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ENGLISH 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 11 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 12