Sony ICF-703S Service manual

ICF-703S

SERVICE MANUAL

Ver 1.1 2001. 09

(Photo: BLACK)

SPECIFICA TIONS

Frequency range: Band ICF-703S

FM 87.5 - 108.0 MHz SW 5.95 - 18 MHz MW 530 - 1605 kHz

AEP Model

Australian Model

Speaker

Approx. 10.2 cm (4

Power output

430 mW (at 10 % harmonic distortion)

Output

v jack (ø 3.5 mm minijack)

Power requirements

With the supplied AC power cord:

220 - 230 V AC, 50 Hz (AEP model) 240 V AC, 50 Hz (Australian model) With four R6 (size AA) batteries: 6V DC

Dimensions

Approx. 265 × 137 × 69 mm (w/h/d) (10 1/2 × 5 1/2 × 2 3/4 inches) incl. projecting parts and control with carrying handle pushed in.

Mass

Approx. 1019 g (2 lb 4 oz) incl. batteries

Supplied accessory

AC power cord (1)

Design and specifications are subject to change without notice.

1/8 inches) dia. 8 ohms

9-927-916-12

FM/SW/MW 3 BAND RADIO

Sony Corporation

Personal Audio Company Shinagawa Tec Service Manual Production Group

– 1 –

HOW TO CHANGE THE CERAMIC FILTERS

This model is used two ceramic filters of CF2, CF3 and CF4. You must use same type of color marked ceramic filters in order to meet same specifications. Therefore, the ceramic filter must change two pieces together since it’s supply two pieces in one package as a spare parts.

markmark

CF4

• white/white only mark mark

CF4

CF2 CF3

mark

red 10.70 MHz blue 10.67 MHz orange 10.73 MHz black 10.64 MHz white 10.76 MHz white/white 10.75 MHz yellow 10.79 MHz

Center Frequency

Notes on Chip Component Replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be

damaged by heat.

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 P AR T NUMBERS APPEAR AS SHO WN IN THIS MANU AL OR IN SUPPLEMENTS PUBLISHED BY SONY.

– 2 –

SECTION 1

GENERAL

This section is extracted from instruction manual.

OPERATION ($ON/4STANDBY)

TUNE indicator Indicateur TUNE TUNE-Anzeige Indicador de sintonia (TUNE) Indicatore TUNE

ICF-703

ICF-703S

ICF-703L

Telescopic antenna Antenne télescopique Teleskopantenne Antena telescópica Antenna telescopica

Choosing Power Sources

Batteries (See Fig.

Open the lid of the battery case.

Slide fully in the direction of the arrow (B) on the lid and lift it. Do not force to open it. Doing so may damage the unit.

Insert four R6 (sizeAA) batteries (not supplied) with correct polarity.

Close the lid.

Battery life

Using Sony LR6(size AA) alkaline batteries: Approx. 100 hours Using Sony R6 (size AA) batteries: Approx. 35 hours

Replacing batteries

When the sound becomes weak or distorted, replace all the batteries with new ones.

Notes on batteries

• Insert the batteries with correct polarity.

• Do not charge the dry batteries.

• Do not use different types of batteries at the

same time.

• When you replace the batteries, replace all with new ones.

• When the unit is not being used for a long period of time, remove the batteries to avoid

damage from battery leakage and corrosion.

• If a battery leakage occurs, wipe the battery compartment with a soft cloth before inserting new ones.

R6 (size AA) battery x 4 pile R6 (format AA) x 4 Mignonzelle (R6/AA) x 4 pila R6 (tomaño AA) x 4 pila R6 (formato AA) x 4

Carrying handle Poigné de transport Tragegriff Asa de transporte Maniglia di trasporto

FM UKW

Insert the # side of the battery first. Insérez le côté # de la pile en premier. Batterie mit der # Seite zuerst einlegen. Inserte en primer lugar el lado # de las pilas Inserire prima il lato # della pila.

v jack Prise v v-Buchse Toma v Presa v

AC IN AC power cord (supplied)

Cordon d’alimentation secteur Netzkabel (mitgeliefert) Cable de alimentación de CA (suministrado) Cavo di alimentazione CA in dotazione

SW OC KW

AM (MW)/LW AM (PO)/GO

House Current (See Fig.

Connect the AC power cord supplied to the AC IN jack of the radio.

Plug into a wall outlet.

Operating the Radio

Press OPERATION ($) to turn on the radio.

Select a desired band, and tune in a station using TUNING. TUNE (tuning) indicator lights up when a station is tuned in.

Adjust the volume using VOL.

Adjust the tone to your preference using TONE.

To obtain clear treble, turn to “HIGH”. To reinforce bass, set to “LOW”.

• To turn off the radio, press OPERATION (4).

• To listen with an earphone connect the

earphone to the v (earphone) jack. The spearker is deactivated when an earphone is connected.

• To improve Receiving condition (See Fig. C ) FM: Extend the telescopic antenna and adjust

the length and angle for the best reception.

SW: Extend the telescopic antenna vertically. AM(MW)/LW : Since the reception is affected

by the direction of the radio, rotate the unit horizontally for optimum reception.

– 3 –

SECTION 2

DISASSEMBLY

Note : This set can be disassemb le according to the following sequence.

Set Cabinet (Rear) Power Board Main Board, Led Board Setting the Pointer

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

2-1. CABINET (REAR)

2-2. POWER BOARD

4 BTP 3x16

lid, battery case

2 BTP 3x16

3 BTP 3x16

5 cabinet (rear)

5 button (power)

1 BTP 3x10

3 CN401

6 POWER board

4 Removal the solders.

BRN

BLK

CN401

BLK

– 4 –

2-3. MAIN BOARD, LED BOARD

3 chassis

6 LED board

5 BTP 2.6x5

8 BTP 3x10

4 Removal the solder.

7 BTP 3x10

qa MAIN board

9 claws

2-4. SETTING THE POINTER

• Setting the Pointer

1. Turn the Knob (Tuning) in the direction of A until it is stopped.

2. Place the rack as shown in the figure.

3. Mount the pointer.

rack (pointer)

1 knob (control)

2 knob (band)

2 pointer

1 rack (pointer)

– 5 –

+ 9 hidden pages