Check out what has gone before
, Angus ... or (if you like) even this
one from Ancient Times!
Here is another that I just happen to have to hand (it is used as a general "preamble" to more detailed tasks that may be specific to the equipment in question):-
Check complete equipment with all its accessories to verify
total serviceability. Examine mains cable and plug. Inspect
fuse(s) for correct rating. Conduct electrical safety tests
as applicable. Ensure equipment is clean and ready for use.
Leave controls in normal (safe) position. Fix dated sticker.
Or, if you have plenty of time to spare ... see here
! - although (sadly) a lot of those old links are no longer valid.