You don't as they are not designed to be fixed.
Just buy a new replacement. They can be found for under $15 online.
If the charger itself is broken, it's probably best to just replace it; "universal" power supplies compatible with Acer laptops are available for $20-25 or so.
Usually, if the charger is damaged, there is no way to fix it. You will have to get a new one.
use an extender charger
There is no fuse in the unit itself. The fuse in the charger in in the plug.
There's no real fix to the Nexus 7 charger, but you can use a standard micro USB charger, or a wireless charger (Qi standard) to recharge the device.
The laptop charger may be broken and unable to power your laptop.
how to fix a 3ds charger port.
by a new one there only 10-15 pounds a charger.
There are various ways to fix a Dell laptop charger but this will depend with the type of fault. If you are not sure where the fault is, you should take it to a technician.
put water on it
Screw fix
If they are the same wattage and voltage, and have the same connector, yes.