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Panasonic SB-WA920PP Service Manual

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ORDER NO. MD0403057C1
A6
Active Subwoofer System
SB-WA920PP
Colour
(S)...Silver Type
SPECIFICATIONS
Specification
1

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Summary of Contents for Panasonic SB-WA920PP

  • Page 1 ORDER NO. MD0403057C1 Active Subwoofer System SB-WA920PP Colour (S)...Silver Type SPECIFICATIONS Specification...

  • Page 2: Safety Precautions

    Active subwoofer Type 1 way, 1 speaker system (Bass reflex) Speaker unit Impedance 4 Woofer 20 cm (7-7/8”) Cone type Output sound pressure 84 dB/W (1.0 m) Frequency range 34 Hz-220 Hz (-16 dB) 38 Hz-190 Hz (-10 dB) Dimensions (W x H x D) 285 x 418 x 475 mm (11-7/32”...

  • Page 3: Leakage Current Cold Check

    2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly installed. 3. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards. (This “Safety Precaution”...

  • Page 4: Handling The Lead-Free Solder

    1.1.2. LEAKAGE CURRENT HOT CHECK (See Figure 1.) 1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check. 2. Connect a 1.5k , 10 watts resistor, in parallel with a 0.15 capacitors, between each exposed metallic part on the set and a good earth ground such as a water pipe, as shown in Figure 1.

  • Page 5: Protection Circuitry

    , 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. Current consumption at AC 120V, 60Hz in NO SIGNAL mode should be ~1000 mA . 4.

  • Page 6: Disassembly Procedure

    Notes : - To prevent damage to circuitry, never short-circuit positive (+) and negative (-) speaker wires. - Be sure to connect only positive (Copper) wires to positive (+) terminals and negative (Silver) wires to negative (-) terminals. 6. Disassembly Procedure “ATTENTION SERVICER”...

  • Page 7: Disassembly Flow Chart

    - Disassembly of the Speaker Unit - Main Component Replacement Procedures 6.1. Disassembly flow chart The following chart is the procedure for disassembling the casing and inside parts for internal inspection when carrying out the servicing. To assemble the unit, reverse the steps shown in the chart below. 6.2.
  • Page 8 Step 1: Remove all the screws. Step 2: Remove the stand base. Steps 3 & 4: Remove all the screws from the bottom of the speaker unit. Step 5: Use the Steel Ruler to slot into the hole of the bottom cabinet of speaker.
  • Page 9 Step 6: Use the Wood Chip to slot between the Net Frame and the Steel Ruler as arrow shown. Step 7: Use the Screwdriver slightly lift up the Net Frame as arrow shown. Step 8: Take note of the bosses which glued to the unit . - Assembly of Net Frame.
  • Page 10 Clean up all the glue at the 4 Boss points and replace with the normal glue. Replace the Net Frame firmly back into the cabinet. Step 9: Remove the Net Frame from the cabinet of speaker.
  • Page 11 Step 10: Remove all the screws from the subwoofer. Step 11: Remove the subwoofer by detaching the 2 wires. Step 12: Remove the screws. Step 13: Pull out the Power Amp unit slightly as shown.
  • Page 12 Step 14: Release the connector CN506 then pull out the entire Power Amp unit. Step 15: Remove all the screws. Step 16: Release the connector CN507 to remove the rear panel. Step 17: Remove all the screws. Step 18: Remove all the screws.
  • Page 13 Step 19: Remove all the screws. Step 20: Detach the connector CN503 and remove the transformer. - Checking for the Transformer, Amplifier and AC Inlet P.C.B. Step 21: Place the Transformer P.C.B., Amplifier P.C.B. and the AC Inlet P.C.B. as shown for checking.
  • Page 14 Steps 22: Release the AC Inlet P.C.B. as arrow shown. - Checking for the Power and CD Open P.C.B. Step 23: Place the Power P.C.B. and the CD Open P.C.B. as shown for checking. 6.3. Main Component Replacement Procedures 6.3.1. Replacement of the Power ICs and Transistors Step 1: Desolder the Power IC and Transistor terminals.
  • Page 15 Steps 2 & 3: Remove the screws. Step 4: Replacement of the Power IC601 and Transistors (Q601 & Q602). Steps 5: Desolder the Power IC and Transistor terminals. Steps 6 & 7: Remove the screws.

