on a K7000 a blown fuse is usually due to a blown H.O.T. or a blown diode.
you need to install a new fly with the cap kit as well the old fly's fail shortly after a cap kit.
read the K7000 sticky at the top of this section and it will tell you where and what to look at.
if you have more questions we can help you.
i know nothing about that other chassis.
Peace
Buffett