Sharp XR-41X Service Manual - Page 3
Safety Precaution, Important Service Safety Notes - dlp
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XSRA-4F0XETY PRECAUTION IMPORTANT SERVICE SAFETY NOTES Service Manual XR-40X/XR-41X/XG-F260X IMPORTANT SERVICE SAFETY NOTES (for USA) Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and servicing guidelines as follows: WARNING 1. For continued safety, no modification of any circuit should be attempted. 2. Disconnect AC power before servicing. BEFORE RETURNING THE PROJECTOR: (Fire & Shock Hazard) Before returning the projector to the user, perform the following safety checks: 1. Inspect lead wires are not pinched between the chassis and other metal parts of the projector. 2. Inspect all protective devices such as non-metallic control knobs, insulating materials, cabinet backs, adjustment and compartment covers or shields, isolation resistor-capacity networks, mechanical insulators, etc. 3. To be sure that no shock hazard exists, check for current leakage in the following manner: Plug the AC cord directly into a 120 - volt AC outlet, (Do not use an isolation transformer for this test). Using two clip leads, connect a 1.5k ohm, 10 watt resistor paralleled by a 0.15µF capacitor in parallel between all exposed metal cabinet parts and earth ground. Use an AC voltmeter with sensitivity of 5000 ohm per volt., or higher, sensitivity to measure the AC voltage drop across the resistor. All checks must be repeated with the AC plug connection reversed. (If necessary, a non-polarized adapter plug must be used only for the purpose of completing these checks.) Any reading of 0.4 volts RMS (this corresponds to 0.27 milliamp. AC.) or more is excessive and indicates a potential shock hazard which must be corrected before returning the unit to the owner. DVM AC SCALE 1.5k ohm 10W 0.15 µF TEST PROBE TO EXPOSED METAL PARTS CONNECT TO KNOWN EARTH GROUND SAFETY NOTICE Many electrical and mechanical parts in DLPR Projector have special safety-related characteristics. These characteristics are often not evident from visual inspection, nor can protection afforded by them be necessarily increased by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this manual; electrical components having such features are identified by " " and shaded areas in the Replacement Parts Lists and Schematic Diagrams. For continued protection, replacement parts must be identical to those used in the original circuit. The use of a substitute replacement parts which do not have the same safety characteristics as the factory recommended replacement parts shown in this service manual, may create shock, fire or other hazards. WARNING: The bimetallic component has the primary conductive side exposed. Be very careful in handling this component when the power is on. ii