Yamaha TX-550 - Service Personnel Guidelines; Internal Component Layout

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
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