  • Page 16: Connection Of The Speaker Wiring

    Step 8: Replacement of the Power IC501 and Transistors (Q511 & Q512). 7. Connection of the Speaker Wiring 8. Block Diagram 9. 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...

  • Page 17: Printed Circuit Board

    - Put a conductive mat on the work table. - Ground the soldering iron. - Do not touch the pins of IC, LSI or VLSI with fingers directly. 10. Printed Circuit Board 11. Wiring Connection Diagram 12. Illustration of IC’s, Transistors and Diodes 13.
  • Page 18 otherwise, P= Pico-farads (pF), F= Farads. - Resistance values are in ohms, unless specified otherwise, 1K= 1,000 (OHM). - The marking (RTL) indicates that the Retention Time is limited for this items. After the discontinuation of this assembly in production, the item will continue to be available for a specific period of time.
  • Page 19 13.1.2. Cabinet Parts List...

  • Page 20: Electrical Parts List

    Ref. No. Part No. Part Name & Description Remarks CABINET AND CHASSIS RFKHBWA920PP SUB WOOFER ASS’Y RKA0147-K LEG CUSHION RGKX0255-S STAND ORNAMENT RYQX0136-S FRONT PANEL UNIT RGLX0097-Q LIGHTING CHIP REM0072-3 RGRX0038A-A REAR PANEL RHD30092 SCREW RMC0158-S TR-FIXTURE RMGX0039-KJ TRANS RUBBER RMN0203 PCB HOLDER RMNX0135...
  • Page 21 Ref. No. Part No. Part Name & Description Remarks Q516 KRC102MTA TRANSISTOR Q517 B1BACG000009 TRANSISTOR Q519 KTC3199GRTA TRANSISTOR Q520 B1GCCFJJ0015 TRANSISTOR Q552 B1ACCF000063 TRANSISTOR Q553 2SD0592ARA TRANSISTOR Q554 B1ACCF000063 TRANSISTOR Q555 2SD0592ARA TRANSISTOR Q556 B1ACCF000063 TRANSISTOR Q557 2SD0592ARA TRANSISTOR Q601 B1BACG000009 TRANSISTOR Q602...
  • Page 22 Ref. No. Part No. Part Name & Description Remarks CONNECTORS CN501 K1FB125B0095 SYSTEM CONNECTOR CN502 K1KB07B00020 2P CONNECTOR CN503 RJT119W15V 15P WIRE HOLDER CN506 K1KA03A00006 CONNECTOR CN507 K1KA02A00008 CONNECTOR CN601 RJT119W10V 10P CONNECTOR CN602 RJT119W08V CONNECTOR CN606 K1KA03B00047 CONNECTOR CP502 K1KA07A00123 2P CONNECTOR COILS &...
  • Page 23 H601 K1YF10000006 10P WIRE HOLDER...
  • Page 24 Ref. No. Part No. Part Name & Description Remarks H602 RJS1A5508 WIRE HOLDER H603 K1YF04000001 CABLE HOLDER H604 K1YF04000001 CABLE HOLDER H605 RJS1A5503 CABLE HOLDER JACKS JK500 K2AB2B000002 JK AC INLET JK501 K4BC06B00043 JACK JK601 K4BC04B00080 JK SPEAKER TERMINAL EARTH TERMINALS E500 K4CZ01000027 TERMINAL...
  • Page 25 R529 ERDS2TJ223T 22K 1/4W...
  • Page 26 Ref. No. Part No. Part Name & Description Remarks R530 ERD25FVJ1R0T 1 1/4W R531 ERD25FVJ1R0T 1 1/4W R532 ERDS2TJ472T 4.7K 1/4W R533 ERDS1FVJ100T 10 1/2W R534 ERDS1FVJ100T 10 1/2W R537 ERDS1FVJ100T 10 1/2W R538 ERDS1FVJ100T 10 1/2W R539 ERDS2TJ101T 100 1/4W R540 ERDS2TJ101T 100 1/4W...
  • Page 27 Ref. No. Part No. Part Name & Description Remarks R596 ERDS2TJ473T 47K 1/4W R597 ERDS2TJ103T 10K 1/4W R598 ERDS1FVJ152T 1.5K 1/2W R599 ERDS2TJ223T 22K 1/4W R600 ERDS2TJ473T 47K 1/4W R601 ERDS2TJ473T 47K 1/4W R602 ERDS2TJ472T 4.7K 1/4W R603 ERDS2TJ103T 10K 1/4W R604 ERDS2TJ225T 2.2M 1/4W...
  • Page 28 Ref. No. Part No. Part Name & Description Remarks C516 ECKR2H103ZF5 0.01 500V C517 ECBT1C103NS5 0.01 16V C518 F1D1H473A012 0.047 50V C519 F1D1H473A012 0.047 50V C522 F1D1H473A012 0.047 50V C523 F1D1H473A012 0.047 50V C529 F1D1H1040002 0.1 50V C530 ECBT1H102KB5 1000P 50V C531 ECBT1H102KB5 1000P 50V...

