
12n(M)
C84
1n(M)
C85
12n(M)
U20A
4580M
PGND
R697
100K
2
3
PGND
MUTE
84
U14C
4580M
SW17C
8
PS-42E85L
4
6
PS-42E85L
SW17A
1
3
D19
BAS316
R698
100K
SW18C
8
PS-42E85L
4
6
PS-42E85L
1
3
C139
100N
C140
100N
C504
47u/25V
R669
PS-42E85L
SW17B
R751
5K1
R752
5K1
PGND
1
D25
BAS316
C460
1uF
PS-42E85L
SW18B
SW18A
5
2
5
R753
5K1
2
U20B
4580M
U15C
4580M
VR38A
15K
10KD
LEVEL
R202
5K1
C505
47u/25V
5
6
3
2
393
7
C463
1uF
PGND
D28
BAS316
393
U18A
8
4
R209
5K1
R671
15K
R214
5K1
C507
47u/25V
VR39B
10KD
LEVEL
C143
100N
C144
100N
U18B
R710
20K
PGND
R670
15K
7
R704
10K
1
R672
15K
VR38B
10KD
LEVEL
+RVCC
R702
R699
10K
20K
+RVCC
R703
PGND
R701
10K
150R
R700
8K2
C506
47u/25V
VR39A
10KD
LEVEL
R754
5K1
R708
100K
D27
BAS316
6
5
R709
100K
PGND PGND PGND PGND
C141
100N
84
C142
100N
84
U16C
4580M
PGND
R705
4K7
84
U17C
4580M
2
3
6
5
2
3
6
5
R711
150R
R712
8K2
R706
27K
C461
+RVCC
+RVCC
1uF
R713
10K
R714
10K
C145
100N
C146
100N
C95
22P
4580M
C94
22P
U16B
4580M
C462
470P
C125
22P
4580M
C126
22P
U17B
4580M
R226
12K
C97
47u/25V
1
U16A
R155
R225
10K
12K
7
C96
47u/25V
AUX1/2 PRE/POST
TR4
HR
TR1
7002
R227
12K
C127
47u/25V
1
U17A
R228
12K
7
C128
47u/25V
AUX1/2 PRE/POST
5
7
6
U19B
393
R715
10K
U19A
8
3
1
2
4
393
4K7
R156
10K
4K7
SW15A
PS-22E85L
2
SW15B
PS-22E85L
5
D26
BAS316
R707
1K
PGNDPGNDPGNDPGND
4K7
R165
10K
R164
10K
4K7
SW16A
PS-22E85L
2
SW16B
PS-22E85L
5
PGND
R716
4K7
R723
R724
綠紅
R725
R726
R717
27K
C464
1uF
1
3
4
6
LD41
LED-2P
C465
470P
CH9-12 (STEREO)
BAL
VR36
W50K
R203
10K
R204
10K
R229
15K
R230
15K
R210
4K7
R211
4K7
R157
8K2
SW25A
PS-22E85L
2
SW25B
PS-22E85L
5
SW19C
PS-42E85L
8
SW19B
PS-42E85L
5
SW19A
PS-42E85L
2
VR28
W50K
VR29
W50K
1
3
4
6
7
9
4
6
1
3
LEFT BUS
RIGHT BUS
AFL L
AFL R
SOLO(PFL)
AUX1
AUX2
BAL
SW26A
R215
PS-22E85L
2
SW26B
PS-22E85L
5
SW20C
PS-42E85L
8
SW20B
PS-42E85L
5
SW20A
PS-42E85L
2
VR32
W50K
VR33
W50K
1
3
4
6
7
9
4
6
1
3
LEFT BUS
RIGHT BUS
AFL L
AFL R
SOLO(PFL)
AUX1
AUX2
Titel
MAIN INPUT STAGE (CH9-CH12)
PCB# L12MN1.PCB
Size
A3
12-Jul-2003
Date
L12STEREO2.Sch
File
ALTO L12
10K
VR37
W50K
1
3
4
6
TR6
HR
TR5
7002
R718
1K
D29
BAS316
LD42
LED-2P
綠紅
R216
10K
R231
15K
R232
15K
R217
4K7
R224
4K7
R166
8K2
R205
10K
R206
10K
R207
10K
R208
10K
R212
4K7
R213
4K7
R220
10K
R221
10K
R222
10K
R223
10K
R218
4K7
R219
4K7
SW21A
PS-22E85L
2
SW21B
PS-22E85L
5
SW23A
PS-22E85L
2
SW23B
PS-22E85L
5
VR30
W50K
SW22A
PS-22E85L
2
SW22B
PS-22E85L
5
SW24A
PS-22E85L
2
SW24B
PS-22E85L
5
VR34
W50K
Sheet
Drawn By
VR31
W50K
VR35
W50K
1
3
SUB1
4
6
SUB2
1
3
SUB3
4
6
SUB4
AUX3
AUX4
1
3
SUB1
4
6
SUB2
1
3
SUB3
4
6
SUB4
AUX3
AUX4
RevisionModel No
VER030710
83of
BOW.
