How do I calibrate my Cruz Reader's (R100 Series) touch screen?
If the icons and buttons on your touch screen seem unresponsive, or if an area of the screen appears to be dead, your touch screen may need re-calibration.
Note: It may take a number of attempts to complete calibration. DO NOT give up. If asked to start again, then keep going until you have success. Interrupting the process by powering off the unit can lock up the touch screen making it impossible to unlock again from the lock screen after restarting the unit. If this occurs, you will need to restore the unit to factory condition by applying a firmware update.
Begin by laying the Cruz flat on its back and finding a writing implement to use as a stylus. A closed retractable ball-point pen works well. Be as precise as possible, and be careful not to accidentally touch any other part of the screen during the calibration process or calibration will be thrown off.
Select Home > Menu > Settings > Language & Keyboard > Touch Calibration and the screen will rotate to landscape mode to begin the calibration process. Then follow the instructions in yellow in the lower center half of the screen. You will be told to touch the crosses at four positions on the screen numbered (1), (2), (3), & (4). See the images below.
Following cross #4, you will receive a calibration grade. There are a number of possible grades including: Poor, Fair, Average, Good, Excellent, and Perfect. For a better resistive touch screen experience, we recommend that you strive for a grade of Good or better, though the utility will allow you to accept less.
If successful, the "Calibration Grade, DIFF = ... calibration applied, please touch cross (5)." will be displayed. After this, the message changes to "Calibration is finished! Touch any to quit."
If not successful, the "Can't get valid calibration ..." message will be displayed and you will have to begin again at cross (1) as depicted in the image below. This can happen if you inadvertently touch any other part of the screen during the process. Simply complete the process until you get to this screen and begin again.
Note: This article applies to the Cruz Reader (R101, R102, R103) due to it's resistive screen and does not apply to other Cruz Tablets.