Yamaha A-S300, Service Manual

Page: 55 / 81

A
1
2
3
4
5
6
7
8
9
10
B C D E F G H I J K L M N
55
OPERATION 1/2
A-S500/A-S300
★
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.
● 電圧は、内部抵抗 10MΩの電圧計で測定したものです。
● ⚠印のある部品は、安全性確保部品を示しています。部品の交換が必要な場合、
パーツリストに記載されている部品を使用してください。
● 本回路図は標準回路図です。改良のため予告なく変更することがあります。
CB803
W802
W812
JK701
CB706
CB951 CB902
IC901
IC901
CB901
CB804
W804
W803
W801
W805A
W806A W806B
CB853
CB854
CB855
CB852
IC851
CB851
CB856
W805B
CB808
CB802
W809A
W807
W808
IC801
IC801
IC802
IC802
W809B
0
0
15.5
0
0
0
0
0
0
0
0
5.0
5.0
5.0
5.0
0
0
0
0
0
0
0
0
0
0
0
3.6
5.0
0
0
3.6
5.0
0
0
3.6
5.0
0
0
3.6
5.0
0
0
3.6
5.0
0
0
0
0
0
3.6
5.0
0
5.0
0
1.9
0
0
15.5
-15.3
0
0
0
0
0
15.5
-15.3
0
0
0
0
0
0
0
0
4.9
0
0
0
0
0
0
15.5
-15.3
0 0
0
0.7
0.7
0
0
0
0
0
0
0
5.0
5.0
5.0
5.0
5.0
0
0
0
0.6
1.2 0
5.0
5.0
5.0
3.2
5.0
5.0
5.0
0
5.0
5.0
5.0
5.0
0
3.7
2.8
5.0
5.0
5.0
5.0
5.0
5.0
5.0
3.8
2.8
0
5.0
5.0
5.0
5.0
0
3.7
2.8
0
15.5
-15.3
0
0
-15.3
0
0
0
0
0
0
0
0
0
15.5
0
0
0
-15.3
0
0
0
0
0
0 5.0
5.0
-15.3
15.5
-15.3
15.5
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
5.1
0
0
0
0
0
0
0
5.1
0.8
0.6
5.1
0.6 0.6
0.6
0.8
0.4
0
0
0
0
0
0 5.0
5.0
5.0
5.0
5.0
5.0
5.0
OUT L
TONE IN
TONE OUT
VOL OUT
IC851 : LB1641
Motor driver
INPUT LOGIC IN 1 IN 2
VZ
P1 P2 OUT 1 OUT 2 V
CC 2
V
CC 1
GND
PRE DRIVER
1
3 2 8 10 9 7
4
6 5
IC802, 901 : NJM2068MD-TE2
Dual operational amplifier
(IC802: U, C, R, T, A, L models) (B, G, J models)
OUT
1
OUT 2 –IN 1
+IN
1
+IN 2
-IN
2
–V
CC
+V
CC 1
2
3
4
8
7
6
5
+ – + –
IC802 : NJM5532M-D
Dual low noise operational amplifier
A OUTPUT
A-INPUT
A+INPUT
V-
B OUTPUT
B-INPUT
B+INPUT
V+
1
2
3
4
8
7
6
5
+ –
A
B
+ –
PHONES
LOUDNESS
TREBLE
BASS
INPUT
BALANCE
VOLUME
REC OUT
INPUT indicators
PHONO DOCK TUNER DC LINE1 LINE2 LINE3
SPEAKERS
OPERATION (5)
OPERATION (8)
OPERATION (4)
OPERATION (3)
OPERATION (2)
OPERATION (6)
OPERATION (9)
OPERATION (10)
OPERATION (11)
A-S500
A-S500
A-S300
PURE DIRECT
indicator
POWER
indicator
PURE DIRECT
(POWER)
A-S300
to FUNCTION (1)_CB504
Page 53 H2
to OPERATION (1)_W1A, W1B
(J model)
Page 56 K4
to FUNCTION (1)_CB503
Page 53 I2
to FUNCTION (1)_CB505
Page 53 J2
to FUNCTION (1)_W504
Page 53 L4
to DOCK_W302
Page 61 L8
to MAIN (1)_CB108
Page 57 G9
to OPERATION (2)_W808
Page 55 B4
to FUNCTION (1)_W401
Page 53 D8
to OPERATION (9)_CB852
Page 55 K6
(A-S500)
to MAIN (1)_CB108
Page 59 G9
(A-S300)
to MAIN (6)_W10
Page 58 B4
to MAIN (6)_W10
Page 60 B4
(A-S300)
(A-S500)
to MAIN (1)_CB101
Page 57 A6
to MAIN (1)_CB101
Page 59
(A-S500)
(A-S300)
A6