Safety Precautions - JVC RC-X3 Service Manual

RC-X3 B/E/G
_|2) Safety Precautions
1. The 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. 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 of the product
should not be made. Any design alterations or additions will void the manufacturer's warranty and will further
relieve the manufacturer or responsibility for personal injury or property damage resulting therefrom.
3. Many electrical and mechanical parts in the product 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, wattage, etc. Replacement parts which
have these special safety characteristics are identified in the Parts List of Service Manual. Electrical components
having such features are identified by (AA) on the schematic diagram and Parts List in Service Manual. The use
of a substitute replacement which does not have the same safety characteristics as the recommended replace-
ment part shown in the Parts List in 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 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 pro-
duct is safe to operate without danger of electrical shock.
Do not use a line isolation transformer during this check.
e 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.).
e 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 10 W resistor paralleled by a 0.15 pF AC-type capacitor
between an exposed metal part and a known good earth ground.
' ; AC VOLT
Measure the AC voltage across the resistor with the AC fa eng haa
voltmeter.
or more sensitivity.)
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
Baa gy O-
0.15 uF AC TYPE
, Place this probe
repeat each measurement. Any voltage measured must
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peracetic
not exceed 0.75 V AC (r.m.s.).
TEGO
TO aN
rae art
This corresponds to 0.5 mA AC (r.m.s.).
Good earth ground
Warning
Please note that, as a safety precaution, the wirings of the power supply sections of RC-X3 and RC-X3
B/G are different, as shown in the illustration.
PUT WIRES
INTO RIB BONDING
NOT TO FLOAT
RC-X3 B/G
(No. 1755) 3