Hi ***, not sure this is which brand weigher. Is there any alarm on the operation screen?
First you can check on "Manual test page" if the Main Vibrator can work, and is not banned.
If the setting is no problem, then there maybe problem with the wire connection between Vibrator Driver and the Main Vibrator. ( Problems may exist in Driver, Wire Connection, and Vibrator) I have a doc about how to identify the problem, you can first have a look.
You can first find the related driver for the vibrator. Usually there will be 14+1 driver under control box, the other 14 is for the linear vibrator and hopper, and 1 is for the mian vibrator. [ the driver get signal and power form main control board and power supply board, you also can check this input wire if connected well]
The Driver linked to Vibrator and Power

The Driver Position

Related Files
A vibrator is unable to vibratingl#Etapack
https://www.etapack.com/document/share/4/6c190654-92ef-4a59-9b79-267021f4ab24