Hisense TC14FS68, Service Manual

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8. Before returning the set to your customer, always perform an AC leakage current check on the
exposed metallic parts of the cabinet, such as antennas, terminals, screwheads, metal overlays,
control shafts etc. to be sure the set is safe to operate without danger of electrical shock. Plug the
AC line cord directly into a 120V AC outlet (do not use a line isolation transformer during this
check). Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the following
manner:
Connect a 1500 ohm 10 watt resistor, paralleled by a 0.15
μ
F, AC type capacitor, between a known
good earth ground (water pipe, conduit, etc.) and the exposed metallic parts, one at a time. Measure
the AC voltage across the combination of 1500 ohm resistor and 0.15
μ
F capacitor. Reverse the
AC plug at the AC outlet and repeat AC voltage measurements for each exposed metallic part.
Voltage measured must not exceed 0.3 volts RMS. This corresponds to 0.2 milliamp. AC. Any
value exceeding this limit constitutes a potential shock hazard and must be corrected immediately.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in the chassis have special safety-related characteristics.
These characteristics are often passed unnoticed by a visual inspection and the X-RAY
RADIATION protection afforded by them cannot necessarily be obtained by using replacement
components rated for higher wattage, etc. Replacement parts which have these special safety
characteristics are identified in this manual and its supplement electrical components having such
features are shaded on the schematic diagram and the parts list.
Before replacing any of these components, read the parts list in this manual carefully. The use of
substitute replacement parts which do not have the same characteristic as specified in the parts list
may create shock, fire, X-RAY RADIATION or other hazards.