Additionally, if the servo motor moving when there is a buzzing sound most likely motor gain is too large
Old equipment new problems you have to consider is not a crash most likely screw bending
Additionally asked the manual there is also a ringing sound
Additional
Replacement
Looking at your complementary feel is The motor receives a stepping signal, a single pulse to move only when there is a sense of noise
This is not a common situation ah ......
If the motor screw and the coupling shaft problem fast or slow should have a sound
All the sound if not buzzing? It's a little bit of a rattle, isn't it?
Look at the coupling shaft, the thing that connects the motor to the screw
You also said that it's hard to move the knife, most likely because it's loose, it's loose, the motor rotates, the pallet doesn't move
It's not a problem.