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

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

Step-by-step checks:

• 1. Remove tray and ring: Take out the glass tray and roller ring.
• 2. Clean surfaces: Wipe the cavity floor and roller ring track to remove crumbs, hardened food, or grease.
• 3. Inspect roller ring: Check for flat spots, broken wheels, or warping. Replace it if damaged.
• 4. Check tray: Inspect the glass tray for chips or warping that could cause uneven rotation.
• 5. Inspect coupler: Ensure the coupler is not cracked and sits flat. Replace it if worn.
• 6. Test: Reassemble and run with a cup of water to confirm the noise is gone.