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RX-550VBK
RX-550VLBK
Safety Precautions
1. The design of this product contains special hardware and
2. Alterations
of the design or circuitry of the product
should not be made. Any design alterations or additions
will void the manufacturer's
warranty
and will further
relieve the manufacturer
of responsibility for persona!
injury or property damage resulting therefrom.
3. Many
electrical
and
mechanical
parts in the product
have special safety-related characteristics. These charac-
teristics are often not evident from visual inspection nor
can the protection afforded by them necessarily be ob-
tained by using replacement components rated for higher
voltage,
wattage,
etc. Replacement
parts which have
these special safety characteristics are identified in the
Parts List of the Service Manual. Electrical components
having such features are identified by shading on the
schematics and by ( A ) on the Parts List in the Service
Manual. The use of a substitute replacement which does
not have the same safety characteristics as the recom-
mended
replacement
part shown
in the Parts List of
the Service
Manual
may
create shock,
fire, or other
hazards.
4. The leads in the products are routed and dressed with
ties, clamps, tubings, barriers and the like to be sepa-
rated from live parts, high temperature
parts, moving
parts and/or sharp edges for the prevention of electric
shock and fire hazard.
When service is required, the original lead routing and
dress should be observed, and it should be confirmed
the they have been returned to normal, after re-assembl-
5. Leakage current 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, control 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.
¢
Plug the AC line cord directly into the AC outlet.
Using
a ''Leakage
Current
Tester'',
measure
the
leakage current from each exposed metal part of the
cabinet, particularly any exposed metal part having a
return path to the chassis, to a known
good earth
ground. Any leakage current must not exceed 0.5 mA
AC (r.m.s.).
¢ 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 1,500 2
10W
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 with the
AC voltmeter.
Move the resistor connection to each exposed metal
part, particularly any exposed
metal part having a
return
path to the chassis,
and
measure
the AC
voltage across the resistor. Now, reverse the plug in
the AC outlet and repeat each measurement.
Any
voltage measured must not exceed 0.75 V ACir.m.s.).
This corresponds to 0.5 mA ACi(r.m.s.).
~
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———___——§——_+
this
equipment.
fs
voltage
selector
may
be
Jocated
on
the
rear
or
bottom
of the
unit,
or
underneath
the
platter.
| CAUTION
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1-2 (No.2976)
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