Panasonic sb wa 845 ee service manual

Page 1

ORDER NO. MD0506240C3

Service Manual

~__
SB-WA845
Spedficafion
n Active Subwoofer
Type 1 way, 2 speaker system, Bass reflex

Speaker unit(s)
1. Woofer
2. Woofer

Output sound pressure

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

Frequency range

Dimensions (W x H x D)

Mass 11.3 kg
II General
Power consumption 250 W

Power supply AC 230 V, 50Hz

Active Subwoofer System

SB-WA845EE

Colour

(8)... Silver Type

Note :

Specifications are subject to change without notice.
Mass and dimensions are approximate.
n System : SC»HT845(EE) Music Center: SA-HT845(EE)
Satellite Speakers: SB-HT840(GC)
Active Subwoofer: SB»WA845(EE)

SB-HT84OGC-S
Front Speaker
Center Speaker
Surround Speaker

SB-F8842GC-S
SB-PC841GC-S
SB-F3843GC-S

A WARNING

This service information is designed for experienced repair technicians only and is not designed for use by the general public.

it does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service
or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.

CONTENTS

Page

1 Safety Precautions .................................................................. 3
1.1. GENERAL GUIDELINES ................................................ 3

2 Before Repair and Adjustment ----------------------------------------------- 4

3 Protection Circuitry ------------
4 Handling the Lead-free Solder-
4.1. About lead free solder (PbF

Panasonic

Page

5 COnnection of the Speaker Cables ......................................... 5
6 Disassembly Procedure .......................................................... 6
6.1. Disassembly flow chart ................................................... 6

6.2. Disassembly of the Speaker Unit and Checking of the
P.C.B. -

© 2005 Matsushita Electric Industrial Co. Ltd.. All
rights reserved. Unauthorized copying and
distribution is a violation of law.

Page 2

SB-WABSEE

7 Voltage Measurement and Waveform Chart ------------------------- 14
7.1. Voltage Measurement -------------------------------------------------- 14
7.2. Waveform-
8 Block Diagram

9 Notes of Schema c Diagram

10 Schematic Diagram --------------------------------------------------------------- 13
10.1. Power Circuit --------------------------------------------------------------- 18
10.2. Transformer Circuit and AC Inlet Circuit ........................ 20

11 Printed Circuit Board ------------------------------------------------------------ 21

11.1. Power P.C.B. --------------------------------------------------------------- 21
11.2. AC Inlet PCB. and Transformer P,C,B, ------------------------ 23
12 Wiring Connection Diagram .....................

13 Illustration of ICs, Transistors and Diode

14 Parts Location and Replacement Parts List

14.1. Cabinet ------------------------------------------------------------------------ 27
14.2. Electrical Parts List ------------------------------------------------------- 30
14.3. Packing Materials & Accessories Parts List ................... 32

15 Packaging ----------------------------------------------------------------------------- 33