Sony ICF-703S Service Manual
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Sony ICF-703S Service Manual

Sony ICF-703S Service Manual

Fm/sw/mw 3 band radio
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SERVICE MANUAL
Ver 1.1 2001. 09
SPECIFICATIONS
Frequency range:
Band
ICF-703S
FM
87.5 - 108.0 MHz
SW
5.95 - 18 MHz
MW
530 - 1605 kHz
Speaker
Approx. 10.2 cm (4
inches) dia. 8 ohms
1/8
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)
× 5
× 2
(10
inches) incl. projecting parts
1/2
1/2
3/4
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.
Sony Corporation
9-927-916-12
2001I0400-1
Personal Audio Company
© 2001. 9
Shinagawa Tec Service Manual Production Group
ICF-703S
(Photo: BLACK)
FM/SW/MW 3 BAND RADIO
– 1 –
AEP Model
Australian Model

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  • Page 1 ICF-703S SERVICE MANUAL AEP Model Australian Model Ver 1.1 2001. 09 (Photo: BLACK) SPECIFICATIONS Frequency range: Band ICF-703S 87.5 - 108.0 MHz 5.95 - 18 MHz 530 - 1605 kHz Speaker Approx. 10.2 cm (4 inches) dia. 8 ohms Power output...

  • Page 2: 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.

  • Page 3: Section 1 General

    Indicador de sintonia (TUNE) supplied) with correct polarity. Indicatore TUNE Close the lid. ICF-703 Battery life Using Sony LR6(size AA) alkaline batteries: Approx. 100 hours Using Sony R6 (size AA) batteries: Approx. 35 hours ICF-703S Replacing batteries When the sound becomes weak or distorted, replace all the batteries with new ones.

  • Page 4: Section 2 Disassembly

    SECTION 2 DISASSEMBLY Note : This set can be disassemble according to the following sequence. 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) lid, battery case 4 BTP 3x16 2 BTP 3x16...

  • Page 5: Setting The Pointer

    2-3. MAIN BOARD, LED BOARD 4 Removal the solder. 8 BTP 3x10 7 BTP 3x10 qa MAIN board 3 chassis 9 claws 6 LED board 5 BTP 2.6x5 1 knob (control) 2 knob (band) 2-4. SETTING THE POINTER • Setting the Pointer 1.

  • Page 6: Section 3 Electrical Adjustments

    SECTION 3 ELECTRICAL ADJUSTMENTS MW SECTION SW SECTION BAND switch : MW BAND switch : SW AM RF signal AM RF signal telescopic Put the lead-wire generator generator antenna terminal antenna close to the set. 12pF 400Hz, 30% 400Hz, 30% AM modulation AM modulation Output level: as low as possible...
  • Page 7 FM SECTION • Repeat the procedures in each adjustment several times, and the frequency coverage and tracking adjustments should be finally BAND switch : FM done by the trimmer capacitors. FM RF signal telescopic FM FREQUENCY COVERAGE ADJUSTMENT generator antenna terminal Adjust for a maximum reading on level meter 86.5 MHz 0.01µF...
  • Page 8 ICF-703S SECTION 4 DIAGRAMS 4-1. PRINTED WIRING BOARDS DRY BATTERY SIZE " D " (IEC DESIGNATION R20) POWER BOARD MAIN BOARD 3PCS, 4.5V TP11 TP10 TP12 TONE T401 POWER TRANSFOMER C403 TP13 D401 C404 BPF1 D402 BLK/WHT CN401 CT1-2 FM OSC...
  • Page 9 ICF-703S 4-2. 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 W or less unless otherwise specified.

  • Page 10: Section 5 Exploded View

    Ver 1.1 SECTION 5 EXPLODED VIEW NOTE: • The mechanical parts with no reference • Color Indication of Appearance Parts The components identified by 5-2. CABINET (REAR) SECTION number in the exploded views are not supplied. mark 0 or dotted line with mark Example : •...

  • Page 11: Section 6 Electrical Parts List

    SECTION 6 MAIN ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in • Items marked “*” are not stocked since The components identified by the parts list may be different from the they are seldom required for routine service. mark 0 or dotted line with mark parts specified in the diagrams or the Some delay should be anticipated...
  • Page 12 ICF-703S MAIN POWER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-410-981-22 INDUCTOR CHIP 0.1uH < COIL > < TRANSISTOR > L401 1-410-294-11 INDUCTOR 38uH 8-729-027-60 TRANSISTOR DTC144TKA-T146 < RESISTOR > 8-729-027-60 TRANSISTOR DTC144TKA-T146 8-729-027-60 TRANSISTOR DTC144TKA-T146...
  • Page 13 ICF-703S MEMO – 17 –...

  • Page 14: Revision History

    ICF-703S REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper on the revised page you to jump to the next revised page. Ver. Date Description of Revision 2001. 09...

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