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Sony ICF-C273 Service Manual
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Sony ICF-C273 Service Manual

Fm/am pll synthesized clock radio
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SERVICE MANUAL
Ver 1.0 2004.03
Sony Corporation
9-877-642-01
2004C02-1
Personal Audio Company
© 2004.03
Published by Sony Engineering Corporation
SPECIFICATIONS
Time display
12 hour
Frequency range
Band
FM
87.5-108 MHz
AM
531-1 602 kHz
Speaker
in.) dia. 8 Ω
Approx. 6.6 cm (2
5
/
8
Power output
200 mW (at 10% harmonic distortion)
Power requirements
230 V AC, 50 Hz
Dimensions
Approx. 173 x 57.2 x 133.5 mm (w/h/d)
7
3
3
(6
/
x 2
/
x 5
/
in.) incl. projecting parts and controls
8
8
8
Mass
Approx. 630 g (1 lb 6.2 oz)
Design and specifications are subject to change without notice.
FM/AM PLL SYNTHESIZED CLOCK RADIO
ICF-C273
Australian Model
Channel step
0.05 MHz
9 kHz

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Summary of Contents for Sony ICF-C273

  • Page 1 Mass Approx. 630 g (1 lb 6.2 oz) Design and specifications are subject to change without notice. FM/AM PLL SYNTHESIZED CLOCK RADIO Sony Corporation 9-877-642-01 2004C02-1 Personal Audio Company © 2004.03 Published by Sony Engineering Corporation...

  • Page 2: Table Of Contents

    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: General

    ICF-C273 SECTION 1 GENERAL This section is extracted from instruction manual. LOCATION AND FUNCTION OF CONTROLS The PRESET TUNING 3 button has a tactile dot. FM wire antenna AC power cord VOLUME There is a tactile dot beside volume to show the direction to turn up the volume.
  • Page 4 ICF-C273 * The FM frequency display is raised or lowered by a step of 0.1 MHz. Setting the Clock and Date For example, frequency 88.00 and 88.05 MHz is displayed as “88.0 1 Plug in the clock radio. MHz.” The display will flash “AM12:00” or “0:00”.
  • Page 5 ICF-C273 4 Repeat steps 2 and 3 to set the minute. Using the NAP Timer A beep sounds to confirm the time setting. (Count Down Timer) “RADIO•SOUND” appears. The NAP timer sounds the buzzer after a preset time duration. You can choose between “RADIO” and “SOUND” modes.

  • Page 6: Disassembly

    ICF-C273 SECTION 2 DISASSEMBLY 2-1. DISASSEMBLY FLOW The equipment can be removed using the following procedure. 2-2. SWITCH BOARD, 2-2. CABINET (LOWER) CABINET (UPPER) (Page 6) (Page 6) 2-4. MAIN BOARD 2-5. TRANS BOARD 2-3. ALARM BOARD, (Page 7) (Page 8)

  • Page 7: Alarm Board, Jog Board

    ICF-C273 2-3. ALARM BOARD, JOG BOARD Cabinet (upper) 4 two screws 3 cover (jog) 5 ALARM board 8 JOG baord 7 screw 6 arm (jog) 2 screw 1 two screws 2-4. MIAN BOARD 1 screw (B2.6) 2 power cord retainer board...

  • Page 8: Trans Board

    ICF-C273 2-5. TRANS BOARD 1 screw (B2.6) 2 power cord retainer board 4 TRANS board...

  • Page 9: Electrical Adjustments

    ICF-C273 SECTION 3 ELECTRICAL ADJUSTMENTS 3-1.TUNER SECTION FM FREQUENCY COVERAGE CONFIRMATION Adjust part Frequency display reading on digital AM Section 0dB=1µV voltmeter Confirmation 87.5MHz 3.0 to 4.0V BAND button : AM Confirmation 108MHz 9.5 to 10.5V Volume : MIN Put the lead-wire...

  • Page 10: Diagrams

    ICF-C273 SECTION 4 DIAGRAMS • Circuit Boards Location TRANS baord SWITCH baord MAIN baord JOG baord ALARM baord...

