I got a power-supply gifted by my friend. When I powered ON, the main (120V) FUSE blows up. I started by disconnecting the transformer from the control circuit and powered ON. This time the fuse is NOT BLOWN. This points to the control circuit as the source of the short.
Then I checked the bridge using the multi-meter and it looks good.
From here I don't know how to proceed...
Below is the link for the circuit