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SP550S
Service manual
SP550S SERVICE MANUAL
CAUTIONS
There is high voltage inside this unit. Make sure to pull out the plug of this unit before
repairing!
There are many high voltage components inside this unit. Please pay attention to all
warnings and instructions marked on this unit to avoid electric shock!
Specifications of the replaced components must be the same as that of the original
components. Do not change the components' specifications to prevent risks!
CONTENTS
CAUTIONS
C ontents
1
SP550S FEATURES
2
CIRCUIT CONNECTION DIAGRAM & BLOCK DIAGRAM
3
DETAILED CIRCUIT EXPLANATIONS
10 THE EXPLANATION FOR KEY COMPONENTS
VOLUME CONTROL IC PT2258
CPU IC AT89C2051
POWER IC TDA7370B
POWER IC TDA2003
POWER IC LM1875
SP550S SERVICE MANUAL
SP550S FEATURES
5.1CH volume and level adjustment incorporate IC PT2258 and realize the standby and mute
functions.
CPU incorporates IC AT89C2051.
Small signal amplification and amplified LPF incorporate IC NJM4558.
Power amplification of L, R, SL and SR channels incorporates power IC TDA7370B.
Power amplification of the C channel employs power IC TDA2003.
Power amplification of the SW channel employs two LM1875 to form BTL.
Status display employs a LED digital tube, displayed range: 0~16.
Full function remote control.
Square power transformer, bridge and full wave rectifying circuit.
Satellite speakers employ plastic body. Subwoofer speaker's body employs xyloid MDF
construction with PVC cover.
Satellite speakers employ 3-foot wide frequency band high performance unit.
Subwoofer incorporates 8-foot aluminum audio coil with dual magnetic circuits exclusively for
the subwoofer unit.
All-in-one flat radiator board with long radiator sluts for excellent heat radiation.
1
SP550S SERVICE MANUAL
CIRCUIT CONNECTION DIAGRAM & BLOCK DIAGRAM
Transformer
CIRCUIT CONNECTION
DIAGRAM
1.~14V
2. 0
3.~14V
POWER AMPLIFYING BOARD
XS1
OUTPUT BOARD
INPUT BOARD
1. SW
2. SR
3. SL
4. C
1. R
2. L
3. GND
XS4
1. GND
2. GND
3. C
4. SR
1. L
2. R
3. SL
XP4
XS2
XS3
SW SPEAKER
1. Vs
2. RM
3. b1+c1
4. a2
5. b2
6. c2
7. d2
8. e2
9. f2
10.g2
11.GND
+
-
1. Vs
2. RM
3. b1+c1
4. a2
5. b2
6. c2
7. d2
8. e2
9. f2
10.g2
11.GND
XP2
1. SW
2. SR
3. SL
4. C
1. R
2. L
3.GND
1. GND
2. GND
3. C
4. SR
1. L
2. R
3. SL
XP3
SW
FRONT PANEL'S BOARD
BLOCK DIAGRAM
L
INPUT BOARD
L
L R SL SR
R
C
SW
5.1CH
INPUT
VOLUME
CONTROL
BUFFER
AMPLIFICATION
MAIN POWER AMPLIFYING BOARD
SR
L R SL SR
POWER
AMPLIFICATION
C
C
SL
SR
C
POWER
AMPLIFICATION
L R SW
SL
R
LPF
SW
AMPLIFICATION
SW
POWER
AMPLIFICATION
OUTPUT BOARD
CPU
LED
REMOTE
CONTROL
RECEPTION
POWER
SUPPLY
DISPLAY
FRONT PANEL'S CONTROL BOARD
2
SP550S SERVICE MANUAL
DETAILED CIRCUIT EXPLANATIONS
1.