  • Page 29: Packing Materials & Accessories Parts List

    Ref. No. Part No. Part Name & Description Remarks C607 ECBT1H180JC5 18P 50V C608 ECBT1H180JC5 18P 50V C609 ECKR2H103ZF5 0.01 500V C610 ECKR2H103ZF5 0.01 500V C611 ECBT1H102KB5 1000P 50V C612 ECBT1H102KB5 1000P 50V C613 ECKR1H103ZF5 0.01 50V C614 ECKR1H103ZF5 0.01 50V C615 F1D1H473A012 0.047 50V...
  • Page 30 FLE0403/P/A/S/E/N...
  • Page 31 POWER P.C.B. (REPX0436A) J607 CN501 J570 J539 J581 J528 CP502 R543 TO MAIN UNIT E500 R544 Q556 R540 C576 D508 R539 R583 Q513 R605 R566 J504 R542 R541 J533 R606 R607 Q514 C532 D559 R537 R581 J612 JK501 D558 C522 J515 CENTRE J611...
  • Page 32 FP1 5A D562 Q552 CN602 C570 Q557 C580 R582 R558 J586 D560 Q502 D555 J605 Q553 D557 Q520 R564 J587 R402 Q555 Q554 J609 J544 J588 D599 J543 J553 J578 J554 D598 J602 J555 J569 J556 C546 D597 J557 J603 J560 D566 J558...
  • Page 33 CAUTION RISK OF ELECTRIC SHOCK AC VOLTAGE LINE. PLEASE DO NOT AC INLET P.C.B. (REPX0436A) TOUCH THIS P.C.B FC501 FC502 F1 125V 6A T502(SUB TRANSFORMER) JK500 L500 RLY501 J500 J501 Q519 AC IN 120V 60HZ J502 J503 Q515 R500 J527 J526 R580 J540...
  • Page 34 RIC SHOCK NE. PLEASE DO NOT (BLU) (BRW) Q516 RLY501 C555 R589 Q519 R578 C557 J524 Q515 Q517 C571 C556 J527 R580 J522 ED P.C.B. REPX0436A) H505A /W505 RIC SHOCK NE. PLEASE DO NOT...
  • Page 35 SCHEMATIC DIAGRAM-1 : MAIN SIGNAL LINE : -B SIGNAL LINE POWER CIRCUIT : +B SIGNAL LINE IC501 C551 IC501 0.01 RSN311W64B-P POWER HIC E501 K4CZ01000027 R501 R513 4.7K R502 C507 18P 4.7K R514 C508 18P R524 120K D501-D502 R506 B0JAPG000019 R516 R526 C510 22P...
  • Page 36 SCHEMATIC DIAGRAM-2 : MAIN SIGNAL LINE : -B SIGNAL LINE POWER CIRCUIT R597 C564 R594 1200P Q513,Q514 R592 R403 KTC3199GRTA 100K C565 DC DETECT SWITCH Q514 R593 R599 R591 Q513 6.8K 470K R571 C568 R572 C562 0.01 IC502 3.3K 0.01 C0AABB000055 DUAL LOW-NOISE OP AMP JK501...

