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

Safety first: Unplug before handling internal parts.

• Clean and inspect: Remove the tray and roller ring; clean the cavity floor thoroughly.
• Check roller ring: Replace if wheels are flat-spotted or missing.
• Inspect tray: Replace a cracked or chipped tray that may be rubbing.
• Check motor shaft: If the shaft is bent or noisy when turned, replace the turntable motor.