AccuTouch Product Guide - Elo TouchSystems

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If the system responds to the paper clip test, the touchscreen or the cabling between the touchscreen and your test point is at fault. See “Touchscreen Diagnosis” on page A-65, for further troubleshooting. Linearity. If touch data is being reported, but the system linearity is poor, the problem can be in any touch component. Do not confuse linearity problems with improper video alignment. Video alignment errors can cause progressive offsets in the reported touch location versus your actual point of touch, even in the opposite direction, but never orthogonal to the direction of movement. Random responses may be due to improper controller setup. If your problem is linearity and not video alignment or setup, investigate cables next. A cable with one drive wire (connected to pins 1, 2, 4, or 5 of the touchscreen) disconnected, or open, will produce non-linearity that gets progressively worse as you move toward the corner associated with it. This problem can be verified with an ohmmeter. See “Touchscreen Cables” on page A-75. It is also possible for a shorted transient protection component to produce the same type of symptom. Verify that all four transient suppression diodes are functional if an open in the cable cannot be found. These components fail shorted, and should be easy to spot with an ohmmeter. See “Transient Protection Components” on page A-76. If linearity is poor in several areas, and you can verify that cables are satisfactory, the touchscreen may have been damaged by lack of transient protection. See the following section, “Touchscreen Diagnosis”. Touchscreen Diagnosis The easiest way to verify touchscreen failure is by substitution. This eliminates the need to make any measurements or to concoct a dummy touchscreen. Touchscreens of any size may be driven by the same touchscreen controller. A substitute touchscreen may be used on the desktop or held up in front of the display temporarily to try to verify the source of the problem. The video alignment will normally differ for each touchscreen. Before disconnecting the original touchscreen, make sure that transient protection has not been disconnected. If nothing else is available, ground all five pins of the touchscreen that has been disconnected while you are substituting another unit. See “Transient Protection Components” on page A-76, for further details. A-65
Since the gross function of the touchscreen is that of a switch, this characteristic can be observed. Connect an ohmmeter between pin 3 and any of pins 1, 2, 4, or 5 of the touchscreen cable. This should show an open circuit (>1 megohm) when the touchscreen is not being touched, and
Page 1 and 2:
AccuTouch ® Product Manual Revisio
Page 4:
List of Figures AccuTouch Touchscre
Page 7 and 8:
6 repairing the Product or (ii) rep
Page 10 and 11: Table of Contents Chapter 1 Introdu
Page 12 and 13: Introducing Touchscreens C HAPTER C
Page 14 and 15: Care and Cleaning Handle the touchs
Page 16 and 17: C HAPTER CHAPTER 3TOUCHMONITOR INST
Page 18 and 19: Next, refer to the appropriate page
Page 20 and 21: 2210MX External Serial Controller C
Page 22 and 23: PC-Bus Controller Contents This con
Page 24 and 25: other elements that can confuse the
Page 26 and 27: C HAPTER CHAPTER 4COMPONENT INSTALL
Page 28 and 29: Getting Started AccuTouch touchscre
Page 30 and 31: Installation Steps The installation
Page 32 and 33: Discharging the CRT WARNING: Danger
Page 34 and 35: After disconnecting any necessary c
Page 36 and 37: Creating enough space between the C
Page 38 and 39: Cut and place the foam sealing tape
Page 40 and 41: Select spacers to allow the touchsc
Page 42 and 43: Figure 4.4 Side View of an AccuTouc
Page 44 and 45: Space for an internal +5 Vdc power
Page 46 and 47: Mounting the cable to the plastic c
Page 48 and 49: External Controllers Installing the
Page 50 and 51: Mounting the P/N 899389-000 cable t
Page 52 and 53: Reassembling the Monitor With the t
Page 54 and 55: Flat Panel Display Integration Whil
Page 56 and 57: A PPENDIX CHAPTER 4TROUBLESHOOTING
Page 58 and 59: Video Alignment Problems If the tou
Page 62 and 63: Touchscreen Simulation The action o
Page 64 and 65: Serial Controller The E271-2210 con
Page 66 and 67: Using the TOUCHES Utility TOUCHES i
Page 68 and 69: Some serial ports require jumpers f
Page 70 and 71: Look at the coordinates output by B
Page 72 and 73: 3000U USB Controller The 3000U cont
Page 74 and 75: DB9 and DB25 Connector Pin Position
Page 76 and 77: General Information A PPENDIX CHAPT
Page 78 and 79: 2210 Serial Controller Figure B.2 E
Page 80 and 81: 2210 Emulation Modes If you are usi
Page 82 and 83: Emulation Mode * indicates factory
Page 84 and 85: Mechanical A PPENDIX CHAPTER 4SPECI
Page 86 and 87: 1 The typical usage rate for 1 year
Page 88 and 89: Environmental Temperature/Humidity
Page 90 and 91: Contact Bounce Measured from the be
Page 92 and 93: C-97
Page 94 and 95: Introduction C HAPTER CHAPTER 2ABOU
Page 96 and 97: The logical sequence of operation o
Page 98 and 99: CHAPTER 4GLOSSARY A Autosizing-True
Page 100 and 101: Invar-Shadow Mask-A special type of
Page 102 and 103: Primary Colors-In light (and in mon
Page 104 and 105: Numerics 2201 PC-Bus Controller, 77
Page 106 and 107: J Jumper Settings, 82, 84 Jumper Se
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AccuTouch Product Guide - Elo TouchSystems

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