D
C
B
A
D
2TK TO MIX
SUB1
C
SUB2
SUB3
B
SUB4
A
+VCC
VCC
1 2 3 4 5 6 7 8 9 10 11 12
C239
47u/25V
2TKIN-L
2TKIN L
2TKIN R
2
3
R386
510R
2
3
R393
510R
2
3
R400
510R
2
3
R407
510R
84
U33C
4580M
84
U45C
4580M
C327
C325
100N
100N
C328
C326
100N
100N
U46 U47 U48 U49 U50 U51 U52 U53
U45
84
U34C
4580M
84
U46C
4580M
C329
100N
C330
100N
U34A
4580M
U35A
4580M
U36A
4580M
U37A
4580M
C245
22P
C249
22P
C253
22P
C257
22P
C331
100N
C332
100N
2TKIN-R
1
1
1
1
U35C
4580M
U47C
4580M
C237
100P
C238
100P
R387
20K
C247
47u/25V
R394
20K
C251
47u/25V
R401
20K
C255
47u/25V
R408
20K
C259
47u/25V
84
84
C333
100N
C334
100N
C240
47u/25V
SUB2
SUB4
84
U36C
4580M
84
U48C
4580M
C335
100N
C336
100N
R378
20K
R380
22K
R673
20K
R727
15K
R379
20K
R381
22K
R674
20K
R728
15K
SUB1
VR66
10KD
VR53
10KD
SUB3
VR54
10KD
VR55
10KD
84
U37C
4580M
84
U49C
4580M
C339
C337
C341
100N
100N
100N
C340
C338
C342
100N
100N
100N
2
3
6
5
C241
22P
C242
22P
U38C
4580M
U50C
4580M
R388
5K1
R395
5K1
R402
5K1
R409
5K1
84
84
C343
100N
C344
100N
U54
U33A
4580M
U33B
4580M
C345
100N
4580M
4580M
C346
100N
U55
84
U39C
84
U51C
2TK TO CR L
C243
47u/25V
1
R384
R382
18K
10K
2TK TO CR R
C244
47u/25V
7
R385
18K
R383
10K
C246
22P
6
5
U34B
4580M
C250
22P
6
5
U35B
4580M
C254
22P
6
5
U36B
4580M
C258
22P
6
5
U37B
4580M
84
U40C
U41C
4580M
4580M
84
U52C
U53C
4580M
4580M
C347
C351
C349
100N
100N
100N
C348
C352
C350
100N
100N
100N
U58 U59 U60 U61 U62 U63
U56 U57
SW36A
PS 22E85L
SW36B
PS 22E85L
R389
18K
7
C248
47u/25V
R396
18K
7
C252
47u/25V
R403
18K
7
C256
47u/25V
R410
18K
7
C260
47u/25V
84
84
C353
100N
C354
100N
C355
100N
C356
100N
84
U42C
4580M
84
U54C
4580M
C357
100N
C358
100N
LEFT BUS
RIGHT BUS
R391
R392
20K
R390
10K
R398
R399
20K
R397
10K
R405
R406
20K
R404
10K
R412
R413
20K
R411
10K
U43C
4580M
U55C
4580M
C359
100N
C360
100N
1110987654321
R475
9K76
R479
38K3
R483
15K
R487
6K04
R491
24K3
2
3
6
5
R476
1K18
R480
4K75
R484
1K96
R488
787R
R492
3K01
C269
22P
R428
20K
U40A
4580M
C270
22P
R429
20K
0.22uF
0.22uF
C298
2N2
C300
2N2
C302
22N
C304
C306
C297
2N2
U40B
4580M
2
3
2
3
2
3
2
3
2
3
C299
2N2
C301
22N
1
R729
10K
7
U52A
BA1458
R478
76K8
U53A
BA1458
R482
30K1
U54A
BA1458
C303
0.22uF
R486
12K1
U55A
BA1458
C305
0.22uF
U56A
BA1458
R730
10K
19K6
R490
48K7
R474
C468
22P
R731
10K
2
3
C469
22P
R732
10K
6
5
C285
R430
47u/25V
C286
10K
R434
10K
R432
49K9
C271
22P
6
5
U41B
BA1458
R431
10K
R435
10K
R433
49K9
C272
22P
6
5
U42B
BA1458
7
1
U78A
4580M
EQ VRL A EQ OPL A
47u/25V
7
U78B
4580M
EQ VRR A EQ OPR A
9 BAND EQ
EQ OPR B
R477
6KHZ L
10K
R495
19K1
R481
4KHZ L
10K
R499
7K5
R485
1KHZ L
10K
R503
30K1
R489
250HZ L
10K
R507
R493
10K
63HZ L
12K1
C275
R436
EQ VRL B
10K
C273
22P
2
3
7
2
3
U41A
BA1458
R437
10K
U42A
BA1458
C274
22P
1
R438
10K
EQ VRR B
1
R439
10K
C307
2N2
R494
38K3
U48B
C308
6
2N2
5
R496
BA1458
2K43
22P
6
5
R511
9K76
C279
22P
R448
49K9
6
5
2
3
U45A
BA1458
C280
22P
R449
49K9
BA1458
2
3
U46A
BA1458
BA1458
C281
22P
