1 Did the instrument work normally before? 1.1 --Yes: go to 2; 1.2 --No: check instrument or call the supplier service engineer.
2 What or where has been changed? 2.1 Change back when we confirm we can keep it under control; 2.2 Try another way when it dosen't work ; 2.3 GO to 1.2 (check instrument or call the supplier service engineer) when the instrument is out of order yet.
I don't think it is very diffcult, I think english is very diffcult :)
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