JVC UX-A4 Service Manual

UX-A4 B/E/G/GI/EN
2
1. Safety Precautions
1. The design 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
manufacture'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
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(
/\
_)on
the
schematic
diagram
and
parts
list
in
the
service
manual.
The
use
of
a
substitute
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,
mpving
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
reassembling.
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,
particulary
any
exposed
metal
part
having
a
return
path
to
the
chassis,
to
a
known
good
earth
ground.
Any
leakage current must not exposeed 0.5mA AC(r.m.s.)
AC VOLTMETER
Alternate
check
method
Fr
{Having
1000
ohms/volt,
Plug
the
AC
line
cord
directly
into
the
AC
outlet.
Use
an
AC
voltmeter
or
more
sensitivity.)
having 1,000 ohms per volt or more sensitivity in the following
manner. Connect a 1,500 ohms 10W resistor paralleled by a 0.15 F
AC
type
capacitor
between
an
exposed
metal
part
and
a
known
good
Place
this
probe
earth
ground.
Measure
the
AC
voltage
across
the
resistor
with
the
AC
:
on
each
expared
1500
2
10W
metal
part.
voltmeter.
Move
the
resistor
connection
to
each
exposed
metal
part,
particularly any exposed metal part having a return path to the Good earth ground
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 0.75V AC(r.m.s.).This corresponds to 0.5mA 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 maintaintaind.
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.
(No. 1890)

JVC UX-A4 Specifications

General

Brand	JVC
Model	UX-A4
Category	Stereo System
Language	English