U46B
R451
10K
C282
22P
U45B
R450
10K
R512
1K18
7
C316
2N2
7
1
C315
R452
10K
R454
10K
2
3
1
R453
10K
R455
10K
6
5
2N2
R510
19K6
U52B
6
5
BA1458
R440
49K9
BA1458
EQ OPL B
C276
22P
U44A
BA1458
U44B
BA1458
U43A
C277
22P
U43B
BA1458
C278
22P
1
R444
1
R445
10K
7
EQ OPR A
EQ VRL C
10K
7
EQ VRR C
R447
10K
R446
10K
2
3
R442
10K
6
5
R441
49K9
2
3
R443
10K
6
5
EQ OPR B
C317
2N2
R514
76K8
U53B
R516
4K75
C318
2N2
6
5
BA1458
R497
7
8KHZ R
10K
R515
38K3
C319
R500
976R
C310
22N
C309
22N
R498
15K
U49B
6
5
BA1458
R501
7
2KHZ R
10K
R519
15K
R520
1K96
C320
22N
22N
R518
30K1
U54B
6
5
BA1458
C321
0.22uF
R524
787R
C322
0.22uF
R522
12K1
U55B
6
5
BA1458
R504
3K92
C311
22N
C312
22N
R502
60K4
U50B
6
5
BA1458
R505
7
500HZ R
10K
R523
6K04
C323
0.22uF
R526
C324
6
5
ALTO LM12
U56B
BA1458
48K7
R508
1K54
C313
0.22uF
C314
0.22uF
R506
24K3
6
5
U51B
BA1458
R509
7
125HZ R
10K
Titel
Size
Date
File
A3
R527
24K3
0.22uF
R528
3K01
MAIN INPUT STAGE
PCB# L12PU2.PCB
1-Oct-2003
OTHER.Sch
C261
22P
R416
U38A
4580M
18K
1
2
3
R418
5K1
C263
6
5
22P
4580M
MAIN L
MAIN MIX
LEFT
VR56A
10KD
R414
5K1
MAIN OUT
(BALANCED)
MAIN MIX
RIGHT
MAIN R
SW37A
PS 22E85L
20K
SW48A
PS 22E85L
SUB1 L
SW38A
PS 22E85L
20K
SW49A
PS 22E85L
SUB2 R
SW39A
PS 22E85L
20K
SW50A
PS 22E85L
SUB3 L
SW40A
PS 22E85L
20K
SW51A
PS 22E85L
SUB4 R
84
84
U44C
4580M
84
84
84
U56C
U78C
4580M
4580M
C363
C361
100N
C362
100N
100N
C364
100N
U64
C365
100N
C367
100N
C368
C366
100N
100N
U65 U66 U67
LEFT BUS
RIGHT BUS
SUB1 L
LEFT BUS
RIGHT BUS
SUB2 R
LEFT BUS
RIGHT BUS
SUB3 L
LEFT BUS
RIGHT BUS
SUB4 R
C369
100N
C370
100N
VR56B
10KD
C371
100N
C372
100N
U68
R415
5K1
C49
100N
C50
100N
U69
C262
22P
R417
18K
2
3
R419
5K1
1
U39A
4580M
VR57B
63HZ R 250HZ R 1KHZ R 4KHZ R
W100K
VR 8B
125HZ R 500HZ R 2KHZ R 8KHZ R
W100K
VR57A
63HZ L 250HZ L 1KHZ L 4KHZ L
W100K
VR 8A
125HZ L 500HZ L 2KHZ L 8KHZ L
W100K
VR59B
W100K
VR60B
W100K
VR59A
W100K
VR60A
W100K
EQ OPL B
C264
6
5
22P
VR61B
W100K
VR62B
W100K
VR61A
W100K
VR62A
W100K
R459
19K1
R463
7K5
R467
30K1
R471
12K1
U38B
R420
22K
R421
22K
U39B
4580M
7
7
VR63B
W100K
VR64B
W100K
VR63A
W100K
VR64A
W100K
R422
5K1
R423
5K1
C265
47u/25V
47u/25V
C267
47u/25V
47u/25V
R460
2K43
R464
976R
R468
3K92
C295
0.22uF
R472
1K54
C266
C268
C290
2N2
C292
22N
C293
22N
C294
22N
C296
0.22uF
VR65B
16KHZ R
W100K
VR65A
16KHZ L
W100K
2
3
C291
22N
2
3
2
3
2
3
R424
10K
R426
10K
R425
10K
R427
10K
C289
2N2
R458
38K3
U48A
BA1458
R462
15K
U49A
BA1458
R466
60K4
U50A
BA1458
R470
24K3
MAIN-L-3
MAIN-L-2
MAIN-R-3
MAIN-R-2
U51A
BA1458
LEFT
RIGHT
EQ VRR A
EQ VRR B
EQ VRR C
EQ VRL A
EQ VRL B
EQ VRL C
1
1
1
1
MAIN L 3
MAIN L 2
MONO LEVEL
MAIN R 3
MAIN R 2
R461
10K
R465
10K
R469
10K
R473
10K
LEFT BUS
RIGHT BUS
EQ OPL A
8KHZ L
2KHZ L
500HZ L
125HZ L
SW41A
PS 22E85L
C283
22P
U47A
BA1458
SW41B
PS 22E85L
C284
22P
U47B
BA1458
R513
7
10K
R517
7
10K
R521
7
10K
R525
7
10K
R529
7
10K
Sheet
Drawn By
R457
10K
R456
10K
12
7
RevisionModel No
BOW.
