![Alto APM 120 Service Manual Download Page 12](http://html.mh-extra.com/html/alto/apm-120/apm-120_service-manual_2911624012.webp)
1
2
3
5
6
7
8
9
10
11
12
A
B
C
D
12
11
10
9
8
7
6
5
3
2
1
D
C
B
A
APM STEREO BOARD(
3/
3)
9 BAND EQ
C1
3
5
47uF
/25V
C1
3
6
47uF
/25V
R
449
4K70
R4
4
6
150K
R4
4
8
4K70
3
2
1
U4
9
A
4580M
C2
7
7
330P
VR
105A
W
100K
9EQ IN-L
9EQ OUT
-L
16K-L
8K-L
2K-L
1K-L
500-L
250-L
R4
5
2
20K
K-L
125-L
63-L
VR
104A
W1
0
0
K
VR
103A
W1
0
0
K
VR
102A
W1
0
0
K
VR
101A
W
100K
VR
100A
W
100K
VR
99A
W1
0
0
K
VR
98A
W
100K
VR
97A
W
100K
C1
3
7
47uF
/25V
C1
3
8
47uF
/25V
R
451
4K70
R
447
150K
R
450
4K70
5
6
7
U
49B
4580M
C2
7
8
330P
VR
105B
W1
0
0
K
9EQ IN-R
9EQ OUT
-R
16K-R
8K-R
2K-R
1K-R
500-R
250-R
R
453
20K
K-R
125-R
63-R
VR
104B
W
100K
VR
103B
W
100K
VR
102B
W1
0
0
K
VR
101B
W1
0
0
K
VR
100B
W1
0
0
K
VR
99B
W1
0
0
K
VR
98B
W1
0
0
K
VR
97B
W1
0
0
K
-17V
17V
9E
Q
R1
4
6
10K
LD
24
YE
L
C2
7
6
4.7uF
/25V
3
5
7
R
L1B
RY
-5
W
-K
6
8
R
L1C
RY
-5
W
-K
EFFECT
C
275
4.7uF
/25V
C
274
4.7uF
/25V
(MU
T
E
)
(MU
T
E
)
E
FFE
C
T
Ne
C276
1
Ne
C275_1
NetC27
1
2
1
3
SW
47A
PS-
42E85L
5
6
SW
47B
PS-
42E85L
R
271
5K1
R
272
5K1
PFL
A
/PFL L
A
/PFL R
A
/PFL L
A
/PFL R
R
148
10K
R
147
10K
R
150
10K
R
149
10K
R
152
10K
R
151
10K
VR
94
W
50K
A
UX GND
A
UX1
A
UX1
VR
95
W
50K
A
UX GND
A
UX2
A
UX2
VR
96
W
50K
A
UX GND
A
UX3
A
UX3
R
290
17K4
R
291
17K4
R
292
17K4
VR
93A
D
10K
R
302
17K4
LEFT
-BUS
LEFT
-BUS
VR
93B
D
10K
R
303
17K4
EF
F
E
CT RTN
1
2
RL
1
A
RY
-5
W
-K
5
V
C2
2
9
100N
D1
2
RL
S
4
1
4
8
NetT
R32
C
R1
5
4
10K
TR
1
0
3904
DGND
DGND
TR
3
0
3906
R
153
10K
DGND
DGND
R
214
47K
C2
7
9
330uF
/16V
5
V
TR
9
3904
R8
6
20K
R
456
470R
DGND
DGND
1
2
3
5
6
7
8
9
10
11
12
13
1
15
16
CN1
H
EAD
ER
8X
2
1
2
3
COM
EN
2
SD
B161PVB15F
S
1
2
3
COM
EN
1
SD
B161PVB15F
S
1
2
3
5
6
7
8
AR
1
680R
