Alto Monittor Service Manual
Service Manual
Model: ALTO MONITTOR
PA/MONITOR PROCESSOR
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
Specifications
Frequency Response:10Hz – 30KHz, ±0.5dB.
THD + Noise Ratio:106dB,1KHz
Input Impedance: 50k ohm balanced,25k ohm unbalanced
Maximum Input Level:+19dBm
Output Impedance: 60 ohm balanced,30 ohm unbalanced
Maximum Output Level:+21dBm
Graphic EQ Band Separation:2/3 Octave.
Power Supply:
Power consumption 8W
Fuse 95~120V ,T315mA
210~240V, T200mA
Dimensions
483(W)*194.5(D)*44(H) mm(19*7.7*1.7)
Weight
2.8kg
D
C
B
A
OUTPUTEQ
4
3c5e1a
4d
2b
OUTPUT
213
4
1
3
BYPASSBYPASS
LOW-CUT
321
2
1
3 2
1
3
1
3 2
2
MASTER VOL.
D
Bypass
213
4
INPUT
RANGE +-6/12dB NOTCH1/2
C
3c5e1a4d2b
INPUT
1
BYPASS BYPASS BYPASSBYPASS
3
2
HI-PASS LOW-PASS EQ
1
3
2
1 2 34
B
A
D
1
2
3
+-6/12 DB
SW4A
LED8
GRN
R174
10K
-15V 15V
5
6
P
+-6/12DB
SW4B
7
8
9
P
SW4C
+-6/12DB
1
2
15V
3
SW3A
LED3
GRN
R20
10K
-15V
1
2
15V
3
SW2A
LED2
GRN
R17
10K
-15V -15V
R5
10K
LED1
GRN
SW1A
EQ
3
2
15V
1
27P
C18
R33
475R
C16
R26
R23
P
6
5
LOPASS
SW3B
LOPASS
P
6
5
SW2B
HIPASS
HIPASS
SW1B
R15
20K
27P
C7
R12
10K
P
6
5
EQ
C6
27P
SJMP1
C4
27P
R8
20K
single
7
R35
2K2
IC3B
4580
R34
2K2
5
6
R91
2K2
SING2
R29
475R
R30
2K2
R27
2K2
1
27P
2K2
3
2
475R
R24
2K2
R22
475R
EQ2
R21
2K2
R181
10K
7
C31
10u/16V
IC2B
4580
C15
5
6
C13
470P
R19
20K
R18
20K
R180
10K
R179
10K
C42
10u/16V
1
3
2
C10
100N
C11
C8
C9
100N
1
R14
10K
IC4A
3
2
R9
3K01
13
VR1A
R176
10K
C137
10u/16V
1
IC1A
R11
4580
10K
3
2
R10
10K
7
IC1B
4580
5
6
R7
20K
C3
27P
R3
R4
10K
10K
C2
27P
C1
27P
R2
R1
10K
10K
INPUT
INPUT-
R36
IC3A
4580
470P
IC2A
R16
100N
100N
4580
R54
2K
W 100K
EQ VR UP
2K2
EQ
SING1
R25
2K2
EQ VR DOWN
-15V
R55
10K
LED5
GRN
3
2
15V
1
SW6A
4580
20K
R96
10K
LED11
GR
P
9
8
15V -15V
7
SW9C
NOTCH2 X10/X1
R49
1K
1
2
3
X10/X1
SW9A
1N
C41
6N8
C14
10
11
12
P
X10 X1
SW9D
C5
1N
C39
6N8
5
6
P
SW8B
X10/X1
33N
C35
C22
5N6
SW8D
X10/X1
10
11
12
P
C17
C33
33N
5N6
C
OUTPUT
C152
470P
4K53
R66
R67
R65
3K24
60R4
7
IC8B
4580
C30
10P
C29
R61
R56
10K
1
IC7A
4580
R53
10K
3
2
R50
10K
R47
10K
LED4
GRN
3
2
15V -15V
1
SW5B
SW5A
WAVE INVERT
LED10
C28
100P
C24
100P
R89
5K11
R92
5K11
C27
680P
C25
680P
VR21A
R72
5K11
R79
5K11
LOWCUT
-15V15V
R82
10K
GR
P
9
8
7
SW8C
NOTCH1 X10/X1
1
IC11A
4580
3
2
C40
680P
R86
10K
VR22B
C 100K
7
IC12B
4580
5
6
C38
680P
R90
10K
VR22A
C 100K
1
4580
IC12A
R88
3
2
R85
5K11
1
IC10A
4580
3
2
C34
3N3
R77
10K
C146
VR21B
C 100K
10u/16V
7
IC5B
4580
5
6
C32
3N3
R76
10K
C 100K
1
IC5A
4580
R75
3
2
R71
R73
5K11
1
IC9A
4580
3
2
R94
10K
R37
10K
R93
4K99
SJMP1
single
18P
5K76
5
6
R57
3K16
5
6
P
SW6B
WAVE INVERT
27P
C26
27P
C12
R52
10K
R48
