Kortek corporation
4
of
99
PDP R&D Center
1. Precautions
Follow these safety, servicing and ESD Precautions to prevent damage and protect against potential hazard such
as electrical shock and X-ray
1.1 Safety Precautions
1. Be sure that all of the built-in protective device are replaced. Restore any missing protective shields.
2. When reinstalling the chassis and its assemblies, be sure to restore all protective devices, including:
nonmetallic control knobs and compartment covers.
3. Make sure that there are no cabinet openings through which people-particuarly children ?might insert
fingers and contact dangerous voltages. Such openings include the spacing between the picture tube and
the cabinet mask, excessively wide cabinet ventilation slots, and improperly fitted back covers.
If the measured resistance is less than 1.0 megohm or greater than 5.2 megohms, and abnormality exists
that must be corrected before the unit is returned to the customer.
4. Leakage Current Hot Check(Figure. 1): Warning: Do not use an isolation transformer during this test. Use a
leakage-current tester or a metering system that complies with American National Standards Institute(ANIS
C101.1, Leakage Current for Appliances), and Underwriters Laboratories(UL Publication UL1410, 59.7).
5. With the unit completely reassembled,
plug the AC line cord directly into
the power outlet. With the unit’
s AC switch
first in the ON postion and then OFF,
measure the current between a known
earth ground(metal water pipe,Conduit,etc.)
and all exposed metal parts,including:
antennas, handle brackets,Metal cabinets,
screwheads and control shafts. The current
measured should Not exceed 0.5 milliamp.
Reverse the power-plug prongs in the AC Fig.1 AC Leakage Test
outlet and repeat the test.
6. Antenna Cold Check: With the unit’
s AC plug disconnected from the AC source, connect an electrical jumper
across the two AC prongs. Connect one lead of the ohmmeter to an AC prong. Connect the other lead to the
coaxialconnector.
Содержание P42SV
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