Alto X34 Schematic
Service Manual
Model: X34 (3-WAY STEREO 4-WAY MONO)
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 (X34)
LOW-MID Frequency Range
MID-HIGH Frequency Range
HUM & Noise
LOW Section (Output@0dB)
MID S (O @0dB)ection utput
HIGH Section(Output @0dB)
S/N Ratio
Controls
Input Level
Output Level
CD Boost
Mute
Phase
Power Supply
Connector type
Type
Mains supply
Power Rating
90Hz-1KHz
800Hz-10KHz
Av=0db, fc=230Hz,2.3KHz
98dBu
-95dBu-95dBu
93dBu
114dB
continuously variable
low, high variablecontinuously
rear panel switch
low, mid, high front panel switches
rear panel switch
3-pole IEC , grounded
Servo controlled , stabilized
95-120V /210-240V ,60-50Hz
10W
Physical
Dimensions
Weight
483(W) 194.5(D) 44(H)mm (19" 7.7" 1.7")
2.5Kg(5.51lb)
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
LOW OUT
pass filter
over freq.
Low-MID
pass filter
over freq.
Low-MID
100Hz -1KHz
pass filter
over freq.
MID - High
800Hz - +12KHz
1
MID OUT
1
A
TL074
3
2
lower filter pass
high out
1
A
3
2
TL074
VR
VR
gain
gain
LOW OUT
pass filter
over freq.
Low-MID
pass filter
over freq.
Low-MID
100Hz -1KHz
pass filter
over freq.
MID - High
800Hz - +12KHz
1
MID OUT
1
A
lower filter pass
A
TL074
3
2
high out
1
3
2
TL074
VR
Title
VR
Number RevisionSize
A4
Date: 29-Oct-2002 Sheet of
File: D:\pc42\pc42\ALTO\ \X34\X34.ddb服務手冊 Drawn By:
gain
gain
100mA
FUSE
D
AC PLUG
50Hz
AC INPUT 210V-240V
A
A -CHANNEL SIGNAL
3
213
TL074
2
CN-BAL-FEMALE-2
gain high pass freq.
VR
C
A
B-CHANNEL SIGNAL
3
213
B
TL074
2
CN-BAL-FEMALE-2
gain high pass freq.
VR
1 2 3 4
A
87654321
3. Schematic Diagram
R42
2
3
2K49
R40
10K0
IC2A
MC33079
R44
10K0
XOVER FREQ 800Hz + 12KHz
IC2B
MC33079
C64
182(M)
7
R64
10K0
1
VR4D
B50K
R63
10K0
R43
3K57
6
5
R45
3K57
VR4C
R59
10K0
B50K
R60
10K0
C61
9
182(M)
10
IC2C
MC33079
R58
10K0
VR4B
B50K
13
12
8
IC2D
C60
182(M)
14
MC33079
R57
10K0
R55
10K0
VR4A
B50K
R56
10K0
C57
9
10
182(M)
8
D
IC1C
MC33079
SW1
C5
822(M)
SW-PBA/2PC
CD BOOST
R84
10K0
R85
10K0
6
5
R86
10K0
IC1B
MC33079
SW7
SW-PBA/6PC
CN4
2P2.5
<4-WAY MONO2>
7
2
1
+15V
D4
-15V
4148
D2
4148
R82
10K0
S1
CN-BAL(FEMALE)
C1
104P/250VAC
1
3
2
D
R80
10K0
R81
10K0
D3
4148
4148
D1
C2
220P
2
3
IC1A
MC33079
C4
220P
R83
10K0
VR1
10KB
R89
2K67
1
C42
100/25V
R1
R65
825R
20K0
CH1使用
R41
15K0
R87
10K0
CH2使用
R36 2K49
2
3
IC5B
MC33079
R11
100K
R12
100K
R34 10K0
IC3A
MC33079
R28
7K5
R54
10K0
7
100K
1
R27
R69
1K5
D7
LED
HIGH CLIP
-15V
SW6
SW-PBA/2P
MID PHASE
1
3
2
CN-BAL(MALE)
HIGH OUT 1
HIGH
R61
10K0
R35
3K57
S4
VR5D
B50K
R62
10K0
6
5
IC3B
MC33079
4K99
VR7
10KB
R101
10K0
R100
10K0
R74
10K0
R102
10K0
