Emerson 6420FE Important Safety Precautions, Safety Precautions for TV Circuit, L6115IMP

IMPORTANT SAFETY PRECAUTIONS

Prior to shipment from the factory, our products are strictly inspected for recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.

Safety Precautions for TV Circuit

1.Before returning an instrument to the custom- er, always make a safety check of the entire instru- ment, including, but not limited to, the following items:

a.Be sure that no built-in protective devices are de- fective and have been defeated during servicing.

(1) Protective shields are provided on this chassis to protect both the technician and the customer. Correctly replace all missing protective shields, in- cluding any removed for servicing convenience. (2) When reinstalling the chassis and/or other assem- bly in the cabinet, be sure to put back in place all protective devices, including but not limited to, nonmetallic control knobs, insulating fishpapers, adjustment and compartment covers/shields, and isolation resistor/capacitor networks. Do not oper- ate this instrument or permit it to be operated without all protective devices correctly in- stalled and functioning. Servicers who defeat safety features or fail to perform safety checks may be liable for any resulting damage.

b.Be sure that there are no cabinet openings through which an adult or child might be able to insert their fingers and contact a hazardous voltage. Such openings include, but are not limited to, (1) spac- ing between the picture tube and the cabinet mask, (2) excessively wide cabinet ventilation slots, and (3) an improperly fitted and/or incorrectly secured cabinet back cover.

c.Antenna Cold Check - With the instrument AC plug removed from any AC source, connect an electrical jumper across the two AC plug prongs. Place the instrument AC switch in the on position. Connect one lead of an ohmmeter to the AC plug prongs tied together and touch the other ohmme- ter lead in turn to each tuner antenna input ex- posed terminal screw and, if applicable, to the coaxial connector. If the measured resistance is less than 1.0 megohm or greater than 5.2 mego- hm, an abnormality exists that must be corrected before the instrument is returned to the customer. Repeat this test with the instrument AC switch in the off position.

d.Leakage Current Hot Check - With the instru- ment completely reassembled, plug the AC line cord directly into a 120V AC outlet. (Do not use an isolation transformer during this test.) Use a leak-

age current tester or a metering system that com- plies with American National Standards Institute (ANSI) C101.1 Leakage Current for Appliances and Underwriters Laboratories (UL) 1410, (50.7). With the instrument AC switch first in the on posi- tion and then in the off position, measure from a known earth ground (metal water pipe, conduit, etc.) to all exposed metal parts of the instrument (antennas, handle brackets, metal cabinet, screw heads, metallic overlays, control shafts, etc.), es- pecially any exposed metal parts that offer an elec- trical return path to the chassis. Any current measured must not exceed 0.5 milli-ampere. Re- verse the instrument power cord plug in the outlet and repeat the test.

READING SHOULD
NOT BE ABOVE 0.5 mA
	LEAKAGE
DEVICE	CURRENT
BEING	TESTER
TESTED	+	_
TEST ALL EXPOSED
METAL SURFACES
ALSO TEST WITH
PLUG REVERSED
USING AC		EARTH
ADAPTER PLUG
AS REQUIRED		GROUND

ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE ELIMINATED BEFORE RETURNING THE INSTRUMENT TO THE CUSTOMER OR BEFORE CONNECTING THE ANTENNA OR ACCESSORIES.

e.X-Radiation and High Voltage Limits - Because the picture tube is the primary potential source of X-radiation in solid-state TV receivers, it is special- ly constructed to prohibit X-radiation emissions. For continued X-radiation protection, the replace- ment picture tube must be the same type as the original. Also, because the picture tube shields and mounting hardware perform an X-radiation protection function, they must be correctly in place. High voltage must be measured each time servic-

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