THE POWER AMPLIFYING BOARD
MAIN PARTS LIST OF THE MAIN POWER AMPLIFYING BOARD
NO
1
2
3
4
5
6
7
8
9
10
11
12
13
15
16
17
18
19
20
21
22
23
24
25
LOCATION SPECIFICATIONS
R405
R406~R412,R451,R455,R470
R415,R419,R421,R424,R425,R428
R404,R434,R437,R440,R443,R466
R435,R438
R450,R458,R452,R454,R456,R416,R418,
R422,R423,
R426,R427,R441,R444,R459,R465
R446,R467
R432,R433,R439,R442,R447,R448,R464,
R445,R436
R417,R420,R429~R431
R413,R414,R453,R457,R463
R462
R401,R402
R449
R460
R403
R461
C459
C462,C428,C430,C460,C461
C417,C418
C405,C406,C409,C410,C413,C416,C456,
C458
C424,C436
C440,C442,C445
C401,C402
C425,C437
26 C447~C450
27
28
29
30
31
32
33
34
35
36
37
38
C415,C432,C457
C414,C451
C412
C407,C408,C444
C439,C441
C419~C423,C426,C427,C429,C431,C433,
C434,C435,C438,C443
C403,C404,C411
C446,C452~C455
VD412,VD413
VD401~VD406
VD411
VD409,VD410
39 N402
40 N404~N406
DESCRIPTION
Carbon-film Resistor
Carbon-film Resistor
Carbon-film Resistor
Carbon-film Resistor
Carbon-film Resistor
SPECIFICATIONS / PA RT NUMBER
1/6W680¦ ±̧5% SHAPED 7.5
1/6W1.5K±5% SHAPED 7.5
1/6W4.7K±5% SHAPED 7.5
1/6W10K±5% SHAPED 7.5
1/6W12K ±5% SHAPED 7.5
Carbon-film Resistor
1/6W22K±5% SHAPED 7.5
Carbon-film Resistor
1/6W47K±5% SHAPED 7.5
Carbon-film Resistor
1/6W100K±5% SHAPED 7.5
Carbon-film Resistor
Carbon-film Resistor
Carbon-film Resistor
Carbon-film Resistor
Carbon-film Resistor
Carbon-film Resistor
Carbon-film Resistor
Carbon-film Resistor
Porcelain Capaci tor
Porcelain Capaci tor
Porcelain Capaci tor
1/6W150K±5% SHAPED 7.5
1/4W10¦ ±̧5% SHAPED 10
1/6W2.2¦ ±̧5% SHAPED 7.5
1/2W220¦ ±̧5% SHAPED 12.5
1/6W220¦ ±̧5% SHAPED 7.5
1/6W47¦ ±̧5% SHAPED 7.5
1/4W180¦ ±̧5% SHAPED 10
1W220¦ ±̧5£ ¥
50V 33P ±10% NPO 2.5mm
50V 151 ±10% 2.5mm
50V 20P ±10% NPO 2.5mm
Porcelain Capaci tor
50V 104 ±10% 5mm
Terylene Capacitor
Terylene Capacitor
Terylene Capacitor
Terylene Capacitor
Metal Polyester Film
Capacitor
CD
CD
CD
CD
CD
100V 103 ±10% 3.5mm
100V 104 ±10% 7mm
100V 224 ±10% 8mm
100V 182 ±5% 3.5mm
CD
CD11 50V2.2U±20%5×11 2
CD
CD
Diode
Diode
Voltag e Regul ator Diode
Voltag e Regul ator Diode
Software Program CPU,
AT89C2051 DIP
IC
CD11 25V4700U±20%16×35 7.5
CD11 25V220U±20%8×12 3.5
1N4004
RL254
5.1V 1/2W
12V 1/2W
3
CL21X 100V224±10% 7.5
CD11 16V10U±20%5×11 2
CD11 16V47U±20%5×11 2
CD11 16V220U±20%6×12 2.5
CD11 16V470U±20%8×123.5
CD11 25V22U±20%5×11 2
CPUHT60(EN)-0
