[jclark]

It’s good that you are able to recognize the potential problem in this case as opposed to trying the fix the problem after it occurs. There are several preventative measures that can be applied here. First, use one common device/model even if all the functions are not required for every line. This will reduce the complexity and will allow the handhelds to be transferable between lines if you have several that need to be repaired simultaneously. A well-structured training course should be developed and given to each employee who might need to perform this work. Ideally there will be a training video, a spare handheld, and a cab to practice on. Demonstrate all functions including charging, maintaining, handling and clearing faults, etc. Allow the operator to perform all the functions as well. You may need to make special accommodations for language barriers. Maintain a training log and record each employee as they complete the course. Finally, post Work Instructions with pictures (again account for language barriers) at each station that will be using the handhelds.