  • Page 37: Schematic Diagram

    SCHEMATIC DIAGRAM-3 : -B SIGNAL LINE : +B SIGNAL LINE C555 R589 35V4.7 Q516 R578 KRC102MTA SYNC SWITCH CN502 R580 D528 B0EAKM000122 PCONT DGND Q517 POWER CIRCUIT R587 2.7K B1BACG000009 (CP502) ON SYNC D528 VOLTAGE REGULATOR SCHEMATIC SYS6V DIAGRAM-2 C559 HELP 0.01 C556...
  • Page 38 SCHEMATIC DIAGRAM-4 : MAIN SIGNAL LINE : -B SIGNAL LINE AMPILIFIER CIRCUIT : +B SIGNAL LINE IC601 IC601 RSN312H24-P POWER HIC C612 R619 1000P C607 18P R620 C608 18P C611 1000P C610 0.01 C609 0.01 H602 /W602 FAN_DRV R626 INGND POWER ACin CIRCUIT...
  • Page 39 AMPLIFIER P.C.B. SPEAKER WOOFER H602/W602 H601/ W601 8....1 CN606 1...3 SPEAKER H605 INTERFACE P.C.B. /W605 H603A W603 H603B JK601 SURROUND RIGHT /W603 SPEAKER SURROUND LEFT SPEAKER SOLDER SIDE SOLDER SIDE CN501 TO MAIN UNIT CN503 7..1 1.....8 CP502 CN601...
  • Page 40 IC501 RSN311W64B-P POWER HIC POWER CONTROL CIRCUIT POWER CONTROL/PROTECTION CIRCUIT 11(12) TO MAIN (25) (19) BLOCK (JK2000) OF D501 SA-HT920P/PC-S Q506 INTERFACE SWITCH D502 Q505 SWITCHING SL(R) FILTER JK501 SURROUND SPEAKER FILTER JK501 CENTRE SPEAKER FILTER SUBWOOFER FRONTL(R) FILTER JK601 Q602 FRONT VOLTAGE...
  • Page 41 B1GCCFJJ0015 C0AABB000055 RSN311W64B-P RSN312H24-P KTC3199GRTA KRC102MTA B1BACG000009 MA2C700A0F B0FBAM000009 B1ACCF000063 2SD1859QRTV2 B1BCCG000021 2SD0592ARA Cathode Anode B0BA6R600008 B0EAKM000122 B0JAPG000019 SLI325URCT31 B0EAKM000117 B0BA5R100013 B0BA01200008 B0BA5R700008 Cathode B0BA02300017 Cathode B0BA01100004 Cathode Anode B0BA01400009 Anode Cathode Anode Anode B0BA01900005 B0AACK000004...

  • Page 42: Speaker Interface

    AMPLIFIER P.C.B. (REPX0435A) H602/W602 H601 J616 /W601 CN606 R634 J675 J665 D608 D609 H605 D602 /W605 R635 C606 R631 H603A C615 /W603 D601 J678 J699 J696 J627 R624 J644 J686 D604 C616 C608 J619 D605 C619 R620 J700 D603 R633 C611 J642 C612...

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