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7. Keep wires away from high voltage or high tempera-
ture components.
8. Before returning the set to the customer, always
perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas,
terminals, screwheads, metal overlay, control shafts,
etc., to be sure the set is safe to operate without
danger of electrical shock. Plug the AC line cord
directly to the AC outlet (do not use a line isolation
transformer during this check). Use an AC voltmeter
having 5K ohms volt sensitivity or more in the
following manner.
Connect a 1.5K ohm 10 watt resistor paralleled by
a 0.15µF AC type capacitor, between a good earth
ground (water pipe, conductor etc.,) and the exposed
metallic parts, one at a time.
Measure the AC voltage across the combination of
the 1.5K ohm resistor and 0.15 µF capacitor. Reverse
the AC plug at the AC outlet and repeat the AC voltage
measurements for each exposed metallic part. The
measured voltage must not exceed 0.3V RMS. This
corresponds to 0.5mA AC. Any value exceeding this
limit constitutes a potential shock hazard and must
be corrected immediately.
The resistance measurement should be done between
accessible exposed metal parts and power cord plug
prongs with the power switch "ON". The resistance
should be more than 6M ohms.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this TV
receiver have special safety-related characteristics.
These characteristics are offer passed unnoticed by
visual specification and the protection afforded by them
cannot necessarily be obtained by using replacement
components rates for a higher voltage, wattage, etc.
The replacement parts which have these special safety
characteristics are identified by marks on the
schematic diagram and on 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 safety
characteristics as specified in the parts list may create
shock, fire, X-RAY RADIATION or other hazards.
Good earth
ground such as
the water pipe,
conduit, etc.
Place this
probe on each
exposed
metallic part
AC VOLTMETER
AC Leakage Current Check
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