*4
1
2
3
5
6
7
8
AR
2
680R
*4
DGND
DGND
5
V
5
V
1
2
8
1
2
8
PR
ESET
VAR
IAT
ION
DGND
NetR
85_2
NetR
86_2
NetC332
2
NetCN1
16
JP1
PGND
1
2
3
5
6
7
8
9
10
11
12
13
1
15
16
CN5
Z-DS
P
GND
17V
-17V
NetC276_1
NetC275
1
NetT
R32_C
5
V
NetCN1_16
NetU58_1
NetC27
1
PGND
DGND
NetLD21_2
NetC332_2
NetR
86
2
NetR
85_2
R4
5
7
220R
R4
5
8
220R
DGND
(MU
T
E
)
LD
21
RE
D
17V
PEAK(
F
L
IC
KER
)
MUT
E
(G
L
O
W
)
3c
5e
1a
d
2b
X2
5
JY
-6351G-
02-
250
FOOT
SW
IT
C
H
1
2
3
SW
11A
PS-
22E85L
NetU58
1
NetLD21_2
DSP
LD
25
GR
LD
26
GR
LD
27
GR
LD
28
GR
LD
29
GR
LD
30
GR
LD
31
GR
LD
32
GR
R4
5
4
120R
1/4W
-17V
LD
35
GR
LD
36
GR
LD
37
GR
LD
38
GR
LD
39
GR
LD
40
GR
LD
41
GR
LD
42
GR
-17V
LE
FT M
E
TE
R
(
30)
(
20)
(
10)
(
7)
(
4)
(
2)
(0)
(+
2)
5
6
7
U
50B
4580M
R4
6
6
0R
0
R4
6
4
100K
C
280
47uF
/25V
PGND
LD
43
GR
LD
44
GR
LD
47
YE
L
LD
22
RE
D
LD
33
GR
LD
34
GR
LD
46
YE
L
LD
20
RE
D
TR
2
9
3906
17V
D1
A
D
A
204K
D1
B
D
A
204K
TR
3
1
3906
R4
5
9
120R
1/4W
R
463
510R
R4
6
2
510R
R1
5
5
10K
PGND
3
2
1
U5
0
A
4580M
R4
6
7
0R
0
R
465
100K
C
281
47uF
/25V
PGND
R
-ME
TE
R
L
-ME
TE
R
LD
23
GR
R4
8
1
2K
PGND
(+
4)
(+
7)
(+
10)
(+
18)
PW
R O
N
R
389
10K
R
388
10K
PGND
PGND
D8
4148
D9 4148
D1
0
4148
D1
1
4148
L
-ME
TE
R
R
-ME
TE
R
8
U5
0
C
4580M
C2
3
1
100n
C2
3
0
100n
R4
8
3
47R
R4
8
2
47R
C1
3
9
47uF
/25V
C1
4
0
47uF
/25V
17V
-17V
PGND
1
2
3
CN3 H
EAD
ER
4
17V
-17V
1
2
3
CN6
H
EAD
ER
4
5
V
8V
PGND
DGND
C2
8
2
47uF
/25V
C2
8
3
47uF
/25V
PGND
PGND
17V
R2
4
6
20K
R
247
20K
R2
4
8
300K
R2
4
9
300K
1
2
3
5
6
7
8
9
10
CN2 H
EAD
ER
10
A
UX GND
LEFT
-BUS
RIGHT
-BUS
A
UX1
A
/PFL L
A
UX2
A
UX3
A
UX
A
/PFL R
LEFT
-BUS
RIGHT
-BUS
A
UX1
A
UX2
A
UX3
A
UX
A
PFL L
A
PFL R
T
R11
BC8
7
T
R13
BC8
7
T
R15
BC8
7
T
R17
BC8
7
T
R19
BC8
7
T
R21
BC8
7
T
R23
BC8
7
T
R25
BC8
7
T
R27
BC8
7
C1
9
0.
22uF/50V
C2
1
105P
C239
0.
