Safety Precautions - JVC RC-EX30B Service Manual

RC-EX30
4

Safety Precautions

1. This design of this product contains special hardware and many circuits and components specially for
safety purposes. 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. Services should be performed by qualified personnel only.
2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the
product should not be made. Any design alterations or additions will void the manufacturer warranty
and will further relieve the manufacture of responsibility for personal injury or property damage
resulting there from.
3. Many electrical and mechanical parts in the products have special safety-related characteristics.
These characteristics are often not evident from visual inspection nor can the protection afforded by
them necessarily be obtained by using replacement components rated for higher voltage, the Parts
List of Service manual. Electrical components having such features are identified by shading on the
schematics and by (
replacement which does not have the same safety characteristics as the recommended replacement
parts shown in the Parts List of Service manual may create shock, fire, or other hazards.
4. The leads in the products are routed and dressed with ties, clamps, tubing, barriers and the like to
be separated 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 that they have been returned to normal, after
re-assembling.
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 parts of the cabinet, particularly and exposed metal
part having a return path to the chassis, to a known good earth ground. Any leakage current must
not exceed 0.5mA 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 1,500Ω 10W resistor paralleled by a
0.15µF 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
metal part, particularly any exposed metal part
having
measure the AC voltage across the resistor. Now,
reverse the plug in the AC outlet and repeat
each measurement. voltage measured Any must
not exceed 0.75 V AC (r.m.s.). This corresponds
to 0.5 mA AC (r.m.s.).
Warning
1. This equipment has been designed and manufactured to meet international safety standards.
2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
3. Repairs must be made in accordance with the relevant safety standards.
4. It is essential that safety critical components are replaced by approved parts.
5. If mains voltage selector is provided, check setting for local voltage.
CAUTION
2
) on the parts List in the Service Manual. The use of a substitute
the resistor connection
a return path to
Burrs formed during molding may be left over on some parts of the chassis. Therefore,
pay attention to such burrs in the case of preforming repair of this system.
to eachexposed
the chassis, and
Good earth ground
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity
0.15µF AC TYPE
Place this
probe on
each exposed
1500Ω 10W
metal part.