Panasonic SB-WA840 Service Manual
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Panasonic SB-WA840 Service Manual

Panasonic SB-WA840 Service Manual

Active subwoofer system
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Specification
n Active subwoofer
Type
Speaker unit(s)
1. Woofer
2. Woofer
Output sound pressure level
Frequency range
Dimensions (W x H x D)
Mass
n General
Power supply
Power consumption
Power consumption
(Standby mode)
CONTENTS
1 Safety Precautions
1.1. GENERAL GUIDELINES
2 Before Repair and Adjustment
1 way, 2 speaker system, Bass reflex
Impedance 4 Ω
13 cm Cone type
13 cm Cone type
80 dB/W (1.0 m)
40 Hz-220 Hz (-16 dB)
45 Hz-180 Hz (-10 dB)
201.5 x 368.2 x 491.5 mm
AC 230 V, 50Hz
approx. 0.7 W
Active Subwoofer System
SB-WA840EE
Colour
(S)... Silver Type
Note :
Specifications are subject to change without notice.
Mass and dimensions are approximate.
n System : SC-HT840(EE)
11.3 kg
250 W
Page
3
3 Protection Circuitry
3
4 Handling the Lead-free Solder
4
4.1. About lead free solder (PbF)
ORDER NO. MD0503110C3
Music Center : SA-HT840(EE)
Satellite Speakers : SB-HT840(GC)
Active Subwoofer : SB-WA840(EE)
© 2005 Matsushita Electric Industrial Co. Ltd.. All
rights
reserved.
Unauthorized
distribution is a violation of law.
Page
4
4
4
copying
and

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Summary of Contents for Panasonic SB-WA840

  • Page 1 Music Center : SA-HT840(EE) Frequency range 40 Hz-220 Hz (-16 dB) Satellite Speakers : SB-HT840(GC) 45 Hz-180 Hz (-10 dB) Active Subwoofer : SB-WA840(EE) Dimensions (W x H x D) 201.5 x 368.2 x 491.5 mm Mass 11.3 kg n General...

  • Page 2: Table Of Contents

    SB-WA840EE 5 Connection of the Speaker Cables 10.2. Transformer Circuit and AC Inlet Circuit 6 Disassembly Procedure 11 Printed Circuit Board 6.1. Disassembly flow chart 11.1. Power P.C.B. 6.2. Disassembly of the Speaker Unit and Checking of the 11.2. AC Inlet P.C.B. and Transformer P.C.B. P.C.B.

  • Page 3: Sb-Wa840Ee

    SB-WA840EE 1 Safety Precautions 1.1. GENERAL GUIDELINES 1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit. 2. After servicing, ensure that all the protective devices such as insulation barriers, insulation papers shields are properly installed. 3.

  • Page 4: Sb-Wa840Ee

    SB-WA840EE 2 Before Repair and Adjustment Disconnect AC power, discharge Power Supply Capacitors C546~C549 through a 10 Ω, 1 W resistor to ground. DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid state devices. After repairs are completed, restore power gradually using a variac, to avoid overcurrent.

  • Page 5: Connection Of The Speaker Cables

    SB-WA840EE 5 Connection of the Speaker Cables · Be sure to connect speaker cables before connecting the AC power supply cord. · The load impedance of any speaker used with this unit must be 4Ω. · Be sure to connect the cable from the right speaker to the right terminal and the cable from the left speaker to the left terminal. 1.

  • Page 6: Disassembly Procedure

    SB-WA840EE 6 Disassembly Procedure “ATTENTION SERVICER” Some chassis components may have sharp edges. Be careful when disassembling and servicing. 1. This section describes procedures for checking the operation of the major printed circuit boards and replacing the main components. 2. For reassembly after operation checks or replacement, reverse the respective procedures. Special reassembly procedures are described only when required.

  • Page 7: Sb-Wa840Ee

    SB-WA840EE 6.1.2. Disassembly of Rear Assembly...

  • Page 8: Disassembly Of The Speaker Unit And Checking Of The

    SB-WA840EE 6.2. Disassembly of the Speaker Unit and Checking of the P.C.B. 6.2.1. Disassembly of the Front Panel Unit Step 3: Use the screwdriver to slightly lift up the Front Panel Unit as arrow shown. Step 1: Slot in a steel ruler to give a gap between the Front Note: Panel Unit and the Subwoofer Cabinet Assembly as arrow Be careful with the bosses which are glued to the Subwoofer...

  • Page 9: Sb-Wa840Ee

    SB-WA840EE · Assembly of the Front Panel Unit. Step 1: Remove 4 screws from the Woofer 1. Step 1: Clean up all the glue at the 6 Boss points and replace with the normal glue. Step 2: Replace the Front Panel Unit firmly back to the Step 2: Remove the Woofer 1 by detaching the (+) and (-) cabinet.

