Yamaha YSP-1100U Service Manual page 67

A B C
INPUT 2/2
1
INPUT (1)
2
3
4
to POWER CABLE
5
AC 3.9
0
2.5
10.4
6
10.4
7
INPUT (3)
8
11.6
2
5
6.7 1
6.6 6.6
3 4 0
11.5
9
0
10
D E F
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 C523 is 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 (5 k-ohms/10 W) between C523 terminals.
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。
・C523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C523の端子間に接続して放電してください。
5 k-ohms
10 W
~
~ ~
~
~ ~
~
~
~
~
~ 15.4
~
~
~ 15.4
~ ~
~ ~
5.0 ~ ~
~
~ ~
~ ~
~
~
~ 4.0
SWITCHING
POWER SUPPLY
~ ~
~
~
~
~
~
~
10.4
3.2
3.3
0
3.1
~ 0.1
~ ~
0.1 0
~ 0
~ 3.1 0
~ ~ 10.4
~ ~ 0.1
~ ~
~ ~ 0
~
0
~ ~ 0
~
3.2
RESET
~
1.0 0
1.2
~ CIRCUIT
0.8
~
0
0.1
0.1
Page 68 C3
to OPERATION (4)_CB301
12.0
11.8
11.8 11.8
11.8 7.1
11.6 11.8
11.5
11.8
6.4
9.8 9.6 8.9
10.9
6 11.6 10.6
7 2
6.1
8
6.1 6.1 1 10.9
6.1
5 6.1 6.1
4 0
3 0
G H
0
5.2
0
4.0
2.5 2.5 10.4
5.2 0
5.2
15.4
15.4
5.2
12.0
12.0 5.1
10.4
12.0 5.1
5.2 15.4 0
0
0
15.4 12.0
15.4 12.0
0
A-1
-24.9
0 -29.4 -29.4 -24.3
4.0 4.0 3.3
4.0 3.2
4.0
0
IC509: NJM78M05FA
IC510, 511: NJM78M12FA
Voltage regulator
(IR OUT)
IC401: NJM2716F
Single supply single high-slew rate operational amplifier
1 5
PIN FUNCTION
1. OUTPUT
2
GND
2.
3. +INPUT
3 4
4. -INPUT
+
5. V
IC402: NJM2717M
Single supply single high-slew rate operational amplifier
1. A OUTPUT
1 8
2. A -INPUT
3. A +INPUT
2 7 4. GND
5. B +INPUT
6. B - INPUT
3 6
7. B OUTPUT
+
8. V
4 5
I J K
Page 64 M4
to AMP (2)_W501
Page 65 L4
to AMP (1)_W701
Page 63 L3
to DSP_W1
POINT A-1
D521 (C)
Page 66 J7
Q504 (C)
to INPUT (2)_W505
AC cable ON
IC501, 503, 504, 512: TLP421
Photo transistor
IC506: AN77L04
Low dropout voltage regulator
Anode 1 4 Collctor
Cathode 2 3 Emitter
IC507: NJM431
Adjustable precision shunt regulator
ANODE A K CATHODE
1
IN
R
REFERENCE
INPUT
IC502: TC4013BP IC505: FA3641N-H1-TE1
Dual D-type flip flop PMW control IC
OUTPUT
RESET1 4
SET1 6
1 Q1 REF 7 5V
5V REF
DATA1 5
2 Q1
CL CL
COMMON
CL
CL
CLOCK1 3
CL
CL
3.0V
10
RESET2
8
SET2 13 Q2 FB 2
DATA2 9
12
Q2
CL
CL
CL
CL
11
CLOCK2 CL
CL
VSS 7
VDD 14
# All voltages are measured with a 10MΩ/V DC electronic volt meter.
# 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.
L M N
YSP-1100
AC cable OFF AC cable ON
Input Short Circuit
Protection
Over Current
Protection
Error Amp.
Rush Current
+ Protection
-
Thermal
Protection
3 2
GND OUT
CS VCC
8 6
0.82V~0.68V 6.5uA 15.5V
VCC +
– 0.9mA
EMB UVL0
15.5V +
+
+ –
–
0.8V
8.5V~7.9V – 16.5V/9V
+ EMB
4V 5 OUT
OUTPUT
–
–
–
PWM
–
Dmax
+
70%
OSC
R
RM RT 4
QB GND
FF
0.24V
+ Q
– S
–
+
1 3
RT IS+
67