A speed oven combines microwave and convection heating in one unit with a more complex control board than a standalone microwave, which means it has an additional set of parts that can fail — the convection heating element and fan, on top of the magnetron and control electronics a standard microwave also has. A drawer microwave, by contrast, trades that complexity for a motorized drawer mechanism and its own position sensors.
Knowing which type you have — speed oven, drawer microwave, or standard built-in — helps narrow down what’s likely wrong before a technician even arrives, since the three platforms don’t share the same common failure points.