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

Safety warning: Disconnect power before removing internal parts.

Steps to try:

• 1. Remove tray and ring: Take out the glass tray and roller ring.
• 2. Clean surfaces: Wipe the cavity floor and the roller ring track to remove crumbs and hardened spills.
• 3. Inspect roller ring: Check for flat spots on wheels or cracks in the ring. Replace if damaged.
• 4. Check tray fit: Ensure the glass tray sits properly on the coupler and roller ring without rocking.
• 5. Test without load: Run the microwave briefly with only the coupler (no tray or ring). If grinding persists, the motor may be noisy and require replacement.

Continued use with a damaged support can stress the motor and should be avoided.