ICF-704S SERVICE MANUAL FM/SW/MW 3 BAND RADIO. Australian Model. Ver

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SERVICE MANUAL Australian Model Ver.0 2004. 04 SPECIFICATIONS Frequency range: Band FM SW MW ICF-704S 87.5-08.0 MHz 5.95-8 MHz 530-605 khz Speaker: Approx. 0.2 cm (4 /8 inches) dia.

1 SERVICE MANUAL Australian Model Ver SPECIFICATIONS Frequency range: Band FM SW MW ICF-704S MHz MHz khz Speaker: Approx. 0.2 cm (4 /8 inches) dia. 8 ohms Power output: 450 mw (at 0 % harmonic distortion) Output: v (earphone) (ø 3.5 mm minijack) Power requirements: 230 V AC, 50 Hz 6V DC, four R6 (size AA) batteries Dimensions: Approx mm (w/h/d) ( /8 6 /8 3 3/8 inches) incl. projecting parts and control with carrying handle pushed in. Mass: Approx. 2 g (2 lb 0.7 oz) incl. batteries Supplied accessory: AC power cord () Design and specifications are subject to change without notice. FM/SW/MW 3 BAND RADIO D Sony Corporation Personal Audio Company Published by Sony Engineering Corporation

2 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. CF4 white/white only mark mark CF4 mark mark CF2 CF3 CF2 CF3 mark red blue orange black white white/white yellow Center Frequency 0.70 MHz 0.67 MHz 0.73 MHz 0.64 MHz 0.76 MHz 0.75 MHz 0.79 MHz TABLE OF CONTENTS. GENERAL DISASSEMBLY 2-. Cabinet (Front) Assy Chassis Section Main Board Setting the Pointer ELECTRICAL S MW Section... 7 SW Section... 7 FM Section DIAGRAMS 4-. Note for Printed Wiring Boards and Schematic Diagrams Printed Wiring Board Main Section Printed Wiring Boards Power Section Schematic Diagram EXPLODED VIEWS 5-. Cabinet (Front) Section Cabinet (Rear) Section ELECTRICAL PARTS LIST... 5 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 PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY. 2

3 SECTION GENERAL ICF-704S This section is extracted from instruction manual. OPERATE ($ON/4STANDBY) Band Gamme Wellenbereich Banda Banda TUNE indicator Indicateur TUNE TUNE-Anzeige Indicador de sintonia (TUNE) Indicatore TUNE Telescopic antenna Antenne télescopique Teleskopantenne Antena telescópica Antenna telescopica TUNING MIN VOL TONE LOW MAX HIGH Choosing Power Sources Installing the batteries (See Fig. A) Open the lid of the battery compartment. 2 Install four R6 (sizeaa) batteries (not supplied) with correct polarity. 3 Close the lid. Note When operating the unit on batteries, remove the AC power cord from the AC IN jack. The unit cannot be operated on batteries when the AC power cord is connected to the AC IN jack. Battery life (Approx. hours) (JEITA*) When using FM SW AM(MW) LW Sony alkaline LR6 (size AA) Sony R6 (size AA) * Measured by JEITA (Japan Electronics and Information Technology Industries Association) Standards. The actual battery life may vary depending on the circumstance of the unit. A B v C R6 (size AA) battery 4 pile R6 (format AA) 4 Mignonzelle (R6/AA) 4 pila R6 (tamaño AA) 4 Pila R6 (formato AA) 4 FM UKW AC IN 2 3 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. Carrying handle Poigné de transport Tragegriff Asa de transporte Maniglia di trasporto 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 4 To a wall outlet Vers une prise murale An eine Netzsteckdose A la toma de pared Alla presa di rete AM (MW)/LW AM (PO)/GO Replacing batteries When the sound becomes weak or distorted, replace all the batteries with new ones. Notes on batteries Do not charge the dry batteries. Do not carry the dry batteries with coins or other metallic objects. It can generate heat if the positive and negative terminals of the batteries are accidentally contacted by a metallic object. Do not use different types of batteries at the same time. When you replace the batteries, replace all with new ones. When you are not going to use the unit for a long time, remove the batteries to avoid damage from battery leakage and corrosion. House Current (See Fig. B) Connect the AC power cord (supplied) to the AC IN jack of the radio. 2 Plug into a wall outlet. Note Use only the supplied AC power cord. Operating the Radio Press OPERATE ($) to turn on the radio. 2 Select a desired band, and tune into a station using TUNING. TUNE (tuning) indicator lights up when a station is tuned in. 3 Adjust the volume using VOL. 4 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 OPERATE (4). To listen with an earphone connect the earphone (not supplied) to the v (earphone) jack. The speaker is deactivated when an earphone is connected. Improving the Reception (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: Rotate the unit horizontally for optimum reception. A ferrite bar antenna is built into the unit. Note Adjust the direction of the antenna by holding the bottom of it. The antenna can be damaged when you move the antenna with excessive force. 3