5
6
P
LOWCUT
R45
4K42
VR18A
C 100K
27P
C20
R97
R95
5K11
2
C156
10u/16V
3
VR20A
A 100K
5K11
R87
511
C19
27P
R74
4K42
R81
5K11
2
3
VR19A
A 100K
5K11
511
OUTPUT-
12356789101112
C151
470P
R63
R62
4K53
60R4
1
IC8A
4580
R60
6K04
3
2
R58
10K
R59
2K67
7
R51
20K
IC7B
4580
5
6
10K
R43
4K99
2
3
VR17A
A 100K
7
IC6B
4580
VR18B
C 100K
6
5
6
5
C23
100N
C21
100N
1
C6A
4580
R178
10K
3
2
5
6
C37
10u/16V
R177
10K
7
R41
5K11
C11B
SW10B
4580
5
6
5K11
5K11
R40
1
SW7B
NOTCH1 N/OFF
5
6
P
10K
R175
C36
10u/16V
7
R39
IC10B
5K11
4580
5
R38
5K11
1
J1
OUTPUT
OUTPUT-
R64
3K16
INVERT
R161
8K06
15V
-15V
LED19
RED(+18)
MASTER VOL
R46
4K42
LOW CUT FILTER
P
NOTCH2 N/OFF
J2
CON2
R28
1K
15V
R84
10K
LED7
GR
3
2
1
R70
10K
LED6
GR
3
2
15V -15V -15V15V
1
B
15V
C99
47N
8
CON12
15V
-15V
INPUT
INPUT-
R172
30K1
5
6
D2
1N4148
R171
49K9
D3
1N4148
D1
R163
3K24
R162
6K34
6
7
5
1
IC22A
LM339
2
LED18
YEL(+12)
R164
1K58
10
11
8
9
13
IC22C
LM339
1
IC22B
LM339
LED13
LED17
GR(+6)
GR(0)
IC9B
4580
1N4148
R170
1K
1u
C89
R165
806R
R166
402R
R167
200R
6
7
5
IC22D
LM339
1
IC21B
LM339
IC21A
LM339
2
LED14
GR(-12)
GR(-6)
LED12
R6
15V
R13
1
3
2
VR6A
W 100K
C57
10/16V
160Hz
3K9
R120
1
4580
R119
30K1
R117
1
2
R194
1K15
C52
20K
R113
R184
44K2
C49
R109
33K2
10K
R100
C46
51K1
R105
SW10A
NOTCH2 ON/OFF
R183
44K2
C44
R101
SING2
SW7A
NOTCH1 ON OFF
R99
20K
27P
C43
IC15A
3
2
C55
C56
100N
100N
R118
4K22
13K3
1
3
2
VR5A
W 100K
C54
10/16V
3K9
R116
100Hz
7
4580
IC14B
R115
44K2
5
C53
100N
100N
1K
R42
R114
6K81
1
3
2
VR4A
W 100K
C51
10/16V
63Hz
3K9
R112
4580
IC14A
R111
30K9
3
2
C50
100N
100N
511
10K
R110
R192
1
3
2
VR3A
W 100K
C48
10/16V
3K9
40Hz25Hz
R108
7
C13B
4580
R107
105K
5
6
C47
100N
100N
R106
16K5
R187
402R
1
3
2
VR2A
W 100K
C153
10/16V
3K9
R104
4580
IC13A
R103
130K
3
2
C45
100N
100N
28K
R102
82K5
7
C4B
4580
5
6
R98
20K
SING1
1
R139
90K9
C70
3N3
R137
39K2
1
1K
R44
R135
C67
33N
R133
6K34
R186
1
10K
R173
R131
C64
33N
10K
R185
R129
1
511
R190
R127
C61
33N
R126
R125
16K5
1
R123
57K6
33N
C58
R121
26K1
C97
47N
8
C95
47N
312
C93
47N
312
R168
100R
10
11
8
9
13
IC21C
LM339
1
LED15
GR(-18)
LED16
GR(-24)
HR
TR1
475R
2M00
R31
1M00
3
2
VR15A
W 100K
C72
10/16V
1.6KHz
3K9
R140
7
IC17B
4580
5
6
C71
3N3
R80
R138
13K3
3K01
3
2
VR13A
W 100K
C69
10/16V
3K9
R136
13K3
301
C66
R132
12K1
200R
C63
R128
36K
3K16
C60
R124
R122
1KHz
1
4580
IC17A
3
2
C68
33N
1K
R32
R134
1K15
3
2
VR11A
W 100K
10/16V
630Hz
3K9
IC16B
4580
5
6
C65
33N
R130
3K24
3
2
VR9A
W 100K
10/16V
3K9
400Hz
1
4580
IC16A
3
2
C62
33N
R69
2K2
3
2
VR7A
W 100K
10/16V
3K9
250Hz
4580
IC15B
5
6
33N
C59
R83
4K02
4K22
A
-15V
47N
15V
C100
4580
IC19C
C98
47N
4580
IC20C
C96
47N
IC21E
LM339
C94
47N
IC22E
LM339
