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RX-508VBK
RX-509VTN
Safety Precautions
5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling the product, always perform an isolation check on the exposed
metal
parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack,
contorl shafts, etc.) to be sure the product is safe to operate without danger of electrical
shock.
Do not use a line isolation transformer during this check.
@ Alternate check method
Plug the AC line cord directly into the AC outlet.
Use an AC voltmeter
having,
1,000
ohms
per volt or more
sensitivity in the following
manner.
Connect
a 1,5002
10 W
resistor paralleled by a 0.15 uF AC-type capacitor between
an exposed
metal
part and a
known good earth ground.
Measure
the
AC
voltage
across the
resistor
(Having 100°"
with the AC voltmeter.
ohms/volts,
Move the resistor connection to each exposed
DE More: sensitivity.)
metal part, particularly any exposed metal part
having
a
return
path
to
the
chassis,
and
meausre
the AC
voltage
across
the resistor.
Now,
reverse
the plug in the AC
outlet
and
Place this
probe on
repeat
each
measurement.
Any
voltage
each exposed
measured must not exceed 0.75 V AC (r.m.s.).
TRGOR TOW:
metal part.
This corresponds to 0.5 mA AC (r.m.s.).
Good earth ground
Warning
1-2(No. 20376)
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