4 SECTION 2 DISASSEMBLY Note : This set can be disassemble according to the following sequence. SET 2-. CABINET (FRONT) ASSY (Page 5) 2-2. CHASSIS SECTION (Page 5) 2-3. MAIN BOARD (Page 6) 2-4. SETTING THE POINTER (Page 6) 4

5 Note : Follow the disassembly procedure in the numerical order given. 2-. CABINET (FRONT) ASSY 9 5 two BV tapping screws (B2.6) handle 8 screw (M3) 0 antenna contact plate 7 two BV tapping screws (B2.6) 6 two BV tapping screws (B2.6) battery case lid qa CN qs cabinet (rear) assy 3 two screws (.7) qd cabinet (front) assy claw 2 screw (.7) knob (TUNE) 4 transparent cover 2-2. CHASSIS SECTION 2 two BV tapping screws (B2.6) Remove the two solderings. 3 chassis section 5

6 2-3. MAIN BOARD 0 MAIN board 9 chassis assy 4 BV tapping screw (B2.6) 7 5 claw 3 VC drum D2 2 screw (M2.6) 8 6 claw two knobs (control) 2-4. SETTING THE POINTER Setting the Pointer. Rotate the VC drum in the direction of the arrow until it is stopped. 2. Fit the rack on the projection of the chassis. 3. Fit the back plate on the bosses and attach the plate. 4. Install the pointer. boss VC drum chassis rack back plate pointer boss rack 6

7 SECTION 3 ELECTRICAL S ICF-704S MW SECTION SW SECTION BAND switch : MW BAND switch : SW AM RF signal generator Put the lead-wire antenna close to the set. AM RF signal generator 0pF telescopic antenna terminal set 400Hz, 30% AM modulation Output level: as low as possible 400Hz, 30% AM modulation Output level: as low as possible level meter level meter 6 Ω 6 Ω set set v jack (J) v jack (J) Repeat the procedures in each adjustment several times, and the frequency coverage and tracking adjustments should be finally done by the trimmer capacitors. Repeat the procedures in each adjustment several times, and the frequency coverage and tracking adjustments should be finally done by the trimmer capacitors. MW IF Adjust for a maximum reading on level meter T 455 khz SW FREQUENCY COVERAGE Adjust for a maximum reading on level meter L MHz CT MHz MW FREQUENCY COVERAGE Adjust for a maximum reading on level meter L5 520 khz CT-2,650 khz SW TRACKING Adjust for a maximum reading on level meter L MHz CT MHz MW TRACKING Adjust for a maximum reading on level meter L4 600 khz CT-,400 khz 7

8 FM SECTION BAND switch : FM Repeat the procedures in each adjustment several times, and the frequency coverage and tracking adjustments should be finally done by the trimmer capacitors. FM RF signal generator 0.0µF telescopic antenna terminal set FM FREQUENCY COVERAGE Adjust for a maximum reading on level meter L MHz CT MHz 22.5kHz frequency deviation by 400Hz signal Output level: as low as possible 6 Ω level meter FM TRACKING Adjust for a maximum reading on level meter L, MHz CT MHz Adjustment Location: MAIN BOARD set v jack (J) L,2 FM TRACKING L6 SW TRACKING CT2 SW TRACKING T MW IF MAIN BOARD (SIDE A) S CV RV RV2 J L3 FM FREQUENCY COVERAGE L5 MW FREQUENCY COVERAGE L7 SW FREQUENCY COVERAGE CT3 SW FREQUENCY COVERAGE CT-4 FM FREQUENCY COVERAGE MAIN BOARD (SIDE B) L4 MW TRACKING CT-3 FM TRACKING CT-2 MW FREQUENCY COVERAGE CT- MW TRACKING 8

