On our QSP-2, the Y axis belts start to vibrate during the process so we need to open the doors to stop this because of the humming sound. What can creates this knowing that all the movements and placement are spot on?
1. Check for anything worn out...possibly idler bearing/pulley and/or the belt. 2. Maybe it could use servo tuning...this may help but usually servo tuning is not that critical. 3. Clean the scale and the read head if you can get to it. 4. You could always swap y axis amps.
The amp is mounted on the back side and is black. 4 total mounted for x and y axis.....swap the 2 that are y axis amps. If you have never servo tuned before on a quad machine you not going to be able to do it. There is way to many things that you need to know. It takes me an hour just to remember all the hidden keys to open up the screens correctly.