Touchscreen And Touchscreen Cables; Figure A-1. Transducer And Wedge Assembly - Elo TouchSystems IntelliTouch Ultra Product Manual

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Appendix A - Troubl Appendi

Touchscreen and Touchscreen Cables

Touchscreen and Touchscreen Cables
x A - Troubleshooting eshooting Guide Guide
If the touchscreen and its attached cable are easily accessible, the touchscreen can If the touchscreen and its attached cable are easily accessible, the touchscreen can
be physically inspected for damage to the transducers and cable. Gently peeling be physically inspected for damage to the transducers and cable. Gently peeling
back the tape covering the transducer and wedge assembly will allow you to see back the tape covering the transducer and wedge assembly will allow you to see
the back side of the transducer and the wires soldered to it (see Figure A-1). the back side of the transducer and the wires soldered to it (see Figure A-1).
Broken wires near the transducers should be obvious, but broken or cracked Broken wires near the transducers should be obvious, but broken or cracked
transducers may be difficult to see. Transducer breaks, regardless of the cause, transducers may be difficult to see. Transducer breaks, regardless of the cause,
mostly occur at the edge of the solder connection. A break can generally be mostly occur at the edge of the solder connection. A break can generally be
detected by the controller power-on diagnostics. See detected by the controller power-on diagnostics. See

Figure A-1. Transducer and Wedge Assembly

Figure A-1. Transducer and Wedge Assembly
You cannot repair a broken transducer in the field. Return any touchscreen with a You cannot repair a broken transducer in the field. Return any touchscreen with a
broken transducer to Elo for repair or replacement. If you need to repair a broken broken transducer to Elo for repair or replacement. If you need to repair a broken
wire at the solder connection to the transducer, use only a fine-tip soldering iron wire at the solder connection to the transducer, use only a fine-tip soldering iron
with temperature controls, and work at 500 with temperature controls, and work at 500
silver-bearing solder to make the new connection, but avoid long dwell times on silver-bearing solder to make the new connection, but avoid long dwell times on
the transducer electrode to minimize leaching of the metal. the transducer electrode to minimize leaching of the metal.
Field repair of broken cables is not recommended; the wires are difficult to work Field repair of broken cables is not recommended; the wires are difficult to work
with and replacement connector receptacles and housings are not commonly with and replacement connector receptacles and housings are not commonly
available. available.
If an oscilloscope is available, Test Point #1 on any controller can be used to If an oscilloscope is available, Test Point #1 on any controller can be used to
display the amplified receive waveforms from the touchscreen. The location of display the amplified receive waveforms from the touchscreen. The location of
Test Point #1 (TP1) as well as trigger points for X and Y are shown for each Test Point #1 (TP1) as well as trigger points for X and Y are shown for each
controller in Appendix C. A sample waveform is shown in Figure A-2. controller in Appendix C. A sample waveform is shown in Figure A-2.
Analysis of these waveforms (one for X and one for Y) is helpful when Analysis of these waveforms (one for X and one for Y) is helpful when
diagnosing touch sensitivity and intermittent operation problems. If the waveform diagnosing touch sensitivity and intermittent operation problems. If the waveform
you see is similar to that of Figure A-2, but the amplitude is substantially reduced you see is similar to that of Figure A-2, but the amplitude is substantially reduced
over some portion of the waveform, something may be attenuating the surface over some portion of the waveform, something may be attenuating the surface
Diagnostic Codes Diagnosti c Codes
F or less. It is not necessary to use F or less. It is not necessary to use
° °
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