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Now downloading free:Samsung dvd-hr775a hr773a hr776a hr777a sm

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1. Precautions 1-1 Safety Precautions 1) Before returning an instrument to the customer, Any measurements not within the limits specified always make a safety check of the entire instrument, herein indicate a potential shock hazard that must including, but not limited to, the following items: be eliminated before returning the instrument to the customer. (1) Be sure that no built-in protective devices are defective or have been defeated during servicing. (1)Protective shields are provided to protect both the technician and the customer. Correctly replace all missing protective shields, including any removed for servicing convenience. (2)When reinstalling the chassis and/or other assembly in the cabinet, be sure to put back in place all protective devices, including, but not limited to, nonmetallic control knobs, insulating fish papers, adjustment and compartment covers/shields, and isolation resistor/capacitor networks. Do not operate this instrument or permit it to be operated without all protective devices correctly installed and functioning. Fig. 1-1 AC Leakage Test (2) Be sure that there are no cabinet openings through (4) Insulation Resistance Test Cold Check-(1) Unplug which adults or children might be able to insert the power supply cord and connect a jumper wire their fingers and contact a hazardous voltage. Such between the two prongs of the plug. (2) Turn on the openings include, but are not limited to, excessively power switch of the instrument. (3) Measure the wide cabinet ventilation slots, and an improperly resistance with an ohmmeter between the fitted and/or incorrectly secured cabinet back jumpered AC plug and all exposed metallic cabinet cover. parts on the instrument, such as screwheads, antenna, control shafts, handle brackets, etc. When (3) Leakage Current Hot Check-With the instrument an exposed metallic part has a return path to the completely reassembled, plug the AC line cord chassis, the reading should be between 1 and 5.2 directly into a 230V(220V ~ 240V) AC outlet. (Do megohm. When there is no return path to the chassis, not use an isolation transformer during this test.) the reading must be infinite. If the reading is Use a leakage current tester or a metering system not within the limits specified, there is the possibility that complies with American National Standardsp of a shock hazard, and the instrument must be institute (ANSI) C101.1 Leakage Current for repaired and rechecked before it is returned to the Appliances and Underwriters Laboratories (UL) customer. See Fig. 1-2. 1270 (40.7). W



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