Electronic devices that run on direct current (DC) often require an adaptor to transform the voltage from the standard 120-volt outlets common in the United States. As further protection against a power surge, DC adaptors are often equipped with a fuse gauged to burn out if the amperage exceeds a predetermined level. Once the fuse is blown, the DC adaptor no longer works. To repair the adaptor, you'll need to open the fuse compartment and switch out the blown part for a new fuse.
Unplug the adaptor from the electronic device and the wall outlet.
Slide off or twist apart the fuse compartment, which is often located in the cord. Look for a tube-shaped bump in the adaptor cord.
Pull up on the middle of the fuse body mounted inside the two spring clips to remove it. The fuse is usually a tube-type made of clear glass with cylindrical metal caps on the ends. On assemblies with a twist-off cap, remove the cap from the end of the fuse and pull the blown fuse from the chamber.
Insert a fuse rated identically to the old fuse. For example, replace a 20 amp fuse only with a 20 amp fuse.
Replace the cover on the fuse compartment.
Plug in the DC adaptor plug to the electronic device and connect the other end to a power outlet.
Do not replace fuses that are rated lower or higher than the posted fuse type on the DC adaptor. Installing a different fuse can damage or ruin electronic equipment as well as cause overheating and risk of fire.