Guys, 
  
My client has returned one ptz to me as he said the ptz doesnt work anymore and need to claim the warranty. But the ptz is out of warranty. Anyway, I had diagnosed for the whole afternoon and why found out something is wrong with the PTZ and it is weird as well. 
  
Here is what is happening to the ptz. 
  
I unscrewed and took out the head of the unit and then place it on the table, miracle happened when I turn on the power switch. It has no problem and its works as what it should be, pan, tilt, zoom, scan and so on. 
  
BUT..... 
  
as soon as I place it back into the cover, it does not work anymore. 
  
Anyone know why and can you please help me ?