  • Page 11: 4-1.Ic Block Diagrams

    ICF-C273 Note: Note: 4-1. IC Block Diagrams • All capacitors are in µF unless otherwise noted. pF: µµF • X : parts extracted from the component side. 50 WV or less are not indicated except for electrolytics • : internal component.

  • Page 12: 4-2.Block Diagrams

    ICF-C273 4-2. BLOCK DIAGRAM WIRE ANTENNA FM RF IN FROT END PLL FREQUENCY SPEAKER FM IF AF IN SYNTHESIZER POWER DISCRI IC51 L2,CT3 FM RF FM TRACKING AOUT FM/AM 75kHz FE OUT FM OSC AM IF FM IN AM IF...

  • Page 13: Printed Wiring Board -Main Section (1/2)

    ICF-C273 4-3. PRINTED WIRING BOARD – MAIN SECTION (1/2) – Semiconductor Location Ref. No. Location WIRE MAIN BOARD ANTENNA D101 CN251 SPEAKER JC101 D102 D103 D104 F-10 D105 F-10 D106 D108 G-10 D109 FERRITE-BAR D110 IC51 ANTENNA D111 D112 D201...

  • Page 14: Printed Wiring Board -Main Section (2/2)

    ICF-C273 4-4. PRINTED WIRING BOARD – MAIN SECTION (2/2) – ALARM BOARD S117 ENTER/BRIGHTNESS R198 R197 R196 S115 ALARM A S116 ALARM B SWITCH BOARD (11) 1-861-136- STATION • SELECT/PRESET MAIN BOARD W503-2 W503-1 (Page 13) S103 CLOCK W500 S114...

  • Page 15: Schematic Diagram -Main Section (1/2)

    ICF-C273 4-5. SCHEMATIC DIAGRAM – MAIN SECTION (1/2)–...

  • Page 16: Schematic Diagram -Main Section (2/2)

    ICF-C273 4-6. SCHEMATIC DIAGRAM – MAIN SECTION (2/2)–...

  • Page 17: Exploded View

    ICF-C273 SECTION 5 EXPLODED VIEW NOTE : • -XX, -X mean standardized parts, so they • The mechanical parts with no reference The components identified by mark 0 may have some difference from the original number in the exploded views are not or dotted line with mark 0 are critical one.

  • Page 18: 5-2.Cabinet (Lower) Section

    ICF-C273 5-2. CABINET (LOWER) SECTION not supplied not supplied not supplied LCD101 not supplied not supplied P201 T201 The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified.

  • Page 19: Electrical Parts List

    ICF-C273 SECTION 6 MAIN ALARM ELECTRICAL PARTS LIST NOTE : • Due to standardization, replacements in the • SEMICONDUCTORS In each case, u : µ , for example : The components identified by mark 0 parts list may be different from the parts uA..
  • Page 20 ICF-C273 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C119 1-162-970-11 CERAMIC CHIP 0.01uF D204 8-719-069-54 DIODE UDZSTE-175.1B C120 1-162-970-11 CERAMIC CHIP 0.01uF D205 8-719-988-61 DIODE 1SS355TE-17 C121 1-107-826-11 CERAMIC CHIP 0.1uF C122 1-107-826-11 CERAMIC CHIP 0.1uF...
  • Page 21 ICF-C273 MAIN SWITCH Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-216-841-11 METAL CHIP 1/10W R162 1-216-833-11 METAL CHIP 1/10W R163 1-216-833-11 METAL CHIP 1/10W 1-216-825-11 METAL CHIP 2.2K 1/10W R164 1-216-833-11 METAL CHIP 1/10W 1-216-797-11 METAL CHIP...
  • Page 22 ICF-C273 SWITCH TRANS Ref. No. Part No. Description Remark < SWITCH > S101 1-771-550-11 SWITCH, TACTILE (TUNNG +) S102 1-771-550-11 SWITCH, TACTILE (TUNING -) S103 1-554-937-11 SWITCH, TACTILE (CLOCK) S104 1-771-550-11 SWITCH, TACTILE (ON/BAND) S105 1-771-550-11 SWITCH, TACTILE (OFF/ALARM RESET)
  • Page 23 ICF-C273 MEMO...
  • Page 24 ICF-C273 REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision...

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