1, power supply problems: CT machine needs a stable power supply, if the power supply is unstable or the power cord is aging, it may lead to power on the bulb next to the lamp is always on.
2, electronic component failure: CT machine electronic components, such as transformers, switching power supplies, rectifiers, etc., if there is a malfunction, it may lead to the light is always on.
3, sensor failure: CT machine internal sensors for detecting the position and angle of the bulb tube, if these sensors fail, it may lead to the light is always on.