On the small Fender 15G/15R amps, if the power amplifier IC is bad it will immediately blow the fuse when powered. To check the the IC you have to remove it from the chassis and measure the resistance between two of its three legs. You need to find a schematic for your amp online and measure at the test points with a meter as a starting point.
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The fuse is blowing due to an overload. It's often and very likely caused by a transistor or ic that has gone short. The main culprits are the power transistors of the amp or whatever is on the big heat sink. Transistors will show the fault when you connect an ohmmeter to the terminals. It will be just like you have touched the test prods together! I don't think in your case it will be in the power supply. It's often caused by speaker cables that touch together.
The main power fuse for most amplifiers is a fast blow, 125 volt fuse for the US and a 250v fuse in countries with 220v. This unit is 125 watt so the main fuse should be 2 amps or so. The correct fuse size is written on the circuit board next to where the internal fuse was located.
A lot of Amps come with fuses as a safety mechanism so you don't blow the speaker and/or internal components in the case of a power surge etc. Check for a blown fuse. Sometimes they have a fuse holder in the back of the amp and it is labelled "fuse" which cetainly makes it easier to find. Hope this works and helps.