Service manual

ABCDEFGH
1
2
3
4
5
6
IJKLMN
7
8
9
10
21
Soavo-900SW
■ SCHEMATIC DIAGRAMS
MAIN
* All voltages are measured with a 10M Ω /V DC electronic voltmeter.
* Components having special characteristics are marked Z and
must be replaced with parts having specifications equal to those
originally installed.
* Schematic diagram is subject to change without notice.
* 電圧は、内部抵抗10MΩの電圧計で測定したものです。
* Z印のある部品は、安全性確保部品を示しています。部品の交換が必要な場合、
パーツリストに記載されている部品を使用してください。
* 本回路図は、標準回路図です。改良のため予告なく変更することがございます。
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
00
000.4 0.4
0.6 0.6 0.6 0.8 0.4 0.1 0.1
14.8
14.8
0
0.6 0.6 0.6 0.8 0.4 0.1 0.1
14.8
14.8
0
00
8.3
8.38.38.38.38.38.3
7.7
7.6000
0
0
0
0
0
0
0
0
4.9
4.8
6.5
2.0
2.0
2.0 0.6
2.0 0.6
2.0 0.2
0.8
0.8
6.5 4.9
6.5 4.9
6.5 4.9
0.2
0.2
0.7
1.8 0.2
4.8 4.8
4.9 4.9 4.9 4.9 4.6
0
2.2
2.5
0 0 0
0.1
4.8
4.8
4.9
4.9
4.6
0
0
0
0.1
0.6
0.6
5.5
0.7
0
00
0
0
0
0
0
0
0
0
0.6
0.2
0.2
8.8
0.7
5.5
AC12.3
5.58.8
5.5
11.3
0.4
1.4
1.4 1.4
1.4
0.8
0.8
0.8
0.2
0.2
12.0
14.8
21.1
-22.1
0.1
-22.6
-14.9
3.0
-3.5
14.8
5.5
4.8 0.9 1.0 1.4 8.3 8.3 4.5 4.5 0 0 0 0 0
0
1.4
1.9
1.9
0.8
0.8
0.2
1.8
14.9
0.6
0.6
7.6
0.1
-8.2
-8.2-8.2
0
0
0
0
0
0
0
0
0
0
0
14.8
14.8
14.8
14.8
-14.9
-14.9
-14.9
-14.8
-14.8
AC34.9
AC73.6
0.10.1
0.1
-0.5
-1.1
-1.1
-1.7
-1.7
49.1
49.1
49.6
49.6
0
0
0
0
0
0
-5.1
-14.9
-14.9
-14.9
-5.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
-3.4
-3.4
0
0
0
0
0
0
0
42.749.2
101.2
-22.6
21.3
21.1
14.8
14.8
14.8
14.8
14.8
-15.2 -22.6
1
2
CH2
2
CH1
680
820
820
680
C5099 [Q/P/Y]
5 k-ohms
10W
To DIGITAL CB105
Page 22 K-4
To DIGITAL CB106
Page 22 K-7
To DIGITAL CB101
Page 22 A-5
INPUT 3
(NORMAL)
L/MONO
R
INPUT 2
(LFE)
L
R
INPUT 1/
OUTPUT
L
R
H-CUT
4.7K
VOLUME
STANDBY/ON
s36 C43, 44 0.01/250 4700P/250 4700P/250 4700P/250 4700P/250 4700P/250
s36
s36
POWER
ON/OFF
L2
B-10
47/50
DRIVER
WOOFER
+
–
J, U, C, T, K, A, B, G models
R, L models
VOLTAGE
SELECTOR
(R, L models)
POWER
TRANSFORMER
Point w
CH 1 : Out of IC11
CH 2 : Pin 11 of IC7
↑
AC POWER ON
(Connect the power cable)
↑
AC POWER OFF
(Disconnect the power cable)
↑
AC POWER ON
(Connect the power cable)
Point q (Pin 8 of IC7)
I C1, 2 : NJM4558L
Dual OP-Amp
–IN
1
2
+IN
1
3
–V
CC
4
+IN
2
5
–IN
2
6
OUT
2
7
+V
CC
8
OUT
1
1
–
+
–
+
I C3–5, 12–14 : µPC4570HA-A
Dual OP-Amp
V O1
2
–Vm
1
3
+Vm
1
4
V
EE
5
+Vm
2
6
–Vm
2
7
V
O2
8
V
CC
9
V CC
1
1
– +
– +
2
I C6, 8 : LB1641
Motor Driver
23
P1
5
IN 1
1
GND
4
VZ
6
IN 2
OUT 1
8
VCC 2
10
OUT 2
9
P2
INPUT LOGIC
PRE DRIVER
7
VCC 1
I C9, 10 : TC4052BP
Dual 4 Channel Analog Multiplexers/Demultiplexers
16
VDD
6
INHIBIT
10
A
9
B
8
VSS
7
VEE
12
X0
14
X1
15
X2
11
X3
1
Y0
5
Y1
2
Y2
4
Y3
LEVEL
CONVERTER
BINARY TO 1-OF-4
DECODER WITH INHIBIT
SW
SW
SW
SW
SW
SW
SW
SW
13
X
3
Y
INHIBIT
0
0
0
0
1
B
0
0
1
1
X
A
0
1
0
1
X
0x, 0y
1x, 1y
2x, 2y
3x, 3y
NONE
1SR139
1SS133
MTZJ5.1C
MTZJ8.2C
MTZJ12C
Anode
Cathode
S1NB20RBV2506
+
–
2SA970 (GR, BL)
2SC2240 (GR, BL)
2SC2878 (A, B)
2SC4688 (R, O)DTC114ES
B
C
E
NJM78L05A-T3 NJM4558LNJM79M15FA
TC4052BP
µPC4570HA-A LB1641NJM78M15FA LC651152N-4N21-E
1
9
1
15
30
1
8
1: OUT
2: IN
3: COM
1: OUT
2: COM
3: IN
1: IN
2: GND
3: OUT
1
10
1
8
16
+
–
B
C
E
B
C
E
安全対策
・ この製品の内部には高電圧部分があり危険です。修理の際は、絶縁性の手袋を使用するなどの安全対策を行ってください。
・ MAIN (1) P.C.B. の C77 および C80 には電源 OFF 後も高電圧が維持されるため危険です。
修理前に 5k Ω /10W 程度の抵抗をコンデンサの端子間に接続して強制放電してください。
また、修理後も同様に 5k Ω /10W 程度の抵抗をコンデンサの端子間に接続して強制放電してください。
Safety Measures
• Some internal parts in this product contain high voltages and are dangerous. Be sure to take safety measures during servicing, such
as wearing insulating gloves.
• C77 and C80 on the MAIN (1) P.C.B. are dangerous, for a high voltage is retained there even after the power is turned off.
Before the repair work, connect about 5k-ohm/10W resistor between terminals of the capacitor to forced discharging.
After the repair work, also perform forced discharging by connecting about 5k-ohm/10W resistor between terminals of the capacitor.