While you wait for answers, we may have found some information which could help you.
Click here for Heating Grill Ovensharp convection microwave oven turns off after exactly 59 seconds. how to ?
is it safe to replace a magnatron in a sharp convection oven ??
fuse replacement?
sharp R259 800w?
How can I fix my Sharp Carousel Microwave Oven?
Microwave, Sharp R 957 not heating?