Microwave produces sparks or arcing inside the cavity during cooking.

Safety: Stop the microwave immediately by opening the door or pressing STOP. Unplug the unit and allow it to cool.

Steps:

• 1. Remove metal: Ensure no metal utensils, twist ties, or foil are inside (unless specifically allowed by Sharp instructions).
• 2. Inspect waveguide cover: Locate the small mica or plastic cover on the side wall (waveguide cover). If it is burnt, cracked, or has holes, it must be replaced.
• 3. Clean cavity: Thoroughly clean any burnt food or grease from the walls and ceiling using mild detergent. Carbonized residue can cause arcing.

Repair: Replace a damaged waveguide cover with the correct Sharp part. If arcing persists or there is visible damage to the metal cavity or waveguide, have the unit inspected by a technician.