Page 1
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更 改数 量 更改单号 签 名日 期
1
设 计审 核
From Trans.
XS1
3PIN
1
2
3
23
标 准 化
RESET
C415
10u/16V
批 准
R404
10k
20p
20p
C417
C418
MA-900
功放板原理图
4
第 张共 张
广东步步高电子工业有限公司
5
6
版次：
BBK
From Input Board
GG
L
R
C
SL
SR
SW
XS2
7PIN
7
6
5
4
3
2
1
R415
R421
R423
R425
R427
R416
R418
R419
R422
R424
R426
4.7k
22k
22k
4.7k
22k
4.7k
4.7k
22k
R428
4.7k
4.7k
22k
22k
C419
2.2u/16V
R417
150k
C420
2.2u/16V
R420
150k
C421
2.2u/16V
C422
2.2u/16V
C423
2.2u/16V
R429
150k
G401
4M
R414
10
E
Vs
C401
224
C402
224
FL401
T4AL250V
FL402
T4AL250V
R413
10
C424
103
10
R430
150k
1
2
3
4
5
6
7
8
9
VD412
1N4004
VD413
1N4004
N402
RST/Vpp
P3.0
P3.1
XTAL2
XTAL1
P3.2
P3.3
P3.4
P3.5
GND
AT89C2051
1
2
3
4
5
6
7
8
9
10
XS9
3
2
1
CON3
REMOTE
N403
IN1
IN2
IN3
CODE2
DGND
SCL
SDA
IN4
IN5
IN6
PT2258D
R431
150k
6
5
Vcc
P1.7
P1.6
P1.5
P1.4
P1.3
P1.2
P1.1
P1.0
P3.7
C425
102
C416
104
OUT1
OUT2
OUT3
CODE1
OUT4
OUT5
OUT6
N404B
4558
20
19
18
17
16
15
14
13
12
11
Vcc
REF
GND
+5V
R466
10k
7
+5V
VD405
VD406
RL254
20
19
18
17
16
15
14
13
12
11
C426
2.2/16V
R432
100k
VD401~VD404
RL254
4700u/25V
C404
RL254
C411
4700u/25V
R405 330
R406
470
R407
470
R408 470
R409
470
R410
470
R411
470
R412
470
R470
470
C427
2.2u/16V
C431
+9V
2.2u/16V
C432
47u/16V
C434
2.2u/16V
D
C403
4700u/25V
Vs
C429
2.2u/16V
C433
2.2u/16V
C405
104
C406
104
C435
2.2u/16V
100k
R439
A+18V
A-18V
B+18V
220/0.5W
220/0.5W
1
R433
100k
R436
100k
R440
10k
R401
VD409
12V
VD410
R402
N401
7809
Vin
R445
100k
12V
R446
47k
1
2
3
4
5
6
7
8
9
10
11
12
11PIN
R434
2
3
GND
2
XS3
10k
R437
10k
R441
470u/16V
470u/16V
Vout
220u/16V
Vs
REMOTE
b1+c1
a2
b2
c2
d2
e2
f2
g2
GND
g1
C460
22k
-12V
8 4
+12V
C407
C408
3
C412
To Display Board
5
6
R435
3
2
R438
12k
151
N406A
4558
R447
100k
C436
103
12k
1
C
B
A
1
+12V
C409
C410
104
104
-12V
C413
104
R403
180
VD411
5.1V
C457
R464
N410
TDA7370B
C451
47u/16V
100k
4
5
12
11
6
10u/16V
L
+5V+9V
C414
47u/16V
SR
R
SL
C448
224
C450
224
C447
224
C449
224
A+18V
7
S-B
Vcc13Vcc
IN1
OUT1
IN2
OUT2
IN3
OUT3
IN4
OUT4
SVR
PG8SG9C.D
C456
1
220u/25V
2
220u/25V
15
220u/25V
14
104
C455
C454
C453
C452
220u/25V
XS5
7PIN
1
2
3
4
5
6
7
GNDGND
C
SR
To Sub-AMP Board
L
R
SL
2
3
10
3
B+18V
53
R460
47
1
2
1
2
C439
22u/25V
+
-
R456
22k
+
-
R452
C459
33p
A+18V
53
A+18V
53
22k
C458
104
4
N408
LM1875
A-18V
N407
LM1875
A-18V
4
4
C446
220u/25V
R461
220/1W
R462
2.2
R457
10
R453
10
C442
104
C440
104
Vs
R463
10
C445
104
4PIN
XP7
1
2
3
4
To Sub-AMP Board
Vs
GND
45
6
N409
TDA2003
R459
22k
R455
1.5k
R454
C438
2.2u/16V
2.2u/16V
22k
C443
1
2
R458
22k
C441
22u/25V
R450
22k
+
-
C444
470u/25V
R451
1.5k
R465
N405B
4558
7
C428
151
+12V
84
N405A
4558
1
-12V
C430
151
R442
R448
100k
C437
182
-12V
N404A
2
4558
3
1
8 4
+12V
22k
100k
R443
10k
R449
220
R467
C462
151
47k
C461
151
R444
22k
N406B
6
4558
5
7
F
E
D
C
B
A
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