Hello Daewoo techs. I have a Puma 200 that was running ok , then it tripped the breaker on the machine. I have tried to disconnect the main spindle, the axis motors and I still got a hard short in the line. When I disconnect the MDS power unit, the machine turns on. Has anyone ever had this problem? could it be that the power unit is bad? Or am I not checking the line correctly. I am new at this and could use some help. The power unit is MDS-B-CV-185. Only when I disconnect the 2L1, 2L2 and 2L3 power lines from the unit, the machine turns on. When I disconnected the spindle and axis motors, I disconnected the motors and the units in the cabinet. I did this to see if maybe one of the two were the reason for the short. Please help.