Alto X23SW Schematic
Service Manual
Model: X23SW (2-WAY STEREO PLUS SUBWOOFER)
ACTIVE CROSSOVER
www.altoproaudio.com
Version: 1.1
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
Electrical
1. SPECIFICATION (X23SW)
Subwoofer Frequency Range
Low - High Frequency Range
THD
S/N Ratio
Controls
Input Level
Output Level
Low Cut
Phase
Power Supply
Connector type
Type
Mains supply
50Hz ~ 250Hz
250Hz ~ 6KHz
<0.05%
>95dB
Continuouliy variable
Sub, Low. High continuously variable
Front panel switches
Front panel switches
3-pole IEC , grounded
Servo controlled, stabilized
95-120V /210-240V ,60-50Hz
Power Rating
Physical
Dimensions
Weight
6W
483(W) 194.5(D) 44(H)mm (19" 7.7" 1.7")
2.95 Kg(6.50lb)
D
2.Block Diagram
4321
C
B
A
+15V
20V
PT-SCX-34
102℃
230V
5 6
0v
-15v
BRIDGE
AND FILTER CIRCUIT
0V
20V
0V
115V
AC POWER SW
SUB - LOW
1
A
3
2
over freq.
pass filter
SUB-LOW
900Hz - +9KHz
TL074
100Hz +1KHz
pass filter
LOW-HIGH pass
gain
VR
LOW OUT
1
A
3
2
lower filter pass
1
A
high pass freq.
3
2
TL074
high out
TL074
VR
VR
gain
gain
SUB - LOW
1
A
3
2
over freq.
pass filter
SUB-LOW
100Hz +1KHz
900Hz - +9KHz
TL074
pass filter
LOW-HIGH pass
gain
VR
LOW OUT
1
A
3
2
lower filter pass
1
A
high pass freq.
3
2
TL074
high out
TL074
VR
VR
Title
gain
gain
Number RevisionSize
A4
Date: 2-Nov-2002 Sheet of
File: D:\pc42\pc42\ALTO\ \X23SW\X23SW BLOCK DIGRAME .DDB服務手冊 Drawn By:
100mA
FUSE
AC PLUG
50Hz
AC INPUT 210V-240V
D
1
A
3
213
TL074
2
CN-BAL-FEMALE-2
A -CHANNEL SIGNAL
1
VR
gain
A
3
2
213
CN-BAL-FEMALE-2
TL074
VR
gain
B-CHANNEL SIGNAL
1 2 3 4
C
B
A
D
3. Schematic Diagram
C
B
A
X4
LOW OUT
3c5e1a
4d
2b
220R
R18
4
SW1
30HZ CUT
R17
R16
100K
C9
10uF
13
R14
321
R13
22K
C7
R12
10K
C19
47P
100K
C8
10uF
14
U1D
TL074
12
R15
100K
C20
683(M)
47K
683(M)
8
U1C
TL074
9
10
C6
330P
R11
6K8
X5
HI OUT
3c5e1a
R30
10K
R26
11of
4d
2b
220R
R32
R31
100K
C12
10uF
TASY J.S.
Revisio nModel No:
Drawn By:
Sheet
X23SW V1.0
14
27-Jan-2002
X23(M).Sch
U2D
TL074
10K
10K
47P
R29
INV
SW2
8
U2C
TL074
9
10
C10
330P
6K8
R24
12
13
R27
10K
R28
22K
C11
R25
10K
Titel
ALTO Mobile : X23SW MAIN BOARD
A4
Size
File:
Date:
VR2
100KB
7
U1B
TL074
5
6
C3
103(M)
R5
R4
R1
100K
100K
R8
620K
VR1B
100KB
R6
620K
VR1A
100KB
3K74
1
U1A
TL074
R2
100K
3
2
C1
10uF
C2
10uF
213
X1
5e
C4
R7
103(M)
3K74
1a4d2b
R9
C5
103(M)
3c
10K
R22
10K
R21
10K
R20
10K
2
R19
10K
R3
100K
X2
INPUT
CH1(CH2)
VR3
7
100KB
U2B
TL074
5
6
123
CN3
3P2.5
1
U2A
TL074
3
+15V
411
411
-15V
TL074
U1E
TL074
U2E
1 2 34
D
C
B
A
D
C
B
A
X5
SUB WOOFER OUT
3c5e1a
4d
2b
4
C30
10uF
220R
R80
3
2
1
R78
100K
14
6
5
4
SW4
SW-6-SK22H13
R79
100K
C31
10uF
ALTO Mobile : X23SW SUB WOOFER BOARD
Titel
U9D
TL074
R75
683M)
683M)
100K
123
J102
3P2.5
123
J101
3P2.5
AGND
12
13
321
R74
47K
C29
C28
8
11of
TASY J.S.
Revisio nModel No:
Drawn By:
Sheet
X23SW V1.0
27-Jan-2002
X23(SUB).Sch
A4
Size
File:
Date:
R73
22K
47P
C27
9
C26
330P
R72
10K
C23
473(M)
R69
330K
R67
R66
19K1
1
U9A
TL074
R71
330K
U9C
TL074
10
6K8
VR7
100KB
7
U9B
TL074
5
6
VR6B
100KB
VR6A
100KB
C25
473(M)
C24
473(M)
R68
19K1
+15V
411
-15V
TL074
U9E
3
2
R64
10K0
R63
10K0
D
C
CH1 CH2
B
A
1 2 34
D
4
C
B
A
R1
1.2K
CN5
2P2.5
1
2
SCX POWER Schematic
Number RevisionSize
A4
Title
Date: 27-Jan-2002 Sheet of
File: D:\pc42\pc42\pc42\S-OVER\SCX202S\SCX202S\SCX202S.ddbDrawn By:
CN3
C7
123
C9
1000/16V
3P2.5
104P
IC2
C4
C19
-15V
L7915
104P
1000/35V
CN2
3P2.5
-15V
123
C8
104P
+15V
+15V
321
C6
IC1
L7815
C5
C18
1000/16V
104P
1000/35V
DB1
RB154
123
CN?
D
C
CON3
1 2 34
B
A
4.Printed Circuit Diagram
X23SW(M) PCB LAYOUT
PCB : X23SW(M) Top Overlay
PCB : X23SW(M) Bottom Layer
PCB : X23SW(M) Bottom Solder Mask
PCB : X23SW(M) Bottom Overlay
PCB : X23SW(M) Drill Drawing Plots
Hole Size Hole Count
31mil (0.8mm) 128
39mil (1.0mm) 21
47mil (1.2mm) 17
63mil (1.6mm) 1
87mil (2.2mm) 6
138mil (3.5mm) 4
Totals 177
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