Diagnosis
This is often caused by the protective shipping film on the light bulb not being removed. The heat from the bulb melts the film.
How to Fix It
Turn off power at the circuit breaker. Remove the light bulb cover. Remove the halogen bulb (part 6323ER1003A). Peel off any clear plastic film remaining on the glass bulb. Reinstall bulb and cover.
If That Didn't Work
Inspect the cavity for melted plastic utensils or food packaging. Check the waveguide cover for food spatter. Arcing from food debris can cause a burning smell.
Heads Up
Always use the specified 50W halogen bulb. Higher wattage bulbs can overheat the socket and wiring.