SA-WM%20250.pdf

SA-WM250

SERVICE MANUAL

US Model

Canadian Model

AEP Model

UK Model

E Model

Ver 1.0 2004.03

SPECIFICATIONS

AUDIO POWER SPECIFICATIONS

POWER OUTPUT AND TOTAL HARMONIC

DISTORTION:

With 6 ohm loads, from 28 – 200 Hz; rated 100 watts,

minimum RMS power, with no more than 0.8 % total

harmonic distortion from 250 milliwatts to rated

output.

Inputs

Input jacks

INPUT: input pin jack

SPEAKER IN: input terminals

Output jacks

SPEAKER OUT: output terminals

General

Power requirements

Taiwan models: 110 V AC, 50 Hz

USA and Canada models: 120 V AC, 60 Hz

Other models: 230 V AC, 50/60 Hz

System

Type Active Subwoofer (magnetically shielded design)

Speaker unit Woofer: 20 cm dia. (8 in.), cone type

RMS output 100 W (6 Ohms, 40 Hz, 10% THD)

Frequency range 28 Hz – 200 Hz

High frequency cut-off frequency

50 Hz – 200 Hz

Power consumption

100 W

Dimensions

Approx. 290 × 355 × 387 mm

(11 3/8 × 14 × 15 1/4 in.) (w/h/d)

Mass

11.5 kg (25 lb 6 oz)

Supplied accessories

Foot pads (4)

Audio connecting cord (1 phono – 1 phono),

2 m (6 ft 6 1/2 in.) (1)

Speaker cords, 2.5 m (8 ft 2 1/2 in.) (2)

Phase selector

NORMAL, REVERSE

Design and specifications are subject to change without notice.

ACTIVE SUBWOOFER

9-877-696-01

2004C04-1

Sony Corporation

Home Audio Company

Published by Sony Engineering Corporation

SA-WM250

SAFETY CHECK-OUT

After correcting the original service problem, perform the follow-

ing safety check before releasing the set to the customer:

Check the antenna terminals, metal trim, “metallized” knobs, screws,

and all other exposed metal parts for AC leakage.

Check leakage as described below.

TABLE OF CONTENTS

1. GENERAL

Location of Controls ................................................................ 3

2. DIAGRAMS

2-1. Note for Printed Wiring Boards and

Schematic Diagrams ............................................................ 3

2-2. Circuit Boards Location ...................................................... 3

2-3. Printed Wiring Boards – Main Section – ............................ 4

2-4. Printed Wiring Board – Input Control Section – ................. 5

2-5. Printed Wiring Boards – Power Section – ........................... 6

2-6. Schematic Diagram – Main Section – ................................. 7

2-7. IC Block Diagram ............................................................... 8

LEAKAGE TEST

The AC leakage from any exposed metal part to earth ground and

from all exposed metal parts to any exposed metal part having a

return to chassis, must not exceed 0.5 mA (500 microampers.).

Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA

WT-540A. Follow the manufacturers’ instructions to use these

instruments.

2. A battery-operated AC milliammeter. The Data Precision 245

digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a

VOM or battery-operated AC voltmeter. The “limit” indica-

tion is 0.75 V, so analog meters must have an accurate low-

voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-

amples of a passive VOM that is suitable. Nearly all battery

operated digital multimeters that have a 2 V AC range are suit-

able. (See Fig. A)

3. EXPLODED VIEWS

3-1. Main Section ....................................................................... 9

4. ELECTRICAL PARTS LIST ......................................... 10

To Exposed Metal

Parts on Set

0.15 µ F

1.5 k Ω

voltmeter

(0.75 V)

• UNLEADED SOLDER

Boards requiring use of unleaded solder are printed with the lead-

free mark (LF) indicating the solder contains no lead.

(Caution: Some printed circuit boards may not come printed with

the lead free mark due to their particular size.)

Earth Ground

: LEAD FREE MARK

Unleaded solder has the following characteristics.

• Unleaded solder melts at a temperature about 40°C higher than

ordinary solder.

Ordinary soldering irons can be used but the iron tip has to be

applied to the solder joint for a slightly longer time.

Soldering irons using a temperature regulator should be set to

about 350°C.

Caution: The printed pattern (copper foil) may peel away if

the heated tip is applied for too long, so be careful!

• Strong viscosity

Unleaded solder is more viscous (sticky, less prone to flow)

than ordinary solder so use caution not to let solder bridges

occur such as on IC pins, etc.

• Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may

also be added to ordinary solder.

(Fig. A)

SAFETY-RELATED COMPONENT WARNING!!

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE

WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN

THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.

REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE

PA RT NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR

IN SUPPLEMENTS PUBLISHED BY SONY.

LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 SUR LES

DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT

CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE

REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY

DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU

DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

SA-WM250

SECTION 1

GENERAL

This section is extracted

from instruction manual.

SECTION 2

DIAGRAMS

LOCATION OF CONTROL

2-1. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

THIS NOTE IS COMMON FOR PRINTED WIRING

BOARDS AND SCHEMATIC DIAGRAMS.

(In addition to this, the necessary note is printed

in each block.)

Amplifier

SPEAKER

INPUT

This subwoofer

SPEAKER B

SPEAKER A

INPUT

For schematic diagrams.

Note:

• All capacitors are in µ F unless otherwise noted. pF: µµ F

50 WV or less are not indicated except for electrolytics

and tantalums.

• All resistors are in Ω and 1 / 4 W or less unless otherwise

specified.

• f : internal component.

• C : panel designation.

For printed wiring boards.

Note:

• X : parts extracted from the component side.

• Y : parts extracted from the conductor side.

• : Pattern from the side which enables seeing.

•Abbreviation

CND : Canadian model.

MY : Malaysia model.

OUT

SPEAKER

OUT

SPEAKER IN

SPEAKER

OUT

Front Speaker (R)

Front Speaker (L)

OUT

SPEAKER

Front Speaker (R)

Front Speaker (L)

SPEAKER

This subwoofer

Amplifier

This subwoofer

POWER indicator

120Hz 150Hz

100Hz

MONO OUT

: Singapore model.

PHASE

INPUT

NORMAL

REVERSE

PHASE

2 1

200Hz

CUT OFF FREQ

200Hz

50Hz

Note:

The components identi-

fied by mark 0 or dotted

line with mark 0 are criti-

cal for safety.

Replace only with part

number specified.

Note:

Les composants identifiés par

une marque 0 sont critiques

pour la sécurité.

Ne les remplacer que par une

piéce portant le numéro

spécifié.

75Hz

Foot pads

POWER

50Hz

CUT OFF FREQ

LEVEL

MAX

MIN

OUT

LEVEL

Precautions

Hooking Up the System

Overview

Use the INPUT jacks or the SPEAKER IN terminals of the

subwoofer when you connect the amplifier.

• If your amplifier has one of the following types of

output jacks, connect the INPUT jack and the

amplifier's jack using the supplied audio connecting

cord.

— MONO OUT jack

—MIX OUT jack

— SUBWOOFER output jack(s)

— SUPER WOOFER output jack(s)

• If your amplifier does not have the above mentioned

output jacks, connect the speaker terminals of the

amplifier to the SPEAKER IN terminals instead. ( A )

Before you get started

• Turn off the power of the amplifier and the subwoofer

before making any connection.

• Use the audio connecting cords that are supplied to

the respective equipment. If there are not enough

audio connecting cords to make the necessary

connections, you need to purchase some optional

audio connecting cords.

• Be sure to make connections firmly to avoid noise.

• Connect the AC power cord from the subwoofer to

a wall outlet.

• You cannot connect the CENTER output jack for use

with Dolby Pro Logic function to the subwoofer.

Bass sound is not output with some Dolby Pro Logic

modes.

Connecting to an amplifier with a

special jack for a subwoofer

If your amplifier has a special jack for a subwoofer (such

as MONO OUT jack, MIX OUT jack, SUBWOOFER jack

or SUPER WOOFER jack), connect the INPUT jack of the

subwoofer to one of those jacks.

Hookups ( D )

Connect the MONO OUT jack of your amplifier to the

INPUT jack of the subwoofer with the supplied audio

connecting cord.

Note

If the output level of your amplifier is not large enough,

the sound may not be loud enough. In this case, connect

the speaker terminals of the amplifier directly to the

SPEAKER IN terminals of the subwoofer.

Connecting the AC power cord

• Connect the AC power cord from the subwoofer and

from your amplifier to a wall outlet.

• Make sure that power to the subwoofer is turned off

before you plug in or unplug any power cord.

Adjusting the Sound ( F )

You can adjust the sound of the subwoofer to suit the

sound of your front speakers. Reinforcing the bass sound

gives you a greater sense of atmosphere.

1 Adjust the cut-off frequency.

Turn the CUT OFF FREQ control, depending

on the reproduction frequencies of your front

speakers.

Refer to the following when adjusting.

1 Typical very small sized speakers: 5 – 7 cm

dia.

2 Typical small sized speakers: 8 –15 cm dia.

3 Typical medium sized speakers: 16 –24 cm

dia.

4 Typical large sized speakers: more than 25

cm dia.

