I had that happen on my Buck Rogers pin once, blew the fuse for the garage. All the machines in the garage were on the same circuit, i had to test each machine for shorts one at at time til i found the shorted one 

after i replaced the crook line filter on Buck, i rewired the mains fuse on it's bottom board so that it was BEFORE the line filter, just incase it happened again! (the fuse was originally wired AFTER the line filter).