22uF/50V
C2
3
7
P
C2
5
10
P
C2
9
18
P
C251
12
P
C2
7
10
P
C253
153P
C259
683P
C270
332P
C272
392P
C265
123P
C267
822P
C263
123P
C257
153P
C255
153P
C261
273P
R
10
6K2
R
28
200R
R392
68K
R
12
6K2
R
30
200R
R39
68K
R
1
6K2
R
36
220R
R396
68K
R
16
6K2
R
110R
R398
68K
R
26
6K2
R
93
60R
R
08
68K
R
2
6K2
R
97
22R
R
06
68K
R
22
6K2
R
91
60R
R
0
68K
R
20
6K2
R
32
200R
R
02
68K
R
18
6K2
R
89
270R
R
00
68K
17V
1K-R
17V
-17V
17V
-17V
17V
-17V
17V
-17V
-17V
17V
-17V
1
7
V
-17V
17V
-17V
17V
-17V
63-R
125-R
250-R
500-R
8K-R
K-R
16K-R
2K-R
R
3
169R
R
38
18R
R
0
18R
R
95
7R
R
2
18R
R
99
33R
T
R16
BC8
7
C2
6
10
P
C250
18
P
R
15
6K2
R
37
220R
R397
68K
17V
-17V
250-L
T
R12
BC8
7
T
R1
BC8
7
C150
0.
22uF/50V
C2
2
105P
C2
0
0.
22uF/50V
C2
7
P
R
11
6K2
R
29
200R
R393
68K
R
13
6K2
R
31
200R
R395
68K
17V
-17V
17V
-17V
63-L
125-L
R
35
169R
R
39
18R
T
R18
BC8
7
T
R20
BC8
7
T
R22
BC8
7
C252
12
P
C2
8
10
P
C25
153P
C260
683P
C256
153P
C262
273P
R
17
6K2
R
5
110R
R399
68K
R
21
6K2
R
33
200R
R
03
68K
R
19
6K2
R
90
270R
R
01
68K
17V
1K-L
17V
-17V
-17V
17V
-17V
500-L
2K-L
R
1
18R
T
R2
BC8
7
T
R26
BC8
7
T
R28
BC8
7
C271
332P
C273
392P
C266
123P
C268
822P
C26
123P
C258
153P
R
27
6K2
R
9
60R
R
09
68K
R
25
6K2
R
98
22R
R
07
68K
R
23
6K2
R
92
60R
R
05
68K
-17V
17V
-17V
1
7
V
17V
-17V
8K-L
K-L
16K-L
R500
33R
R
3
18R
R
96
7R
NetU21_8
NetU21
1
7
V
NetCN8_5
NetCN8_7
NetCN8_9
NetCN8_11
NetCN8_13
NetCN8
15
PGND
NetCN8_
NetCN8_6
NetCN8_8
NetCN8
10
NetCN8_12
NetCN8_1
NetCN8_16
NetU21_8
NetU21
17V
NetCN7_5
NetCN7_7
NetCN7_9
NetCN7_11
NetCN7_13
NetCN7
15
NetCN7_16
PGND
NetCN7_
NetCN7_6
NetCN7_8
NetCN7
10
NetCN7_12
NetCN7_1
1
2
3
5
6
7
8
9
10
11
12
13
1
15
16
17
CN7
1
2
VME
TE
R
-R
1
2
3
5
6
7
8
9
10
11
12
13
1
15
16
17
CN8
1
2
VME
TE
R
-L
NetCN8_16
NetCN7_16
NetCN7_15
NetCN8_15
NetCN7
1
NetCN7_13
NetCN7
12
NetCN7_11
NetCN7_10
NetCN7_9
NetCN7_8
NetCN7
7
NetCN7_6
NetCN7
5
NetCN7_
NetCN8_1
NetCN8_13
NetCN8_12
NetCN8_11
NetCN8
10
NetCN8_9
NetCN8
8
NetCN8_7
NetCN8_6
NetCN8_5
NetCN8_
RIGHT
-BUS
RIGHT
-BUS
8
7
9
SW37C
PS-
2E85L-2
PGND
NetU21
8
NetU21_