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Sony ICF-C490 Service Manual

Fm/am clock radio
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SERVICE MANUAL
Ver 1.1 2002.07
Sony Corporation
9-873-921-02
2002G0500-1
Personal Audio Company
C 2002.07
Published by Sony Engineering Corporation
SPECIFICATIONS
Time display
Australia: 12-hour system
Other countries: 24-hour system
Frequency range
FM: 87.5-108 MHz
AM: 530-1 710 kHz
Speaker
Approx. 6.6 cm ( 2
5
/
inches) dia. 8 Ω
8
Power output
120 mW (at 10 % harmonic distortion)
Power requirements
Australia: 240 V AC, 50 Hz
Other countries: 220-230 V AC, 50 Hz
For power backup: 9 V DC, one 6F22 battery
Battery life
Approx. 20 hours (for clock backup) using Sony
006P (6F22) battery
Dimensions
Approx. 200 × 94 × 113 mm (w/h/d)
(7
7
/
× 3
3
/
× 4
1
/
inches) not incl. projecting parts and
8
4
2
controls
Mass
Approx. 645 g (1 lb 6.75 oz) not incl. battery
Design and specifications are subject to change
without notice.
ICF-C490
Australian Model
FM/AM CLOCK RADIO
E Model

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Table of Contents
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  Summary of Contents for Sony ICF-C490

  • Page 1 Australia: 240 V AC, 50 Hz Other countries: 220-230 V AC, 50 Hz For power backup: 9 V DC, one 6F22 battery Battery life Approx. 20 hours (for clock backup) using Sony 006P (6F22) battery Dimensions Approx. 200 × 94 × 113 mm (w/h/d) ×...
  • Page 2: Table Of Contents

    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 PUB- LISHED BY SONY.
  • Page 3: General

    ICF-C490 SECTION 1 This section is extracted from instruction manual. GENERAL Setting the Clock To control the visibility of the display, set RADIO BUZZER RADIO BUZZER HOLD CLOCK RADIO+BUZZER BRIGHTNESS for the display to HIGH or LOW according to your preference.
  • Page 4: Disassembly

    ICF-C490 SECTION 2 DISASSEMBLY • This set can be disassembled in the order shown below. 2-1. DISASSEMBLY FLOW 2-2. CABINET (UPPER) ASSY (page 4) 2-3. MAIN BOARD (page 5) Note: Follow the disassembly procedure in the numerical order given. 2-2.
  • Page 5: Main Board

    ICF-C490 2-3. MAIN BOARD 7 screw (PTPWH3 × 8) 8 two screws (P3 × 14) qa power cord (PC1) 9 washer 0 power board 6 speker (6.6 cm) (SP1) 9 washer 5 LED board 4 antenna (wire) (W7) 2 screw (P3 × 14)
  • Page 6: Electrical Adjustments

    ICF-C490 SECTION 3 ELECTRICAL ADJUSTMENTS AM IF ADJUSTMENT 0 dB = 1 µV Adjust for a maximum reading on level meter [AM] 455 kHz Setting: BAND switch: AM AM FREQUENCY COVERAGE ADJUSTMENT MAIN board Put the lead-wire Adjust for a maximum reading on level meter...
  • Page 7 ICF-C490 Adjustment Location : – MAIN BOARD (Component Side) – AM IF Adjustment  FM Frequency Coverage Adjustment  CT1-3   CT1-2 FM Tracking Adjustment    CT1-1 AM Tracking Adjustment    CT1-4 AM Frequency Coverage Adjustment ...
  • Page 8: Diagrams

    ICF-C490 SECTION 4 DIAGRAMS 4-1. BLOCK DIAGRAM CT1-2, L2 FM TRACKING • SIGNAL PATH : FM FM RF FM/AM FRONT-END, : AM CV1-2 CT1-2 FM/AM IF AMP, DET, AGC, AF AMP FM LEAD ANTENNA TUNING FM/AM IF OUT RF IN...
  • Page 9: Note For Printed Wiring Boards And Schematic Diagram

    ICF-C490 4-2. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAM • IC Block Diagrams Note on Printed Wiring Board: Note on Schematic Diagram: IC1 CXA1019S • X : parts extracted from the component side. • All capacitors are in µF unless otherwise noted. pF: µµF •...
  • Page 10: Printed Wiring Boards

    ICF-C490 4-3. PRINTED WIRING BOARDS • Semiconductor AM FERRITE-ROD Location FM LEAD ANTENNA ANTENNA Ref. No. Location MAIN BOARD S111 BUZZER VOLUME D101 S110 D102 QUIET NORMAL LOUD BRIGHTNESS S102 (FM ANT) D103 HIGH ALARM TIME/ CLOCK SET D104 D105...
  • Page 11: Schematic Diagram

    ICF-C490 4-4. SCHEMATIC DIAGRAM • See page 9 for IC Block Diagrams. D202 ALARM TOL-50BHRBKEA -KS04 LED101 BUZZER COG314TOE1 (SINGAPORE) COG314TOA1 (AUSTRALIAN) (LED DISPLAY) D201 ALARM TOL-50BHRBKEA -KS04 RADIO C112 C113 0.01 0.01 R108 R110 AM OSC 3.3k MODE CONTROL,...
  • Page 12: Exploded Views

    ICF-C490 Ver 1.1 SECTION 5 EXPLODED VIEWS NOTE: 5-2. CHASSIS SECTION • -XX and -X mean standardized parts, so they • Items marked “*” are not stocked since they The components identified by may have some difference from the original are seldom required for routine service.
  • Page 13: Electrical Parts List

    ICF-C490 SECTION 6 ELECTRICAL PARTS LIST MAIN NOTE: • Due to standardization, replacements in the • Items marked “*” are not stocked since they The components identified by parts list may be different from the parts speci- are seldom required for routine service.
  • Page 14 ICF-C490 MAIN POWER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < COIL > R135 1-247-791-11 CARBON 1/4W 1-419-532-11 COIL, FERRITE-ROD ANTENNA (MW) R136 1-216-833-11 METAL CHIP 1/10W * L2 1-422-320-11 COIL, AIR-CORE R138 1-247-791-11 CARBON...
  • Page 15 ICF-C490 POWER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < TRANSISTOR > Q301 8-729-216-22 TRANSISTOR 2SA1162-G < RESISTOR > R301 1-216-845-11 METAL CHIP 100K 1/10W R305 1-247-741-11 CARBON 1/2W < TRANSFORMER > 0 T301 1-435-961-21 TRANSFORMER, POWER...
  • Page 16 ICF-C490 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 2002.04...