BBK SP550S Service Manual
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BBK SP550S Service Manual

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ENGLISH
SP550S
Service manual

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Summary of Contents for BBK SP550S

  • Page 1 ENGLISH SP550S Service manual...

  • Page 2: Table Of Contents

    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.

  • Page 3: Sp550S Features

    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.

  • Page 4: Circuit Connection Diagram & Block Diagram

    SP550S SERVICE MANUAL CIRCUIT CONNECTION DIAGRAM & BLOCK DIAGRAM CIRCUIT CONNECTION DIAGRAM POWER AMPLIFYING BOARD ~14V ~14V OUTPUT BOARD INPUT BOARD SW SPEAKER FRONT PANEL'S BOARD BLOCK DIAGRAM MAIN POWER AMPLIFYING BOARD L R SL SR INPUT BOARD POWER AMPLIFICATION L L R SL SR 5.1CH...

  • Page 5: Detailed Circuit Explanations

    SP550S SERVICE MANUAL DETAILED CIRCUIT EXPLANATIONS THE POWER AMPLIFYING BOARD MAIN PARTS LIST OF THE MAIN POWER AMPLIFYING BOARD LOCATION SPECIFICATIONS DESCRIPTION SPECIFICATIONS / PA RT NUMBER R405 Carbon-film Resistor 1/6W680 ¦ ¸ ±5% SHAPED 7.5 R406~R412,R451,R455,R470 Carbon-film Resistor 1/6W1.5K ±5% SHAPED 7.5...
  • Page 6 SP550S SERVICE MANUAL DETAILED CIRCUIT EXPLANATIONS 43 N403 PT2258 DIP 44 N410 TDA7370B M ULTIWATT15V 45 N409 TDA2003 PENTAWATT 46 G401 Crystal Oscillator 4.0MHz 49-U 4MA800-1 48 XS2 ,XS5 Socket 7 PINS 2.5m m 49 XS1 Socket 3 PINS 3.96m m...
  • Page 7 SP550S SERVICE MANUAL DETAILED CIRCUIT EXPLANATIONS SCHEMATIC DIAGRAM OF THE MAIN POWER AMPLIFYING BOARD...
  • Page 8 SP550S SERVICE MANUAL DETAILED CIRCUIT EXPLANATIONS MAIN PARTS LIST OF THE AUXILIARY POWER AMPLIFYING BOARD LOCATION SPECIFICATIONS DESCRIPTION SPECIFICATIONS / PA RT NUMBER R306 Carbon-film Resistor 1/4W4.7K±5% SHAPED 10 R307 Carbon-film Resistor 1/6W56K±5% SHAPED 7.5 R308 Metal Film Resistor 3W20 ¦ ¸ ±5% R-SHAPED 20 x 8...
  • Page 9 SP550S SERVICE MANUAL DETAILED CIRCUIT EXPLANATIONS INPUT BOARD MAIN PARTS LIST OF THE INPUT BOARD MAIN PARTS LIST OF THE INPUT BOARD LOCATION SPECIFICATIONS DESCRIPTION SPECIFICATIONS / PA RT NUMBER 1BSY02-1 Terminal Socket AV6-8.4 - 3C 7P130 2.5T2 6 SHIELDED WITH NEEDLES,...
  • Page 10 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 LOCATION SPECIFICATIONS DESCRIPTION SPECIFICATIONS / PA RT NUMBER C901 Porc elain Capaci tor 50V 104 ±20% 5mm...
  • Page 11 SP550S SERVICE MANUAL DETAILED CIRCUIT EXPLANATIONS 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...

  • Page 12: The Explanation For Key Components

    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 I C control interface...

  • Page 13: Cpu Ic At89C2051

    SP550S SERVICE MANUAL THE EXPLANATION FOR KEY COMPONENTS CPU IC AT89C2051 POWER IC TDA7370B 8-bit microprocessor 4-channel audio amplifier PDIP/SOIC OUT 3 RST/VPP OUT 4 (RX1) P3.0 P1.7 INPUT 3 (TX1) P3.1 P1.6 INPUT 4 XTAL2 P1.5 CLIP DET XTAL1 P1.4...

  • Page 14: Power Ic Tda2003

    SP550S SERVICE MANUAL THE EXPLANATION FOR KEY COMPONENTS POWER IC TDA2003 POWER IC LM1875 Mono audio power amplifier Mono power amplifier SUPPLY VOLTAGE OUTPUT OUTPUT GROUND INVERTING INPUT NON INVERTING INPUT TAB CONNECTED TO PIN.3 Connection Diagram (Front View) Pin connection (Top view)

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