Microwave is very noisy during operation with rattling, scraping, or grinding sounds from the cavity area.

Safety first: Unplug the microwave before handling internal parts.

Step-by-step checks:

• 1. Remove and inspect tray: Take out the glass tray and roller ring. Check for chips, cracks, or warping.
• 2. Clean cavity floor: Wipe away any debris or hardened food that may cause scraping.
• 3. Inspect roller ring: Ensure the wheels roll smoothly and are not flattened or broken. Replace if worn.
• 4. Check coupler: Inspect the plastic coupler for cracks or deformation. Replace if loose on the motor shaft.
• 5. Test motor: Run the microwave briefly without the tray to see if noise persists. If the noise comes from below, the motor bearings may be worn and the motor should be replaced.