4558C DIP
SP550S SERVICE MANUAL
DETAILED CIRCUIT EXPLANATIONS
43 N403
44 N410
45 N409
IC
IC
IC
PT2258 DIP
TDA7370B MULTIWATT15V
TDA2003 PENTAWATT
46 G401
Crystal Oscillator
4.0MHz 49-U
47
PCB
4MA800-1
48 XS2 ,XS5
Socket
7 PINS 2.5mm
49 XS1
50 XS3
W1,W3~W8,W11,W14,W17,W18,W20,
51
W23,W28,W27,W19,W24
52 W9,W10,W13,W21,W22,W25,W26
Socket
Socket
3 PINS 3.96mm
12 PINS 2.5mm
Connection Cords
0.6 SHAPED 7.5mm
¦ µ
Connection Cords
53 W2,W12,W15
Connection Cords
0.6 SHAPED 10mm
¦ µ
0.6 SHAPED 12.5mm
¦ µ
54 W16
Connection Cords
55 XP7
Raft Cords
56 XP6
Raft Cords
57 FL401,FL402
Fuse Tube
0.6 SHAPED 15mm
¦ µ
4P300 3.96 1 PLUG
2P90 2.5 1 PLUG WITHNEEDLES,
BLACK 22# CORDS
T4AL 250V
58 FL401,FL402
Fuse Holder
0
4
From Input Board
7PIN
XS2
G
7
L
6
R
5
C
4
SL 3
SR 2
SW 1
150k
22k
C421
2.2u/16V
R422
R429
150k
4.7k
2.2u/16V
C423
R428
R427
22k
22k
R426
4.7k
R425
4.7k
R424
R423
22k
C422
2.2u/16V
150k
4.7k
R421
4.7k
22k
R420
R419
C420
2.2u/16V
R417
R416
R418
22k
R414
10
9
8
7
6
5
4
3
2
1
+5V
OUT3
OUT2
OUT1
OUT6
OUT5
OUT4
GND
REF
Vcc
150k
R431
182N404B
4558
7
C425
PT2258D
IN6
IN5
IN4
SDA
SCL
DGND
2.2/16V
R432
100k
2.2u/16V
C434
2.2u/16V
C433
10u/16V
C432
R436
100k
R439
100k
10k
2.2u/16V
2
3
6
5
12k
C428
151
N405B
4558
7
100k
R448
-12V
N404A
4558
1
+12V
182
C437
-12V
C430
151
R447 2
100k
C436 3
103
+12V
22k
-12V
N406A
4558
1
12k
180
R403
C413 VD411
104 5.1V
+9V
+12V
N405A
4558
1
R435
R438
C460
151
R441
10k
R446
3
2
10k
R437
47k
R445
100k
R440
C412
220u/16V
3
C408
C410
470u/16V 104 -12V
Vout
R434
+12V
C409
470u/16V 104
C407
1
Vs
2
REMOTE
3
b1+c1
4
a2
5
b2
6
c2
To Display Board
7
d2
8
e2
9
f2
10
g2
11
GND
12
g1
11PIN
XS3
N401
7809
Vin
220/0.5W
R433
100k
B+18V
1
C435
2.2u/16V
+9V
2.2u/16V
C431
C429
2.2u/16V
C427
R4701.5k
R412 1.5k
R411 1.5k
R410 1.5k
R409 1.5k
R408 1.5k
R407 1.5k
R406 1.5k
C426
11
12
13
14
15
16
17
18
19
20
+5V
Vs
C411
4700u/25V
R405 680
RL254
VD406
R401
220/0.5W
VD409
12V
VD410
C406
12V
104 A-18V R402
C405
104
C4044700u/25V
VD405
RL254
R466
10k
CODE2 CODE1
IN3
IN2
IN1
N403
AT89C2051
RST/Vpp Vcc
P3.0 P1.7
P3.1 P1.6
XTAL2 P1.5
XTAL1 P1.4
P3.2 P1.3
P3.3 P1.2
P3.4
P1.1
P3.5 P1.0
GND P3.7
20
19
18
17
16
15
14
13
12
11
REMOTEC416
104
N402
R430 6
150k
5
C424
103
10
R413
10
1
2
3
4
5
6
7
8
9
10
T4AL250V
C402
FL402
224
C401T4AL250V
224
C419
2.2u/16V
C418
20p
20p
G401
4M
RESET
C417
R415
4.7k
R404
10k
C415
10u/16V
From Trans.