MAIN INS L
C287
47u/25V
MAIN INS R
C288
47u/25V
16KHZ R
4KHZ R
1KHZ R
250HZ R
63HZ R
VER030710
84 of
D
C
B
A
7654321
8
AUX RETURN 1
VR52A
W50K
VR52B
W50K
VR45A
W50K
R306
56K
VR45B
W50K
R308
56K
VR46A
W50K
R307
56K
R320
56K
C491
47u/25V
C492
47u/25V
C493
47u/25V
C494
47u/25V
C495
47u/25V
C496
47u/25V
VR46B
W50K
R329
3K6
R330
3K6
R335
3K6
R336
3K6
R338
3K6
R339
3K6
C181
22P
R343
U29A
4580M
U29B
4580M
U30A
4580M
U30B
4580M
U31A
4580M
U31B
4580M
22P
22P
C182
22P
C193
22P
C194
C205
22P
C206
1
7
1
7
1
7
36K
C183
47u/25V
R344
36K
C184
47u/25V
R345
36K
C195
47u/25V
R347
36K
C196
47u/25V
R346
36K
C207
47u/25V
R349
36K
C208
47u/25V
R351
20K
LEFT-BUS
R352
20K
RIGHT-BUS
R354
20K
LEFT-BUS
R355
20K
RIGHT-BUS
SW32A
PS-22E85L
MAIN MIX / CTRL/R
SW32B
PS-22E85L
LEFT BUS
RIGHT BUS
LEFT BUS
RIGHT BUS
2
3
6
5
2
3
6
5
2
3
6
5
R367
27K
R368
27K
R299
10K
R369
27K
R370
27K
R309
10K
R371
27K
R374
27K
SW31C
PS-42E85L
8
SW31B
PS-42E85L
5
SW31A
PS-42E85L
2
R353
4K7
TO AUX SEND1
TO AUX SEND2
R357
4K7
R356
20K
LEFT-BUS
R376
10K
R361
20K
RIGHT-BUS
R377
10K
VR48
W50K
VR49
W50K
7
9
4
6
1
3
AFL L
AFL R
SOLO(PFL)
AUX1
AUX2
LEFT BUS
CTRL/L
RIGHT BUS
CTRL/R
(SOLO)
11
SW31D
PS-42E85L
10
12
AUXRTN.SCH
LD9
RED
R375
2K2
LOGIC
D13
BAS316
(LOGIC=2.0V or 0.5V)
LOGIC
D
VCC
C
R293
C177
10K
R733
15K
R300
10K
R737
15K
R738
15K
R294
10K
R736
15K
R310
10K
R734
15K
2
3
6
5
R302
10K
22P
C179
R295
47u/25V
5K1
2
3
6
5
2
3
6
5
R303
5K1
U26A
4580M
C190
22P
R304
5K1
U26B
4580M
U25B
4580M
U27A
4580M
U27B
4580M
1
U25A
4580M
C178
22P
R296
5K1
7
C189
22P
AUX RETURN 2
1
C191
47u/25V
C192
47u/25V
7
C201
22P
R305
5K1
1
C202
22P
R312
5K1
7
R326
5K1
R325
5K1
C180
47u/25V
R332
AUX RETURN 3
C203
47u/25V
C204
47u/25V
5K1
R331
5K1
R314
5K1
R334
5K1
R328
5K1
R327
5K1
R315
5K1
R297
56K
R333
5K1
R316
10K
R298
56K
C175
C173
100P
C174
100P
C185
100P
C186
100P
C197
100P
C198
100P
C187
47u/25V
47u/25V
C176
47u/25V
C188
47u/25V
C199
47u/25V
C200
47u/25V
R301
10K
R735
15K
AUXRTN1-L
AUXRTN1 L
D
AUXRTN1-R
AUXRTN1 R
AUXRTN2-L
AUXRTN2 L
AUXRTN2-R
AUXRTN2 R
C
AUXRTN3-L
AUXRTN3 L
AUXRTN3-R
AUXRTN3 R
R317
10K
B
C213
R740
15K
84
22P
AUX RETURN 4
C215
R313
15K
C235
100N
C236
100N
U28A
4580M
C214
22P
R322
15K
U28B
4580M
47u/25V
1
7
47u/25V
R337
R341
5K1
C216
5K1
R318
5K1
R323
5K1
2
3
6
5
R311
C212
47u/25V
C233
100N
C234
100N
