Microwave makes loud grinding or scraping noises when the turntable rotates.

Safety first: Unplug the microwave before cleaning under the tray.

• Clean components: Remove the glass tray and roller ring. Wash them with warm soapy water, rinse, and dry. Wipe the cavity floor to remove crumbs or hardened spills.
• Inspect roller ring: Check for flat spots, broken wheels, or warping. Replace the roller ring if damaged.
• Check coupler: Inspect the plastic coupler for cracks or deformation. Replace if worn.
• Reassemble and test: Reinstall the roller ring and tray, ensuring they are seated correctly. Run the microwave with a cup of water and listen for improvement.
• Next step: If grinding persists, the turntable motor or support may be damaged and require replacement.