Sony DSR-20MD(P) free download

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DSR-20MD/20MDP RMT-DS20 SERVICE MANUAL Ver. 1.1 2007.05 US Model Canadian Model DSR-20MD AEP Model Australian Model New Zealand Model DSR-20MDP Photo: DSR-20MD E MECHANISM SPECIFICATIONS ­ Continued on next page ­ DIGITAL VIDEO CASSETTE RECORDER MICROFILM 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 PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY. ATTENTION AU COMPOSANT AYANT RAPPORT А LA SЙCURITЙ! LES COMPOSANTS IDENTIFIЙS PAR UNE MARQUE 0 SUR LES DIAGRAMMES SCHЙMATIQUES ET LA LISTE DES PIИCES SONT CRITIQUES POUR LA SЙCURITЙ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIИCES SONY DONT LES NUMЙROS SONT DONNЙS DANS CE MANUEL OU DANS LES SUPPLЙMENTS PUBLIЙS PAR SONY. ­2­ SAFETY CHECK-OUT (US Model only) After correcting the original service problem, perform the following safety checks before releasing the set to the customer: 1. Check the area of your repair for unsoldered or poorly-soldered connections. Check the entire board surface for solder splashes and bridges. 2. Check the interboard wiring to ensure that no wires are "pinched" or contact high-wattage resistors. 3. Look for unauthorized replacement parts, particularly transistors, that were installed during a previous repair. Point them out to the customer and recommend their replacement. 4. Look for parts which, though functioning, show obvious signs of deterioration. Point them out to the customer and recommend their replacement. 5. Check the line cord for cracks and abrasion. Recommend the replacement of any such line cord to the customer. 6. Check the B+ voltage to see it is at the values specified. 7. 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 0.5 mA (500 microamperes). 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 lowvoltage 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) To Exposed Metal Parts on Set 0.15 µF 1.5 k AC Voltmeter (0.75 V) Earth Ground Fig. A Using AC voltmeter to check AC leakage ­3­ SERVICE