R739
15K
10K
R321
10K
U32C
4580M
C211
47u/25V
AUXRTN4-L
AUXRTN4 L
AUXRTN4 R
C221
100N
84
+VCC
U25C
A
4580M
VCC
C222
100N
1 2 3 4 5 6 78
84
U26C
4580M
C223
100N
C224
100N
84
U27C
4580M
C225
100N
C226
100N
84
U28C
4580M
C227
100N
C228
100N
84
U29C
4580M
C229
100N
C230
100N
84
U30C
4580M
C209
100P
AUXRTN4-R
C210
100P
C231
100N
C232
100N
84
U31C
4580M
R319
100K
VR47A
W50K
C498
47u/25V
VR47B
W50K
100K
R324
C497
47u/25V
R340
3K6
R342
3K6
C217
22P
R348
U32A
4580M
U32B
4580M
22P
C218
1
7
36K
C219
47u/25V
R350
36K
C220
47u/25V
2
3
6
5
R358
20K
R359
20K
R360
20K
R362
20K
R363
20K
R364
20K
R372
30K
R373
30K
PS-22E85L
PS-22E85L
PS-22E85L
PS-22E85L
PS-22E85L
SW34B
PS-22E85L
SW35A
2
SW35B
5
SW33A
2
SW33B
5
SW34A
2
5
1
3
4
6
1
3
4
6
1
3
4
6
LEFT BUS
RIGHT BUS
SUB1
SUB2
SUB3
SUB4
DFX TO MONITOR
AUX1
R365
4K7
R366
4K7
DFX TO MONITOR
AUX2
VR50
W50K
VR51
W50K
AUX1
AUX2
Titel
MAIN INPUT STAGE (AUXRTN)
PCB# S16MN1.PCB
Size
A3
12-Jul-2003
Date
AUXRTN.Sch
File
ALTO L12
Sheet
Drawn By
B
A
RevisionModel No
VER030710
85of
BOW.
7654321
8
(SOLO)
SW27D
U21A
4580M
C149
22P
10
12
D9
BAS316
(LOGIC=2.0V or 0.5V)
R261
36K
C153
1
47u/25V
LOGIC
AUX1 SEND
R269
6K2
LOGIC
VR69
W50K
6
5
U21B
4580M
C157
22P
R262
36K
7
C161
47u/25V
11
PS-42E85L
D
AUX1
2
3
R257
510R
(SOLO)
SW28D
U22A
4580M
C150
22P
10
12
D10
BAS316
(LOGIC=2.0V or 0.5V)
R263
36K
C154
1
47u/25V
LOGIC
AUX2 SEND
R271
6K2
LOGIC
VR70
W50K
6
5
U22B
4580M
C158
22P
R264
36K
7
C162
47u/25V
11
PS-42E85L
C
AUX2
2
3
R258
510R
R282
27K
R283
27K
R281
8K2
AUXSEND1
R270
10K
R285
27K
R286
27K
R284
8K2
AUXSEND2
R272
10K
SW27C
PS-42E85L
8
SW27B
PS-42E85L
5
SW27A
PS-42E85L
2
SW28C
PS-42E85L
8
SW28B
PS-42E85L
5
SW28A
PS-42E85L
2
7
9
4
6
1
3
7
9
4
6
1
3
AFL-L
AFL-R
SOLO(PFL)
AUXSEND1
AFL-L
AFL-R
SOLO(PFL)
AUXSEND2
AUXSEND
D
C
R290
27K
R292
27K
R291
8K2
SW29C
PS-42E85L
8
SW29B
PS-42E85L
5
SW29A
PS-42E85L
2
SW30C
PS-42E85L
8
SW30B
PS-42E85L
5
SW30A
PS-42E85L
2
7
9
4
6
1
3
7
9
4
6
1
3
DFX SEND
AFL-L
AFL-R
SOLO(PFL)
AUXSEND3
AFL-L
AFL-R
SOLO(PFL)
DFX SEND
+VCC
-VCC
84
U21C
4580M
C165
100N
C166
100N
4580M
Titel
Size
Date:
File:
C167
100N
84
U22C
A3
4580M
C168
100N
MAIN INPUT STAGE (AUXSEND)
PCB# L12MN1 PCB
18-Jun-2003
AUXSEND.SCH
84
U23C
ALTO L12
C169
100N
C170
100N
84
U24C
4580M
Sheet
Drawn By:
C171
100N
C172
100N
RevisionModel No:
BOW.
