If the calibration of the screen is so bad that the buttons cannot be operated then the calibration should be reset to its default settings first.

To reset the screen to its default setting;

  • Switch off the power to the 864
  • Press and hold anywhere on the touch screen
  • Switch on the power to the 864


Then follow the instructions in the PDF document to calibrate the touchscreen.


WARNING: Any maintenance work undertaken on a James Heal instrument must be done so by a trained and competent person. Where electrical work is detailed, this should only be completed by a qualified engineer. James Heal is not responsible for damage or injury arising from work carried out by any person not qualified to do so. If in doubt, please contact James Heal or your local James Heal Agent.


If you require further support on this issue, our Service & Calibration Engineers will be able to help. Either submit a ticket here, or contact your local James Heal representative for further support.