Sony SAWFT-3 Service manual

SA-FT3H/WFT3/

SS-CNF3H/FRF3H

SERVICE MANUAL

Ver. 1.0 2005. 07

SA-WFT3

• SA-FT3H is composed of following models.

COMPONENT MODEL NAME

FRONT/SURROUND SPEAKER SS-FRF3H CENTER SPEAKER SS-CNF3H SUBWOOFER SA-WFT3

SS-FRF3H

US Model

Canadian Model

AEP Model

UK Model

E Model

SS-CNF3H

AUDIO POWER SPECIFICATIONS (US, CND model)

POWER OUTPUT AND TOTAL HARMONIC DISTORTION: With 6 ohm loads, from 28 – 200 Hz; rated 150 watts per channel minimum RMS power, with no more than 10% total harmonic distortion from 250 milliwatts to rated output.

SS-FRF3H (front/surround speakers)

Speaker system 2 way, magnetically shielded Speaker units Woofer: 10 cm, cone

type Tweeter: 2.5 cm, balanced

dome type Enclosure type Bass reflex Rated impedance 8 ohms Power handling capacity Maximum input power: 110 W Sensitivity level 84 dB (1 W, 1 m) Frequency range 140 Hz – 50,000 Hz Dimensions (w/h/d) Approx. 120 × 360 × 32 mm

with table top stand Approx. 120 × 372 × 32 mm

(Diameter of base: 190 mm) Mass Approx. 0.9 kg

with table top stand Approx. 0.95 kg

SPECIFICATIONS

SS-CNF3H (center speaker)

Speaker system 2 way, magnetically shielded Speaker units Woofer: 8 cm (× 2), cone

type Tweeter: 2.5 cm,

dome type Enclosure type Bass reflex Rated impedance 8 ohms Power handling capacity Maximum input power: 110 W Sensitivity level 84 dB (1 W, 1 m) Frequency range 150 Hz – 50,000 Hz Dimensions (w/h/d) Approx. 430 × 88 × 32 mm

with table top stand Approx. 430 × 98 × 66 mm

Mass Approx. 0.85 kg

with table top stand Approx. 0.9 kg

– Continued on next page –

9-879-802-01

HOME THEATRE SPEAKER SYSTEM

Sony Corporation

Audio Group Published by Sony Engineering Corporation

SA-FT3H/WFT3/SS-CNF3H/FRF3H

SA-WFT3 (subwoofer)

Speaker system Active subwoofer,

magnetically shielded

Speaker units Woofer: 15 cm (× 2), cone

type

Enclosure type Acoustically Loaded

Bass reflex

Reproduction frequency range

28 Hz – 200 Hz

Continuous RMS power output

150 W (6 ohms 100 Hz, 10% THD)

Input

LINE IN (input pin jack)

General

Power requirements US, CND model: 120 V AC, 60 Hz AEP, UK model: 230 V AC, 50/60 Hz SP, MY model: 220 – 230 V AC, 50/60 Hz Power consumptions 80 W

0.3 W (standby mode) Dimensions (w/h/d) Approx. 182 × 477 × 353 mm Mass Approx. 12 kg

Supplied accessories SA-FT3H:

Speaker cord (3.5 m) (3) Speaker cord (10 m) (2) Tab le top stand cover (4) Tab le top stand base (4) Center speaker stand base (1) Center speaker stand adjuster (1) Cushion (20) Rear pad (10) Screw (M5) (5) Screw (M4) (2) Screw (M3.5) (16)

SS-FRF3H:

Speaker cord (10 m) (1) Tab le top stand base (1) Tab le top stand cover (1) Screw (M5) (1) Screw (M3.5) (4) Cushion (4) Rear pad (2)

Design and specifications are subject to change without notice.

•Abbreviation

CND : Canadian model SP : Singapore model MY : Malaysia model

SAFETY CHECK-OUT

After correcting the original service problem, perform the following 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.

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 microamperes). 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” indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A)

To Exposed Metal Parts on Set

0.15

Ω

1.5k

Earth Ground

AC voltmeter (0.75V)

Fig. A. Using an AC voltmeter to check AC leakage.

