Replacing backlights ET 3255 Computer HL (Hazardous Locations)

Transcription

1 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. 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. 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. 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. 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.

2 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. Equipment 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 (Rev.1.0) Page 2

3 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. 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) 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. 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. 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. 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. Figure 2: Opening the computer enclosure (Rev.1.0) Page 3

4 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 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). Figure 3: Disconnecting the touch screen tail (Rev.1.0) Page 4

5 Figure 5: Removing the display pan nuts 14. Carefully slide the display pan away from the threaded studs and lift it to a vertical position, taking care not to damage the cable that connects it to the computer (Figure 6): i. Lift the hinge side of the display pan up from the threaded studs. ii. Slide the display pan away from the other two threaded studs. iii. Lift the display pan to a vertical position and have your assistant support both the display and the main enclosure. Figure 6: Sliding the display pan out and lifting it. Important When you lift the display pan, you expose the display and the interior side of the glass touch screen. The surface of the display and the glass surface of the touch screen mark easily. Do not touch or scratch these surfaces while replacing the backlights. If you do touch them and leave stains or fingerprints, clean them before you close the enclosure. See Step 25 on page Unscrew the display from the display pan, using a No. 1 Phillips screwdriver, as follows (Figure 7): i. First, remove the two screws on the right side of the display. ii. Then remove the four screws on the left side of the display (Rev.1.0) Page 5

6 Figure 7: Unscrewing the display from the display pan 16. Carefully lift the display from the display pan, taking care not to damage the backlight connector wires that still connect it to the display pan. 17. Under the display, you will see wires running from the backlights to the backlight inverter on the display pan. Disconnect the backlight connectors from the backlight inverter (Figure 8 and Figure 9). Figure 8: Disconnecting the backlight connectors Important Pay attention to the orientation of the connectors as you remove them so that later you can reinsert them correctly. Figure 9: Backlight connector fully connected and disconnected 18. Remove the display from the display pan and set the display on a clean, protected work surface with the display side down (Rev.1.0) Page 6

7 19. On the display, you will see wires that are attached to each of the backlights. Each backlight is inserted into a white plastic retaining channel. The backlights are held in place with small, darkcolored Phillips-head retaining screws. To remove a backlight: i. Remove the screw using a No. 1 Phillips screwdriver (Figure 10). ii. Using your fingers, gently pull out the backlight (Figure 11). Notice that the glass tube inside the backlight is facing the edge of the display, and that there is only one way for the backlight to fit in the retaining channel. iii. Remove the other backlight. Important! When handling a backlight, avoid touching the bulb with bare fingers. Oil from fingers will leave a deposit on the glass that will decrease the life span of the bulb.! Before inserting the new backlights, note that there is an upper backlight (labelled Up ), and a lower one (labelled Low ). The label is on the underside of the backlight. Make sure you insert the correct backlight into each retaining channel. 20. Insert the new backlights into the retaining channels, sliding them in until the holes for the backlight retaining screws line up. Note that the backlights are not interchangeable. The backlight labelled Up is the top backlight; the one labelled Low is the bottom backlight. The label is located on the side of the backlight that faces down as you slide it into the retaining channel (Figure 11). 21. Attach the backlights to the display frame with the small Phillips-head retaining screws that were removed in Step 19. Hand tighten the screws. Figure 10: Removing the screw that holds the backlight (upper backlight, in this illustration). Important Do not overtighten the screws, or you will strip the threads in the plastic backlight. 22. Re-position the display on the display pan and re-attach the backlight wire connectors to the backlight inverter on the display pan (Figure 9 on page 6 and Figure 12). Important There is only one way to insert the backlight connector. Do not force the connector if it does not fit. Backlight label "UP" or "LOW" (underneath backlight) Figure 11: Removing the backlight (upper backlight in this illustration) (Rev.1.0) Page 7

8 Figure 12: Connecting the new backlights 23. Bend the backlight wires so that they are out of the way and will not be pinched when you reassemble and reinstall the display pan and close the computer. To reduce the risk of fire or electric shock which could result in serious personal injury or death, take care not to pinch backlight inverter wires when reassembling and reinstalling the display plan or when closing the computer. 24. Attach the display frame to the display pan (see Figure 7 on page 6): i. First attach the four screws on the left side of the display. ii. Then attach the two screws on the right side of the display. iii. Tighten the screws to a torque of 5 inchpounds. 25. The back of the MicroTouch TM Near Field Imaging TM (NFI) touch screen (the surface that faces the inside of the computer) may have a special anti-reflective coating that can be damaged by commercial glass cleaners and cloths. To clean this surface, use a noncombustible, non-flammable cleaner designed for cleaning coated glass. 26. Lower the display pan to its original position and secure it with the nuts that were removed in Step 13. Make sure you use the washers with the threaded studs on the side of the display pan farther from the hinges (see Figure 5 on page 5). Tighten the nuts to a torque of 10 inch-pounds. 27. Reconnect the display cable to the connector on the back of the display pan (see Figure 4 on page 4). 28. Using a Phillips-head screwdriver, re-attach the cable and cable clamp to the controller to a torque of 5 inch-pounds (refer to Figure 4 on page 4) (Rev.1.0) Page 8

