I have a Tennant 2200 36v charger. I need to change input from 408v to 220v 1ph. I moved board inside to 220v.now charger turns on for about 5 seconds then shuts down.The manual was not with charger.There are six nuts holding board in.2 are obvious but not sure about others.I tried several different places. Is there something else I need to switch for 220? Any help would be greatly appreciated.