That fuse is common to burn on all classic Atari games. When replacing it....make sure a good solid connection is made. I will usually solder the wire straight to the fuse block. Those "quick connect" connectors just arn't beefie enough for the power draw at that fuse. Any brittle/burnt wiring from the previous burn needs to be cut out. You must have good clean copper. I'd also pull that entire transformer assembly and check the underside. There's a bridge under there, and the bottom of that big cap......it common to have burnt wiring/connects on those, too.
Edward