Panasonic SB-WA935

n Active subwoofer
Type 1 way, 2 speaker system, Bass reflex
Speaker unit(s)
1. Woofer 15 cm Cone type
2. Woofer 15 cm 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) 202 x 410 x 500 mm
Mass 13.7 kg
n General
Power consumption 390 W
Power supply AC 230V, 50Hz
1 Safety Precautions
3
1.1. GENERAL GUIDELINES
3
2 Handling the Lead-free Solder
4
2.1. About lead free solder (PbF)
4
3 Before Repair and Adjustment
4
© 2005 Matsushita Electric Industrial Co. Ltd.. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
SB-WA935EE
Colour
(S)... Silver Type
Note :
Specifications are subject to change without notice.
Mass and dimensions are approximate.
n System : SC-HT935(EE)
Music Center: SA-HT935(EE)
Satellite Speakers: SB-HT880(EB)
Active Subwoofer: SB-WA935(EE)
4 Protection Circuitry 4
5 Connection of the Speaker Cables
5
6 Disassembly Procedure
6
6.1. Disassembly flow chart
6
Active Subwoofer System
Specification
CONTENTS
Page Page
ORDER NO. MD0504115C3

Panasonic SB-WA935 Specifications

General

Type	Active
Driver Size	8 inches
Frequency Response	30 Hz - 200 Hz
Inputs	Line in
Outputs	Line out

Summary

Service Manual Introduction

Critical Safety Warning

Crucial warning about servicing by experienced technicians only.

Safety Precautions

General Servicing Guidelines

General advice for servicing, including lead dress and protective device installation.

Leakage Current Testing Procedures

Procedures for both cold and hot checks to prevent shock hazards.

Pre-Repair Procedures and Circuit Protection

Before Repair and Adjustment Steps

Instructions on power disconnection, capacitor discharge, and gradual power restoration.

Protection Circuitry Operation and Reset

Explains when protection circuitry operates and how to reset it.

Disassembly Procedure Overview

Disassembly Flow Chart

Rear Assembly Disassembly Flow Chart

Front Panel Unit Disassembly Illustration

Power Amp Unit Disassembly Procedure

Rear Panel and Fan Unit Disassembly Guide

PCB Disassembly and Component Replacement

AC Inlet and Amplifier PCB Disassembly

Procedure for disassembling and inspecting the AC inlet and amplifier PCBs.

Power and Transformer PCB Disassembly

Procedure for disassembling and inspecting the power and transformer PCBs.

Power ICs and Transistor Replacement

Instructions for replacing power ICs and transistors.

Voltage Measurement Data Tables

Power P.C.B. Voltage Measurements

Amplifier P.C.B. Voltage Measurements

System Block Diagram

Schematic Diagram Notes and Safety Cautions

Component Safety and Replacement Notes

Highlights components with special safety characteristics and replacement parts.

Static Electricity Handling Precautions

Schematic Diagram: Power Circuit

Schematic Diagrams: Transformer and AC Inlet Circuits

Schematic Diagram: Amplifier Circuit

Wiring Connection Diagram