AX-R551BK
'-Safety
Precautions----------------,
1.
The
design
of
this
product
contains special hardware and may 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 per-
formed 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
of
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 shading
on
the
schematics and by (Ll",)
on
the
Parts List
in
the
Service Manual. The use
of
a sub-
stitute
replacement which does
not
have
the
same safety characteristics
as
the
recommended replacement part 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 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 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 sensi-
tivity
in
the
following manner. Connect a
1,500
n
10
W resistor paralleled by a
0.15
I1F
AC-type capacitor be-
tween
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
volt-
age across
the
resistor. Now, reverse
the
plug
in
the
AC
outlet
and
repeat each measurement. Any voltage
measured must
not
exceed
0.75
VAC
(r.m.s.). This
corresponds
to
0.5
mA
AC
(r.m.s.).
f9
AC VOLTMETER
ETI
(Having
1000
ohms/volt,
or
more sensitivity. I
,-----t-o o-r--
0.15,.F
AC
TYPE
1 1
150011
IOW
~
Good
earth ground
Place
t~is
probe
on each
exposed
metal
ptr1:_
VVarning----------------------------------~
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.
20016)
\
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