Alto Dragonfly PM-12 Service Manual page 26

1 2
D
PRECH9
C73
47u/25V
PRECH10
C74
47u/25V
C
LD5
YEL
SW19D
(SOLO)
PS-42E85L
-RVCC
R233
10
2K2
11
12 LOGIC
LOGIC
D5
BAS316
PGND
(LOGIC=2.0V or 0.5V)
PRECH11
C104
47u/25V
B
PRECH12
C105
47u/25V
LD6
SW20D YEL
(SOLO)
PS-42E85L
-RVCC
R234
10
2K2
11
LOGIC
12
LOGIC
D6
BAS316
PGND
(LOGIC=2.0V or 0.5V)
A
U18C
LM393
1 2
3
VR24A
EQ HI (12KHz)
C79
B50K
3.3n(M)
C78 R139 R140
1K8 1K8
R153 22P
10K
VR26A
B50K
C75
HI-MID(3KHz)
R191
1n(M) R171 R184
12K
200K
1M
2
1 R183
R133 C80
3
220K 1M
C76 3.3n(M)
2
12n(M)
U12A
3
4580M
R167 R195
47K
22K
R137 R176
VR25A R175
MID-LO(500Hz)
1K8 B50K 6K8 6K8
R138
VR27A
C81
C77
1K8
B50K
47n(M)
12n(M)
LO(80Hz)
VR24B
EQ HI (12KHz)
C88
B50K
3.3n(M)
C87 R143 R144
1K8 1K8
22P
R158
10K
VR26B
B50K
C84
HI-MID(3KHz)
R192
R172
1n(M) R186
12K
200K 1M
6
7 R185
R134
C89
5
220K 1M
3.3n(M)
C85
6
12n(M)
U12B
5
R168 4580M R196
22K 47K
R178
R141 VR25B R177
MID-LO(500Hz)
1K8 B50K 6K8 6K8
R142
VR27B
C90
C86
1K8 B50K
47n(M)
12n(M)
LO(80Hz)
VR40A
EQ HI (12KHz)
C110
B50K
3.3n(M)
C109 R147 R149
1K8 1K8
R160 22P
10K
VR42A
B50K
C106
HI-MID(3KHz)
R193
1n(M) R173 R188
12K
200K 1M
2
1 R187
R135 C111
3
220K 1M
C107 3.3n(M)
2
12n(M)
U14A
3
4580M
R169 R197
47K
22K
R180
R145 VR41A R179
MID-LO(500Hz)
1K8 B50K 6K8 6K8
R146
VR43A
C112
C108
1K8
B50K
47n(M)
12n(M)
LO(80Hz)
VR40B
EQ HI (12KHz)
C118
B50K
3.3n(M)
C117 R148 R150
1K8 1K8
22P
R161
10K
VR42B
B50K
C114
HI-MID(3KHz)
R194
R174
1n(M) R189
12K
200K 1M
6
7 R190
R136
C119
5
220K 1M
3.3n(M)
C115
6
12n(M)
U14B
5
4580M R198
R170
22K 47K
R182
R151 VR41B R181
MID-LO(500Hz)
1K8 B50K 6K8 6K8
R152
VR43B C120
C116
1K8 B50K
47n(M)
12n(M)
LO(80Hz)
C129 C130 C135
+RVCC
100n 100n 100n
U19C U20C
LM393 4580M
C136
100n
25
PGND -RVCC
3
4 5
R201
5K1
LD7
SW17C
RED
R199
PS-42E85L
7
8
3K3
9
+RVCC
PGND
SW17B
R669
C82
PS-42E85L
15K R202
22P
5K1
4
5
6
R17
8K2
1
R670
C83 MUTE
15K
U13A 47u/25V
4580M VR38A
R18
10KD
R154
8K2 LEVEL
SW17A
8K2
PS-42E85L
1
2
3
R159
8K2
VR38B
10KD
LEVEL
C91
+RVCC
22P
R247
R244
10K
U18B
20K
5 393
PGND
R235
7
D7
7 100K 6
4148
+RVCC
C92
U13B
47u/25V
U20B
4580M
R243
R241
6 PGND
4580M
10K
7 10K PGND
R253
5
8
150R
3
D8
1
4148
2
U18A R246
4 4K7
R239 393
C93
R236
100K
1uF
8K2
PGND PGND PGND
R209
5K1
SW18C
PS-42E85L
7
8
R200
9
+RVCC
PGND
3K3
LD8
RED
C113
R671
R214
22P
