IBM 4840-544 Service Guide - Page 55

Recalibrate

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August 3, 2006 | | | | | | | | Troubleshooting Table 7. Symptoms and actions (continued) Magnetic stripe reader (MSR) not reading. 1. Check the three-track MSR dip switch settings for either RS232 or keyboard interface. 2. Run Setup and check the setting in the MSR serial port. 3. Ensure that the MSR cable is securely connected. 4. Run the MSR test. Refer to "Running Diagnostics" on page 30. 5. Reset to factory defaults by pressing the Reset button with a paper clip. The MSR must be removed temporarily from the side of the tablet to access the reset button. Leave the MSR cable connected, and the unit powered ON when pressing the Reset button. 6. Replace the MSR. See "Magnetic stripe reader (MSR) - removing and replacing" on page 47. Operator display backlight: dark, dim, or partially lit. 1. Adjust the brightness using the button located on the front of the display. 2. Ensure operator display cable is securely attached under display tablet and at system board. 3. Replace operator display, see "Display tablet - removing and replacing" on page 48. Touch screen not working. 1. Ensure operator display cable is securely attached under display tablet and at system board. 2. Run the touch screen test. Refer to "Running Diagnostics" on page 30. 3. Reinstall touch driver. 4. Replace the operator display tablet. See "Display tablet - removing and replacing" on page 48. 5. Replace the system board. See "System board - removing and replacing" on page 65. Presence sensor not working. 1. Ensure that the LED card cable is securely connected to the system board. 2. Run the presence sensor test. Refer to "Running Diagnostics" on page 30. 3. Recalibrate the presence sensor. 4. Replace the LED board. See "LED card and cable - removing and replacing" on page 53. 5. Replace the system board. PS/2 keyboard does not work or only some keys work. 1. Ensure that only one keyboard is attached to either side or rear connectors. 2. Ensure that the keyboard cable is securely connected. 3. Move your fingers across the keys, making sure that no keys are stuck. 4. Ensure that you are on a screen that allows typing. Some screens do not allow you to type on them. 5. Run the keyboard test. Refer to "Running Diagnostics" on page 30. 6. Replace the keyboard. Compact ANPOS keyboard problem solving. 1. See Chapter 5, "Compact ANPOS Keyboard," on page 135 for CANPOS Keyboard problem solving. Chapter 3. Resolving problems 29

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Table
7.
Symptoms
and
actions
(continued)
Magnetic
stripe
reader
(MSR)
not
reading.
1.
Check
the
three-track
MSR
dip
switch
settings
for
either
RS232
or
keyboard
interface.
2.
Run
Setup
and
check
the
setting
in
the
MSR
serial
port.
3.
Ensure
that
the
MSR
cable
is
securely
connected.
4.
Run
the
MSR
test.
Refer
to
“Running
Diagnostics”
on
page
30.
5.
Reset
to
factory
defaults
by
pressing
the
Reset
button
with
a
paper
clip.
The
MSR
must
be
removed
temporarily
from
the
side
of
the
tablet
to
access
the
reset
button.
Leave
the
MSR
cable
connected,
and
the
unit
powered
ON
when
pressing
the
Reset
button.
6.
Replace
the
MSR.
See
“Magnetic
stripe
reader
(MSR)
–
removing
and
replacing”
on
page
47.
Operator
display
backlight:
dark,
dim,
or
partially
lit.
1.
Adjust
the
brightness
using
the
button
located
on
the
front
of
the
display.
2.
Ensure
operator
display
cable
is
securely
attached
under
display
tablet
and
at
system
board.
3.
Replace
operator
display,
see
“Display
tablet
–
removing
and
replacing”
on
page
48.
Touch
screen
not
working.
1.
Ensure
operator
display
cable
is
securely
attached
under
display
tablet
and
at
system
board.
2.
Run
the
touch
screen
test.
Refer
to
“Running
Diagnostics”
on
page
30.
3.
Reinstall
touch
driver.
4.
Replace
the
operator
display
tablet.
See
“Display
tablet
–
removing
and
replacing”
on
page
48.
5.
Replace
the
system
board.
See
“System
board
–
removing
and
replacing”
on
page
65.
Presence
sensor
not
working.
1.
Ensure
that
the
LED
card
cable
is
securely
connected
to
the
system
board.
2.
Run
the
presence
sensor
test.
Refer
to
“Running
Diagnostics”
on
page
30.
3.
Recalibrate
the
presence
sensor.
4.
Replace
the
LED
board.
See
“LED
card
and
cable
–
removing
and
replacing”
on
page
53.
5.
Replace
the
system
board.
PS/2
keyboard
does
not
work
or
only
some
keys
work.
1.
Ensure
that
only
one
keyboard
is
attached
to
either
side
or
rear
connectors.
2.
Ensure
that
the
keyboard
cable
is
securely
connected.
3.
Move
your
fingers
across
the
keys,
making
sure
that
no
keys
are
stuck.
4.
Ensure
that
you
are
on
a
screen
that
allows
typing.
Some
screens
do
not
allow
you
to
type
on
them.
5.
Run
the
keyboard
test.
Refer
to
“Running
Diagnostics”
on
page
30.
6.
Replace
the
keyboard.
Compact
ANPOS
keyboard
problem
solving.
1.
See
Chapter
5,
“Compact
ANPOS
Keyboard,”
on
page
135
for
CANPOS
Keyboard
problem
solving.
Troubleshooting
August
3,
2006
Chapter
3.
Resolving
problems
29
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