NCR XL15, User Manual, Page: 41 / 53

3-32 Operation and Cleaning
Resistive Touchscreen
The resistive TFT touchscreen is constructed of a hard-coated polyester top sheet that is
overlaid on a conductive-coated glass layer. Voltage is applied to the top sheet. As a user
touches the screen, the top sheet compresses and comes into contact with the glass
layer, causing current to flow to the four corners in proportion to the distance from the
edge. This controller then calculates the position of the finger, based on the current
flow. Because the controller derives both the "X" and "Y" touch coordinates from the
stable glass layer, the accuracy and operation of the touchscreen is unaffected by any
damage that may have occurred to the top sheet.
Using the Resistive Touchscreen
The resistive touchscreen functions as traditional single-touch screens.
Touchscreen Cleaning Procedures
1. Using a soft cloth dampened with isopropyl alcohol or a mild non-abrasive soap &
water solution, gently wipe the touchscreen clean.
2. Wipe the screen and edges dry.
3. Make sure the glass and screen edges dry completely before using the unit.
4. Do not use sharp objects to clean around the edges of the touchscreen