86of
B
A
VER020530
(SOLO)
SW29D
U23A
4580M
C151
22P
10
12
D11
BAS316
(LOGIC=2.0V or 0.5V)
R265
36K
C155
1
47u/25V
LOGIC
AUX3 SEND
R273
6K2
LOGIC
VR71
W50K
6
5
U23B
4580M
C159
22P
R266
36K
7
C163
47u/25V
11
PS-42E85L
B
AUX3
2
3
R259
510R
R287
27K
R289
27K
R288
8K2
AUXSEND3
R274
10K
(SOLO)
SW30D
U24A
4580M
C152
22P
10
12
D12
BAS316
(LOGIC=2.0V or 0.5V)
R267
36K
C156
1
47u/25V
LOGIC
AUX4 SEND
R275
6K2
LOGIC
VR72
W50K
6
5
U24B
4580M
C160
22P
R268
36K
7
C164
47u/25V
R276
10K
11
PS-42E85L
A
1 2 3 4 5 6 78
AUX4
2
3
R260
510R
7654321
C373
22P
R530
SOLO(PFL)
SOLO(PFL)
D
AFL L
AFL-L
AFL R
AFL-R
C
LOGIC
LOGIC
R537
15K
VCC
2
3
6
5
R532
6
5
R536
100K
30K
30K
C374
22P
R531
C375
22P
10K
U57A
4580M
U57B
4580M
U58B
4580M
VCC
R538
220K
R539
15K
R540
10K
R541
10K
C376
47u/25V
1
C377
47u/25V
7
C378
47u/25V
7
PS-42E85L
3
2
SW42A
2
U58A
4580M
C379
100N
R533
20K
R534
20K
R535
20K
SW42B
PS-42E85L
4
6
**SW23:SOLO MODE
SW42C
PS-42E85L
7
9
LD10
1
GR
3
RED
LD11
1
D14
BAS316
11
D15
BAS316
C470
47u/25V
5
C471
47u/25V
8
PFL
SOLO
ACTIVE
R542
5K1
SW42D
PS-42E85L
R741
10K
R742
10K
10
12
R543
5K1
R544
20K
2
3
6
5
C472
22P
R743
10K
C473
22P
R744
10K
U79A
4580M
U79B
4580M
SW FET
C380
2.2u/50V
47u/25V
1
47u/25V
7
C474
C475
SW-FET
PFL IN L
PFL IN R
PFL-IN-L
PFL-IN-R
SW-FET
CTRL/L
MAIN-L-2
SUB1-L
SUB3-L
2TK TO CR-L
SW-FET
SW-FET
CTRL/R
MAIN-R-2
SUB2-R
SUB4-R
2TK TO CR-R
CTRL ROOM SOURCE
SW43A
R546
PS-22E85L
12K
MAIN MIX
SW44A
R547
PS-22E85L
12K
SUB 1-2
SW45A
R548
PS-22E85L
12K
SUB 3-4
SW46A
R549
PS-22E85L
10K
2TK
SW FET
R551
12K
R552
12K
R553
R550
10K
12K
MAIN MIX
SUB 1-2
SUB 3-4
SW FET
SW43B
PS-22E85L
SW44B
PS-22E85L
SW45B
PS-22E85L
SW46B
PS-22E85L
2TK
SW-FET
R545
100K
SW FET
R554
5K1
R555
5K1
TR15
J112
TR17
J112
R556
12K
R557
12K
PFL IN L
R558
62K
TR16
J112
PFL IN R
R559
62K
TR18
J112
TR19
J112
R560
20K
2
3
R561
20K
6
5
C381
22P
C382
22P
4580M
PFL-IN-L
L-METER
U59B
4580M
PFL-IN-R
R-METER
U59A
47u/25V
1
47u/25V
7
C383
C384
R562
100K
R563
47K
R564
100K
R565
47K
R566
5K6
R578
5K6
CONTROL
ROOM
R570
5K6
PHONES
R574
5K6
VR67A
W50K
VR68B
W50K
VR68A
W50K
VR67B
W50K
2
3
C386
22P
6
5
U60B
NJM4580M
2
3
C388
22P
6
5
U61B
NJM4580M
C385
22P
U60A
NJM4580M
47u/25V
C387
22P
U61A
