FANUC system alarm 401 how to solve? Already determined is amplifier fault, and exclude amplifier module, floor should be good

FANUC system alarm 401 how to solve? Already determined is amplifier fault, and exclude amplifier module, floor should be good
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How to swap?
1. A bad for good, good to change bad, good or bad appear alarm?
2. Good in the good, the bad in a bad, two cases the police?
To hear you say so, can eliminate the problem of the parameter is set up.
Check the power supply before changing unit of over 24 V, if 24 V appear problem, change into good may also take the good is burnt out. Has this alarm, lead to the alarm of reason not just servo amplifier or cable.
Eliminate not the words suggest contact Beijing fanuc the on-site service solution. Sure they present it usually within half a day to go to the site.
Cross-examine me is the bad on the amplifier module, a change to the floor on the good results, is normal, and finally ?