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1. SAFETY PRECAUTION:
WARNING: Service should not be attempted by anyone unfamiliar with the
necessary precautions on this unit. The following precautions are
necessary during servicing.
1-1 Some parts, such as a picture tube in this unit, have special safety-related
characteristics for X-RAY RADIATION protection.
For continued safety, the parts replacement should be undertaken referring to below
article (1-2 and 1-5).
1-2 Many electrical mechanical parts in this unit have special safety-related characteristics
for protection against shock hazard and others. These characteristics are often passed
unnoticed by visual inspection and the protection afforded by them cannot necessarily
be obtained by using replacement components rated for higher voltage, wattage, etc.
Replacement parts which have these special characteristics are identified in the manual
and supplements by shading on the schematic diagram and the parts list. Before
replacing any of these components, read the parts list in this manual carefully.
1-3 When replacing the chassis in the cabinet, always be certain that all the protective
devices are installed properly, such as insulating covers, strain relief, etc.
1-4 Before replacing the back cover of the set, thoroughly inspect the inside of the cabinet
to see that no stray parts or tools have been left inside.
1-5 Before returning the set to the customer, always perform an AC leakage current check
on the exposed metallic parts of the cabinet, such as terminal, screwheads, metal
overlays, control shafts, etc. To insure the set is safe to operate without danger of
electrical shock, plug the AC line cord directly into a 120V AC outlet (do not use a line
isolation transformer during this check). Use an AC voltmeter having 5000 ohms per
volt or more sensitivity in the following manner. Connect a 1500 ohm, 10 watt resistor,
parallel with a (0.15uF) capacitor. Reverse the AC plug in the AC outlet and repeat the
AC voltage measurements for each exposed metallic part. Voltage measured must not
exceed 0.3V RMS. This corresponds to 0.2mA AC, any value exceeding this limit
constitutes a potential shock hazard and must be corrected immediately.
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