NJM4580M
47u/25V
47u/25V
1
R572
7
C394
47u/25V
1
R580
7
C396
R568
20K
C393
R569
10K
20K
R576
20K
C395
R577
10K
20K
R573
10K
R581
10K
CTR VU-METER
CTRL-R-L
CTRL-R-R
PHONE-L
PHONE-R
8
D
C
C403
100N
47R
84
U57C
4580M
C404
100N
C401
C402
84
U19C
LM393
C484
100N
C485
100N
84
VCC
47u/25V
47u/25V
-VCC
VCC
-VCC
U18C
LM393
C399
R592
100N
312
PGND
C400
R593
100N
47R
U64B
LM339
6
R604
330R
4
U64A
LM339
PGNDPGND
9
11
R591
10K
14
LEFT METER
U64C
LM339
8
R605
470R
10
U64D
LM339
13
( 4) ( 7) ( 10) ( 18)
LD32GRLD33GRLD34
GR
1
U65B
LM339
6
7
R606
510R
4
5
U65A
LM339
2
1
U65C
14
U66B
LM339
LM339
6
7
8
9
R607
R608
620R
1K3
10
11
13
U65D
LM339
GR
5
4
U66A
LM339
2
LD20GRLD21GRLD22
14
U66C
LM339
8
9
10
11
LM339
13
1
7
R6092KR610
5
U66D
LM339
6
2
YEL
U67B
5K6
4
U67A
LM339
YEL
LD35
RED
-VCC
U67C
14
LM339
8
9
VCC
R611
8K2
10
11
U67D
LM339
13
-VCC
LD23
RED
84
U68C
LM339
4580M
LD36
PWR ON
LD37
RED
PHANTOM
312
U67E
GR
R582
2K
R583
4K7
PGND
PH PWR
PGND
312
U66E
LM339
VCC
312
U65E
LM339
312
U64E
LM339
312
U63E
LM339
U62E
LM339
(-30) (-20) (-10) (-7) (-4) (-2) (0) ( 2)
LD24GRLD25GRLD26GRLD27GRLD28GRLD29GRLD30GRLD31
1
U63B
14
U62C
LM339
LM339
6
7
8
9
R601
R602
470R
330R
10
11
13
U62D
LM339
4
5
U63A
LM339
2
1
U63C
14
LM339
7
8
9
R603
470R
10
11
5
U63D
LM339
13
2
R599
56R
1
U62B
LM339
6
7
R600
120R
4
5
U62A
LM339
2
LD12GRLD13GRLD14GRLD15GRLD16GRLD17GRLD18GRLD19
D32
4148
PGND
R588
10K
6
5
U68B
LM458
R589
100K
7
47u/25V
D33
4148
C398
PGND
D16B
PGND
R584
36K
R585
36K
R594
10K
TR13
HR
TR14
HR
2
3
R595
510R
R596
510R
D30
4148
LM4580
R586
100K
U68A
PGND
1
47u/25V
D31
4148
C397
VCC
R597
120R 1/4W
B
L-METER
A
R-METER
1 2 3 4 5 6 78
D16A
DA204K
DA204K
120R 1/4W
R598
U58C
4580M
4580M
84
U20C
C405
100N
C406
100N
C482
100N
84
C483
100N
84
U59C
4580M
LM393
U9C
C407
100N
C408
100N
C481
100N
84
84
U60C
4580M
84
U5C
LM393
Titel
Size
Date
File
C409
100N
C410
100N
C476
100N
PGND
A3
84
U61C
4580M
C477
RVCC
100N
84
U4C
4580M
C478
-RVCC
100N
CONTROL ROOM STAGE
12-Jul-2003
CTRMETER.Sch
C411
100N
C412
100N
C486
47u/25V
C487
47u/25V
ALTO L-12
84
U79C
4580M
R745
47R
R746
47R
C51
100N
C52
100N
VCC
-VCC
Sheet
Drawn By
C479
47u/25V
C480
47u/25V
B
A
RevisionModel No
VER030710
87of
BOW.
