Yamaha A-S300, Service Manual

Page: 56 / 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
A-S500/A-S300
56
OPERATION 2/2
★
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。
CB10
CB9
CB8
CB3
IC4
CB4
CB16
IC1
IC2
W1A
W1B
IC3
CB2
CB17
CB21
(7.5)
(7.5)
(3.6)
(0)
(0)
(0)
(0)
(3.2)
(3.2)
(7.3)
(3.6)
(0)
(0)
(0)
(0)
(0)
(0.2)
(0.2)
(0)
(0)
(1.0)
(0)
(7.3)
(7.5)
(7.5)
(1.1)
(7.3)
0
(7.3)
4.4
4.5
9.2
0
0
3.6
9.2
0.7
0
0
0
0.2
0.2
0.2
0
0
0
0
0
0
0
5.0
0
9.2
4.7
5.0
5.1
5.6
5.6
5.2
0
9.2
0.8
0.2
5.6
5.6
0
9.2
5.0
5.1 5.0
5.0
5.1
7.0
0.2
0
9.2
Primary side ground
AC9.1
0
10.2
4.7
0
10.2
4.3
AC8.4
IC4 : TC4013BP
Dual D-type flip flop
4
RESET1
1 Q1
6 SET1
5 DATA1
CL
3 CLOCK1
CL
CL
CL
CL
CL
2 Q1
10 RESET2
13 Q2
8 SET2
9
DATA2
7
VSS
14 VDD
11 CLOCK2
12 Q2
CL
CL
CL
CL
CL
CL
1
2
3
4 11
12
13
14
5
6
7 8
9
10
Vss SET2
CK2
VDD
Q2
INPUTS OUTPUTS
: Don't care
: Level change
˙ : No change
RESET
L
H
H
L
L
L
Q2
DATA2
RESET2
SET1
RESET1
CK1
Q1
Q1
DATA1
SET
H
L
H
L
L
L
DATA
L
H
CK Qn + 1
H
L
H
L
H
Qn˙
Qn + 1
L
H
H
H
L
Qn˙
IC1 : R1190H055B-T1-FE
Voltage regulator
V DD
CE
Pin No.
1
2
3
5
6
Symbol
V
OUT
GND
CE
GND
V DD
Description
Output Pin
Ground Pin
Chip Enable Pin ("H" Active)
4 DELAY Delay Pin (for setting Inrush Current Limit Time)
Ground Pin
Input Pin
Vref
Thermal Shutdown
6 1
3 2,5
Inrush
Current
Limit Peak
Current
Protection
Short
Protection
V OUT
GND
4
DELAY
OPERATION (7)
OPERATION (1)
R model
SUB-
TRANSFORMER
POWER
TRANSFORMER
A-S300
VOLTAGE SELECTOR
220V – 240V 110V – 120V
to POWER TRANSFORMER
to FUNCTION (1)_W503
Page 53 J8
to DOCK_W301
Page 61 L7
to POWER TRANSFORMER
to POWER TRANSFORMER
(U, C, R, T, A, B, G, L models)
to AC IN
to OPERATION (2)_W809A, W809B
(J model)
Page 55 B6
to MAIN (5)_CB8
(J model)
Page 59 B2