I have a Solapix 7 that is giving me some issues...
On start up, there is an evident zoom error. The head seems to have trouble zooming "out" (away from the fixture) and there is a somewhat loud noise and shaking. Once the start up cycle ends, I get a "Error Channel Zoom Coarse", as you would expect. However, at this point, everything works perfectly. Running the self test, it zooms out and in without any issue. It zooms smoothly and responds as it should.
Here are a couple videos of what it is doing during start up and then self test.