3M Dynapro ET 3200 Instruction
Replacing backlights
ET 3255 Computer HL (Hazardous Locations)
Intended Use
When properly installed using the materials provided, and
according to these instructions, this Backlight
Replacement Kit is intended to allow backlights for the
ET 3255 Computer HL to be replaced.
Warning
Read and understand all safety information in the
ET 3200 Series Computer User’s Guide and in this
document before installing and using the ET 3255
computer.
If there appears to be a conflict between information in the
ET 3200 Series Computer User’s Guide and this
document, this document takes precedence.
Warning
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK WHICH
COULD RESULT IN SERIOUS PERSONAL INJURY OR DEATH:
! This repair should be performed only by trained
personnel. Failure to perform all operations correctly
could damage the unit and invalidate the warranty.
! To ensure compliance with electrical codes and safe
operation of the computer, removal and re-installation of
the computer should be performed by a licensed
journeyman electrician who is familiar with local codes.
! Any servicing or other procedures not described in this
document are to be performed only by 3M Touch
Systems personnel.
Warning
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK WHICH
COULD RESULT IN SERIOUS PERSONAL INJURY OR DEATH:
! If the computer is in a hazardous location, it should be
removed to a non-hazardous location in a facility
suitable for repairing electronics. Before disconnecting
power and other connections and removing the unit from
its mounting, make sure that the area is free of
hazardous gases.
! Before removing the computer from its mounting,
disconnect power to the unit.
! When replacing the backlights, use the ones included
with these instructions in the Backlight Replacement Kit.
! Properly install the computer ensuring that all NEMA 4X
gaskets are clean, undamaged, and effective.
! When closing the hatch of the computer, make sure that
it closes flush and that the hatch screws do not bind
when they are attached. If the hatch is not closed
properly, the NEMA 4X seal may be compromised and
the warranty voided.
! Take care not to pinch backlight inverter wires when
reassembling and reinstalling the display plan or when
closing the computer
! Do not pull on or repeatedly bend lead wires. The wires
could break, causing backlight failure.
! Do not solder backlight leads. A thermal shock may
cause the glass part to crack and the backlight to fail.
! Do not substitute, lengthen, or cut the CCFL lead wires
on the backlights. Due to the high voltage applied at the
ends of the wires, the leads are made of high voltageresistant material.
Warning
TO REDUCE THE RISK OF FIRE OR EXPLOSION WHICH COULD
RESULT IN SERIOUS PERSONAL INJURY OR DEATH, do not use
cleaners that are flammable or combustible.
Replacing backlights ET 3255 Computer HL (Hazardous Locations)
Equipment
Caution
TO REDUCE THE RISK OF MINOR OR MODERATE INJURY FROM
CONTACT WITH CLEANING SOLUTIONS OR FLUIDS THROUGH
MEANS SUCH AS INJESTION AND SKIN CONTACT:
! Do not touch the inner surface of a damaged backlight
with bare skin. If bare skin does come in contact with the
inner surface of a backlight, immediately wash with soap
and water. There is a small amount of mercury inside
the backlights.
! Before using a cleaner, refer to the cleaner
manufacturer’s material safety data sheet and follow all
instructions and recommendations.
Caution
TO REDUCE THE RISK OF ENVIRONMENTAL CONTAMINATION
WHICH MAY RESULT IN MINOR OR MODERATE INJURY OR
CAUSE PROPERTY DAMAGE:
! Old backlights must be disposed of in accordance with
local municipal and governmental ordinances, laws, and
regulations.
! Protect backlights from strong shock or other forces that
could cause them to break. A broken backlight has the
potential for injury and should be handled with care.
! Do not look directly at a lit backlight at close proximity
and do not work for many hours exposing your eyes to
direct output from backlights. Disregarding this caution
could result in eye injury.
Caution
TO REDUCE THE RISK OF FIRE OR SMOKE, do not let paper,
cloth, or other flammable materials come in contact with
a backlight.
