impact calibration 

The technical terminology for hitting any sort of electronic device to get it to work properly; a solid and punctuated smack or slap.

"Theo noticed the screen on his iPad was slightly scrambled so he quickly implemented the impact calibration principle to the edge of the device. One good smack and the screen was clear as the blue sky on a summer's day.

impact calibration by MCBassGuitar May 18, 2016