Microwave makes a grinding or scraping noise when the turntable rotates.

Steps:

• Remove the glass tray and roller ring. Wash both with warm soapy water, rinse, and dry.
• Wipe the oven floor to remove crumbs or hardened spills.
• Inspect the roller ring wheels for flat spots or cracks; replace if damaged.
• Check the plastic coupler on the floor for cracks or deformation.
• Reinstall the roller ring and tray, ensuring they sit flat and centered.

If grinding persists and appears to come from below the floor, the turntable motor or its mount may be worn and should be replaced.