Yamaha NS-BP300, Service Manual

Page: 66 / 84

★
All voltages are measured with a 10MΩ/V DC electronic voltmeter.
★
Components having special characteristics are marked
⚠
and must be replaced
with parts having specifications equal to those originally installed.
★
Schematic diagram is subject to change without notice.
A
1
2
3
4
5
6
7
8
9
10
B C D E F G H I J K L M N
R-840/NS-BP300
66
MAIN 1/4
IC503
CB505
CB502
W502
CB503
W501
CB504
9.0
0 0
0 0 0 0 0
0
0.8
4.9
4.9
-6.9
0 0 0
0
4.4 4.4
7.0
0
0
0
4.4 4.4
-6.9
2.4
14.2
2.4 2.4
27.0
4.9 0.8
0
14.2
7.0
-6.9
27.0
36.8
36.2
27.8
0
0
9.1
32.1
20.0
0
14.2
7.7
4.4
7.7
3.8
20.0
27.9
39.2
-39.4
0 0
AC57.8
-6.8
38.0
0
-0.6
-0.6
0
0
39.2
-0.2
-0.2
-0.7
-0.7
0
38.1
39.2
-0.2
-0.2
-6.8
0
0
-38.9
-38.9
-39.3
-0.6
-38.4
-38.4
-0.7
-38.3
-38.3
-38.9
-38.4
-39.5
38.0
38.7
1.1
39.3
0
0
0.6
0.6
39.3
38.9
0
-0.5
0
-39.3
-1.0
-0.5
-39.3
38.2
38.2
-38.8
-39.3
-1.0
-38.2
0
0
-1.0
-1.0
1.1
1.1
-0.4
-39.0
-1.2
-1.2
-0.6
-0.6
0
0
0
0
0
0
0
-38.4
-38.9
-39.5
-39.5
-39.5
0
38.8
0
0
0.2
0.2
1.2
-1.2
1.1
38.1
1.1
39.2
39.2
39.2
1.1
-0.5
-1.2
38.7
0
39.2
39.0
39.0
0
0
0
38.8
38.8
0
0
OUT L
IC503 : KIA7809API-U/P
Voltage regulator
R1
R2
R3
R4
R5
R6
R7
R8
Z1
Q12
Q13
Q18
Q17
Q14
Q19
Q10
Q8
Q16
INPUT
OUTPUT
COMMON (GND)
Q15
Q11-1 Q11
Q2
Q3
Q4
Q5 Q9
Q7
Q1
Q6
R12
R19
R10
R9
R15
R14
R16
R21
R20
R22 R23 R17
R13
R11
R18
C1
1
3
2
MAIN (1)
SPEAKERS
REGULATOR
To POWER TRANSFORMER
to FUNCTION (1)_CB305
Page 63 K6
to FUNCTION (1)_CB102
Page 65 D9
to MAIN (8)_CB506
Page 69 J5
to MAIN (2)_CB401
Page 67 B7