The d22 lamp of Mitsubishi elevator car roof maintenance box is easily broken when the elevator car is opened.

What you want to ask is why the d22 lamp of Mitsubishi elevator car roof maintenance box is easy to break when the elevator car roof is opened. It's because the bulb is aging and the lamp holder is in poor contact.

1, bulb aging: the bulb is used for a long time, and the filament may break due to aging, making it unable to emit light normally.

2. Poor contact of the lamp holder: Poor contact between the lamp holder and the bulb may also cause the bulb to not emit light normally, so it is necessary to check whether the lamp holder is loose or in poor contact.