Sony icf cd 825 rm service manual

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Ð 2 Ð TABLE OF CONTENTS 1. SERVICING NOTES ............................................... 2 2. GENERAL ................................................................. 4 3. DISASSEMBLY ......................................................... 6 4. ELECTRICAL ADJUSTMENTS ¥ Tuner Section .............................................................. 9 ¥ CD Section .................................................................. 11 ¥ Remote Control Section .............................................. 14 5. DIAGRAMS 5-1. Printed Wiring Boards Ð MAIN Section Ð ..................... 20 5-2. Schematic Diagram Ð MAIN Section Ð .......................... 23 5-3. Schematic Diagram Ð RECEIVER Section Ð ................. 27 5-4. Printed Wiring Boards Ð RECEIVER Section Ð ............ 28 5-5. Schematic Diagram Ð REMOTE CONTROL Section Ð ................................. 29 5-6. Printed Wiring Board Ð REMOTE CONTROL Section Ð ................................. 29 5-7. IC Pin Function Description ........................................... 34 6. EXPLODED VIEWS ................................................ 38 7. ELECTRICAL PARTS LIST ............................... 42 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 COM- POSANTS 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 PUB- LISHED BY SONY. SECTION 1 SERVICING NOTES The laser diode in the optical pick-up block may suffer electro- static break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled with care. NOTES ON LASER DIODE EMISSION CHECK The laser beam on this model is concentrated so as to be focused on the disc reflective surface by the objective lens in the optical pick-up block. Therefore, when checking the laser diode emis- sion, observe from more than 30 cm away from the objective lens.NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous ra- diation exposure. This Compact Disc player is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT label is located on the bottom exterior. Note on chip component replacement ¥ Never reuse a disconnected chip component. ¥ Notice that the minus side of a tantalum capacitor may be dam- aged by heat. CHUCK PLATE JIG ON REPAIRING On repairing CD section, playing a disc without the CD lid, use Chuck Plate Jig. ¥ Code number of Chuck Plate Jig: X-4918-255-1

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Ð 3 Ð SAFETY CHECK-OUT After correcting the original service problem, perform the follow- ing 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 0.5 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 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 0.75 V, so analog meters must have an accurate low- voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex- amples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2 V AC range are suit- able. (See Fig. A) Fig. A. Using an AC voltmeter to check AC leakage. 1.5 k W 0.15 µF AC voltmeter (0.75 V) To Exposed Metal Parts on Set Earth Ground ¥ HOW TO CHANGED THE CERAMIC FILTERS This model is used two ceramic filters of CF2, 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 one package as a spare parts. markcenter frequency red 10.70 MHz blue 10.67 MHz orange 10.73 MHz black 10.64 MHz white 10.76 MHz LASER DIODE AND FOCUS SEARCH OPERATION CHECK 1. Open the CD lid. 2. Turn on S420 as following figure. 3. Confirm that the laser diode emission while observing the ob- jecting lens. When there is no emission, Auto Power Control circuit or Optical Pick-up is broken. Objective lens moves up and down once for the focus search. Insert a precision screwdriver and push S420. laser diode emission mark CF2 CF 3 mark