Yamaha NS-BP300 Service Manual page 66

A B C
R-840/NS-BP300
MAIN 1/4
1
Page 63 K6
to FUNCTION (1)_CB305
2
3
4
OUT L
5
6
-6.8 0
0
7
0
-6.8
0
8
9
10
66
D E F
Page 69 J5 Page 65 D9
to MAIN (8)_CB506 to FUNCTION (1)_CB102
38.1
1.1
-0.5
39.2
38.1
-1.2
0 -0.2
-0.7
-0.7 -0.2
-1.2
-38.4
-0.7
-38.4
-38.3
-38.9
-38.9
-38.3
-39.5
-39.5
-39.3
-39.3
-38.9
-38.8
-38.9
-38.4
-38.4 -38.2
-0.6 38.2
38.2
-1.0
-0.6 -0.2
-0.6
0 -0.2
-1.0
38.0 39.2
-0.4
1.1
38.0
G H
Page 67 B7
to MAIN (2)_CB401
REGULATOR
IC503
9.1 14.2
0
32.1
7.7
20.0
4.4
7.7 20.0
3.8
36.2 36.8 0
27.0
27.8
27.9
0
0
39.0
39.2
39.2
38.7
39.0
39.2
1.1 38.8
0
1.2 0
39.2
38.8
0
0.2 0
0.2
38.8
0
0
1.1
0
0
-1.2
0
-0.6
-0.6
-1.2
-39.5
CB504
-39.5 0
0
0
-39.0 0
0
0
0
0
-39.3
-1.0 -39.3
-0.5
-0.5
0
-1.0
0
1.1
0
38.9
0
0.6
0.6
39.3
1.1
38.7 39.3
I J K
MAIN (1)
39.2
0 0
-39.4
CB505
L M N
AC57.8
To POWER TRANSFORMER
SPEAKERS
IC503: KIA7809API-U/P
Voltage regulator
1 INPUT
R22 R17 R23
R1 Q11 Q11-1
Q15
Q16
Q12
Q14 R14
R10 R15
Q17 Q19
R16
R19
R12 3 OUTPUT
Q18 R20
Q6
Q1
R18
R11 R9
R7 C1
Z1
R2 Q10
Q2
Q7 R21
R3
Q13
Q4
Q3 Q5 Q9 Q8
R13
R4 R5
R6 R8
2 COMMON (GND)
★ 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.