A
B
C
D
E
F
G
H
1
2
3
4
5
6
YST-MS50
(M)
■
BLOCK DIAGRAM
8
9
MAIN ( C ) P. C. B.
TO : MAIN ( D )
VOLUME
(HEADPHONE)
(POWER)
2
1
7
5
8
4
3
6
MAIN ( D ) P. C. B.
TO
SUB W
o
.
INPUT2
INPUT1
R
+
–
+
–
2.2
µ
SPEAKER
(MIDRANGE)
SPEAKER
(TWEETER)
RE
BL
RE
FROM : MAIN ( C )
Q2
Q3
Q8
SW1
PO
WER
SW2
F1
D2
IC4
GND
IN
+
–
OUT
IC5
GND
IN
OUT
~
PO
WER
TRANSFORMER
Regulator
(PO
WER)
Q1
3
5
V
OLUME
VR1
VR2
IR
JK4
INPUT 1
INPUT 2
JK3
Rc
h SA
TELLITE SPEAKER
Lc
h SA
TELLITE SPEAKER
IL
3
1
G
4 7
6
JK2
8
2
5
+12
+12
+12
PWS
TO
SUB W
o
.
T
O
LEFT
SPEAKER
T
O
RIGHT
SPEAKER
OL
1
7
IC3
(NJM4556AL)
OR
RSP
–
RSP+
TWEETER
MIDRENGE
+
+
JK1
(HEADPHONE)
–
–
TWEETER
MIDRENGE
+
+
–
–
SUBW
OOFER
SP+
SP
–
E
–12
3
1
G
4
7
68
2
5
+12
E
OL
PWS
OR
RSP
–
RSP+
JK5
–12
–12
3
5
–12
–12
+12
+12
1
7
H.
P
. F
12dB/oct
H.
P
. F
12dB/oct
–12
+12
–6dB/oct
–12
+12
–12dB/oct
EQ Amp
IC1,2
(NJM4558D)
Mute
P
o
wer Amp.
IC6
(STK408-040E)
IC1
IC2
IC2
IC1
IC7
IC7
(NJM4558D)
+12
–12
2
7
20
1
18
+12
1
6
–12
6
+12
7
–12
3
17
SWI
SRI
SLI
PWS1
RSP+
LSP+
PJ1
TO
SUB W
o
.
PJ2
16
12
14
9
8
5
3
1
+B
–B
–B
+B
B
ASS
Rectifier
Q6
Q7
Q5
Q4
~
A.
N.
I.
C
ON
OFF
■
PRINTED CIRCUIT BOARD (Component side)
▼
Satellite Speaker (R ch)
Ref. No.
Location
IC3
B2
Q1
B2
Q2
B2
●
Semiconductor Location
