Thanks, career change forced by covid. Got laid off but since I am a disabled vet the VA is paying for me to finish my 4 year degree.
If specs don’t change, and the previous settings were in spec they should be good to go. IF specs change then yes the machine would need recalibrate to be back in spec.
Lab equipment is MUCH more sensitive and specs are often much tighter.
A simple optical scanner should not need adjusted on power up if it was in spec when shut down.
The caveat to that would be if the scanner was knocked around while powered down.