XS1
1
2
3
3PIN
FL401
A+18V
GND
2
1N4004
VD401~VD404
RL254 C403
4700u/25V
8
1N4004
VD413
4
8
4
220
R449
10k
R442
100k
R443
22k
R465
5
6
C462
151
22k
N406B
4558
R444
C461
151
47k
R467
C414
47u/16V
+5V
7
L
R
C457
100k
R464
1
2.2u/16V
C438
R454
22k
1.5k
R455
-
+
OUT4
OUT3
OUT2
OUT1
-
+
R452
-
+
R451
1.5k
A-18V
N407
LM1875
4
A+18V
22k
A-18V
A+18V
C445
104
C440
104
10
R453
Vs
C442
104
R457
10
R462
2.2
220u/25V
R463
R461
10
220
C446
220u/25V
220u/25V
14
C452
N408
LM1875
4
C459
33p
R456
47
R460
220u/25V
C454
2
220u/25V
15
C453
C455
C456
104
1
C458
104
4
22k
C439
22u/25V
2
1
22u/25V
R450
22k
A+18V
470u/25V
C444
R458 1
22k
2
C441
13
B+18V
N409
TDA2003
2.2u/16V2
R459
22k
C443
N410
TDA7370B
C447
4
IN1
C448
224
SR
5
IN2
C449
224
12
IN3
C450
224
SL
11
IN4
C451
224
6
SVR
47u/16V
10u/16V
7
8
Vcc
SG
9
S-B
PG
5
3
3
Vcc
C.D
10
VD412
4
8
5
3
5
5
3
Vs
7PIN
1
2
3
4
5
6
7
XS5
C
SR
L
R
SL
4PIN
XP7
1
2
To Sub-AMP Board
3 Vs
4 GND
To Sub-AMP Board
GND
SP550S SERVICE MANUAL
DETAILED CIRCUIT EXPLANATIONS
SCHEMATIC DIAGRAM OF THE MAIN POWER AMPLIFYING BOARD
SP550S SERVICE MANUAL
DETAILED CIRCUIT EXPLANATIONS
MAIN PARTS LIST OF THE AUXILIARY POWER AMPLIFYING BOARD
NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
LOCATION SPECIFICATIONS
R306
R307
R308
R301~R305
C301
C302
VD301,VD303,VD304,VD305
VD30 2
V301
V302,V303
Y301~Y303
XP5
XS4
XS8
XS7
DESCRIPTION
Carbon-film Resistor
Carbon-film Resistor
Metal Film Resistor
Carbon-film Resistor
CD
CD
Diode
Voltag e Regul ator Di ode
Triode
Triode
Relay
Raft Cords
Socket
Socket
Socket
PCB
Connection Cords
W1,W2
SPECIFICATIONS / PA RT NUMBER
1/4W4.7K±5% SHAPED 10
1/6W56K±5% SHAPED 7.5
3W20¦ ±̧5% R-SHAPED 20 x 8
1W100¦ ±̧5% R-SHAPED 15 x 8
CD11 25V 330U±20% 8 x 14 3.5
CD11 25V 47U±20% 5 x 11 2
IN4148
6.8V 1/2W
9014C
S8050D
JH4237-012-2H DC 12V
7P 180 2.5 2 PLUGS WITH NEEDLES
7 PINS 2.5 mm
2 PINS 7.92mm
4 PINS 3.96mm
3MA 800-1
¦ µ0.6 SHAPED 7.5 mm
SCHEMATIC DIAGRAM OF THE AUXILIARY POWER AMPLIFYING BOARD
Y303
GSA DC12V
GND
C
SR
From Sub-AMP Board
L
R
SL
XP5
1
2
3
4
5
6
7
7PIN
VD305
1N4148
Y302
GSA DC12V
R301 R302 R303 R304 R305
100
100
100 100 100
XS4
1 GND
2
3
C
4 SR
5
L
6
R
7 SL
7PIN
VD304
To Output Board
1N4148
Y301
GSA DC12V
From Sub-AMP Board
XS7
1
2
Vs
3
GND 4
4PIN
C301
330u/25V
XS8
1
2
3
3PIN
V302
S8050
R308
20/2W
R306
4.7k
To SW Speaker
VD303
R307
56k
VD301
1N4148
V301
9014
1N4148
VD302
6.8V
C302
47u/25V
V303
S8050
XP6
1
2
GND
XJ4
XJ6
2PIN
NOTE:
When repairing the power amplifying board, make sure that the IC is fixed to the big radiator board closely
and rightly without any inclination in assembling the Power IC N407, N408, N409 and N410. A silicon oiled
mica spacer needs to be placed between the IC and the big radiator board. When fixing the screws of the
Power IC N407, N408, N409 and N410, the insulating spacers need to be placed between the screws and
the Power IC. A multimeter can be used to detect whether the insulation is effective or not. Otherwise, a
short circuit may be resulted to burn out the Ics.
