Chapter 6: Hardware Service
6-3
Symptom Probable
Cause
Solution
External
Keyboard
not
working
Keylock
in
L
position
Turn
Keylock
to
another
position
Keyboard
plugged
into
workstation
Plug
keyboard
into
DynaKey
Controller
Board
Keyboard
not
powered
Possible
shorted
condition.
Power
for
USB
devices
is
controlled
by
a
USB
distribution
switch.
Speaker
not
working
Speaker
harness
not
connected
Connect
speaker
harness
to
DynaKey
Controller
Board.
MSR
not
working
MSR
card
not
oriented
properly
Ensure
that
magnetic
stripe
on
card
is
up
when
swiped.
MSR
harness
loose
or
broken
Ensure
that
the
MSR
harness
is
securely
fastened
to
the
DynaKey
Controller
Board,
and
that
none
of
the
wires
have
pulled
loose
from
the
connector.
Scanner
not
working
Scanner
not
powered
Possible
shorted
condition.
Power
for
USB
devices
is
controlled
by
a
USB
distribution
switch.
LCD
Dim/Contrast
too
Light
or
Dark
Unit
is
cold
Wait
15
minutes
for
unit
to
reach
operating
temperature
before
measuring
brightness
or
contrast.
Do
not
expose
the
unit
to
operating
temperatures
below
5
degrees
C.
Unit
is
in
direct
sunlight
For
best
display
quality,
keep
the
unit
out
of
direct
sunlight
or
other
bright
light
sources.