Materials supplied in the kit
The backlight replacement kit contains:
! 1 upper backlight
! 1 lower backlight
! 1 5/32-inch (4 mm) Allen key
! 1 grounding wrist strap
Materials and tools required
! 5/32-inch (4 mm) Allen key (supplied) or
1/4-inch flat-blade screwdriver to open the
computer
! 5/16-inch torque hex nut driver
! No. 1 Phillips torque screwdriver
! Security screwdriver, if the enclosure is secured
with security screws. A security screwdriver
option is available from 3M Touch Systems or
from your local hardware retailer.
! Cleaner and cloths designed for cleaning coated
optical glass that are neither flammable nor
combustible.
! 1 grounding strap (for assistant)
Personnel and facilities required
To complete this procedure you will need:
! Two people (each wearing a grounding strap).
! A clean, ESD-protected environment with a work
surface covered with foam pads or other suitable
material to protect the touch screen and bezel.
20008 (Rev.1.0) Page 2
Replacing backlights ET 3255 Computer HL (Hazardous Locations)
Replacing the backlights: Steps
The Backlight Replacement kit for the ET 3255
Computer HL contains two backlights: one for the top
of the display and one for the bottom. The top and
bottom backlights are not interchangeable. 3M Touch
Systems recommends replacing both backlights at the
same time.
1. Put on a grounding strap, connect to ground, and
touch a grounded object to discharge any builtup static.
Important
To prevent damage from electrostatic discharge (ESD),
wear a grounding wrist strap when working with electronic
components inside the enclosure. Follow the instructions
that come with the wrist strap.
Warning
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK WHICH
COULD RESULT IN SERIOUS PERSONAL INJURY OR DEATH, if
the computer is in a hazardous location, it should be
removed to a non-hazardous location that is suitable for
repairing electronics. Before disconnecting power and
other connections and removing the unit from its
mounting, make sure that the area is free of hazardous
gases.
5. To protect the touch screen and bezel, place the
unit in an ESD-protected environment and on a
work surface covered with ESD-dissipative foam
pads or other ESD-dissipative material.
6. See if there are security screws at the four
corners of the back of the bezel and, if there are,
remove them with a security screwdriver (for
information on getting a security screwdriver,
see “Materials and tools required”).
Security
Screws (4)
Figure 1: Locations of security screws (security
screws are not attached to all units)
7. To unlock the bezel assembly, find the latch
screw on the top of the enclosure and use the
Allen key or a flat-blade screwdriver to turn the
latch screw ¼ turn counter-clockwise, or until
you feel the enclosure open (Figure 2).
2. Make sure the area is free of hazardous gases and
then disconnect the power supply to the unit.
Warning
TO REDUCE THE RISK OF ELECTRIC SHOCK WHICH COULD
RESULT IN SERIOUS PERSONAL INJURY OR DEATH, before
removing the computer from its mounting, disconnect
power to the unit.
3. Disconnect all communication cables from the
unit.
4. Remove the unit from its mounting and, if the
computer is in a hazardous location, move it to a
non-hazardous location.
20008 (Rev.1.0) Page 3
Figure 2: Opening the computer enclosure
Replacing backlights ET 3255 Computer HL (Hazardous Locations)
8. Place the computer face down on the work bench
and open the main enclosure as far as it will go.
9. Have another person assist you by supporting the
enclosure in the open position so that it does not
tip over. Make sure that your assistant is also
wearing a grounding strap.
10. Carefully disconnect the touch screen tail
(Figure 3):
i. Using two fingers, gently pull the connector
tab towards you until it stops.
ii. Carefully pull the touch screen tail from the
connector.
11. Using a No.1 Phillips screwdriver, remove the
screw and washer from the clamp that holds the
display cable to the touch screen controller
(Figure 4).
12. Carefully disconnect the display cable connector
from the socket on the back of the display pan.
Figure 3: Disconnecting the touch screen tail
Figure 4: Disconnecting the display cable connector
13. Loosen the four nuts that secure the display pan,
and remove them. Notice that the two nuts on the
hinge side of the pan do not have washers. The
nuts on the opposite side have flat washers
(Figure 5).
20008 (Rev.1.0) Page 4
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