9 SECTION 4 DIAGRAMS ICF-704S 4-. 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.) For schematic diagrams. Note: All capacitors are in µf unless otherwise noted. pf: µµf 50 WV or less are not indicated except for electrolytics and tantalums. All resistors are in Ω and /4 W or less unless otherwise specified. f : internal component. C : panel designation. Note: The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified. A : B+ Line. H : adjustment for repair. Total current is measured with power on. Power voltage is dc 6V and fed with regulated dc power supply from battery terminal. Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM ( ) : MW Voltages are taken with a VOM (Input impedance 0 MΩ). Voltage variations may be noted due to normal production tolerances. Signal path. F : FM f : MW For printed wiring boards. Note: X : parts extracted from the component side. Y : parts extracted from the conductor side. a : Through hole. : Pattern from the side which enables seeing. (The other layers' patterns are not indicated.) Caution: Pattern face side: Parts on the pattern face side seen from the (Side B) pattern face are indicated. Parts face side: Parts on the parts face side seen from the (Side A) parts face are indicated. C Q B E These are omitted 9 9

10 4-2. PRINTED WIRING BOARD MAIN SECTION A ANT FM/SW TELESCOPIC ANTENNA MAIN BOARD D B C D E BRN L4 AM FERRITE ROD BAR ANTENNA GRY CV BRN C48 CV-3 CT-3 (FM RF) C2 L2 L CV- CT- (AM RF) C8 C9 CT2 C L6 JW C8 C BP S S-5 C0 JC S-3 S-6 S-4 R3 JW4 JW4 JW6 JW5 BPF 3 R2 CF2 5 C25 R7 C28 R6 CF3 IC C29 6 C30 C35 C33 C34 T JW8 CF C36 C37 B C E Q Q4 B C E C3 JW9 C32 C47 B C E B C E R3 Q3 Q2 +B CN GND A POWER BOARD W0 (Page ) C27 C40 F G CV-4 CT-4 (FM OSC) L3 C4 C5 C6 R CV-2 CT-2 (AM OSC) C7 C6 C5 C4 C3 C2 JW2 JW3 R5 C23 C22 CT3 S- S-2 JW5 JW3 JW7 CF4 C26 C42 C50 30 C24 C44 C43 C4 JW6 JW0 R9 JW2 R0 JW C45 W2 2 H L5 L7 SP+ SP- GRY SP SPEAKER D2 I LED+B LED METER R8 RV C39 RV2 Semiconductor Location Ref. No. Location D A-8 D2 H-3 J D2 TUNE CV TUNING RV VOL S (BAND) SW MW FM RV2 TONE J R IC D-0 Q E- Q2 E-2 Q3 E-2 Q4 C-2 0 0

11 4-3. PRINTED WIRING BOARDS POWER SECTION A POWER BOARD AC2 SWITCH BOARD GRY 3 W03 B S0 R0 S0 OPERATE T0 ON STANDBY C AC W03 3 GRY D E C03 DRY BATTERY SIZE "AA" (IEC DESIGNATION LR6) 4PCS,6V F G H C0 D0 D02 C02 W02 3 GRY W0 2 A MAIN BOARD CN (Page 0) GRY GRY W02 3 AC INLET BOARD J0 ~ AC IN I AC AC J

12 2 2 ICF-704S CF3 CF2 IC CF4 RV T CF RV2 SP BPF R2 CV-3 CT-3 C2 L4 CT- C8 C9 S-3 S-4 CV- JW R3 C0 L6 C C S-5 C48 JW5 JC JW4 JW4 ANT D BP JW5 C24 S-2 JW7 JW3 R8 C27 C25 C26 L3 CV-4 CT-4 C4 C5 C6 R JW2 CV-2 S- C8 C2 C3 C4 C5 C7 C6 CT-2 L5 JW3 R5 C23 C22 CT3 L7 R6 R7 JW6 JW9 S-6 Q4 JW8 Q3 C37 R3 C47 C36 Q Q2 C3 C30 C32 C35 C33 C39 JW0 C4 C43 C42 C40 C44 C50 JW2 R0 R9 JW T0 C0 D0 D02 C02 C03 S0 R0 J C29 L L2 C28 D2 JW6 C45 R2 W03 W03 W02 W02 W2 CN W0 J0 CT SCHEMATIC DIAGRAM