To make the most of the low level converter

function of Dolby digital, turn the CUT OFF

FREQ as high as possible when playing back

the Dolby digital.

2 Adjust the volume level of the subwoofer.

Turn the LEVEL control so that you can hear

the bass sound a little more than before. To

increase the volume, turn the LEVEL control

clockwise. To reduce the volume, turn the

LEVEL control counterclockwise.

3 Play your favorite song and movie.

Male vocal tunes and voice containing bass

sounds are most suitable for adjustment.

Turn the volume for front speakers to the

same level as usual.

4 Select the phase polarity.

Use the PHASE selector to select the phase

polarity.

5 Repeat steps 1 to 4 to adjust for your

preference.

Once you have adjusted the subwoofer to the

settings you want, use the VOLUME control

on the amplifier to adjust the volume of the

subwoofer with that of the other speakers.

You don’t need to adjust the subwoofer

settings when you change the volume level

of the amplifier.

• A : B+ Line.

• B : B– Line.

•Voltages are dc with respect to ground under no-signal

(detuned) conditions.

no mark : Power on

•Voltages are taken with a VOM (Input impedance 10 M Ω ).

Voltage variations may be noted due to normal produc-

tion tolerances.

• Signal path.

F : AUDIO

•Abbreviation

CND : Canadian model.

MY : Malaysia model.

SP : Singapore model.

TW : Taiwan model.

On safety

• Before operating the subwoofer, be sure that the

operating voltage of your subwoofer is identical with

that of your local power supply.

• Unplug the subwoofer from the wall outlet if it is not to

be used for an extended period of time. To disconnect

the cord, pull the cord by grasping the plug. Never

pull the cord itself.

• Should any liquid or solid object fall into the

subwoofer, unplug the subwoofer and have the

subwoofer checked by qualified personnel before

operating it any further.

• AC power cord must be changed only at the qualified

service shop.

When turning on or off an amplifier or other

equipment

Lower the volume of the amplifier to minimum.

To avoid damaging the subwoofer

• Be careful in setting the volume control of the amplifier

to avoid an excessive input power.

• Do not attempt to open the enclosure or remold

speaker units and networks.

In case color irregularity is observed on the

nearby TV screen

With the magnetically shielded type of the speaker

system, the speakers can be installed near a TV set.

However, color irregularity may still be observed on the

TV screen depending on the type of your TV set.

If color irregularity is observed...

t Turn off the TV set once, then turn it on after 15 to

30 minutes.

If color irregularity is observed again...

t Place the speakers further apart from the TV set.

When howling occurs

Relocate the speaker or turn down the volume of the

amplifier.

On installation

• Do not install the subwoofer near heat sources such as

radiators or air ducts, or in a place subject to direct

sunlight, excessive dust, mechanical vibration or shock.

• Good ventilation is essential to prevent internal heat

build-up in the subwoofer. Place the subwoofer in a

location with adequate air circulation. Do not place the

subwoofer on a soft surface.

• Use caution when placing the speaker on a specially

treated (waxed, oiled, polished, etc.) floor, as staining

or discoloration may result.

On cleaning the cabinet

Clean the cabinet with a soft cloth lightly moistened with

water. Do not use any type of abrasive pad, scouring

powder or solvent such as alcohol or benzine.

Listening to the Sound ( E )

1 Turn on the amplifier and select the program

source.

2 Press POWER.

The subwoofer turns on and the POWER

indicator lights up in green.

3 Play the program source.

Adjust the VOLUME so that sound from the

front speakers is not distorted.

If it is distorted, the sound from the

subwoofer will also be distorted.

2-2. CIRCUIT BOARDS LOCATION

INPUT CONTROL board

Connecting to an amplifier with a

single set of speaker terminals ( B )

If your amplifier is equipped with a single set of speaker

terminals, connect the subwoofer to the amplifier, and

then connect the front speakers to the subwoofer.

Hookups

1 Connect the subwoofer to the amplifier.

Connect the SPEAKER IN terminals of the

subwoofer to the amplifier’s speaker

terminals with the speaker cords. Be sure to

connect both L and R channels.

2 Connect the front speakers to the subwoofer.

Connect the speakers to the SPEAKER OUT

terminals of the subwoofer.

Notes

• Never set the amplifier’s tone control (BASS, TREBLE,

etc.) or the equalizer output to a high level or input

sinewaves of 20 Hz to 50 Hz recorded on a

commercially-available test disc or special sound (bass

sound of electronic musical instrument, pop noise of

analog disc turntable, sound with abnormally

enhanced bass, etc.) in a high level to this unit. These

actions may cause damage to the speakers.

When a special disc containing abnormally enhanced

bass is played, noise may be output in addition to the

original sound. In such a case, reduce the sound level.

