burnt mark next to the J3

[eric lai]

Delta tau following error fatal. Controller axis 4 & 5 during motioning
we try power cycle twice to bring the unit back for temporary testing cycle
but we found the brunt mark next the J3 connector ..could you please have a look what could cause this problem ?

Delta tau part number SGBL4-F3-502-0604C23
Serial number :C000JYF7