Document Camera won't focus
The Wolfvision model VZ3 neo can lose the ability to autofocus
If a Wolfvision document camera has trouble with auto focus, it can be cured with a full power cycle.
You may notice that zooming the camera in and out only results in a sharp focus in one position. The auto function feature is either inoperative, or operating incorrectly. You can fix the issue by fully powering down the document camera. Pressing the power button or retracting the arm will not work. The easiest fix is to first power down the computer, then unplug the entire rack from the wall outlet. Plug the system in, re power everything and you should find the doc cam works normally now.