SAFETY-RELATED COMPONENT WARNING!!

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.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!!

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-FT3H/WFT3/SS-CNF3H/FRF3H

1. DISASSEMBLY

1-1. Rear Panel Section .............................................................. 4

1-2. Main Board, Power AMP Board ......................................... 5

2. DIAGRAMS

2-1. Block Diagram .................................................................... 7

2-2. Printed Wiring Boards – Main Section – ............................ 8

2-3. Printed Wiring Boards – Control Section –......................... 9

2-4. Schematic Diagram – Main Section – ............................... 10

3. EXPLODED VIEWS

3-1. Front/Surround Speaker Section (SS-FRF3H) ..................11

3-2. Center Speaker Section (SS-CNF3H) ............................... 12

3-3. Subwoofer Section (1) (SA-WFT3) .................................. 13

3-4. Subwoofer Section (2) (SA-WFT3) .................................. 14

4. ELECTRICAL PARTS LIST......................................... 15

SA-FT3H/WFT3/SS-CNF3H/FRF3H

)

SECTION 1

DISASSEMBLY

• The equipment can be removed using the following procedure.

SET

1-1. REAR PANEL SECTION

(Page 4)

1-2. MAIN BOARD,

POWER AMP BOARD (Page 5)

Note : Follow the disassembly procedure in the numerical order given.

1-1. REAR PANEL SECTION

CN101 (6P)

BC602 (2P)

BC901 (2P)

BC904 (3P)

four tapping screws (1)

20)

(3.5

four tapping screws (1

(3.5 × 20)

rear panel section

1-2. MAIN BOARD, POWER AMP BOARD

)

screw

(+BVTP 3

two screws

(+BVTP 3

MAIN board

CN601 (6P)

BC905 (3P)

BC601 (3P)

CN402 (6P)

CNP702 (5P)

SA-FT3H/WFT3/SS-CNF3H/FRF3H

tapping screw (1)

20)

(3.5

BC401 (2P)

tapping screw (1)

(3.5

three tapping screws (1

(3.5 × 20)

two screws

(+BVTP 3

POWER AMP board

CN701 (5P)

three tapping screws (1)

20)

(3.5

20)

two screws

(+BVTP 3

BC903 (2P)

SA-FT3H/WFT3/SS-CNF3H/FRF3H

• Circuit Boards Location

MAIN board

LED board

SECTION 2

DIAGRAMS

CONTROL board

POWER AMP board

POWER SWITCH boar

Note on Schematic Diagram:

• All capacitors are in µF unless otherwise noted. (p: pF) 50 WV or less are not indicated except for electrolytics and tantalums.

• All resistors are in Ω and 1/ specified.

• 2 : nonflammable resistor.

• C : panel designation.

Note:

The components identified by mark 0 or dotted line with mark 0 are criti- cal for safety. Replace only with part number specified.

• A : B+ Line.

• B : B– Line.

•Voltage is dc with respect to ground under no-signal (detuned) condition.

•Voltages are taken with a VOM (Input impedance 10 MΩ). Voltage variations may be noted due to normal production tolerances. no mark : POWER ON

• Signal path. F : LINE

• Abbreviation CND : Canadian model. SP : Singapore model. MY : Malaysia model.

: Impossible to measure

∗

W or less unless otherwise

Note:

Les composants identifiés par une marque 0 sont critiques pour la sécurité. Ne les remplacer que par une piéce portant le numéro spécifié.

Note on Printed Wiring Boards:

• X : parts extracted from the component side.

• : Pattern from the side which enables seeing.

• Abbreviation CND : Canadian model. SP : Singapore model. MY : Malaysia model.

BCE

These are omitted.

+ 14 hidden pages

Sony SAWFT-3 Service manual

TABLE OF CONTENTS

DISASSEMBLY

1-1. REAR PANEL SECTION

1-2. MAIN BOARD, POWER AMP BOARD

DIAGRAMS