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 Circuitage current tester or a metering system that com-
plies with American National Standards Institute
1. Before returning an instrument to the custom-(ANSI) C101.1 Leakage Current for Appliances
er, always make a safety check of the entire instru-and Underwriters Laboratories (UL) 1410, (50.7).
ment, including, but not limited to, the followingWith the instrument AC switch first in the on posi-
items:tion and then in the off position, measure from a
a. Be sure that no built-in protective devices are de-known earth ground (metal water pipe, conduit,
fective and have been defeated during servicing.etc.) to all exposed metal parts of the instrument
(1) Protective shields are provided on this chassis(antennas, handle brackets, metal cabinet, screw
to protect both the technician and the customer.heads, metallic overlays, control shafts, etc.), es-
Correctly replace all missing protective shields, in-pecially any exposed metal parts that offer an elec-
cluding any removed for servicing convenience.trical return path to the chassis. Any current
(2) When reinstalling the chassis and/or other as-measured must not exceed 0.5 milli-ampere. Re-
sembly in the cabinet, be sure to put back in placeverse the instrument power cord plug in the outlet
all protective devices, including but not limited to,and repeat the test.
nonmetallic control knobs, insulating fishpapers,
adjustment and compartment covers/shields, and
isolation resistor/capacitor networks. Do not oper-READING SHOULD
NOT BE ABOVE 0.5 mA
ate this instrument or permit it to be operated
without all protective devices correctly in-
LEAKAGE
stalled and functioning. Servicers who defeatDEVICECURRENT
TESTER
safety features or fail to perform safety checksBEING
TESTED
may be liable for any resulting damage.
b. Be sure that there are no cabinet openings throughTEST ALL EXPOSED
METAL SURFACES
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
ALSO TEST WITH
mask, (2) excessively wide cabinet ventilationPLUG REVERSED
slots, and (3) an improperly fitted and/or incorrectlyUSING AC
ADAPTER PLUG
secured cabinet back cover.EARTH
AS REQUIREDGROUND
c. Antenna Cold Check - With the instrument AC
plug removed from any AC source, connect an
electrical jumper across the two AC plug prongs.ANY MEASUREMENTS NOT WITHIN THE LIMITS
Place the instrument AC switch in the on position.SPECIFIED HEREIN INDICATE A POTENTIAL
Connect one lead of an ohmmeter to the AC plugSHOCK HAZARD THAT MUST BE ELIMINATED
prongs tied together and touch the other ohmme-BEFORE RETURNING THE INSTRUMENT TO
ter lead in turn to each tuner antenna input ex-THE CUSTOMER OR BEFORE CONNECTING
posed terminal screw and, if applicable, to theTHE ANTENNA OR ACCESSORIES.
coaxial connector. If the measured resistance is e. X-Radiation and High Voltage Limits - Because
less than 1.0 megohm or greater than 5.2 mego-the picture tube is the primary potential source of
hm, an abnormality exists that must be correctedX-radiation in solid-state TV receivers, it is special-
before the instrument is returned to the customer.ly constructed to prohibit X-radiation emissions.
Repeat this test with the instrument AC switch in
For continued X-radiation protection, the replace-
the off position.
ment picture tube must be the same type as the
d. Leakage Current Hot Check - With the instru-original. Also, because the picture tube shields
ment completely reassembled, plug the AC lineand mounting hardware perform an X-radiation
cord directly into a 120V AC outlet. (Do not use anprotection function, they must be correctly in place.
isolation transformer during this test.) Use a leak-High voltage must be measured each time servic-
1-2-1SFTY_2 |
ACEC
