Technics-SBWA330-sub-sm 维修电路原理图.pdf
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1、Table Of ContentsCOVER 1 Safety Precautions 1.1 GENERAL GUIDELINES 1.1.1 LEAKAGE CURRENT COLD CHECK 1.1.2 LEAKAGE CURRENT HOT CHECK (See Figure 1.) 2 Handling the Lead-free Solder 2.1 About lead free solder (PbF) 3 Before Repair and Adjustment 4 Protection Circuitry 5 Connection of the Speaker Cable
2、s 6 Disassembly Procedure 6.1 Disassembly of the Speaker Unit 6.2 Main Component Replacement Procedures 6.2.1 Replacement of the Power IC 7 Connection of the Speaker Wiring 8 Block Diagram 9 Schematic Diagram 10 Printed Circuit Board 11 Wiring Connection Diagram RadioFans.CN 收音机爱 好者资料库PV12 Illustrat
3、ion of IC s, Transistors and Diodes 13 Parts Location and Replacement Parts List 13.1 Cabinet 13.1.1 Cabinet Parts Location 13.1.2 Cabinet Parts List 13.2 Component Parts List 13.3 Packing Materials & Accessories Parts List 13.4 Packaging RadioFans.CN 收音机爱 好者资料库Service ManualTOP NEXT ORDER NO. MD030
4、5153C2Active Subwoofer SystemG SB-WA330E SB-WA330EBColour(S).Silver TypeSpecificationActive subwoofer Type1 way, 1 speaker, bass-ref.Speaker unitWoofer17 cm cone type 4 Input power200 W (Music)Output sound pressure level80 dB/ W (1.0 m)Frequency range40 Hz-220 Hz (-16 dB)45 Hz-180 Hz (-10 dB)Dimensi
5、ons (W x H x D)160 x 450 x 424 mmMass11.5 kgGeneral Power supplyAC 230 V, 50 Hz (E)AC 230-240 V, 50 Hz (EB)Power consumption210 WNote : Specifications are subject to change without notice.Mass and dimensions are approximate.System : SC-HT500 (E)Music Center: SA-HT500 (E)Satellite speakers: SB-HT500
6、(E)Active Subwoofer: SB-WA330 (E)System : SC-HT500 (EG)Music Center: SA-HT500 (EG)Satellite speakers: SB-HT500 (E)Active Subwoofer: SB-WA330 (E)System : SC-HT500 (EB)Music Center: SA-HT500 (EB)Satellite speakers: SB-HT500 (E)Active Subwoofer: SB-WA330 (EB)SB-STP1EG-S consists of SB-WA330E-S x1,SB-FS
7、900E-S x 4 and SB-PC52E-S x 1SB-STP1EB-S consists of SB-WA330EB-S x1,SB-FS900E-S x 4 and SB-PC52E-S x 1 2003 PANASONIC AVC Networks Singapore Pte. Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.TOP NEXT 1 Safety PrecautionsTOP PREVIOUS NEXT 1.1 GENERAL GUIDELIN
8、ES 1.1.1 LEAKAGE CURRENT COLD CHECK 1.1.2 LEAKAGE CURRENT HOT CHECK (See Figure 1.) TOP PREVIOUS NEXT 1.1 GENERAL GUIDELINESTOP PREVIOUS NEXT 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.
9、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.1.1.1 LEAKAGE CURRENT COLD CHECK 1.1.2
10、 LEAKAGE CURRENT HOT CHECK (See Figure 1.) TOP PREVIOUS NEXT 1.1.1 LEAKAGE CURRENT COLD CHECKTOP PREVIOUS NEXT 1. Unplug the AC cord and connect a jumper between the two prongs on the plug.2. Measure the resistance value, with an ohmmeter, between the jumpered AC plug and each exposed metallic cabin
11、et part on the equipment such as screwheads, connectors, control shafts, etc. When the exposed metallic part has a return path to the chassis,the reading should be between 1M and 5.2.When the exposed metal does not have a return path to the chassis, the reading must be .Fig. 1 TOP PREVIOUS NEXT 1.1.
12、2 LEAKAGE CURRENT HOT CHECK (See Figure 1.)TOP PREVIOUS NEXT 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 0.15F capacitors, between each exposed metallic part on the set and a good earth g
13、round such as a water pipe, as shown in Figure 1.3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to measure the potential across the resistor.4. Check each exposed metallic part, and measure the voltage at each point.5. Reverse the AC plug in the AC outlet and repeat each of the abo
14、ve measurements.6. The potential at any point should not exceed 0.75 volts RMS. A leakage current tester (Simpson Model 229 or equivalent) may be used to make the hot checks, leakage current must not exceed 1/2 milliamp. In case a measurement is outsideof the limits specified, there is a possibility
15、 of a shock hazard, and the equipment should be repaired and rechecked before it is returned to the customer. TOP PREVIOUS NEXT 2 Handling the Lead-free SolderTOP PREVIOUS NEXT 2.1 About lead free solder (PbF) TOP PREVIOUS NEXT 2.1 About lead free solder (PbF)TOP PREVIOUS NEXT Distinction of PbF P.C
16、.B. : P.C.B.s (manufactured) using lead free solder will have a PbF stamp on the P.C.B.Caution: G Pb free solder has a higher melting point that standard solder; Typically the melting point is 50 - 70F (30 - 40C) higher.Please use a high temperature soldering iron. In case of the soldering iron with
17、 temperaturecontrol, please set it to 700 20F (370 10C).G Pb free solder will tend to splash when heated too high (about 1100F/600C).G When soldering or unsoldering, please completely remove all of the solder on the pins or solder area, and be sure to heat the soldering points with the Pb free solde
18、r until it melts enough.TOP PREVIOUS NEXT 3 Before Repair and AdjustmentTOP PREVIOUS NEXT Disconnect AC power, discharge Power Supply Capacitors C546, C547, C548, C549 through a 10 , 1 W resistor to ground.DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy so
19、lid state devices.After repairs are completed, restore power gradually using a variac, to avoid overcurrent.Current consumption at AC 230V, 50Hz in NO SIGNAL mode should be 400 mA (E).Current consumption at AC 230240V, 50Hz in NO SIGNAL mode should be 400 mA (EB).TOP PREVIOUS NEXT 4 Protection Circu
20、itryTOP PREVIOUS NEXT The protection circuitry may have operated if either of the following conditions are noticed:G No sound is heard when the power is turned on.G Sound stops during a performance.The function of this circuitry is to prevent circuitry damage if, for example, the positive and negati
21、ve speaker connection wires are“shorted”, or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used.If this occurs, follow the procedure outlines below:1. Turn off the power.2. Determine the cause of the problem and correct it.3. Turn on the power once
22、 again after one minute.Note : When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.TOP PREVIOUS NEXT 5 Connection of the Speaker CablesTOP PREVIOUS NEXT G Be sure to connect speaker cables before connecting the AC power supply cor
23、d.G The load impedance of any speaker used with this unit must be 4.G 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. Strip off the outer covering, and twist the center conductor. Make sure the bare ends of the wi
24、res are not unravelled. (If they are, twist them tight again.)2. Insert the wire to the rear panel of the unit and close the lever.Notes :G To prevent damage to circuitry, never short-circuit positive (+) and negative (-) speaker wires.G Be sure to connect only positive (red) wires to positive (+) t
25、erminals and negative (black) wires to negative (-) terminals.6 Disassembly ProcedureTOP PREVIOUS NEXT “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 ci
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