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XL-MS504BK
XL-M505TN
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.
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's warranty and will further relieve the manufacture
of responsibility
for personal injury or property damage resulting therefrom.
3. Many
electrical
and
mechanical
parts
in the
products
have
special
safety-related
characateristics.
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 shading on the schematics and by (A\) on the Parts
List in the Service Manual.
The use of a substitute repalcement 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, 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 retuned to normal, after re-assembling.
5
. Leakage currnet check (Electrical shock hazard testing)
After re-assembling the product, always perform and 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.
® Plug the AC line cord directly into the AC outlet.
Using a "Leakage Current Tester",
measure the leakage current from each exposed metal parts 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 1,500Q
10 W
resistor paralleled by a 0.15 »F AC-type capacitor between an exposed metal part and a
known good earth ground.
Measure
the
AC
voltage
across
the
resistor
(Having 1000 °
with the AC voltmeter.
ohmsivolts,
Move the resistor connection to each exposed
Senate Sen
metal
parts,
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 each
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.
1-2(No.20221)
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