Microwave interior light does not turn on, but heating and other functions work normally.

Safety first: Unplug the microwave before any lamp-related work.

Steps to address no interior light:

• 1. Confirm symptom: Check that the light does not come on when the door is opened or during cooking.
• 2. Consult manual: Some Toshiba models allow user replacement of the lamp via an access panel; others require cabinet removal.
• 3. If user-replaceable: Remove the access cover, replace the lamp with the specified Toshiba-compatible bulb, and reassemble.

If no access panel or if unsure: Have a technician replace the lamp and check the lamp circuit on the control PCB.