Alto Dragonfly PM-12 Service Manual page 28

1 2
D
C
B
C221 C223 C225 C227
100n 100n 100n 100n
+VCC
U25C U26C U27C U28C
4580M 4580M 4580M 4580M
A
-VCC
C222 C224 C226 C228
100n 100n 100n 100n
1 2
3
R293 C177
10K
22p
C175
47u/25V
R295
5K1
AUX-RTN1-L
2
AUX-RTN1-L
1
R21 3
C173
15K U25A
100P C179
4580M
47u/25V
R326
5K1
R294
C178
10K
22P
R296 R325
5K1 5K1
AUX-RTN1-R
6
AUX-RTN1-R
7
R22 5
C174 C176
15K U25B
100P 47u/25V C180
4580M
47u/25V
R301
10K C189 22P
C191
R303
5K1 47u/25V
AUX-RTN2-L 2
AUX-RTN2-L
1
R23 3
C185 C187
15K U26A
100P 47u/25V R332
4580M
5K1
R300
C190
10K
22P
R304 R331
5K1
5K1
AUX-RTN2-R 6
AUX-RTN2-R
7
R24 5
C186
C188
100P 15K U26B C192
47u/25V
4580M
47u/25V
R302
10K 22P
C201
AUX RETURN 3
R305
5K1
AUX-RTN3-L
2
AUX-RTN3-L
1
C197 C199 R25 3
15K U27A
100P 47u/25V C203 R315
4580M 47u/25V
5K1
C202
22P
R310
10K
R314
R312
5K1 5K1
AUX-RTN3-R 6
AUX-RTN3-R
7
R26
C198 5
C200
15K U27B C204
100P
47u/25V
4580M
47u/25V
R316
10K
R317
10K
R311 C213
10K 22P
C211
C215
47u/25V R313
15K
47u/25V
AUX-RTN4-L 2
AUX-RTN4-L
1
R27 3
C209
15K U28A
100P
4580M
R337
5K1
C214
22P
R321
10K
R322 R341 R323
5K1 5K1
15K
AUX-RTN4-R
6
AUX-RTN4-R
7
R28 5
C210
C212
100P 15K U28B C216
47u/25V
4580M
47u/25V
C229 C231 C233
100n 100n 100n
C235
U29C U30C U31C U32C 100n
4580M 4580M 4580M 4580M
C230 C232 C234 C236
100n 100n 100n 100n
3
4 5
C13
AUX RETURN 1
47u/25V
C181
VR52A
R329
22P
W50K
3K6
R343
36K
2
1
R298 3
R351
56K
U29A 20K
R328 C183
LEFT-BUS
5K1 4580M 47u/25V
R330
3K6
C182
22P
VR52B
W50K R344
C14
36K
47u/25V
R327
R352
5K1
6 20K
7 RIGHT-BUS
5
R297
C184
U29B
56K
47u/25V
4580M
C27
AUX RETURN 2 R335
47u/25V
3K6
C193
VR45A
22P
W50K
R345
R306 36K
56K
2
1
3 R354
R334
C28
U30A C195 20K
5K1 R336
LEFT-BUS
47u/25V
3K6
4580M 47u/25V
VR45B
C194
W50K
22P
R333 R347
R308
5K1 36K
56K
R355
6
20K
7 RIGHT-BUS
5
C196
U30B
47u/25V
4580M
C205
VR46A
R338
22P
W50K
C29
3K6
47u/25V
R346
R307 36K
56K
2
1
3
SW32A
U31A
C207
PS-22E85L
4580M 47u/25V
VR46B
C206
R339
W50K
22P MAIN MIX / CTRL/R
C30
3K6
47u/25V
R349
R320 SW32B
36K
PS-22E85L
56K
6
7
5
C208
U31B
47u/25V
4580M
AUX RETURN 4
R340
VR47A
10K
C217
W50K
22P
C31
R358
47u/25V
20K
R348
R319 22K
100K
2
R359
1
20K
3
R318
U32A C219
5K1 R342 4580M 47u/25V
R360
VR47B
10K C218 20K
W50K
22P
C32
47u/25V
R350
R324
22K R362
100K
20K
6
7
5
R363
C220 20K
U32B
47u/25V
4580M
R364
20K
27
4 5
6
SW31C
R367
PS-42E85L
7
27K
8
9
AFL-L
SW31B
R368
PS-42E85L
LEFT-BUS
4
27K
5
6
AFL-R
SW31A
R299
PS-42E85L
1
10K
2
PGND
3
SOLO(PFL)
RIGHT-BUS
AUX-1
R353
4K7
VR48
W50K
TO AUX SEND1
R369
27K
R370
LEFT-BUS
27K
R309
10K
RIGHT-BUS
TO AUX SEND2
AUX-2
R357
5K1
VR49
W50K
R371
27K
R356
20K
LEFT-BUS
LEFT-BUS
R376
10K
CTRL/L
R361
20K
RIGHT-BUS
RIGHT-BUS
R377
10K
CTRL/R
R374
27K
R372
30K
R373
30K
SW35A
PS-22E85L
1
2
3
LEFT-BUS
SW35B
PS-22E85L
4
5
6
RIGHT-BUS
SW33A
PS-22E85L
1
2
3
SUB1
SW33B
PS-22E85L
4
5
6
SUB2
SW34A
PS-22E85L
1
2
3
SUB3
SW34B
PS-22E85L DFX TO MONITOR
4
5
AUX1
6
SUB4 AUX-1
R365
5K1
VR50
W50K
AUX-2
R366
5K1
VR51
W50K
DFX TO MONITOR
AUX2
6
7 8
AUXRTN
LD9 D
RED
(SOLO)
-RVCC
R375
10
2K2
11
LOGIC
12
LOGIC
SW31D D13
PS-42E85L BAS316
(LOGIC=2.0V or 0.5V)
C
B
A
Titel
AUX RETURN
PCB# PM12MN2.PCB
Size Model No: Revision
A2 ALTO PM12
VER031030
Date: 8-Mar-2005 Sheet 4 of 7
File: PM12MN2.S04 Drawn By: Bao.
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