Panasonic SB-WA840 User Manual

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

Panasonic SB-WA840 Specifications

General

Brand	Panasonic
Model	SB-WA840
Category	Subwoofer
Language	English

Summary

Service Safety Precautions

General Servicing Guidelines

General guidelines for safe servicing, emphasizing lead dress and protective device installation.

Leakage Current Cold Check Procedure

Procedure for performing a cold leakage current check using an ohmmeter.

Leakage Current Hot Check Procedure

Procedure for performing a hot leakage current check using an AC voltmeter and specific circuit.

Pre-Repair Procedures

Unit Protection Circuitry

Speaker Cable Connection

Unit Disassembly Guide

Disassembly Flow Chart

Front Panel Assembly Disassembly

Rear Assembly Disassembly

Speaker Unit Disassembly and PCB Check

Procedure for disassembling speaker units and checking associated PCBs.

Woofer 1 Disassembly

Woofer 2 Disassembly

Power Amp Unit Disassembly

Step-by-step guide for removing the power amplifier unit.

Rear Panel and Fan Unit Disassembly

AC Inlet, Power, and Transformer PCB Disassembly

Steps for disassembling and checking key printed circuit boards.

Power IC and Transistor Replacement

Procedures for desoldering and replacing the power IC and transistors.

Troubleshooting: Voltage and Waveform Analysis

Voltage Measurement Reference

Table of standard voltage readings at various test points for diagnosis.

Waveform Chart Reference

Schematic Diagrams

Power Circuit Schematic

Transformer and AC Inlet Circuit Schematics

Printed Circuit Board Layouts

Power P.C.B. Layout

AC Inlet and Transformer P.C.B. Layouts

Wiring Diagram

Parts List and Location