PROBLEM TO BE SOLVED: To set which trap is judged to be normal or abnormal. SOLUTION: Check marks are inputted in check columns 41, 41,... of judged results that are desired to be regarded as abnormal out of respective diagnostic results displayed on a display screen. Also, with regard to a trap in dormant state or a trap, which is not inspected, when these traps are desired to be included in abnormal traps, check marks are inputted in check columns 42 and 42 corresponding to each of them. Thus, only the traps which have the check marks inputted are dealt with as defective traps.
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