Elo TouchSystems IntelliTouch SecureTouch manual Remove the CRT

Page 27

Remove the CRT

Removal of the CRT is next. Prepare a soft surface to set the CRT on. Remove the screws attaching the CRT to the bezel, and then remove the CRT. Do not lift or carry the CRT by the neck or yoke assembly. Avoid contact with the anode button, which may still have some residual charge on it, (you may wish to discharge it again at this point). Set the CRT on the prepared surface.

Several other preliminary compatibility requirements should now be assessed:

•Position the CRT so the face is accessible, providing a soft cushion for the neck and the yoke if they must rest on the work surface. Alternatively, set the CRT face-up in an office-type plastic waste basket, making sure that the tube is not resting on the neck (The small thin part of the CRT is the neck). Place the touchscreen on the face of the tube, and check to see that the face of the CRT and touchscreen are about the same size, and that the radius of curvature (ROC) of each surface matches well. If both of these conditions are not met, you may not have the proper touchscreen for the display. Most color displays have standard size CRT's with standard ROC's, and Elo has touchscreens for most of them.

•Next, determine if the touchscreen will fit in the bezel without modifications to the bezel. Modifications, if necessary, should be done without compromising the mechanical integrity of the display.

•Lay the touchscreen face-down in the bezel, being careful not to damage the transducers. Leave the degaussing coil in place, if present. The degaussing coil is a hoop, often located between the CRT and bezel, approximately

0.25-inch (6 mm) thick, with a two-wire cable and connector. The coil was probably unplugged from the power supply earlier.

If the touchscreen will not fit flush against the lip of the bezel, do not force it. An interference fit between the edge of an IntelliTouch touchscreen and some of the plastic ribs found in display bezels can pinch and break the small wires which carry the signals along the edges of the touchscreen or even result in fracture of the glass after reassembly.

It may be necessary to cut these ribs and struts inside the bezel. Cutting these ribs and struts does not usually cause difficulties although the stiffness of the bezel may be reduced slightly. Try not to cut into the posts for the CRT attachment screws. Bezel and tube combinations that require this cut are rare.

Generally, a total clearance between the edge of the touchscreen and any ribs or struts of at least 0.25-inch (6 mm) in both axes is necessary. This prevents the interference fit problem discussed above and allows for variation in touchscreen mounting position.

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Contents Page Elo IntelliTouch /SecureTouch Touchscreen Guide Disclaimer Page Intellitouch 10-YEAR Warranty Page Table of Contents Index List of Figures Viii List of Tables Page Introduction Intellitouch TechnologyIntelliTouch Touchscreen IntelliTouch TouchscreenIntelliTouch controller IntelliTouch ControllerAgency Approvals Driver SoftwareWork Area Safety InformationGetting Started Design Considerations for CRTs and LCDsProtective Clothing Bezel design Bezel DesignCRT Integration Safety InformationSuggested Tools Definition of TermsTypical IntelliTouch Touchscreen Installation Summary of Installation StepsUnpacking the Touchscreen Testing the MonitorIncoming Inspection Disassembling the MonitorDischarge the CRT Remove the Back CaseRemove the Electronic Chassis 14I n t e l l i T o u c h / S e c u r e T o u c h G u i d e Remove the CRT Verify Touchscreen Fit Page Attaching the Touchscreen Proper placement of adhesive tape to the touchscreen Spacing the CRT from the Bezel Installing the Controller Touchscreen Cabling System for Internal Serial Controller Internal Serial Controller 2500SP4 Pins Signal Function 24I n t e l l i T o u c h / S e c u r e T o u c h G u i d e External Serial Controller 26I n t e l l i T o u c h / S e c u r e T o u c h G u i d e Internal USB Controller 2500U Internal USB Controller 2500U28I n t e l l i T o u c h / S e c u r e T o u c h G u i d e Reassembling the Monitor Routing the Touchscreen CablesProper Sealing Improper Sealing Sealing the MonitorSealing Material Selection System EvaluationProper Bezel Mounting Improper Bezel Mounting LCD Integration Unpacking the Touchscreen Definition of Terms Disassembling the LCD MonitorTools and Equipment Required Parts for Serial ConnectionRequired Parts for USB Connection Optional Parts for USB Connection Optional Parts for Serial ConnectionRemoving the LCD Removing the Rear CaseDetermining Touchscreen Fit Mounting the Touchscreen Attaching double-sided adhesive tape to the touchscreen Spacing the LCD from the Bezel Sealing10 2500S Internal Serial Controller 11 2500U USB controller Parasitic Tap of 5Vdc Power12 DC to DC converter Parasitic Tap of 7-30Vdc DC to DC converterModifying the Case for USB Output Modifying the Case for Serial Output13 Horizontal escutcheon plate Re-assembling the Display48I n t e l l i T o u c h / S e c u r e T o u c h G u i d e Troubleshooting Process Troubleshooting GuideSoftware Troubleshooting Display ProblemsVideo Alignment Problems Hardware TroubleshootingSerial Controller Using the Comdump UtilityByte Byte DescriptionP2 Pins DB25 Host Signal SourceRS-232 Connections Power Connections Touchscreen and Touchscreen Cables Figure A.2 Transducer and Wedge AssemblyIC1 Cable EC2 Cable2x6 Male Header DB9 Male Function IntelliTouch Serial Controllers Diagnostic LEDsDiagnostic Codes IntelliTouch Serial Controller 2500SAA Bit Value hex Description Figure A.4 DB9 and DB25 Connector Pin Positions DB9 and DB25 Connector Pin PositionsSpecifications Environmental IntelliTouch TouchscreensMechanical OpticalUL Compliance Fire Retardation FCC Compliance Agency ApprovalsPhysical Characteristics IntelliTouch 2500U USB ControllerElectrical Touchscreen Connector Power Connector, P4 P2 pin number Signal name Standard wire color Signal name P4 pin Signal function Signal name P3 pin Signal functionLED State Function LED Diagnostic CharacteristicsAgency Approvals LED Blink Rate FunctionFigure B.4 2500U USB Controller, top view 2500U USB Controller DrawingsFigure B.6 2500U USB Controller, bottom-view Environments IntelliTouch 2500S Serial Controller72I n t e l l i T o u c h / S e c u r e T o u c h G u i d e Parameter Value Applicable Signals EIA-232 subsec Signal Name DB-9 P2 pin Sourced by Signal FunctionBoard mounted Cable applied Header Plug Jumper Function Jumper Settings76I n t e l l i T o u c h / S e c u r e T o u c h G u i d e Figure B.11 2500S Serial Controller, top view DrawingsFigure B.13 2500S Serial Controller Part Number Description ELO Part NumbersCables Stylus 82I n t e l l i T o u c h / S e c u r e T o u c h G u i d e Glossary Page Glossary-85 Page Glossary-87 Vertical Refresh Rate-See Refresh Rate Index Page Page
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