What skills should I have to be qualified for these jobs? please note that I studied up through University?

A problem solving mindset. You start identifying key components and work towards solving the issue and preventing its recurrence. The biomedical engineering degree provides the background for the problem solving process.

Regarding skills you should have a good communication skills added to medical equip. background   

When you maintain an electronic device, you have to put the possibility of the existing failure, and then start the maintenance of the device from the most likely to the smallest