Yamaha MSR400 Service Manual page 27

A
■ BLOCK DIAGRAM
（ブロックダイアグラム）
Q Q
3 7 6 3 1 5 1 5 0
INPUT
LINE OUT
+15V
JK102
1 2 2 3
+
1
3
–
2
LINE/MIC
–15V
IN
IC102A
JK103
1 2 2
3
GND2
T E
L 1 3 9 4 2 2 9 6 5 1 3
JK104
LINE IN (PHONE)
w w w
.
MSR400
B C
MIX
Freq. response
compensation
IC107B
+15V
LEVEL
5 7
+
VR104
–15V
+15V
LOW CUT
IC103B
–15V
IC104A
VR103
POWER
HUM GND GND1
–15V
AC INLET
U,H,B,A,K,T,O
JP102
JP101 SW
J
L(YE)
L101
N(BR)
x a o
y
i
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D E
8
Q111,Q113
COMPRESSOR
HPF
VR105 IC106B
5 7
+
HIGH
IC107A IC109B
EQ
IC108
Q106, LED
Q112 DRIVE
PEAK/
LIMIT
IC104B
LPF
IC105B IC109A
IC105A
IC106A
COMPRESSOR
Q105,Q107
LOW
Q Q
3 7 6 3
EQ
T101
TRANSFORMER
RE
YE(J)
WH(U,T) BK
BK(H,B,K,O)
F101 SW101
BL(A)
RE
GY
OR
WH
OR
u 1 6 3
.
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F G
2 4
9 9 8
AMP
Q243
PEAK DETECT
+Vcc
P.AMP
RY201
+15V
–Vcc
–15V
+Vcc
P.AMP
RY201
–Vcc +V
RY
PEAK DETECT
Q242
1 5 1 5 0 8 9 2 4
DC DETECT Q231
Q230,Q232~234
PROTECTION
+Vcc
D238
–Vcc
IC201
+V RY
+15V
+15V
F201
IC202
D228
~230
–15V –15V
F202
D226 m
c o
H I
MSR400
2
9 9
1
EMI CORE (Korea model only)
YE (+)
TWEETER
BL (–)
2
RE (+)
WOOFER
3
BK (–)
EMI CORE (Korea model only)
9 8 2 9 9
4
5
6
MSR400
1