15K 5K1
PS-42E85L
SW18B
4
5
6
1
R19
8K2
C122
U15A 47u/25V
MUTE
4580M
VR39A
10KD
R162
LEVEL
8K2 R20
8K2
PS-42E85L
SW18A
1
2
R163
3
8K2
VR39B
10KD
LEVEL
+RVCC
C121
R254
22P
R238
10K
U19B
R237
20K
393
100K 5
7
4148
PGND 6
D17
+RVCC
7
U20A
2 PGND R256
C123
R252
4580M 1 R242 PGND
U15B 10K
47u/25V
3 10K
4580M 150R 8
3
D18
1
4148
2
R251
R240
4
4K7
C124 R248 U19A
100K
1uF 8K2
393
PGND PGND PGND
C137 C139 C141 C143
100n 100n 100n 100n
+VCC
U13C U14C U15C U16C
4580M 4580M 4580M 4580M
-VCC
C138 C140 C142 C144
100n 100n 100n 100n
4 5
6
PM12
C95
22P
R226
12K
C97
R4
SW25A
2 47u/25V
4K7 R203
PS-22E85L
1 1
12K
3 2
U16A 3
4580M
R156
SW25B
VR36 BAL
10K R204
PS-22E85L
W50K 4
12K
C94
5
22P
6
R155
R225
10K
12K
6
SW19C
7
R229
PS-42E85L
5 7
4K7 15K
8
C96 R3
9
U16B
47u/25V
4580M
SW19B
R230
PS-42E85L
4
15K
5
6
SW19A
R157
PS-42E85L
1
10K
2
3
AUX1/2 PRE/POST
SW15A
PS-22E85L
1
2
3 VR28
SW15B
W50K
PS-22E85L R210
4
5K1
5
6
D1
R255
R211
4148
27K
5K1
VR29
W50K
TR8
C3
HR
1uF
TR7
7002
LD3
LED-2P
紅 綠
C4 R245
470P
1K
PGND
C125
22P
R227
12K
C127
R1
SW26A
2
47u/25V 4K7 R215
PS-22E85L
1
12K
3 2
U17A BAL
VR37
4580M
R165
SW26B
W50K
R216
10K
PS-22E85L
12K
C126
5
22P
R164
R228
10K
12K
6
SW20C
7
R231
PS-42E85L
5
15K
8
C128 R2
U17B
47u/25V 4K7
R672
4580M
SW20B
15K R232
PS-42E85L
15K
5
SW20A
R166
PS-42E85L
10K
2
AUX1/2 PRE/POST
SW16A
PS-22E85L
1
2
3
VR32
SW16B
W50K
D2
PS-22E85L R217
4
4148 5K1
5
R249
6
27K
R224
TR11
5K1
HR
C2
VR33
1uF
W50K
TR10
7002
LD4
LED-2P
紅 綠
C1 R250
470P 1K
PGND
C145 C147
100n 100n
U17C U12C
4580M 4580M
C146 C148
100n 100n
6
7 8
CH9-12 (STEREO)
SW21A
R205
PS-22E85L
1
12K
2
3
SUB1
SW21B
R206
LEFT-BUS
PS-22E85L
4
12K
5
D
6
SUB2
SW23A
R207
RIGHT-BUS PS-22E85L
1
12K
2
3
SUB3
SW23B
R208
PS-22E85L
4
12K
5
6
AFL-L SUB4
AFL-R
SOLO(PFL)
AUX-3
AUX-1
VR30
W50K
R212
5K1
AUX-4
R213
5K1
AUX-2
VR31
W50K
C
SW22A
R220
PS-22E85L
1
12K
2
1 3
SUB1
SW22B
3
R221
LEFT-BUS
PS-22E85L
4
12K
5
4 6
SUB2
SW24A
6
RIGHT-BUS R222 PS-22E85L
1
12K
2
3
SUB3
SW24B
R223
PS-22E85L
7 4
12K
5
9 6
AFL-L SUB4
B
4
6
AFL-R
1
3
SOLO(PFL)
AUX-3
AUX-1
VR34
W50K
R218
5K1
AUX-4
R219
AUX-2 5K1
VR35
W50K
A
Titel
MAIN INPUT STAGE (CH9-CH12)
PCB# L12MN1.PCB
Size Model No: Revision
A2 ALTO PM12
VER031030
Date: 8-Mar-2005 Sheet 1 of 7
File: PM12MN2.S01 Drawn By: Bao.
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