R103
10K0
R25
C53
153(M)
9
10
13
12
8
VR5B
B50K
R48
10K0
R21
7K5
IC6B
MC33079
R49
10K0
7
13
12
R22
100K
MID CLIP
D6
LED
R68
1K5
IC3D
MC33079
LD2LD3
C50
153(M)
R51
10K0
SW4
SW-PBA/2P
IC6A
MC33079
9
10
1
7
VR5C
B50K
R50
10K0
R33
3K57
2
3
R24
27K4
R71
2K7
IC3C
MC33079
+15V
6
5
C52
153(M)
R23
27K
R20
4K7
-15V
C20
100/25V
R7
100K
C28
220P
R99
10K0
R6
150R
C17
182(M)
8
IC6C
MC33079
R77
C25
220P
IC6D
MC33079
R96
10K0
R9
150R
14
C24
182(M)
C22
100/25V
R8
100K
SW5
SW-PBA/2P
MID PHASE
1
3
2
CN-BAL(MALE)
MID OUT 1
NOT USED
S3
R37
15K0
13
12
C
R39
10K0
2
1
SW2
SW-PBA/2P
2
R30
4K99
3
IC5A
VR6
10KB
R31
27K4
MC33079
14
IC1D
MC33079
<4-WAY MONO>
CN3
2P2.5
R29
4K7
R72
1
2K7
R38
10K0
+15V
6
5
R26
27K
B
C30
100/25V
R108
10K0
R109
10K0
R10
150R
C36
220P
R107
9
10
10K0
IC5C
C27
182(M)
8
MC33079
R75
10K0
R110
10K0
A
R111
10K0
R78
C35
220P
R104
10K0
C34
C32
100/25V
13
12
IC5D
R13
150R
14
MC33079
182(M)
XOVER FREQ 100Hz + 1KHz
R47
10K0
14
VR5A
B50K
R46
10K0
R19
4K99
VR2
10KB
R93
10K0
R92
10K0
R73
10K0
R94
10K0
R95
10K0
+15V
R201
-15V
2R2 1/2W
AGND
R202
2R2 1/2W
C38
1000/25V
C37
1000/25V
CN1
3P2.5
1
2
3
C
C48
IC4A
2068M
153(M)
R32
10K0
1
5
6
2
3
IC4B
2068M
7
C9
104P
C16
104P
84
IC4C
2068M
C43
100/25V
MC33079
C44
100/25V
411
IC5E
C39
100/25V
MC33079
C40
100/25V
IC6E
C41
411
100/25V
MC33079
C45
100/25V
411
IC7E
+15V
R15
SW3
SW-PBA/2P
2
3
IC7A
MC33079
R18
27K4
C8
220P
R91
9
10
10K0
8
IC7C
4K7
6
R70
1
2K7
5
R17
27K
R2
150R
C7
182(M)
MC33079
R76
C15
220P
R88
13
12
10K0
IC7D
MC33079
R5
150R
14
182(M)
100/25V
C14
C10
100/25V
C12
R14
7K5
IC7B
MC33079
D9
LED
LOW CLIP
R3
100K
R4
100K
7
-15V
R16
100K
R67
1K5
1
3
2
LD1
S2
CN-BAL(MALE)
LOW OUT 1
NOT USED
C3
411
104P
IC3E
MC33079
C6
104P
Titel
ALTO Mobile : X34 MAIN BOARD
Size
A3
Date:
File:
4-Mar-2002
X34(M).Sch
X34
C56
104P
MC33079
C58
104P
CHS1CHS2
411
IC2E
Sheet
Drawn By:
C59
104P
MC33079
C62
104P
411
IC1E
RevisionModel No:
11 of
TASY J.S.
B
A
V1.0
1 2 3 4 5 6 7 8
D
4
C
B
A
R1
1.2K
CN5
2P2.5
1
2
SCX POWER Schematic
Number RevisionSize
Title
A4
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
1000/16V
C5
104P
C18
1000/35V
DB1
RB154
123
CN?
D
C
CON3
1 2 34
B
A
4.Printed Circuit Diagram
X34(M) PCB LAYOUT
PCB : X34(M) Top Layer
PCB : X34(M) Top Solder Mask
PCB : X34(M) Top Overlay
PCB : X34(M) Bottom Layer
PCB : X34(M) Bottom Solder Mask
Totals 285
PCB : X34(M) Bottom Overlay
PCB : X34(M) Drill Drawing Plots
Hole Size Hole Count
24mil (0.6mm) 122
31mil (0.8mm) 64
39mil (1.0mm) 37
47mil (1.2mm) 48
59mil (1.5mm) 2
87mil (2.2mm) 8
150mil (3.8mm) 4
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