Panasonic SBWA845EE free download

File name Panasonic-SBWA845EE actsub.pdf

ORDER NO. MD0506240C3 Active Subwoofer System SB-WA845EE Colour (S)... Silver Type Specification n Active subwoofer Type Speaker unit(s) 1. Woofer 2. Woofer Output sound pressure Frequency range Dimensions (W x H x D) Mass n General Power consumption Power supply 250 W AC 230 V, 50Hz 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 11.3 kg n System : SC-HT845(EE) Music Center: SA-HT845(EE) Satellite Speakers: SB-HT840(GC) Active Subwoofer: SB-WA845(EE) 1 way, 2 speaker system, Bass reflex Note : Specifications are subject to change without notice. Mass and dimensions are approximate. CONTENTS Page 1 Safety Precautions 1.1. GENERAL GUIDELINES 2 Before Repair and Adjustment 3 Protection Circuitry 4 Handling the Lead-free Solder 4.1. About lead free solder (PbF) 3 3 4 4 4 4 © 2005 Matsushita Electric Industrial Co. Ltd.. All rights reserved. Unauthorized copying and distribution is a violation of law. 5 Connection of the Speaker Cables 6 Disassembly Procedure 6.1. Disassembly flow chart 6.2. Disassembly of the Speaker Unit and Checking of the P.C.B. 8 Page 5 6 6 SB-WA845EE 7 Voltage Measurement and Waveform Chart 7.1. Voltage Measurement 7.2. Waveform 8 Block Diagram 9 Notes of Schematic Diagram 10 Schematic Diagram 10.1. Power Circuit 10.2. Transformer Circuit and AC Inlet Circuit 11 Printed Circuit Board 14 14 15 16 17 18 18 20 21 11.1. Power P.C.B. 11.2. AC Inlet P.C.B. and Transformer P.C.B. 12 Wiring Connection Diagram 13 Illustration of ICs, Transistors and Diodes 14 Parts Location and Replacement Parts List 14.1. Cabinet 14.2. Electrical Parts List 14.3. Packing Materials & Accessories Parts List 15 Packaging 21 23 24 25 26 27 30 32 33 2 SB-WA845EE 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. After servicing, check for leakage current to prevent from being exposed to shock hazards. 1.1.1. LEAKAGE CURRENT COLD CHECK 1. Unplug the AC cord and connect a jumper between the two prongs on the plug. 2. Using an ohmmeter measure the resistance value, between the jumpered AC plug and each exposed metallic cabinet 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 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 0.15µF capacitors, between each exposed metallic part on the set and a good earth g