R169
110R
IC21D
LM339
OUT LEVEL
1
R159
R182
18K2
C85
C86
3N3
R157
4K42
1
R155
15K4
C82
3N3
R153
6K81
1
R193
3K24
R151
C79
3N3
10K
R149
1
511
R189
R147
C76
3N3
R145
16K5
1
R143
C73
3N3
R141
26K1
-15V
47N
C117
47N
C118
8
4580
IC10C
47N
C116
47N
C115
8
4580
IC11C
47N
47N
C114
C113
8
4580
IC12C
47N
47N
C112
C111
15V
8
4580
IC13C
47N
47N
C109
C110
8
C14C
4580
47N
47N
C108
C107
8
4580
IC15C
47N
47N
C105
C106
8
4580
IC16C
47N
C104
47N
C103
8
4580
IC17C
47N
47N
C102
C101
8
4580
IC18C
3
2
VR16A
W 100K
C87
10/16V
3K9
R160
18K2
2
3N3
C84
10/16V
3K9
R156
6
C81
10/16V
3K9
R152
20K
2
R191
C78
10/16V
R148
36K
6
R146
C75
10/16V
3K9
R144
57K6
2
R142
16KHz
1
4580
IC20A
3
R78
2K67
R158
2K67
3
2
VR14A
W 100K
7
4580
IC19B
5
C83
3N3
2K
R154
3
2
VR12A
W 100K
6.3KHz
4580
IC19A
3
C80
3N3
511
R150
3K24
3
2
VR10A
W 100K
3K9
4580
IC18B
5
C77
3N3
R68
2K2
3K16
3
2
VR8A
W 100K
2.5KHz
4580
IC18A
3
C74
3N3
R188
402R
8K06
VER030 2
11 of
D.H.YEN
Re is onModel No
D awn By
Sheet
MONITOR
2 -A pr-2003
MONITORFP.SCH
MONITOR-FP
A3
Size
File
Date
Titel
-15V
47N
C136
47N
C135
8
IC1C
4580
47N
C134
47N
C133
8
IC2C
4580
47N
47N
C132
C131
8
IC3C
4580
47N
47N
C130
C129
8
IC4C
4580
47N
47N
C128
C127
8
C5C
4580
47N
C126
47N
C125
8
IC6C
4580
47N
47N
C123
C124
8
4580
IC7C
47N
47N
C122
C121
8
4580
IC8C
47N
C120
47N
C119
8
IC9C
4580
EQ LEVEL
10KHz
4KHz
EQ2
D
C
B
A
D
C
B
A
VER030424
11 of
D H YEN
RevisionModel No:
4
Drawn By:
Sheet
MONITOR
CN2
PJ2
3c5e1a
4d
321
3c5e1a4d2b
PHONEJACK5 (5-PIN)
OUTPUT
2b
CN-BAL-MALE
OUTPUT
24-Apr-2003
213
4
1234567891011
J1
12
CON12
MONITOR-PU
Titel
-15V
+15V
213
4
MONITORPU SCH
A3
Size
File:
Date:
PJ1
PHONEJACK5 (5-PIN)
INPUT
CN1
INPUT
CN-BAL-FEMALE
C7
1000u/25VC81000u/25V
-15V
TR2
7915
TR1
+15V
7815
C3
104PC4104P
C5
1000u/35VC61000u/35V
C1
104PC2104P
BD1
BRIDGE1
1 2 34
123
CN3
CON3
D
C
B
A
PCB：MONITOR-FP Top Layer
PCB：MONITOR-FP Top Solder Mask
PCB：MONITOR-FP Bottom Layer
PCB：MONITOR-FP Bottom Solder Mask
PCB：MONITOR-FP Top Overlay
PCB：MONITOR-FP Drill Drawing Plots
PCB：MONITOR-FP Bottom Overlay
Tool Hole Size Hole Count Plated Tool Travel
--------------------------------------------------------------------------T1 24mil (06096mm) 178 7842 Inch (1991 75 mm)
T2 31mil (07874mm) 130 5274 Inch (1339 66 mm)
T3 35mil (0889mm) 12 2258 Inch (573 47 mm)
T4 39mil (09906mm) 32 3308 Inch (840 33 mm)
T5 43mil (10922mm) 48 3567 Inch (906 13 mm)
T6 87mil (22098mm) 12 3283 Inch (833 95 mm)
T7 126mil (32004mm) 5 NPTH 3261 Inch (828 26 mm)
--------------------------------------------------------------------------Totals 417 28793 Inch (7313 55 mm)
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