9 29. Reconnect the touch screen tail to the controller (Figure 13): i. Use two fingers to carefully pull the connector tab towards you until it stops. ii. Gently insert the touch screen tail into the connector. iii. Press the connector tab back into place. 30. Check the connectors to make sure they are properly seated and that cables are not damaged. 31. Close the bezel assembly and lock it by inserting the Allen key (or a flat-blade screwdriver) in the latch screw on the top of the enclosure, making sure that the latch screw engages the housing pin. Turn the latch screw ¼ turn clockwise or until it stops. If the bezel assembly was secured with security screws, re-install them now. 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. 32. If the front surface of the touch screen needs cleaning, use a non-combustible, non-flammable cleaner that will not corrode glass. 33. Power up the computer, check that the LCD display is operating and, if so, disconnect power again. 34. Before returning the computer to its hazardous location, make sure that the hazardous location is free of hazardous gases. 35. Return the computer to its hazardous location and re-install it in its mounting device. 36. Connect power to the computer and check again that the LCD display is operating. Figure 13: Reconnecting the touch screen tail Troubleshooting If the display does not function properly: 1. Remove the computer to a non-hazardous location. 2. Open the computer and make sure that all the connectors are properly seated and that no wires or cables were damaged during re-assembly of the computer. 3. If the display still does not function properly, contact 3M Touch Systems technical support (see Contacting 3M Touch Systems ) (Rev.1.0) Page 9

10 Contacting 3M Touch Systems For general information, service, and technical support for 3M Dynapro products, use the contact information below: Area USA and Canada Outside USA and Canada Type of service General information Customer service Technical support General information Customer service Technical support Contact information Tel (toll free)* Fax Web site Tel (toll free)* Fax Tel (toll free)* Fax Tel * Fax Tel * Fax Tel * Fax *Call between 7:30 a.m. and 5:00 p.m., Pacific Time (Rev.1.0) Page 10

11 Copyright This manual is 3M All rights reserved. Reproduction of the contents of this copyrighted manual in whole or in part, by any means, electronic or mechanical, for any purpose, without written permission of 3M Touch Systems, a subsidiary of 3M, is prohibited. Notice Given the variety of factors that can affect the use and performance of a 3M Touch Systems Product, including that solid state equipment has operation characteristics different from electromechanical equipment, some of which factors are uniquely within User's knowledge and control, it is essential that User evaluate the 3M Touch Systems product to determine whether it is suitable for User s particular purpose and suitable for User s method of application. 3M Touch Systems statements, engineering/technical information, and recommendations are provided for User s convenience, but their accuracy or completeness is not warranted. 3M Touch Systems products are not specifically designed for use in medical devices as defined by United States federal law. 3M Touch Systems products should not be used in such applications without 3M Touch Systems express written consent. User should contact its sales representative if User s opportunity involves a medical device application. Important notice to purchaser Specifications are subject to change without notice. 3M Touch Systems Products are warranted to meet their published specifications from the date of shipment and for the period stated in the specification. 3M Touch Systems makes no additional warranties, express or implied, including but not limited to any implied warranties of merchantability or fitness for a particular purpose. User is responsible for determining whether the 3M Touch Systems Products are fit for User s particular purpose and suitable for its method of production, including intellectual property liability for User's application. If a Product is proven not to have met 3M Touch Systems warranty, then 3M Touch Systems sole obligation and User s and Purchaser s exclusive remedy, will be, at 3M Touch Systems option, to repair or replace that Product quantity or to refund its purchase price. 3M Touch Systems has no obligation under 3M Touch Systems warranty for any Product that has been modified or damaged through misuse, accident, neglect, or subsequent manufacturing operations or assemblies by anyone other than 3M Touch Systems. 3M Touch Systems shall not be liable in any action against it in any way related to the Products for any loss or damages, whether non-specified direct, indirect, special, incidental or consequential (including downtime, loss of profits or goodwill) regardless of the legal theory asserted. (11/01) Edition First edition: March 2002 Document Number: (Rev. 1.0) Trademark 3M Dynapro, MicroTouch, and Near Field Imaging are trademarks of 3M (Rev.1.0) Page 11

12 3M Touch Systems 3M Optical Systems Division 800 Carleton Court Annacis Island New Westminster, BC Canada V3M 6L3 Worldwide Manufacturing Plants Austin, Texas Methuen, Massachusetts Milwaukee, Wisconsin Vancouver, BC, Canada Abingdon, UK For more information on 3M touch products, visit 3Mtouch.com or call toll-free M (Rev. 1.0)