JVC RX-550VBK - Page 2

RX-550VBK
RX-550VLBK
Safety Precautions
1. The design of this product contains special hardware and
many
circuits
and
components
specially
for
safety
pur-
poses.
For
continued
protection,
no
changes
should
be
made
to
the
original
design
unless
authorized
in
writing
by
the
manufacturer.
Replacement
parts
must
be
identical
to
those
used
in
the
original
circuits.
Service
should
be
performed
by
qualified
personnel
only.
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.).
~
ing.
AC
VOLTMETER
(Having
1000
ohms/volt,
or
more
sensitivity.)
foe
!
0
18
xf
AC
TYPE
ie
Paes
I
:
Bi
Place
this
probe
ie
Dod
aw
+
.--1-e
on each
exposed
L
1500
&
10
W
metal
part.
Good
earth
ground
-———_
|
|
|
———___——§——_+
CHECK
THE
VOLTAGE
SELECTOR’S
SETTING
(Except
for
U.S.A.,
Canada,
Australia,
U.K.
and
Continental
Europe)
'
Before
inserting
the
power
plug,
please
check
that
the
voltage
selector’s
setting
corresponds
with
this equipment.
fs voltage selector may be Jocated on the rear or bottom of the unit, or underneath the platter.
| CAUTION
|
|
|
|
the
line
voltage
in
your
area.
If
it
doesn't
be
sure
to
reset
the
voltage
selector
before
operating
|
|
|
|
-
Before
setting
the
voltage
selector
to
the
proper
voltage,
disconnect
the
power
plug.
1-2 (No.2976)