- AL-E77BK
|
Safety Precautions
1. The design
of this product contains special hardware,
5. Leakage current check
to
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.
. 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 personal
injury or property damage resulting therefrom.
. 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 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 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 in
Service manual may create shock, fire, or other hazards.
. The leads in the products are routed and dressed with
ties, clamps,
tubings,
barriers
and/or the like to be
separated from live parts, high temperature parts, mov-
ing parts and/or sharp edges for the prevention of elec-
tric shock and fire hazard.
When service is required, the original lead routing and
dress should be observed, and they should be confirm-
ed to be returned to normal, after re-assembling.
metal part.
Good earth ground
CHECKING
YOUR
LINE VOLTAGE
(Except for U.K., Continental Europe and Australia)
Before inserting the power plug, please check this setting to see that it corresponds
with
fy4743
220V
LINE
'
the line voltage in your area. If it doesn't, be sure to adjust the voltage selector switch to
the proper setting before operating this equipment. The voltage selector switch is located
underneath the platter.
the power plug.
(Safety for electrical shock hazard)
After re-assembling
the product,
always
perform
an
isolation
check
on the
exposed
metal
parts
of the
Products
(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 mV
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 voit or more
sensitivity
in
the
following
manner.
Con-
nect a 1500 2 10 W resistor paralleled by
aO.15 pF
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 AC (r.m.s.).
This corresponds to 0.5 mA AC (r.m.s.).
FR
AC VOLTMETER
(Having 1000 ohms/volt,
or more sensitivity.)
Place this probe
on each exposed
15002
10W
1-2
(No.
2896)
