Yamaha MSR250 Service Manual page 38

A B
1 I
BLOCK & LEVEL DIAGRAM （ブロック&レベルダイアグラム）
INPUT
HA Gain
JK102
35dB
IC101 1/2
INPUT
1 2
3
(CH1)
HA
3
[-61~+15dBu] 2
JK101
[-51~+25dBu]
2
10dB down
［入力は全て正相］
3
IC101 2/2
JK301
6
SUM
(L)
INPUT
JK303
(CH2/3)
JK302
[-21~+25dBu]
(R)
4
JK303
5
+20dBu
+10dBu
0dBu
6
-10dBu
LINE [-21dBu]
(CH2~CH3)
-20dBu
Hi-Z (PAD ON) [-21dBu]
(CH1)
-30dBu
Lo-Z (PAD ON) [-31dBu]
(CH1)
-40dBu
Hi-Z (PAD OFF) [-51dBu]
(CH1)
-50dBu
Lo-Z (PAD OFF) [-61dBu]
7 (CH1)
-60dBu
MSR250
C D
CONTROL
IC302 2/2
IC302 1/2
[-26dBu] [-26dBu]
1 1
EQ BA
［正相］
S101 ［逆相］
Normal phase Reverse phase
MIC
LINE
LEVEL
30dB
VR303
(PUSH: LINE)
VR301 VR302
+15V +15V
-15V -15V
IC102 1/2
IC303 2/2
IC303 1/2
[-26dBu] [-26dBu]
[-26dBu]
7 1
2
INV EQ BA
［逆相］ ［正相］ ［逆相］
Reverse phase
Reverse phase Normal phase
LEVEL
VR313
VR311 VR312
E F
[-8dBu]
7
［逆相］
Reverse phase
IC104 2/2 Q108
[-8dBu]
7
SP EQ LIMITER
［正相］
Normal phase
LIMITER
D601
AMP Gain
+8dB
IC304 1/2 IC304 2/2
[-8dBu] [-8dBu]
1
2 5 7
SUM BA
［逆相］ ［正相］
Reverse phase
Normal phase
POWER-a
T801
F802
AC IN
F801
F803
CN810(2P)
POWER SW
Signal levels in blocks and level diagram are indicated under the conditions below.
-50dBu
• Level VR: MAX.
ブロック内のレベル表示及びレベルダイアグラムは、［Level VR: MAX］で表示
-60dBu
G H
AMP
［逆相］
Reverse phase
PA
［逆相］
Reverse phase
+VB -VB
1100(11P) 1101(10P)
CN544(10P) CN543(10P)
+VB -VB
IC104 1/2
2 1
BA SP EQ
［逆相］ ［逆相］
Reverse phase Reverse phase
+15V +15V
POWER
PROTECTION
OVER CURRENT
ON/OFF MUTE
-15V -15V
DC
+VB -VB
MOTHER
+15V
CN541(4P)
-15V
JK404
[0dBu]
［正相］
Normal phase
LINK OUT
CN802(3P)
POWER-b
+15V -15V
FAN
D802-805
D801
+VB
+15
IC801
-15
IC802
R815
-VB
CN803(2P)
SPEAKER OUT
200W/4Ω [+31dBu]
50W/4Ω [+25dBu]
LINK OUT [0dBu]
I J
MSR250
NETWORK
P5
+
HF (TWEETER)
［逆相］
–
P6
Reverse phase
P4
–
LF (WOOFER)
+
［正相］
P3
Normal phase
NETWORK
+40dBu
+30dBu
+20dBu
+10dBu
0dBu
-10dBu
-20dBu
-30dBu
-40dBu
MSR250
3