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A-66 IntelliTouch/SecureTouch Guide
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 <1000 ohms when touched in
the middle of the touchscreen with firm finger pressure. A resistance of less than
5000 ohms will usually register a touch with a controller. Resistances up to 200
kilohms without a touch will cause linearity problems, as the touchscreen
system effectively averages a deliberate touch with the problem area. When
these low resistance values are observed, look for bezel contact in the active
area or damage to the cover sheet of the touchscreen.
If the bezel is touching, adjust the mounting. If damage is suspected, monitor
the resistance as described above while pulling gently on the cover sheet at the
damaged location with a piece of tape stuck to the touchscreen. The resistance
will increase to the normal open circuit value if the correct spot has been
identified. It is possible, in some circumstances, to correct touchscreen shorts
that result from damage to the cover sheet. Contact Elo Technical Support for
assistance.
There are additional resistance measurements that can reveal other problems.
Referring to Figure 2.1 on page 2-18, corner-to-corner touchscreen resistances
should be similar (within about 10%) between the following pins:
Most touchscreens will have resistances between 50 and 100 ohms. Also, the
resistances are usually proportional to the relative distances between the corners
for a particular size of touchscreen. Thus the H-Y and X-L readings are usually
larger than H-X and Y-L. Do not count on consistent resistance values from
touchscreen to touchscreen. In general, large variations in resistance pairs, or
absolute values above 120 ohms indicate a faulty touchscreen. Touchscreens
with this type of damage are not repairable.
1-2, 4-5 (H-X, Y-L)
1-4, 2-5 (H-Y, X-L)
- AccuTouch 1
- All rights reserved 2
- Trademark Acknowledgements 2
- List of Figures 4
- FCC Notice 8
- UL Notice 8
- Table of Contents 10
- Index 105 11
- NTRODUCTION 12
- Driver Software 13
- Shipping Damage 13
- Care and Cleaning 14
- Elo Entuitive Touchmonitor 15
- OUCHMONITOR 16
- NSTALLATION 16
- Touchmonitor Configurations 17
- • 2210MX serial controller 17
- • 2201 PC-Bus controller 17
- Touchmonitor Connections 17
- Contents 18
- Installation 18
- Figure 3.2 21
- PC-Bus Controller 22
- Touchscreen Application Tips 23
- Where to Go from Here 25
- OMPONENT 26
- Safety Information 27
- Work Area 27
- Protective Clothing 27
- Getting Started 28
- Figure 4.1 28
- Bezel Design 29
- Installation Steps 30
- Suggested Tools 30
- Disassembling the Display 31
- Removing the Back Case 31
- Discharging the CRT 32
- Removing the CRT 34
- Installing the Touchscreen 35
- Figure 4.3 37
- Transient Protection 41
- Figure 4.4 42
- Controller Interface Options 42
- Internal Controllers 43
- Figure 4.5 43
- External Controllers 48
- Reassembling the Monitor 52
- Sealing the Monitor 53
- ROUBLESHOOTING 56
- Display Problems 57
- Software Troubleshooting 57
- Video Alignment Problems 58
- Hardware Troubleshooting 58
- Touchscreen Diagnosis 60
- 1-2, 4-5 (H-X, Y-L) 61
- 1-4, 2-5 (H-Y, X-L) 61
- Touchscreen Simulation 62
- Figure A.1 63
- Serial Controller 64
- Using the COMDUMP Utility 64
- Byte Description 65
- Byte MSB LSB 65
- Using the TOUCHES Utility 66
- RS-232 Connections 66
- 9 7 5 3 1 67
- 10 8 6 4 2 67
- Power Supply 68
- Figure A.2 68
- Bus Controller 69
- Using the BUSSTAT Utility 69
- Touchscreen Cables 70
- Figure A.3 71
- Transient Protection Circuit 71
- Diagnostic LEDs 71
- 2210 Serial Controller 71
- 3000U USB Controller 72
- 2201 PC-Bus Controller 72
- LED Blink Rate Function 72
- LED State Function 72
- Diagnostic Codes 73
- Bit Value (hex) Description 73
- Figure A.4 74
- ONTROLLER 76
- ONFIGURATION 76
- Jumper Settings 77
- Figure B.1 77
- Figure B.2 78
- E271-2210 Serial Controller 78
- 2201PC-Bus Controller 80
- 2201Emulation Modes 82
- (From Top) 82
- Emulation Mode 82
- PECIFICATIONS 84
- Dust Seal 86
- Watertight Seal 86
- Light Transmission 87
- Environmental 88
- Temperature/Humidity 88
- Temperature 88
- Electrical 89
- Agency Approvals 90
- CE Compliance 91
- OUCHSCREENS 94
- The AccuTouch Touchscreen 95
- Figure 2.1 95
- AccuTouch Touchscreen 95
- The AccuTouch Controllers 97
- Glossary-99 98
- standard 99
- Glossary-101 100
- Glossary-103 102
- Numerics 104
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