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27J-S100/180/260CJ27S10/26IMPORTANT <strong>SERVICE</strong> SAFETY PRECAUTION(Continued)BEFORE RETURNING THE RECEIVER(Fire & Shock Hazard)Before returning the receiver to the user, performthe following safety checks.1. Inspect all lead dress to make certain that leads arenot pinched or that hardware is not lodged betweenthe chassis and other metal parts in the receiver.2. Inspect all protective devices such as non-metalliccontrol knobs, insulating materials, cabinet backs,adjustment and compartment covers or shields,isolation resistor-capacity networks, mechanicalinsulators, etc.3. To be sure that no shock hazard exists, check forleakage current 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 to clip leads, connect a 1.5k ohm, 10 wattresistor paralleled by a 0.15µF capacitor in serieswith all exposed metal cabinet parts and a knownearth ground, such as electrical conduit or electricalground connected to earth ground.» Use an AC voltmeter having with 5000 ohm per volt,or higher, sensitivity to measure the AC voltage dropacross the resistor.» Connect the resistor connection to all exposed metalparts having a return to the chassis(antenna, metal cabinet, screw heads, knobs andcontrol shafts, escutcheon, etc.) and measure the ACvoltage drop across the resistor.AII check must be repeated with the AC line cord plugconnection reversed. (IF necessary, a non-polarizedadapter plug must be used only for the purpose ofcompleting these check.)Any current measured must not exceed 0.5 milliamp.Any measurements not within the limits outlinedabove are indicative of a potential shock hazard andcorrective action must be taken before returning theinstrument to the customer.SAFETY NOTICEMany electrical and mechanical parts in televisionreceivers have special safety-related characteristics.These characteristics are often not evident from visualinspection, nor can protection afforded by them benecessarily increased by using replacementcomponents rated for higher voltage, wattage, etc.Replacement parts which have specialsafetycharacteristics are identified in this manual; electricalcomponents having such features are identified by " å" and shaded areas in the Replacement Parts Lists andSchematic Diagrams. For continued protection,replacement parts must be identical to those used in theoriginal circuit. The use of substitute replacement partswhich do not have the same safety characteristics as thefactory recommended replacement parts shown in thisservice manual, may create shock, fire, X-radiation orother hazards.- 3 -
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