Yamaha Stagepas 300 Service Manual page 49

A B
STAGEPAS 300 BLOCK DIAGRAM
VR
INPUT
CH1: IC102
CH1,2: IC101
CH2: IC202
CH3,4: IC201
CH3: IC302
CH4: IC402
Normal phase
(8P)
B+15
JK102,202
,302,402 Reversed phase
3,5 2
1 2 [ - 26dBu]
8
1,7
[-61/-31dBu] HA 2-Stage EQ
2,6
3
4
CH1-4
R106
LOW
B-15
JK101,201
MIC
Lo: 100Hz
,301,401 R107 (Gain=35dB)
(shelving)
VR101,201
[-51/-21dBu]
LINE
10dBdown
,301,401
(Gain=5dB)
IC501
(8P) IC502
B+15
(8P)
JK501 2 Reversed phase
8 [ - 26dBu]
5 7
BA
2-Stage EQ
L
LOW
Normal phase
VR501
IC501
L
B+15
CH5/6 (8P)
2
3
[-21dBu] 1
BA
2-Stage EQ
R 4
Reversed phase
IC503
B-15
JK502
Normal phase
R IC701
IC702
(8P) B+15
(8P)
2
Reversed phase
8 [-26dBu]
5
7
BA
2-Stage EQ
L
Normal phase LOW
CH7/8 VR701
IC701
(8P)
[-21dBu]
2
3
1
BA 2-Stage EQ
R
4
Reversed phase
IC703
B-15
JK503
(8P)
Normal phase
FILTER
2
I N
【正相】 :Normal phase
【逆相】 :Reversed phase
WARNING
Components having special characteristics are
marked and must be replaced with parts having
specification equal to those originally installed.
+30dBu
+20dBu
+10dBu
0dBu
-10dBu
Hi-Z(PAD ON) [-21dBu]
-20dBu
LINE [-21dBu]
Lo-Z(PAD ON) [-31dBu]
-30dBu
-40dBu
Hi-Z(PAD OFF) [-51dBu]
-50dBu
Lo-Z(PAD OFF) [-61dBu]
-60dBu
MIC [-61dBu]
STAGEPAS 300
C D
（ブロックダイアグラム）
*1
CH1: IC102 VR105
CH1: R124
CH2: IC202 LEVEL
CH2: R224
CH3: IC302
(MASTER)
CH3: R324
CH4: IC402
CH4: R424
(8P)
B+15
Normal phase *2
CH1: R129
8
[-8dBu]
*1 CH2: R229
1 5 7
BA CH3: R329
4 CH4: R429
*2
*3
HIGH B-15
CH1: S102
Hi: 10kHz
*3
LEVEL CH2: S202
(shelving)
CH3: S303
VR102,202 VR103,203
CH4: S402
,302,402 ,303,403
*4
REVERB *4
IC502
B+15 CH1: D101
(8P)
Normal CH2: D201
phase
8 R527 CH3: D301
[ - 8dBu]
1
5 7
CH4: D401
BA
4
IC106
IC203
(8p)
B-15
HIGH (8P)
Normal
VR502 LEVEL
Reversed phase phase B+15
VR503
8 SPEECH (fc:80Hz)
2 1
1
8
R528 SUM HPF
1
5
7 3 2
BA
MUSIC
4
Normal
D102
phase
B-15
IC203 IC106 SPEECH
(8P) IC503
(8P) (8p)
MUSIC
(8P)
SPEECH
IC702
6 7 7
B+15 SUM HPF
(8P)
6
Normal 5
4
phase MUSIC
8
R727
[ - 8dBu]
1
5 7
BA B-15
Reversed S103
4 phase
Normal phase
B-15
HIGH ON side: MUSIC (LED lighting)
LEVEL 【ON側がMUSIC(LED点灯)】
VR702
VR703
B+15
R728
1
5 7
BA
4
Normal
phase
B-15
IC703
VR601
(8P)
R137
REVERB
(CH1-4)
R237
B+5
CN27(8P)
CN28(8P)
B+5
(2/2)
B+15
[-31dBu]
