Block Diagram - Yamaha YST-MS50 Service Manual

BLOCK DIAGRAM

Rch SATELLITE SPEAKER VOLUME
JK4
IL
IR
INPUT 1
JK3
INPUT 2
PWS
OL
+12
–12
JK5
RSP–
1 2
G
3 4 5 OR
TO RIGHT E
SPEAKER
6 7 8
RSP+
POWER
SW2
VOLTAGE
SELECTOR
220V–240V
110V–120V
R model only
YST-MS50
+12
5 7
IC3
VR1 (NJM4556AL)
3 1
Q2 Q1
–12
PWS
+12
+12 E
TO
SUB Wo.
SW1
JK2
(AUTO POWER)
TO LEFT
SPEAKER
Mute
Q3
EQ Amp
+12
–12
IC1,2
IC1
(UPC4570HA)
4 2
H. P. F
12dB/oct
+12
–12
IC1
6 1
H. P. F
12dB/oct
VR2
+12
–12
IC2
7 4
8
BASS
–6dB/oct
POWER
TRANSFORMER
F1
Rectifier
D2
~
F2
~
YST-MS55D
JK1
(HEADPHONE)
OL OR –
TWEETER
RSP– +
–12
1 2
G
3 5
+
4
6 7 8
MIDRENGE
–
RSP+
+B
5
PJ1
LSP+ 8
RSP+ 18
9
PWS1 14
Power Amp. +12
IC6
(STK408-040E)
1
SLI 12
+12
SRI 16
20
+12
–12
IC2
2 SWI
17
3
–12dB/oct
–B
YST-MS55D
+B
(MC24C02-BN6)
Regulator
Regulator
Q201
+3.3V
7
IC2
+B
+
IN OUT
+12
GND
JK202
–
IN OUT
–12
GND
2
IC5
USB
3
INPUT
–B
18
Lch SATELLITE SPEAKER
–
+
PJ2
+
TO
SUB Wo.
–
A. N. I.C
IC7
4 8
–12
SP+
2 7
Q8
IC8
7 2
SP–
–12
IC7,8
8 4
(UPC4570HA)
Q6 Q7
+12 –12
Q4 Q5
EEPROM USB D/A Converter
IC202 IC201
(UDA1321PS)
JK201
5 31 24
WP SDA SDA VOUTL
6 30 21
OUTPUT
SCL SCL VOUTR
TO RIGHT
V
DD V
SS
SPEAKER
L202
14
XTAL1
2 7 6
D–
3 6 7
D+
15
XTAL2
XL201
48MHz
USB IN USE ONLY
YST-MS50/YST-MS55D
TWEETER
MIDRENGE
SUBWOOFER
19