Yamaha MCR-330, Service Manual

Page: 54 / 70

★
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.
A
1
2
3
4
5
6
7
8
9
10
B C D E F G H I J K L M N
CRX-330/NS-BP100
54
POWER 1/2
IC1
CB1
CB2 CB3
IC2
IC3
W5
W4
W3
W2
W1
IC11
IC13
IC4
(0)
(319.2)
(318.9)
(317.8)
(318.5)
(0.8)
(454.7)
(0)
0
0
0
0
0
0
15.3
2.5
15.3
3.5
0
0
3.5
14.4 1.0
16.8
12.0
12.0
0
16.8
16.8
0
12.1
0
12.8 0
13.2 1.8
(0)
(0)
(19.4)
(19.4)
-12.6
-27.4
0
-12.2
2.9
2.9 0
0
0
6.9
6.9
3.4
0
0
12.6
6.1
2.7
(0)
(0)
(0)
(318.9)
(1.1)
(19.4)
(0.9)
(3.1)
(5.0)
(0.2)
(1.9)
(2.1)
(1.0)
(3.1)
13.1
(3.1)
(0)
12.1
12.8
(19.3)
(0)
12.8
(0.8)
(0.9)
(318.5)
(454.6)
(133.3)
(133.5)
14.5
14.5
14.5
13.8
1.8
AC24.7
AC6.6
Primary side ground
OSC
PWM COMP DRIVER
STBY
STBY
OUT
INV
GND
VCC
TSD
OCP
Error AMP
SS
CTL
LOGIC
IC11 : BD9870FPS-E2
High stand voltage 1 channel step-down switching regulator
VREF
1
5
FIN
4
2
IC1 : L6566BTR
Multi mode controller for SMPS
MODE SELECTION
&
TURN-ON LOGIC
R
PWM
Q
S
DISABLE
VOLTAGE
REGULATOR
&
ADAPTIVE UVLO
TIME
OUT
UVLO_SHF
UVLO
Internal supply
Vcc
Reference
voltages
Vcc VIn
OCP2
4.5V
Q
6.4V
OVPL
1.5 V
BURST-MODE 5.7V
OVP
UVLO
AC_FAIL
ZERO CURRENT
DETECTOR 50 mV
100 mV
0.450V
0.485V
TIME
OUT
OVPL
14V
IC_LATCH
OFF2
400 uA
OFF2
OVP
-
-
-
+
+
OCP
- + - +
+
+
-
-
+
-
+
-
+
OVERVOLTAGE
PROTECTION
LATCH
SOFT-START
&
FAULT MNGT
LOW CLAMP
& DISABLE
LEB
OSCILLATOR
1
10 14 9 15
7
4
5
6
13
12
11
16
HV
VREF SS AOMP VFF
CS
GD
8
3
GIS
GND
Vcc
FMOD
OSC
MODE/SC
ZCD
AC_OK
3 V
15 uA
DRIVER
15 uA
7.7V
1 mA
Hiccup-mode
OCP logic
LINE VOLTAGE
FEEDFORWARD
IC4 : NJM431U
Adjustable precision shunt regulator
ANODE REFERENCE CATHODE
1 2 3
IC13 : NJM7812FA
Voltage regulator
INPUT
OUTPUT
COMMON
POWER (1)
AC IN
to MAIN (1)_CB209
Page 51 K4
to MAIN (1)_CB205
Page 51 K5
to MAIN (1)_CB216
Page 52 N2
to MAIN (1)_CB206
Page 51 K6
to MAIN (1)_CB210
Page 51 K4