1.
Precautions
Figure 1-1 : Leakage Current Test Circuit
4) With the unit completely reassembled, plug the AC line cord directly into a 120V AC outlet. With the unit’s AC switch
first in the ON position and then OFF, measure the current between a known earth ground (metal water pipe, conduit,
etc.) and all exposed metal parts, including: metal cabinets, screwheads and control shafts. The current measured should
not exceed 0.5 milliamp. Reverse the power-plug prongs in the AC outlet and repeat the test.
1.1.4. Product Safety Notices
Some electrical and mechanical parts have special safetyrelated characteristics which are often not evident from visual
inspection. The protection they give may not be obtained by replacing them with components rated for higher voltage,
wattage, etc. Parts that have special safety characteristics are identified by
on schematics and parts lists. A substitute
replacement that does not have the same safety characteristics as the recommended replacement part might create shock, fire
and/or other hazards. Product safety is under review continuously and new instructions are issued whenever appropriate.
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