  • Page 10: Sb-Wa840Ee

    SB-WA840EE 6.2.4. Disassembly of the Power Amp Unit Step 1: Remove 4 screws from the Woofer 2. Step 1: Lay the speaker unit as shown. Remove 6 screws from the bottom of the woofer unit. Step 2: Remove the Woofer 2 by detaching the (+) and (-) wires.

  • Page 11: Sb-Wa840Ee

    SB-WA840EE 6.2.5. Disassembly of the Rear Panel and Fan Unit Follow Step (1) to Step (5) described in section 6.2.4. Step 3: Pull out the Power Amp Unit slightly as shown. Step 1 & 2: Remove 7 screws from the rear panel. Step 4: Disconnect connector CN506.

  • Page 12: Sb-Wa840Ee

    SB-WA840EE Step 5: Lay the rear panel and remove the Fan Unit as arrow shown. 6.2.6. Disassembly and checking of the AC Inlet P.C.B., Power P.C.B. and Step 4 & 5: Remove 6 screws. Transformer P.C.B. Follow Step (1) to Step (5) described in section 6.2.4. Follow Step (1) to Step (3) described in section 6.2.5.
  • Page 13 SB-WA840EE Step 4: Detach the Power IC and Transistor from Heat sink. 6.2.7. Replacement of Power IC and Transistor Follow Step (1) to Step (5) described in section 6.2.4. Follow Step (1) to Step (3) described in section 6.2.5. Step 1: Desolder the Power IC and Transistor terminal. Step 2: Remove 2 screws and Power IC501.

  • Page 14: Voltage Measurement And Waveform Chart

    SB-WA840EE 7 Voltage Measurement and Waveform Chart Note: · Indicated voltage values are the standard values for the unit measured by the DC electronic circuit tester (high-impedance) with the chassis taken as standard. Therefore, there may exist some errors in the voltage values, depending on the internal impedance of the DC circuit tester. ·...

  • Page 15: Block Diagram

    SB-WA840EE 8 Block Diagram IC501 RSN311W64D-P POWER HIC POWER CONTROL CIRCUIT POWER CONTROL/PROTECTION CIRCUIT 12(11) (25) (19) D501 D502 Q506 INTERFACE SWITCH TO MAIN BLOCK Q505 (JK2000) OF SA-HT840EE-S SWITCH SL(R) FILTER JK501(JK502) SURROUND SPEAKER CENTRE FILTER JK502 CENTRE SPEAKER FILTER CN506 SUBWOOFER...

  • Page 16: Notes Of Schematic Diagram

    SB-WA840EE 9 Notes of Schematic Diagram (All schematic diagrams may be modified at any time with the development of the new technology) Note: · The voltage value and waveforms are the reference voltage of this unit measured by DC electronic voltmeter (high impedance) and oscilloscope on the basis of chassis.

  • Page 17: Schematic Diagram

    SB-WA840EE 10 Schematic Diagram 10.1. Power Circuit SCHEMATIC DIAGRAM-1 : -B SIGNAL LINE : MAIN SIGNAL LINE POWER CIRCUIT : +B SIGNAL LINE IC501 IC501 RSN311W64D-P POWER HIC E501 C551 K4CZ01000027 0.01 R513 R501 4.7K R502 C507 18P 4.7K R514 C508 18P R524 120K...
  • Page 18 SB-WA840EE SCHEMATIC DIAGRAM-2 : -B SIGNAL LINE : MAIN SIGNAL LINE POWER CIRCUIT : +B SIGNAL LINE JK501 SRLch FRch L501~L505 G0AR76Y00001 L501 0.7µH FLch L502 0.7µH R621 R622 L505 0.7µH JK502 L503 0.7µH R625 SRRch L504 0.7µH R623 CENTER C569 C518 0.047...

  • Page 19: Transformer Circuit And Ac Inlet Circuit

    SB-WA840EE 10.2. Transformer Circuit and AC Inlet Circuit SCHEMATIC DIAGRAM-3 : -B SIGNAL LINE : +B SIGNAL LINE C555 R589 35V4.7 Q516 R578 B1GACFJJ0018 SYNC SWITCH CN502 D527~D530 R580 B0EAKM000122 PCONT D.GND Q517 POWER CIRCUIT R587 B1BACG000048 2.7K (CP502) ON SYNC VOLTAGE REGULATOR D528...

