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IMPORTANT SAFETY PRECAUTIONS
1. Before returning an instrument to the customer, always make a safety check of the entire instrument, including the
following items, but not limited to them.
a. Be sure that no built-in protective devices are defective and/or 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, including any removed for servicing convenience. (2) When reinstalling the chassis and/or other
assembly in the cabinet, be sure to put back in place all protective devices, including, but not limited to, non-metallic
control knobs, insulating fishpapers, adjustment and compartment covers/shields, and isolation resistor/capacitor
networks. Do not operate this instrument or permit it to be operated without all protective devices correctly
installed and functioning.
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 opening include, but are not limited to (1) spacing 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. Leakage Current Hot Check: With the instrument completely reassembled, plug the AC line cord directly into a 230V
AC outlet. (Do not use an isolation transformer during this test.) Use a leakage current tester or a metering system.
With the instrument AC, first switch ON and then OFF. Measure from a known earth ground (metal waterpipe,
conduit, etc.) to all exposed metal parts of the instrument (antennas, handle bracket, metal cabinet, screwheads,
metallic overlays, control shafts, etc.), especially any exposed metal parts that offer an electrical return path to the
chassis. Any current measured must not exceed 3.5 mA. Reverse the instrument power cord plug in the outlet and
repeat test. ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL
SHOCK HAZARD THAT MUST BE ELIMINATED BEFORE RETURNING THE INSTRUMENT TO THE
CUSTOMER.
2. Read and comply with all caution and safety-related notes on or inside the Monitor cabinet.
AC Leakage test
Device
under
test
Test all exposed
metal surfaces
3. Wire cord
Also test with
plug reversed
(using AC adapter
plug as required)
4
(Reading
should not
be above
3.5 mA)
Leakage
current
tester
+ -
Earth ground
First issue 06 /03
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