6
SP550S SERVICE MANUAL
DETAILED CIRCUIT EXPLANATIONS
2.
INPUT BOARD
MAIN PARTS LIST OF THE INPUT BOARD
MAIN PARTS LIST OF THE INPUT BOARD
NO.
LOCATION SPECIFICATIONS
DESCRIPTION
SPECIFICATIONS / PA RT NUMBER
1
PCB
1BSY02-1
2 XC1
Terminal Socket AV6-8.4 - 3C
7P130 2.5T2 6 SHIELDED WITH NEEDLES,
3 XP2
Raft Cords
PIN7 GROUNDED
SCHEMATIC DIAGRAM OF THE INPUT BOARD
L
R
XP2
7
6
5
4
3
2
1
C
Signal Source
SL
7PIN
SR
SW
7
To Power AMP Board
SP550S SERVICE MANUAL
DETAILED CIRCUIT EXPLANATIONS
FRONT PANEL'S CONTROL BOARD
MAIN PARTS LIST OF THE FRONT PANEL'S CONTROL BOARD
MAIN PARTS LIST OF THE FRONT PANEL'S CONTROL BOARD
NO.
1
2
LOCATION SPECIFICATIONS
DESCRIPTION
SPECIFICATIONS / PA RT NUMBER
C901
Porc elain Capaci tor 50V 104 ±20% 5mm
C901
Stone Capaci tor
50V 104 ±20% 5mm
C901
Chip Capacitor
50V 104 ±20% 0805
DS901
LED Digital Tube
E20361-G
PCB
9BSY02-3
3
4
XP3
Raft Cords
12P300 2.5 1 PLUG
5
N901
Infrared Receptor
HS0038B
6
Affix N90 1
Soft Sponge P ad
10×10×1 DOUBLE HARD SIDED
SCHEMATIC DIAGRAM OF THE FRONT PANEL'S CONTROL BOARD
J?
LED4
+5V
COMMON ANODE
6
N901
HS0038B
1
2
14 3 1110 8 7 5 12 9 13
b1
c1
a2
b2
c2
d2
e2
f2
g2
g1
3
REMOTE
Vs
C901
104
XP3
1
2
3
4
5
6
7
8
9
10
11
12
3.
8
12PIN
SP550S SERVICE MANUAL
DETAILED CIRCUIT EXPLANATIONS
4.
POWER SWITCH BOARD
MAIN PARTS LIST OF THE POWER SWITCH AND POWER IC OF THE AMP BOARD
MAIN PARTS LIST O F THE PO WER SWITCH AN D PO WER IC OF THE AMP BO ARD
NO.