  • Page 20: Printed Circuit Board

    SB-WA840EE 11 Printed Circuit Board 11.1. Power P.C.B. POWER P.C.B (REPX0473A) CN501 J539 J570 J528 CP502 C550 E500 TO MAIN UNIT J567 R583 D508 J504 J533 C576 D504 C577 Q505 Q506 J512 D558 R521 R581 R522 J521 JK502 C532 CENTRE SPEAKER R537 SURROUND RIGHT...
  • Page 21 SB-WA840EE D562 Q557 Q556 Q552 J567 R583 C570 D508 C580 J504 J533 R582 C576 J586 R606 Q553 Q554 Q555 Q505 Q506 J544 D560 Q501 R558 D555 D558 CN503 D557 Q520 R564 R402 R581 J587 Q502 J588 J509 J553 D518 J628 J631 J554 J632...

  • Page 22: Ac Inlet P.c.b. And Transformer P.c.b

    SB-WA840EE 11.2. AC Inlet P.C.B. and Transformer P.C.B. AC INLET P.C.B (REPX0473A) (BLU) (BRW) 250V 2A FC501 FC502 T502 (BACK-UP TRANSFORMER) Q517 JK500 L500 Q516 J6001 RLY501 C555 R589 R578 J6002 Q519 AC IN C557 230V 50Hz C558 J6003 Q515 J6004 C556 J6007...

  • Page 23: Wiring Connection Diagram

    SB-WA840EE 12 Wiring Connection Diagram CN501 7..1 TO MAIN UNIT CN503 CP502 CENTER SPEAKER JK502 SURROUND RIGHT SPEAKER SURROUND LEFT SPEAKER JK501 FRONT RIGHT SPEAKER CN507 FRONT LEFT SPEAKER SPEAKER WOOFER CN506 SOLDER SIDE POWER P.C.B. H50 0/W500 1 .

  • Page 24: Illustration Of Ics, Transistors And Diodes

    SB-WA840EE 13 Illustration of ICs, Transistors and Diodes B1ACCF000094 RSN311W64D-P B1BACG000048 B1GCCFJJ0016 B1AACF000117 B1BCCG000023 2SD0592ARA B0HARM000017 B0BA5R100013 B1GACFJJ0018 MA2C700A0F B0BA6R600008 Cathode Cathode Cathode Anode Anode Anode B0BA01900005 B0JAPG000019 B0AACK000004 B0EAKM000122 B0BA01100004 B0EAKM000117 B0BA5R600016 Cathode Cathode Anode Anode...

  • Page 25: Parts Location And Replacement Parts List

    SB-WA840EE 14 Parts Location and Replacement Parts List Notes: · Important safety notice: Components identified by mark have special characteristics important for safety. Furthermore, special parts which have purposes of fire-retardant (resistors), high-quality sound (capacitors), low noise (resistors), etc are used. When replacing any of these components, be sure to use only manufacturer’s specified parts shown in the parts list.

  • Page 26: Cabinet

    SB-WA840EE 14.1. Cabinet 14.1.1. Cabinet Parts Location...
  • Page 27 SB-WA840EE...
  • Page 28 SB-WA840EE 14.1.2. Cabinet Parts List Ref. No. Part No. Part Name & Description Remarks CABINET AND CHASSIS RFKHBWA730PP SUB WOOFER CAB ASS’Y XTB3+12GFJ SCREW B3AAA0000583 LED (RED) RGKX0284-H XTB4+12AFJ WOOD SCREW (TBZP) RKAX0019-KJ LEG CUSHION RYQX0167A-S FRONT PANEL UNIT RMQX0106 EVA PACKING (WOOFER) RGNX0277G-S SPEC LABEL...

  • Page 29: Electrical Parts List

    SB-WA840EE 14.2. Electrical Parts List Ref. No. Part No. Part Name & Description Remarks CN507 K1KA02A00008 2P CONNECTOR Ref. No. Part No. Part Name & Description Remarks CP502 K1KA07A00123 7P CONNECTOR PRINTED CIRCUIT BOARD COILS & TRANSFORMERS REPX0473A POWER P.C.B./ AC INLET [M] RTL P.C.B./TRANSFORMER P.C.B.
  • Page 30 SB-WA840EE Ref. No. Part No. Part Name & Description Remarks Ref. No. Part No. Part Name & Description Remarks R509 ERDS2TJ472T 4.7K 1/4W CAPACITORS R510 ERDS2TJ472T 4.7K 1/4W R511 ERDS2TJ153T 15K 1/4W C501 F1D1H102A012 1000P 50V R512 ERDS2TJ153T 15K 1/4W C502 F1D1H102A012 1000P 50V...

  • Page 31: Packing Materials & Accessories Parts List

    SB-WA840EE 14.3. Packing Materials & Accessories Parts List Ref. No. Part No. Part Name & Description Remarks Ref. No. Part No. Part Name & Description Remarks PACKING MATERIALS RPNX0317 POLYFOAM RPFX0071 MIRAMAT BAG 14.4. Packaging FLE0503/J/A/S/E/N...

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