Sanyo DSR-3000 Service Manual

Also see for DSR-3000: Instruction manual Instruction manual

Contents

Sanyo DSR-3000 Service Manual Manual pdf 3 page image

− 2 −SAFETY PRECAUTIONSWARNING:Service should not be attempted by anyone unfamiliar with the necessary precautions for this recording or playbackequipment. The following precautions are necessary during servicing:1. Many electrical and mechanical parts in this recorder havespecial safety-related characteristics for providing protec-tion against shock, fire and other hazards. These charac-teristics often go unnoticed in a visual inspection, and theprotection afforded by them cannot necessarily be ob-tained by using replacement components with higher rat-ings (voltage, wattage, etc.).2. Replacement parts having special safety-related charac-teristics are identified in this manual, and in the schematicdiagrams, by the symbol ! . These components havevalues that are of special significance to product safety.Should any component (identified by the symbol ) needto be replaced, use only the part designated in the partsList. Do not deviate from the specified resistance, wattage,and voltage ratings.3. Before returning the set to the customer, always perform anAC leakage current check on the exposed metallic parts ofthe cabinet, such as terminals, screwheads, metal over-lays, etc. to be sure that the set is safe to operate withoutthe danger of electrical shock, Plug the AC line cord directlyinto a 120 V AC outlet. (Do not use a line isolation trans-former during this check.) Use an AC voltmeter with asensitivity of 5000 ohms per volt (or more) as follows:Connect a 1500 ohms, 10 watt resistor, paralleled by a 0.15mfd, 150 VAC capacitor, between a known good earthground (water pipe, conduit, etc.) and the exposed metallicparts, one at a time. Measure the AC voltage across the1500 ohms resistor and 0.15 mfd capacitor combination.Reverse the AC plug at the AC outlet and repeat the ACvoltage measurements for each exposed metallic part. Themeasured voltage must not exceed 300 mVrms. Thiscorresponds to 200 μA AC. Any value exceeding this limitconstitutes a potential shock hazard and must be correctedimmediately.4. Fuse symbol marks.For CANADAUNDERWRITERS LABORATORIES StandardCAUTION "Risk of fire-replace fuse as marked"For U.S.A.Fuse rating is marked atadjacent fuse.Digital VideoRecorder