7654321
8
L12DSP
C415
C413
22P
D
+5VD
10K CHANGE TO 3K3
C433
22P
R626
+VCC
1
1
6
5
LD38
RED
R648
4K7
1
3K3
U72A
4580M
R627
3K3
U73A
4580M
U75A
LM393
C434
22P
C432
22P
R635
2K2
U74B
4580M
2
3
2
3
C440
1.5nF 2.5%
7
C431
100N
3
2
C436
R624
4.7uF
RL1B
RY-5W-K
(MUTE)
C438
4.7uF
RL1C
RY-5W-K
(MUTE)
C439
4.7uF
68R
R625
68R
R634
10K
EFXRTN-L
C
EFXRTN-R
DFX SEND
B
EFXRTN-L
EFXRTN-R
DFX SEND
3
5
7
4
6
8
MUTE(GLOW)
PEAK(FLICKER)
R628
10K
R629
10K
R654
1K
1.5nF 2.5%
7
1.5nF 2.5%
7
R636
10K
R637
10K
R652
1M
7
C441
R655
10K
U72B
4580M
C442
R656
10K
U73B
4580M
R653
2M2
U75B
LM393
R630
10K
+5VD
GND
CN6
HEADER 8X2
12
34
56
78
910
1112
1314
1516
U77B
3 4
74HC14
RL1A
RY-5W-K
TR20
BR
R632
C435
22P
R638
10K
U74A
4580M
R651
7K5
5
6
R650
220R
C422
33P
C445
33P
1
10K
R633
10K
R649
820K
D22A
RB400D
D24
DA202K
6
5
R631
10K
6
5
2
3
1 2
3 4
AR1
680R*4
5 6
7 8
5 6
+5VD
12
EN1
SDB161PVB15FS
1
1
2
2
3
4
4
8
U77C
74HC14
100N
100N
D21
4148
R644
10K
DGNDDGND
AR2
680R*4
EN2
5 6
TG
TH
TR21
BR
7 8
DGND
SDB161PVB15FS
1
1
2
2
3
4
4
8
PRESETVARIATION
+5VD
R639
47K
4
2
6
C444
10uF
DGND
R641
10K
R643
10K
R642
10K
6
7
1 2
3 4
COM
DGND DGND
U71A
NE555
OUT3RS
CTR5DS
7
C421
DGND
DGND
C437
COM
U76A
74HC109
Q
Q
S5R
CLK
1
EFXRTN-L
EFXRTN-R
R640
+5VD
10K
2
J
4
3
K
DGND
DGND
R612
36K
R613
36K
D20
BAS316
C423
1uF
2
3
R622
510R
2
3
R623
510R
U69A
4580M
U70A
4580M
U77A
74HC14
C414
22P
R614
36K
1
R615
36K
1
R645
10K
C417
47u/25V
C418
47u/25V
+5VD
12
C424
1uF
DGND
R616
6K2
EFFECTS OUT
R617
6K2
U76B
74HC109
10
Q
9
D23
BAS316
R647
220R
R646
220R
CLK
Q
S11R
15
DGND
14
J
12
13
K
FOOTSW
SW47
PS-22E85NL
(MUTE)
VR73B
W50K
VR73A
W50K
DGND
6
5
6
5
22P
U69B
4580M
C416
22P
U70B
4580M
U77D
74HC14
8 9
U77F
74HC14
12 13
R620
36K
7
C419
47u/25V
R621
36K
7
C420
47u/25V
D
DFXOUT-L
DFXOUT-R
C
DGND
B
U76C
168
DGND
C429
100N
147
U77G
74HC14
74HC109
81
C446
100N
+VCC
A
-VCC
84
U69C
4580M
C447
100N
1 2 3 4 5 6 78
84
U70C
4580M
C448
100N
C449
100N
84
U72C
4580M
C425
100N
C426
100N
84
U73C
4580M
C427
100N
C428
100N
84
U74C
4580M
C450
100N
C451
100N
84
U75C
LM393
C452
100N
C453
100N
U71B
NE555
C430
100N
+5VD
C443
10uF
JP1
PGND
UDASP IN/OUT SECTION
Titel
Size
A3
Date:
File:
UDASP IN/OUT SECTION
ALTO L-12
18-Jun-2003
L12DSP.Sch
Sheet
Drawn By:
RevisionModel No:
BOW.
88of
A
VER030424
321
4
D7
1N4002
D
D10
1N4002
TR4
7805
+5VD
C10
1000uF/16V
D
C13
PGND
D8
1N4002
D9
1N4002
1000uF/25V
PGND
PGND
TR1
D1
1N4002
PGND
+15V
317
AC INPUT
C
210-240V~
AC FUSE T400mAL
L
N
GND
AC SW
115 V
0 V
115 V
16 2V
0V
16 2V
7 5
0V
12V
0V0 V
CN1
1
2
3
4
5
6
7
CON7
PGND
BD1
BRIDGE1
PGND
C1
3300uF/35V
3300uF/35V
C2
3300uF/35V
3300uF/35V
C11
C12
R6
2K7R82K7
C15
10uF/25V
R7
2K7R92K7
C16
10uF/25V
R10
120R
R11
120R
C3
100uF/25V
PGND
C4
100uF/25V
1
2
CN5
2P-2.5
C
R5
1K5
CN3
2.5-8P
PT-L16
TRANSFORMER
D3
1N4002
B
D4
1N4002
D5
1N4002
CN2
2P-2.5
TR2
337
PHANTOM
1
2
D2
1N4002
C7
220uF/100V
-15V
TR3
TIP122
+5VD
+15V
-15V
+48V
PGND
R3
10R
1
2
3
4
5
6
7
8
POWER
PHANTOM
+48V
B
C6
100uF/100V
R1
390K
R2
10K
C9
R4
20K
47uF/100V
ZD1
C5
100uF/100V
D6
1N4002
C8
47uF/100V
1N5261
(47V 0.5W)
PGND
2P-2.5
A
1 2 34
FUSE
CN4
1
2
Titel
Size
A4
Date:
File:
POWER SUPPLY BOARD
L-12
1-Oct-2003
L12PWR-NEW.Sch
Sheet
Drawn By:
A
RevisionModel No:
VER030521
11 of
Xian
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