Sony icf c 723 service manual
This is the 17 pages manual for sony icf c 723 service manual.
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Extracted text from sony icf c 723 service manual (Ocr-read)
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Ð 2 Ð TABLE OF CONTENTS Specifications ........................................................................... 1 1. GENERAL Location and Function of Controls .................................... 3 2. DISASSEMBLY 2-1. Cabinet (Upper) Removal ........................................... 4 2-2. Microcomputer Board Removal ................................. 4 2-3. Main Board, Key Board, Transformer (Primary) Board, Transformer (Secondary) Board Removal ...... 5 Installation Power Cord ..................................................... 5 3. ELECTRICAL ADJUSTMENT ................................ 6 4. DIAGRAMS 4-1. Explanation of IC Terminal ........................................ 8 4-2. Printed Wiring Board (Microcomputer Section) ........ 9 4-3. Schematic Diagram ((Microcomputer Section) ......... 11 4-4. Printed Wiring Board (Main Section) ....................... 13 4-5. Schematic Diagram (Main Section) ......................... 15 5. EXPLODED VIEW ..................................................... 18 6. ELECTRICAL PARTS LIST ................................... 19 MODEL NO. MODEL IDENTIFICATION – Model Number Portion – Carved on lower cabinet ICF-C723 ICF-C723L US, Canadian model : AC : 120VÚ60Hz 5W AEP, UK, Italian, E, Australian model : AC : 220 Ð 230VÚ50Hz 5WSAFETY CHECK-OUT After correcting the original service problem, perform the following safety check before releasing the set to the customer : Check the antenna terminals, metal trim, ÒmetallizedÓ knobs, screws, and all other exposed metal parts for AC leakage. Check leakage as described below. LEAKAGE TEST 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 0.5mA (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 manufacturersÕ 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 ÒlimitÓ indica- tion is 0.75V, 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) AC voltmeter (0.75V) To Exposed Metal Parts on Set Earth Ground 0.15 mF 1.5k W Fig. A. Using an AC voltmeter to check AC leakage. ATTENTION AU COMPOSANT AYANT RAPPORT Ë LA SƒCURITƒ! LES COMPOSANTS IDENTIFIƒS PAR UNE MARQUE ! SUR LES DIAGRAMMES SCHƒMATIQUES ET LA LISTE DES PIéCES SONT CRITIQUES POUR LA SƒCURITƒ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIéCES SONY DONT LES NUMƒROS SONT DONNƒS DANS CE MANUEL OU DANS LES SUPPLƒMENTS PUBLIƒS PAR SONY.SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! 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. ¥ HOW TO CHANGE THE CERAMIC FILTER This model is used two ceramic filters of CF1 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. mark mark CF1 CF3 red 10.70MHz blue 10.67MHz orange 10.73MHz black 10.64MHz white 10.76MHz MarkCenter frequency
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Ð 3 Ð SECTION 1 GENERAL * * ICF-C723 : FM, AM ICF-C723L : FM, MW, LW LOCATION AND FUNCTION OF CONTROLS