DESCRIPTION
SPECIFICATIONS/PART NUMBER
LOCATION SPECIFICATIONS
1
Porcelain Capacitor
CT7 400V 103 ±20% 10mm
2
Power S witch
PS8-11 2#
3
Mains Cords
2P1.9m10A STC-999(MX)
4
Fuse Tube
T1.6AL 250V
FUS E TUBE HOLDER
5
Mica S pacer
24×22×0.1
N410
Mica S pacer
22×20×0.1
N410
6
7
8
Insulation Cannular ¦
Pyrocondensation
¦
Cannular
Mica S pacer
PO WER S WITC H
µ3×6×3
N407~N410
µ25
PO WER S WITC H
18×13×0.1
N407,N408,N409
SCHEMATIC DIAGRAM OF THE POWER SWITCH BOARD
L
~220V
50Hz
N
E
FL
L250V
T1.6A
SW 6A/250V
TRANS
~14V
C
~14V
0.01u/400V
TK6301500
9
XP1
1
To AMP Bo ard
2
3
3.96
3PIN
SP550S SERVICE MANUAL
THE EXPLANATION FOR KEY COMPONENTS
VOLUME CONTROL IC PT2258
Manufactured by CMOS technology,6-channel volume control IC.I2 C control interface
Features:
6-channel design, each channel 0-79 dB 1dB/STEP
Working voltage:+5~8v
Audio channel separability: 100dB
I2C control interface
DIP package
1N1
1dB/Step
OUT1
10dB/Step
Ref
10dB/Step
OUT2
1N2
1dB/Step
1N3
1dB/Step
OUT3
10dB/Step
Ref
10dB/Step
OUT4
1N4
1dB/Step
1N5
1dB/Step
OUT5
10dB/Step
Ref
10dB/Step
1N6
OUT6
1dB/Step
CODE1
CODE2
VCC
DGND
SDA
REF
Ref
Control unit
SCL
GND
10
SP550S SERVICE MANUAL
THE EXPLANATION FOR KEY COMPONENTS
CPU IC AT89C2051
POWER IC TDA7370B
8-bit microprocessor
4-channel audio amplifier
PDIP/SOIC
RST/VPP
1
20
VCC
(RX1) P3.0
2
19
P1.7
(TX1) P3.1
3
18
P1.6
XTAL2
4
17
P1.5
XTAL1
5
16
P1.4
(INT0) P3.2
6
15
P1.3
(INT1) P3.3
7
14
P1.2
(T0) P3.4
8
13
P1.1 (AIN1)
(T1) P3.5
9
12
P1.0 (AIN0)
GND
10
11
P3.7
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
OUT 3
OUT 4
VCC
INPUT 3
INPUT 4
CLIP DET
S-GND
PW-GND
STAND-BY
SUR
INPUT 2
INPUT 1
VCC
OUT 2
OUT 1
Pin connection (Top view)
Pin structure
Features:
Voltage:+2~+6v
Features:
Max.+6.6v
Voltage:+18V Max.+28V
Max. I/O current:20mA
I/O numbers:15
Max. peak current:3.5A
Output Power(Vs=14.4V Rl=4 ohm,THD=10%,f=1kHz
RAM:128 bits
6.5w*4
Full protection function
FLASH EEPROM:2K
Max. work efficiency :24 MHz
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SP550S SERVICE MANUAL
THE EXPLANATION FOR KEY COMPONENTS
POWER IC TDA2003
POWER IC LM1875
Mono audio power amplifier
Mono power amplifier
5
4
3
2
1
GND
SUPPLY VOLTAGE
5
4
3
2
1
OUTPUT
GROUND
INVERTING INPUT
NON INVERTING INPUT
VCC
OUTPUT
-VEE
-IN
+IN
TAB CONNECTED TO PIN.3
Connection Diagram (Front View)
Pin connection (Top view)
Features:
Features:
Voltage:+18v,Max.+28v
Voltage: 8V~30V
Max. output current:4A
Output Power:(Vcc=+25v, VEE=-25v, Rl=8ohm
THD=1%,f=1kHz):25w
Max. output peak current:3.5A
Output power(Vs=14.4v,RL=4 ohm,THD=10%,f=1kHz):6w
Full protection function
Full protection function
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