Yamaha YSP-600 Service Manual page 78

A B C
YSP-600/HTY-760
INPUT 2/2
1
2
3
4
CB501
AC IN
CB502 CB503
5
AC6.4
6
7
8
9
10
# All voltages are measured with a 10MΩ/V DC electronic voltmeter.
# Components having special characteristics are marked s and must be replaced
with parts having specifications equal to those originally installed.
# Schematic diagram is subject to change without notice.
78
D E F
(111.6)
(333.7)
(113.9)
IC511
(15.2)
(4.0)
(4.0)
(0.7) (5.1)
(15.2)
(0.7) (4.0)
IC504
5.0
(0) (1.3)
(0)
4.0
Primary side ground
10.2
(143.5)
(78.5)
(143.5)
(3.5) 3.3
(78.5)
(0)
(0) (7.6)
(7.6) (3.5) (0.8)
3.3 3.3
(3.8) 3.3
IC503
(0.8) 0.1
(0)
(0) (7.6) 0.1
(3.9)
(0)
(4.0)
(0) (0) 0
0 (0) 0
(0)
(0)
(4.0)
4.1 4.1
(0)
0.2
0
IC501
3.9 Primary side ground
0.2 1.0
1.0
0.8
0 0
0.1
0.2 0.1
5 k-ohms
10 W
G H
5 k-ohms
10 W
0
AC5.5
AC1.1
5.2
(332.5)
0
(476.4)
(33.2)
(33.2)
AC1.0
(1.0)
AC3.0
(0.1)
0
(1.0)
15.3
(1.3)
5.0
4.0
0
4.0
0
10.4
(15.2) (-0.1)
(15.2) 0
(0)
2 1
A-2
0 -26.3
3.3
10.2 4.0
3.3
0
IC506
0 3.3
0 4.0
10.2 4.0
0
0
INPUT (1)
IC505: FA5511N-D1-TE1
IC502: TC4013BP
CMOS IC for switching power supply control
Dual D-type flip flop
4
RESET1
SET1 6
1 Q1 REF
(7)
5
DATA1
2 Q1 5V VCC
CL
CL
ENB
CL CL 5V REF
CLOCK1 3 CL
CL
Q1 1 VDD
14
RESET2 10 3.5V
8 Q1 2 13 Q2 FB
SET2 13 Q2
(2)
CK1 3 12 Q2
DATA2 9
12 Q2
CL CL RESET1 4 11 Dmax
CK2
FA5510: 46%
CL
CL FA5511: 70%
DATA1 5 10 RESET2
CLOCK2 11 CL
CL SET1 6 9 DATA2
V 7
SS
Vss 7 8 SET2
VDD 14
INPUTS OUTPUTS
RESET SET DATA CK Qn + 1 Qn + 1
L H * * H L
H L * * L H
H H * * H H
L L L L H
* : Don't care
L L H H L : Level change
L L * Qn˙ Qn˙ ˙ : No change
CAUTION !
Safety measures
• Some internal parts in this product contain high voltages and are dangerous. Be sure to take safety measures during servicing, such as wearing insulating gloves.
• Note that positions indicated below are dangerous even after the power is turned off because an electric charge remains and a high voltage continues to exist there.
Before starting any repair work, perform discharge by connecting a discharge resistor (5k-ohms/10W) between terminals at following positions. The time required for
discharging is about 30 seconds.
1. C502 on INPUT (1) P.C.B..
2. C523 on INPUT (1) P.C.B.
.
I J K
4.0
0 10.4
0
13.8 11.9
IC510
13.8 11.9
0
3.4
4.3
0
0
-24.8
-26.3 -24.2
IC506: AN77L04
Low dropout voltage regulator
VCC(6)
CS(8)
Input Short Circuit
Protection
5.2µA
0.8V/0.68V 15.5V
0.95mA
UVLO
15.5V
Error Amp.
+
8.5V/7.9V
16.5V/9V -
0.8V
OUT
ENB
(5)
4V
OUT
PUT
PWM
1 3
GND
IN GND
OSC
(4)
R
RT CT
QB
+0.24V
Q
S
FF IC507: NJM431U
5V Controlled block Adjustable precision shunt regulator
RT(1) IS+(3)
1 2 3
REFERENCE ANODE CATHODE
注意！
安全対策
・ この製品の内部には高電圧部分があり危険です。修理の際は、絶縁性の手袋を使用するなどの安全対策を行ってください。
・ 下記箇所には電源をOFFにした後も電荷が残り、高電圧が維持されており危険です。
修理作業前に放電用抵抗 （5 kΩ/10 W） を下記箇所の端子間に接続して放電してください。放電所用時間は約30秒間です。
1. INPUT （1） P.C.B.のC502
2. INPUT （1） P.C.B.のC523
L M N
W508
Page 77 H2
to INPUT (2)_CB7
CB504
Page 76 H9
to DSP_CB607
CB505
Page 77 H4
to INPUT (2)_CB4
Page 77 E6
to INPUT (2)_CB8
W509
W506
Page 77 H7
to INPUT (3)_CB901
W507
Page 75 K4
to DSP_CB203
POINT A-2 1 / D521, 2 / Q504
D521 (C) 1
Q504 (C) 2
Power cable ON Power cable OFF Power cable ON
IC510: NJM78M12FA
Voltage regulator
INPUT
Over Current
Protection
OUTPUT
Rush Current
Protection
Thermal
Protection
COMMON
2
OUT