15
B+5
[-11dBu] *5
DIGITAL 6 2
BA
O UT SUM
EFFECT
7 *5
9 IC603 1
CH1: R136 IC603
CH2: R236
IC602 (8P)
(8P)
B-15 CH3: R336
(16p) Reversed phase
Reversed phase
CH4: R436
安全上の注意
印の部品は、安全を維持するために重要な部品です。
交換する場合は、安全のため必ず指定の部品をご使用ください。
SPEAKER [-8dBu]
MONITOR [-8dBu]
EFFECT [-24dBu]
E F
FILTER (1/2)
IC103
IC107
(8P) B+15
(8P)
+B15
8
8 5 7
7 2
LIMITER
BA YSP BA
5 6
4
Normal phase
Normal
phase
B+15
B-15
C933 Reversed phase
B-15
C934
YSProcessing
IC204
IC107 IC204
(8P) B+15
Normal phase
(8P) (8P)
7
5
1
2
BA YSP BA
LIMITER
3 6
4
4 Normal
phase
B-15
B-15
Reversed phase
CN32(8P)
CN31(8P)
5
LIMITER B+15
A
Q601
D601 1
14-12
D602 LEVEL B+15(+15V)
10 4
Meter 5-Point : BA
METER B
B-15(-15V)
+12/+6/0/-6/-20dB
7
8
(0dB:20dBu/MONO IN) D606 IC604
11 IC105 D607
POWER (Over Load: LED flashing) 【過負荷：LEDは点滅】
(8P)
Normal phase B+15
8
3 1
BA
POWERED SP
L (MONO)
MONITOR
OUT
VR104
JK104
[+4dBu]
5
7
BA
POWERED SP
4
R
Normal phase B-15
IC105
JK204
(8P)
L
[-10dBV]
REC OUT
(-8dBu)
R
JK103
B+15
B+15
POWER
C917
ON/OFF
C918
S1
B-15 B-15
INPUT
AC IN
MONITOR OUT [+4dBu]
STAGEPAS 300 BLOCK DIAGRAM
G H
100W/6ohms
x 2
JACK2
POWER
Power Amplifier Unit
CN5(9P)
L
P14
1100(9P)
IC103
Lch
(8P)
L
PA
1 P13
+VB
JK105
-VB
A
AMP MODULE
VBR1
UCD-S200
ERR
(D-AMP)
+VB Rch
-VB AMP MODULE
UCD-S200
VBR2
(D-AMP)
ERR
8
P15
R
PA
1
R
1100(9P)
B
CN7(9P)
P16
+15V
DRIVE
JK205
Q814-823
ERR LED
+5V
B+5(+5V)
C907
REGULATOR
+15V
+15V
-15V
IC801
C909
+15V
REGULATOR
GND (3P)
GND REGULATOR
-15V
+5V
IC803
IC805
+5V (3P)
(3P)
D822
D809
+VB
18V
D810
18V
D812 18V
18V
10 9 8 7 6 10 9 8 7 6
1 3 4 5 T1 1 3 4 5
T2
D808
D806
2
SWITCHING
4 1
CIRCUIT
F1 C804
LINE
JP801
3
FILTER C808
*1
*1
JP801:
J,U,C,V:Mount
28CA1-STAGEPAS300
（ブロックダイアグラム）
I
STAGEPAS 300
JACK1A NETWORK1
or or
JACK1B NETWORK2 1
Speaker HF
(Lch)
P12(P6)
(Lch)
(TWEETER)
NETWORK P11
+
(P5)
L
P10
(P4)
Speaker LF
JK106 P9
(WOOFER)
(JK206)
(P3) +
JACK1B NETWORK2
or
or
JACK1A
NETWORK1
(Rch)
(Rch)
Speaker HF
P6(P12)
NETWORK (TWEETER)
P5
2
(P11) +
R
P4
Speaker LF
(P10)
(WOOFER)
JK206
P3
(JK106)
(P9) +
FAN
R901
-15V
-15V
-VB
FAN
VDR1
D820
D824
D819
Q806 3
VDR2
10V
Q807
D825
10V
PROTECTION
4
+40dBu
SPEAKER 100W [+30dBu]
+30dBu
SPEAKER 20W [+23dBu]
+20dBu
+10dBu
5
0dBu
-10dBu
-20dBu
-30dBu
-40dBu
-50dBu
-60dBu
6