I have an older MAC PMSSC operator with speed and power boards on a Miprom hydro. The boards were all changed about 6 months ago in the operator. Now, the fuse is blowing on the power board. On test mode, when I replaced fuse, if I open the doors they have no control and go full high speed and slam. When I close the doors, the fuse on the power board blows instantly. Anyone ever had this type of issue? No prints or operator info. Thanks for any help!