Sony icf c 773 service manual
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Extracted text from sony icf c 773 service manual (Ocr-read)
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ICF-C773/C773L 2 TABLE OF CONTENTS Specifications ........................................................................\ .... 1 1. GENERAL Location and Function of Controls .................................. 3 2. DISASSEMBLY 2-1. Disassembly Flow .................................................. 4 2-2 Cabinet (Lower). .................................................... 4 2-3. Power Board ........................................................... 5 2-4. Foot Sub Assy ........................................................ 5 2-5. Cabinet (Rear) Sub Assy ........................................ 6 2-6. Side Panel (L), Side Panel (R) ............................... 6 2-7. Cabinet (Front) Sub Assy ....................................... 7 2-8. Reflector (L), Reflector (R) ................................... 7 2-9. LCD Board ............................................................. 8 3-10. Main Board ............................................................ 8 3. ELECTRICAL ADJUSTMENTS ............................... 9 4. DIAGRAMS 4-1. Printed Wiring Board – Main section – .................. 11 4-2. Schematic Diagram – Main Board (US/CND, IT) (1/2) section– ........... 12 4-3. Schematic Diagram – Main Board (US/CND, IT) (2/2) section– ........... 13 4-4. Schematic Diagram – Main Board (AEP/UK) (1/2) section– ................. 14 4-5. Schematic Diagram – Main Board (AEP/UK) (2/2) section– ................. 15 4-6. Printed Wiring Board – Key, LCD Board section – 16 4-7. Schematic Diagram – Key, LCD Board section– .. 17 4-8. Printed Wiring Board – Power Board – ................. 18 4-9. Schematic Diagram – Power Board – .................... 19 4-10. Circuit Board Location ........................................... 20 4-11. IC Pin Function Descriptions ................................. 22 5. EXPLODED VIEW ..................................................... 23 6. ELECTRICAL PARTS LIST ................................... 25 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 PA RT NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY. - HOW TO CHANGE THE CERAMIC FILTER This model is used two ceramic filters of CF2 and CF3. 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 package as a spare parts. SAFETY CHECK-OUT After correcting the original service problem, perform the following safety checks before releasing the set to the customer: Check the antenna terminals, metal trim, metallized knobs, screw\ s, and all other exposed metal parts for AC leakage. Check leakage as described below. LEAKAGE The AC leakage from any exposed metal part to earth Ground and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microampers). Leakage current can be measured by any one of three methods. 1. A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers instructions to use these instruments. 2. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job. 3. Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC voltmeter. The limit indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A) Fig. A. Using an AC voltmeter to check AC leakage. ATTENTION AU COMPOSANT AYANT RAPPORT À LA SÉCURITÉ!! LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY. 0.15 µF To Exposed Metal Parts on Set 1.5kΩ AC voltmeter (0.75V) Earth Ground mark mark CF3 CF2 no mark blue orange black white 10.70MHz 10.67MHz 10.73MHz 10.64MHz 10.76MHz Mark Center frequency
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ICF-C773/C773L 3 SECTION 1 GENERAL LOCATION AND FUNCTION OF CONTROLS This section is extracted from instruction manual. LIGHT STANDBY LIGHT CONTROL BRIGHTNESS HIGH LOW TUNEMODE LIGHTON/OFFLIGHTSLEEP NAPSLEEP TUNE/TIMESET WAKE UP PRESET RADIO SLEEP MHzkHz STANDBYRADIO A SOUND LIGHT SLEEP RADIO B SOUND NAP ALARM MODE VOLUME D.T.S./ CLOCK ALARM B ALARM A BAND ALARM RESET RADIO OFF RADIOON ENTER *There is a tactile dot beside VOLUME to show the direction to turn up the volume.AC power cord * Unleaded solder Boards requiring use of unleaded solder are printed with the lead free mark (LF) indicating the solder contains no lead. (Caution: Some printed circuit boards may not come printed with the lead free mark due to their particular size.) : LEAD FREE MARK Unleaded solder has the following characteristics. -Unleaded solder melts at a temperature about 40°C higher than ordinary solder. Ordinary soldering irons can be used but the iron tip has to be applied to the solder joint for a slightly longer time. Soldering irons using a temperature regulator should be set to about 350°C. Caution: The printed pattern (copper foil) may peel away if the heated tip is applied for too long, so be careful! -Strong viscosity Unleaded solder is more viscous (sticky, less prone to flow) than ordinary solder so use caution not to let solder bridges occur such as on IC pins, etc. -Usable with ordinary solder It is best to use only unleaded solder but unleaded solder may also be added to ordinary solder.