Yamaha R-N500 Service Manual page 77

A B C
OPERATION 3/3
1
2
AC IN
3
S T 5 4 1
C 5 4 0 2
1 0 0 0 P / 2 5 0
C 5 4 0 3
1 0 0 0 P / 2 5 0
4
R 5 4 0 3
1 / 2 P 3 M
C 5 4 0 4
F I 5 4 1
1 2
0 . 2 2 / 2 5 0
5
4 3
E L F 1 7 N 0 1 0 A K
6
7
8
9
10
★ 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.
D E F
M A I N ( 1 )
M A I N ( 1 )
POWER
TRANSFORMER
to POWER TRANSFORMER
- W B 2 2 1 2 0 6 A 1 2 5 V
U C R S W Q 2 1 1 1 0 8 A 1 2 5 V
P R I < - - > S E C
- V V 0 7 1 7 0 T 3 . 1 5 A L 2 5 0 V
K A B G L V V 0 7 1 8 0 T 4 . 0 A L 2 5 0 V
- W M 9 3 3 1 0 T 5 . 0 A L 2 5 0 V
C 5 4 0 5
0 . 0 1 / 2 5 0
C B 5 4 2 C B 5 4 3
R Y 5 4 1
s 5 4 1
D L S 5 D 1 - O ( M ) 0 . 2 5
F 5 4 0 2
W W 8 7 2 0 0
W Y 0 0 1 3 0
D B L 1 5 5 G
N T P A D 5 R 1 L D N B 0 T 5 4 0 1
1
140.0
T H 5 4 1
2
3
D 5 4 0 1
4
5
189.6
R 5 4 0 7
S A R S 0 5 Y D 3 2 5
1 P 4 7
189.2 D 5 4 0 3
C 5 4 1 1
140.1
W S 6 2 0 2 0
s 5 4 5
5 k-ohms
10 W
U C W W 7 6 6 0 0 2 2 0 / 2 2 0
R S W W 7 6 6 1 0 1 5 0 / 4 0 0
K A B G L W Q 8 5 2 5 0 6 8 / 4 0 0
R F 1 0 1 L 2 S
2 2
17.5 R 5 4 0 9 17.5
D 5 4 0 2
8 7 6 5
I C 5 4 1
S T R 2 A 1 5 3
1 2 3 4
16.8
R 5 4 0 8
1.3
1 K
Primary side ground
U C
R K A B G L S
G H
Notes)
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 the capacitors 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, connect a discharging resistor (5 k-ohms/10 W) to the terminals of each capacitor indicated below to discharge electricity.
The time required for discharging is about 30 seconds per each.
C5407 on OPERATION (2) P.C.B
A C - D C C O N V E R T E R
5 4 1 5 6 0
W B 0 8 5 2 0
5 4 0 1 5 6 0 0
H S 5 4 1
5.6
L 5 4 0 1
1 0
5.6
1 . 5 U H
9
8
7
6
U C W Y 6 8 5 5 0 3 3 0 0 / 2 5 0
R K A B G L S W Q 9 0 2 2 0 2 2 0 0 / 2 5 0
5.4
I C 5 4 2
R 5 4 1 3 C 5 4 1 6
4.4 2 2 K
0 . 0 4 7 / 1 6
T L P 7 8 1 ( D 4 - G R )
2.5
D 5 4 0 8
D 5 4 0 5
I C 5 4 4
1 S S 3 5 5 V M 1 S S 3 5 5 V M 1 S S 3 5 5 V M 1 S S 3 5 5 V M
C 5 4 1 2
s 5 4 2
D 5 4 0 6
D 5 4 0 7 T L P 7 8 1 ( D 4 - G R )
W J 3 6 1 2 0 0 . 0 4 7 / 4 0 0
W J 3 6 1 8 0 0 . 0 2 2 / 6 3 0
I J K
IC541: STR2A153
O P E ( 2 )
Switching regulator
VCC 2
FB 4
F G
5 3 2 9 0 - 0 4 8 0
A C _ P W R
D G N D
Page 78
P R Y _ I N
to MAIN (3)_CB281
R 5 4 1 8 D E S T
s 5 4 4
C B 5 4 6
5 3 2 9 0 - 0 8 8 0
5 . 5 V
5 . 5 V
5 . 5 V
5 . 5 V
5.5
Page 78
G N D
0
to MAIN (3)_CB279
G N D
G N D
G N D
C B 5 4 5
OPERATION (2)
L M N
R-N500
5-8
STRATUP D/ST
UVLO REG VREG OVP TSD
DRV
PWM OSC
S Q
R
OCP
Drain Peak current
VCC OLP
Compensation
Feedback
LEB 1 S/OCP
Control
Slope
3 GND
Compensation
IC543: TL431ACLPR
Adjustable precision shunt regulators
CATHODE
REF
Vref
ANODE
L8
L8
77