13 SECTION 5 EXPLODED VIEWS ICF-704S NOTE: The mechanical parts with no reference number in the exploded views are not supplied. Items marked * are not stocked since they are seldom required for routine service. Some delay should be anticipated when ordering these items. Color Indication of Appearance Parts Example : KNOB, BALANCE (WHITE)... () R R Parts Color Cabinet s Color Accessories are given in the last of this parts list. The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified. 5-. CABINET (FRONT) SECTION L SP 23 D # Ref. No. Part No. Description Remark SLIDER (BAND SELECTION) SPRING (BAND) GEAR, MIDWAY CHASSIS SHAFT (TUNE) RACK PLATE, BACK POINTER DRUM (A), VC DRUM (B), VC SPRING (DRUM) SCREW (M2.6), (+) P SCREW (.7) SPRING (TUNING) KNOB (TUNE) KNOB (CONTROL) SPRING, RING COVER, TRANSPARENT 9 X CABINET (FRONT) SUB ASSY Ref. No. Part No. Description Remark SPACER (BOSS) KNOB (BAND) 3B BUTTON (POWER) SCREW (B2.6), (+) PWH TAPPING * 24 A A MAIN BOARD, COMPLETE HOLDER (ANT) SCREW (B2.6), (+) BV TAPPING TERMINAL, LED CONTACT CUSHION (BATTERY CASE LID) SCREW (B2.6), (+) BV TAPPING LID, BATTERY CASE CUSHION (GEAR) CUSHION CUSHION (B) D LED SLP-8B-5 (TUNE) L ANTENNA, FERRITE-ROD (MW) SP SPEAKER (0cm) # BALL, STEEL 3

14 5-2. CABINET (REAR) SECTION ANT not supplied T0 J0 56 not supplied 54 The components identified by mark 0 or dotted line with mark. 0 are critical for safety. Replace only with part number specified. Ref. No. Part No. Description Remark CABINET (REAR) TERMINAL (+ ), BATTERY SPRING (HANDLE) SCREW (B2.6), (+) BV TAPPING TERMINAL ( ), BATTERY * AC INLET BOARD * POWER BOARD TERMINAL (+), BATTERY PLATE, ANTENNA CONTACT SHAFT (HANDLE) Ref. No. Part No. Description Remark * SWITCH BOARD HANDLE SCREW (M3), (+) P FOOT, RUBBER SHEET (C), INSULATING CUSHION (B) ANT ANTENNA, TELESCOPIC (FM) 0 J INLET, AC 2P (- AC IN) 0 T TRANSFORMER, POWER 4

