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Yamaha TX-550 Service Manual page 2

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TX-550
TX-550
EQUIPMENT
AC LEAKAGE TESTER
UNDER
TEST
OR
EQUIVALENT
INSULATING TABLE
TO
SERVICE
PERSONNEL
1
.
Critical
Components
Information,
Components
having
special characteristics
are
/L
marked and must
be
replaced
with parts
having
specifications
equal
to
those
originally
installed.
2.
Leakage
Current
Measurement
(For
120
V
Model
Only).
When
service
has
been
completed,
it
is
imperative
that
you
verify that
all
exposed
conduc-
tive
surfaces are properly
insulated
from supply
circuits.
Meter
impedance
should
be
equivalent
to
1
500
ohm
shunted by
0.1
5 pF.
Leakage
current
must
not
exceed
0.5
mA.
Be
sure
to test for
leakage
with the
AC
plug
in
both
polarities.
POLARIZATION
This product
is
equipped
with
a
polarized
alternat-
ing
current
line
plug
(a
plug having
one
blade
wider than
the other
).
This plug
will
fit
into
the
power
outlet
only
one
way.
This
is
a
safety
feature.
(U,C
model
only)
WARNING: CHEMICAL
CONTENT
NOTICE!
Avoid
prolonged, unprotected contact
between
solder
and
your
skin!
When
soldering,
do
not inhale
solder
fumes
or
expose eyes
to
solder/flux
vapor!
If
you
come
in
contact
with solder or
components
located
inside
the
enclosure
of
this
product,
wash
your
hands
before handling
food.
DO NOT
PLACE SOLDER. ELECTRICAUELEC-
TRONIC
OR
PLASTIC
COMPONENTS
IN
YOUR
MOUTH
FOR ANY REASON
WHAT SO
EVER
I
The
solder
used
in
the production
of
this
product
contains
LEAD.
In
addition,
other
electrical/elec-
tronic
and/or
plastic
(where
applicable)
components
may
also contain traces
of
chemicals found by
the
California
Health
and
Welfare
Agency
(and
possibly
other
entities) to
cause cancer
and/or
birth
defects
or
other reproductive
harm.
INTERNAL VIEW
T
T
T
o
e
®
O
Tuner
circuit
board
(3)
Q
Tuner
circuit
board
(1)
©
FM
Front-end
pack
O
Tuner
circuit
board
(6)
0
Tuner
circuit
board
(4)
©
Tuner
circuit
board
(2)
0
LCD
circuit
board
0
Tuner
circuit
board
(5)
1

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