Not sure what scalp is. The feed rollers and belts are good. I re-calibrated it after i put the right blade in. I know people were using the wrong blade for a while cause its all we had. And we had people using it that werent trained for it and they adjusted the settings. Ive gone through everything a couple of times just to make sure. Thats why i think it needs to go to the shop cause i think they damaged the internals of the machine. We use it for work perposes and the training on it was regulated, but not strickly.