Sony cfm a 50 service manual
This is the 22 pages manual for sony cfm a 50 service manual.
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Extracted text from sony cfm a 50 service manual (Ocr-read)
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Ð 2 Ð Specifications ........................................................................... 1 1. GENERAL Location and Function of Controls .................................... 3 2. DISASSEMBLY 2-1. Cabinet (Rear) Removal ............................................. 4 2-2. ISS SW Board, Battery Case, BATTERY Board, POWER Board Removal ............. 4 2-3. Main Board, TUN LED Board, TACT SW Board Removal ........................................ 5 2-4. H/P JACK Board, Door Ear (PH), Box Ear (PH) Removal ............................................... 5 2-5. Mechanism Deck, DECK CONTROL Board Volume Board Removal .............................................. 6 3. DIAL POINTER SETTING ......................................... 7 4. ADJUSTMENTS 4-1. Mechanical Adjustment .............................................. 8 4-2. Electrical Adjustment ................................................. 8 5. DIAGRAMS 5-1. Schematic Diagram (AEP,UK Model) ...................... 12 5-2. Printed Wiring Boards (AEP,UK Model) ................. 15 5-3. Printed Wiring Boards (US Model) .......................... 19 5-4. Schematic Diagram (US Model) .............................. 23 6. EXPLODED VIEWS 6-1. Cabinet (Rear) Section .............................................. 28 6-2. Cabinet (Front) Section ............................................ 29 6-3. Mechanism Deck Section-1 (MF-A50-117) ............. 30 6-4. Mechanism Deck Section-2 (MF-A50-117) ............. 31 7. ELECTRICAL PARTS LIST .................................... 32 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. TABLE OF CONTENTS HOW TO CHANGED THE CERAMIC FILTERS This model is used three ceramic filters of CF2, CF4 and CF3. You must used same type of color marked ceramic filters in order to meet same specifications. Therefore, the ceramic filter must changed three pieces together since it's supply three pieces in one package as a spare parts. MarkCenter fequency red blue orange black white10.70MHz 10.67MHz 10.73MHz 10.64MHz 10.76MHz mark mark CF2, 4 CF3
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– 3 – SECTION 1 GENERAL LOCATION AND FUNCTION OF CONTROLS This section is extracted from instruction manual. 1FM telescopic aerial 2Carrying handle 3Dial scale 4@ (earphone) jack (mini jack) 5LIGHT (Dial scale light) button 6Tape operation buttons 7EARPHONE POCKET box 8SLOW PLAYBACK button 9Cassette compartment lid !ºFrequency marker !¡OPR/BATT indicator !™EASY LISTENING ADJUSTMENT switch !£EASY LISTENING ADJUSTMENT control !¢BAND switch !∞TUNING control !§VOLUME control !¶FUNCTION switch !-Built-in microphone !ªSpeaker 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, metallized 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 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 0.75V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a pas- sive 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 F µ 1.5kΩ Fig. A. Using an AC voltmeter to check AC leakage.