15 NOTE: Due to standardization, replacements in the parts list may be different from the parts specified in the diagrams or the components used on the set. RESISTORS All resistors are in ohms. METAL:Metal-film resistor. METAL OXIDE: Metal oxide-film resistor. F:nonflammable Abbreviation AUS : Australian model SECTION 6 ELECTRICAL PARTS LIST Items marked * are not stocked since they are seldom required for routine service. Some delay should be anticipated when ordering these items. SEMICONDUCTORS In each case, u : µ, for example: ua.. : µa.. upa.. : µpa.. upb.. : µpb.. upc.. : µpc.. upd.. : µpd.. CAPACITORS uf : µf COILS uh : µh AC INLET The components identified by mark 0 or dotted line with mark. 0 are critical for safety. Replace only with part number specified. When indicating parts by reference number, please include the board. ICF-704S MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark * AC INLET BOARD ************** < AC INLET > 0 J INLET, AC 2P (- AC IN) ************************************************************* * A A MAIN BOARD, COMPLETE ********************* SCREW (B2.6), (+) BV TAPPING TERMINAL, LED CONTACT HOLDER (ANT) < BPF > C CERAMIC CHIP uf 0V C CERAMIC CHIP 0.022uF 0% 25V C CERAMIC CHIP 0.022uF 0% 25V C CERAMIC CHIP 0.022uF 0% 25V C CERAMIC CHIP 0.047uF 0% 6V C CERAMIC CHIP 0.00uF 0% 50V C ELECT 47uF 20% 35V C CERAMIC CHIP uf 0V C ELECT 470uF 20% 0V C CERAMIC CHIP uf 0V C ELECT 470uF 20% 0V C CERAMIC CHIP uf 0V C CERAMIC CHIP 0.00uF 0% 50V C CERAMIC CHIP uf 0V BPF FILTER, BAND PASS < CAPACITOR > C CERAMIC CHIP 0.00uF 0% 50V C CERAMIC CHIP 22PF 5% 50V C CERAMIC CHIP 7PF 0.5PF 50V C CERAMIC CHIP 0PF 0.5PF 50V C CERAMIC CHIP 8PF 0.5PF 50V C CERAMIC CHIP 0PF 0.5PF 50V C CERAMIC CHIP 0PF 0.5PF 50V C CERAMIC CHIP 0.0uF 0% 25V C CERAMIC CHIP 3PF 0.25PF 50V C CERAMIC CHIP 220PF 5% 50V C CERAMIC CHIP 00PF 5% 50V C CERAMIC CHIP 47PF 5% 50V C CERAMIC CHIP 22PF 5% 50V C CERAMIC CHIP 22PF 5% 50V C CERAMIC CHIP 7PF 0.5PF 50V C CERAMIC CHIP uF 0% 50V C CERAMIC CHIP 0PF 0.5PF 50V C CERAMIC CHIP 7PF 0.5PF 50V C ELECT 0uF 20% 50V C CERAMIC CHIP 0.0uF 0% 25V C ELECT 4.7uF 20% 50V C CERAMIC CHIP 0.uF 25V C CERAMIC CHIP 00PF 5% 50V C CERAMIC CHIP 0.0uF 0% 25V C CERAMIC CHIP 0.0uF 0% 25V C ELECT 4.7uF 20% 50V C ELECT 0uF 20% 50V < FILTER > CF FILTER, CERAMIC CF FILTER, CERAMIC CF FILTER, CERAMIC CF FILTER, CERAMIC < CONNECTOR > * CN PIN, CONNECTOR (PC BOARD) 2P < VARIABLE CAPACITOR > CT CAP, VAR CV CAP, VAR (TUNING) < TRIMMER > CT CAP, CERAMIC TRIMMER 0PF CT CAP, CERAMIC TRIMMER 0PF < DIODE > D DIODE PS226-5 < IC > IC IC CXA09S < JACK > J JACK (v) < JUMPER RESISTOR > JC SHORT CHIP 0 5

16 MAIN POWER SWITCH Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < COIL > L COIL, AIR-CORE L COIL, AIR-CORE L COIL, FM OSC L ANTENNA, FERRITE-ROD (MW) L COIL, OSC (MW) L COIL, SW (ANT) L COIL, OSC (SW) < TRANSISTOR > Q TRANSISTOR 2SC408-R Q TRANSISTOR DTC44EUA-T06 Q TRANSISTOR DTC44EUA-T06 Q TRANSISTOR DTC44EUA-T06 < RESISTOR > R METAL CHIP 0K 5% /0W R METAL CHIP K 5% /0W R METAL CHIP 47K 5% /0W R METAL CHIP 0K 5% /0W R METAL CHIP 2.2K 5% /0W R METAL CHIP 220 5% /0W R METAL CHIP K 5% /0W R METAL CHIP 2.2K 5% /0W R METAL CHIP 4.7K 5% /0W R METAL CHIP 47 5% /0W R METAL CHIP 00K 5% /0W < VARIABLE RESISTOR > RV RES, VAR, CARBON 50K (VOL) RV RES, VAR, CARBON 0K (TONE) < SWITCH > S SWITCH, SLIDE (BAND) < TRANSFORMER > T TRANSFORMER, IF ************************************************************* * POWER BOARD ************* < CAPACITOR > C CERAMIC CHIP 0.uF 25V C CERAMIC CHIP 0.uF 25V C ELECT 2200uF 20% 0V < DIODE > D DIODE N4002B D DIODE N4002B ************************************************************* * SWITCH BOARD ************* < RESISTOR > R METAL CHIP 0K 5% /0W < SWITCH > S SWITCH, PUSH ( KEY) (OPERATE) ************************************************************* MISCELLANEOUS *************** ANT ANTENNA, TELESCOPIC (FM) D LED SLP-8B-5 (TUNE) SP SPEAKER (0cm) 0 T TRANSFORMER, POWER ************************************************************* ACCESSORIES ************ CORD, POWER MANUAL, INSTRUCTION (ENGLISH,FRENCH, GERMAN,SPANISH,ITALIAN,DUTCH,SWEDISH, PORTUGUESE,FINNISH) 6 The components identified by mark 0 or dotted line with mark. 0 are critical for safety. Replace only with part number specified.

17 MEMO 7

18 REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision New 8

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