Chapter 4:
Service and Troubleshooting
Safety Reminders
Carefully
follow
these
safety
requirements
before
servicing
the
keyboards.
The
keyboard
does
not
contain
any
user
serviceable
parts
and
should
only
be
serviced
by
a
qualified
service
technician.
Before
servicing
the
keyboard,
plug
the
ground
strap
into
a
proper
grounding
outlet.
Failure
to
do
so
may
damage
it.
Also,
disconnect
the
power
cord
from
the
POS
terminal
to
which
the
keyboard
is
connected
and
disconnect
the
cables
from
the
POS
terminal
to
the
keyboard.
To
protect
the
internal
circuitry
from
damage,
unplug
the
power
cord
and
then
momentarily
press
the
power
switch
to
drain
the
power
supply
capacitance.
The
power
cord
is
used
as
the
main
disconnect
device.
Ensure
that
the
socket
outlet
is
located
or
installed
near
the
equipment
and
is
easily
accessible.
The
keyboard
should
only
be
powered
by
a
Safety
Extra
Low
Voltage
(SELV)
power
supply
source
with
an
available
power
level
of
5
amperes
or
less,
and
suitable
for
the
country
of
installation.
The
power
source
must
be
certified
by
the
appropriate
safety
agency
for
the
country
of
installation.
If
the
peripheral
does
not
have
a
fuse,
it
must
be
powered
by
an
SELV
power
supply
source.
If
the
peripheral
has
a
fuse,
replace
only
with
the
same
type
and
ratings
of
fuse
for
continued
protection
against
risk
of
fire.
4
