Microwave produces excessive vibration or rattling noises from the cabinet during operation.

Safety first: Unplug the microwave before tightening screws or opening the cabinet.

Step-by-step checks:

• 1. Level the unit: Ensure the microwave sits flat on a stable surface. Adjust feet if present.
• 2. Tighten exterior screws: Check and tighten screws on the outer cabinet and rear panel.
• 3. Internal inspection: Remove the cabinet and verify that the transformer, fan, and other large components are securely mounted.

After tightening, test again. If vibration persists, a failing motor or transformer may be the source and should be evaluated by a technician.