Service manual

ABCDEFGH
1
2
3
4
5
6
IJKLMNO
7
8
9
10
22
Soavo-900SW
* 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。
-2.4
-2.4
5.1
5.0
5.0 5.0
5.0
-1.1
-4.9
-4.9
0
0
0
0
0
2.2
0
0
13.9
13.9
13.9
14.0
56.6
58.3
101.2
101.2
63.8
63.8
63.8
63.8
63.8
63.7
58.3
14.8
50.4
50.4
101.2
101.2
50.4
50.4
14.0
14.0
0
0
0
0
0
0
0
14.8
14.8 14.8
5.1
5.1
-4.9
-4.9 -15.2
0
10.3
10.3
10.2
10.2 10.2
10.2
0
0
0
0
0
0
0
-0.1
-0.1
-0.1 -0.1
50.4
50.4
50.4
50.4
0
0
0
0
0
5.0
5.0
5.0
5.0
0.7
0.1
0.1
0
0
0
0
0
0
0
14.0
-15.2
0
0
0
-0.8
-0.8
-0.8
14.0
14.0
-0.8
0
0
0
0
0
0
0
0
5.1
5.0
4.9
4.9
4.9
5.0
5.0
1.3
1.3
0.7
0.7
5.1
-1.1
14.0
14.0
50.4
50.4
63.7
63.7
63.7
14.8
63.8
56.6
10.3
10.3
10.2
2.2
5.2
2.1
1.3
0
10.3
10.3
10.3
2.2
2.1
1.3
5.2
0
0
0
0
0
0.1
-4.9
-4.8
5.1
5.0
5.0
3.5
1.3
0
3
DC OFFSET ADJUSTMENT
To MAIN (1) W10
Page 21 J-2
To MAIN (1) W11
Page 21 J-2
To MAIN (1) W12
Page 21 K-2
DIGITAL
Point e (Pin 23 of IC101)
I C101 : YDA133-EZE2
Digital Audio Power Amplifier
Controller
PLL
DIGITAL
MODULATION
CIRCUIT
POWER SUPPLY
VOLTAGE
DETECTION
CIRCUIT
MUTE
ERROR
CONTROL
CIRCUIT
GND
CLOCK
PA RT
Operational
amplifer
for integration
24 XO
23 XI
22 MCKIO
20 MSSEL
21 CKOUT
19 HIP
18 HIN
16 PVDD
17 PVSS
15 MUTEN
9 ERRIN
10 ICOUT
PLLC 2
SEL 3
AX1 4
AINM 5
AINP 6
VDD 7
GND 1
VSS 8
DETA2 12
DETB2 14
DETA 11
DETB 13
–
+
Digital modulation part
I C102, 103 : IRS20954STRPBF
Power Drive
16 CSH
15 VB
14 HO
13 VS
12 NC
11 VCC
10 LO
9 COM
7 OCSET
6 VREF
8 DT
VDD 1
IN 3
VSS 4
NC 5
CSD 2
PROTECTION
CONTROL
HV
LEVEL
SHIFT
HV
LEVEL
SHIFT
SD
DT
DEAD-TIME
UV
DETECT
5V REG
HV
LEVEL
SHIFT
HV
LEVEL
SHIFT
HV
LEVEL
SHIFT
UV
DETECT
HIGH
SIDE
CS
UV
Q
FLOATING HIGH SIDE
FLOATING INPUT
UV
DETECT
INPUT
LOGIC
CHARGE/
DISCHARGE
LOW SIDE CS
5.1V REFERENCE
20.8V
20.8V
10.4V
I C109 : NJM2068MD-TE2
Dual OP-Amp
–+
OUT 1
–IN 1
–V CC
+V CC
OUT 2
1
2
3
4
5
+IN 1 –IN 2
+IN 2
– +
6
7
8
SB01-05Q
Anode
Cathode
2SK2158-T2B-A
IRFB38N20DPBF NJM78L05A-T3 IRS20954STRPBFNJM2068MD-TE2
ISS355
RF103L2S
MA111
MA8051-M
YDA133-EZE2 1SR154-400 NJM79L05A-T3
1: IN
2: GND
3: OUT
1: OUT
2: IN
3: GND
8
4
1
5
Anode
Cathode
2SA1037K (Q, R, S)
2SA1514K (R, S)
2SC2412K (Q, R, S)
2SD2657K
DTA114EKA
DTA144EKA
DTC114EKA
G
D
S
C
E
B
G
D
S
16
8
1
9
24
12
1
13
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
 
 
 
 












  
  
Caution: When taking measurement at the following points for
operation check, do not use a voltmeter or the like
which may cause a failure.
Pin 10 of IC102
Pin 14 of IC102
Pin 10 of IC103
Pin 14 of IC103
Gate of Q108
Gate of Q109
Gate of Q110
Gate of Q111
Base of Q125
Emitter of Q125
Base of Q126
Emitter of Q126
Base of Q127
Emitter of Q127
Base of Q128
Emitter of Q128
D115—118
R166—169