Block Diagram - Yamaha YST-SW225 Service Manual

A B
YST-SW225
1
I BLOCK DIAGRAM
+
L
IC1A
3
+ 1
–
–
2
INPUT 1
–
2
R
+
+
L
–
3
OUTPUT
–
R
+
L
4
INPUT 2
R
5
6
7
10
C D
SW7
HIGH CUT FILTER
VR1
PASS PASS
SW1
VOLUME
PHASE
SELECT
ON ON
IC1B IC2A
6 3
IC3B
– –
7 2 5
5 4 + 7
+ +
6
–
L.P.F. L.P.F.
6dB/oct 12dB/oct
HIGH CUT
VR2
8
OFF
4
L
TIMER
R72
IC7
H
6
AUTO STANDBY
7
SW2
MUSIC
+
SENSOR
C39
OFF
IC6
Q9
L
AUTO POWER
H
ON/OFF CIRCUIT
E F
SW3
B.A.S.S.
MOVIE MOVIE
PRE DRIVE
Q13—17
Q20, 21
MUSIC MUSIC
IC4A IC4B IC3A
–
3 5 3
+ 1 + 7 + 1
2 6 2
– – –
+
+
H.P.F. H.P.F.
12dB/oct 12dB/oct
LIMITER
Q5—8
3
Q10, 11
+B
Q18
+15
–15 Q19
–B
Q3
REGULATOR
IC8
STANDBY/ON
D6
D10
SW4
D2 D3
Q4 G R G R
G H
+B
POWER
DRIVE
DRIVER
Q25, 26
PS AMP Q24C, 32
RY1
PS AMP Q24A, 33
–B
A.N.I.C
IC5
IC8
0.1
PROTECTION
Q23, 28, 30, 34
POWER SUPPLY
RY2
D21
F1
SUB
POWER SUPPLY
D1
T1
REGULATOR
Q1, 2
D4
(R, L models only)
I J
POWER
SW5