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(b)
Maintenance
for
PC board
No maintenance
is
required
for
parts
on
PC board
under
normal
use;
when
abnormal
conditions
occur,
however,
contact
your
nearest
service
station.
When
maintenance
is
required,
note
the
following.
(i)
Electrostatic
breakdown
prevention
MCU
and
IC on
PC board
may
cause
electrostatic
breakdown;
therefore,
be
sure
to
ground
the
workbench,
soldering
iron
and human body before
handling
those
parts.
(ii)
IC
socket
When
IC
socket
is used,
do not
connect
or
disconnect
it
unnecessarily:
poor
contact
may cause
malfunctions
to
the
unit.
(c)
It
is
recommended
that
smoothing
capacitor
CB be replaced
with
a spare
one
at least
once
per
5 years
in point
of this
expected
service
life.
It
should
be noted
that
the
life
is
significantly
reduced
when
it
is
used
under
high
temperature
and heavy
load
conditions
in particular.
When
the capacitor
is
replaced
with
a capacitor
which
has
been
stored
more
than
3 years,
the
aging
is
required
under
the
following
conditions
before
use.
O)
At first,
apply voltage
of 80% of the capacitor
rated
voltage
under
normal
temperature
for one
hour.
O)
Next,
increase
the
voltage
up
to
90%
and
apply
it
under
normal
temperature
for
one
hour.
©)
Finally,
apply
the
rated
voltage
under
normal
temperature
for
5 hours.
~- 86 -
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