• The subwoofer output signal (DOLBY digital signal)

of the digital surround processor sold singularly is set

10 dB higher by Dolby laboratories Licensing

Corporation. In the case of using normally, adjust the

subwoofer level.

MAIN board

CONTROL board

Connecting to an amplifier with

double (A+B) sets of speaker

terminals ( C )

If your amplifier has double (A+B) sets of speaker

terminals, connect both the subwoofer and the front

speakers to the amplifier.

Hookups

1 Connect the front speakers to the amplifier.

Connect the speakers to your amplifier’s

SPEAKER A terminals.

2 Connect the subwoofer to the amplifier.

Connect the SPEAKER IN terminals of the

subwoofer to the amplifier’s SPEAKER B

terminals using the supplied speaker cords.

Notes

• If the sound distorts when you turn on the bass

reinforcement from your amplifier (such as, DBFB,

GROOVE, the graphic equalizer, etc.), turn off the bass

reinforcement and adjust the sound.

• Do not turn the volume of the subwoofer to maximum.

Doing so may weaken the bass sound. Moreover,

extraneous noise may be heard.

• Selecting NORMAL or REVERSE with the PHASE

selector reverses the polarity and may provide better

bass reproduction in certain listening environments

(depending on the type of front speakers, the position

of the subwoofer and the adjustment of the cut-off

frequency). It may also change the expanse and

tightness of sound, and effect the feeling of the sound

field. Select the setting that provides the sound you

prefer when listening in your normal listening position.

Setting the speaker ( G )

To prevent speaker vibration or movement while

listening, attach the supplied foot pads to the speaker.

POWER TRANS board

If you have any questions or problems concerning your

subwoofer that is not covered in this manual, please

consult your nearest Sony dealer.

Installation

Since the human ear cannot detect the direction and

position where the bass sound being reproduced by a

subwoofer (below 200 Hz) comes from, you can install

the subwoofer wherever you like in your room. To

obtain a better bass reproduction, we recommend you

to install the subwoofer on a solid floor where the

resonance is unlikely to occur.

Notes

•Always install the subwoofer vertically, keeping a few

centimeters away from the wall.

• Do not place an object on the subwoofer or sit on it.

• If the subwoofer is installed in the center of a room, the

bass could be extremely weakened. This is due to the

influence of the standing wave of the room. If this

happens, move the subwoofer away from the center of

a room or eliminate the cause of the standing wave, by

installing a bookshelf on the wall, etc.

When using the double (A+B) sets of speakers, make

sure that you select the “A+B” position with your

amplifier.

Note

When you are using SPEAKER A terminal (front

speaker) only or when the power of the amplifier is

turned off, turn down the volume or turn off the power

of the subwoofer. Otherwise, hum noise may be heard.

SWITCH board

SA-WM250

2-3. PRINTED WIRING BOARDS — MAIN SECTION — • Refer to page 3 for Circuit Boards Location.

: Uses unleaded solder.

(Page 6)

(Page 5)

RV801

R500

CN204

CN202

CN201

CNP111

C801

CN402

R404

JW132

CN301

C411

C402

R217

CNP801

R403

JW131

C401

R 317

R508

JW130

C211

D401

JW 121

C318

JW103

R601

JW120

JW124

C205

C206

R208

JW104

RY301

C209

JW403

C407

C408

IC202

JW133

JW134

IC203

C412

D205 D206

JW135

R207

R504

R215

R301

C310

C403

C404

C309

C308

C305

C306

R308

R304

C307

R401

C302

R305

R309

JW501

C312

C313

C405

C406

R303

C 311

R307

IC301

D302

D301

JW128

• Semiconductor

Location

Ref. No. Location

D205

D-8

D206

D-8

D301

F-4

D302

F-4

D304

C-6

D401

C-3

D402

C-4

D403

C-4

D501

B-5

D502

F-4

D602

B-8

IC202

D-9

IC203

D-10

IC301

F-7

Q501

B-6

Q502

C-6

Q503

B-7

Q504

B-7

Q505

F-4

SA-WM250

2-4. PRINTED WIRING BOARD — INPUT CONTROL SECTION — • Refer to page 3 for Circuit Boards Location.

: Uses unleaded solder.

(Page 4)

C703

R701

JW702

R203

R703

CN101

JW207

CN701

R204

R702

C705

IC201

C702

RV701

IC701

R705

R704

C701

JW701

C706

R109

R102

R104

C201

R107

J101

R105

R106

R101

S701

TM101

• Semiconductor

Location

Ref. No. Location

D201

C-12

D202

C-12

D203

C-11

D204

C-12

IC201

C-10

IC701

C-2

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