Smeg A1-6 - Manual (Page 30)

Instructions for the user
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11. EXTRAORDINARY MAINTENANCE
The oven may require extraordinary maintenance or replacement of parts
subject to wear such as seals, bulbs, and so on. The following
instructions describe how to carry out these minor maintenance
operations.
Before any intervention, disconnect the power supply of the device.
11.1 Replacement of light bulb
Remove cover A by twisting anticlockwise, replace bulb B with another
similar bulb. Refit the cover A.
Only use oven bulbs (T 300°C).