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现象：扫描时，曝光中断；重试还中断。分析与检查：用CTD诊断软件测试曝光也不能持续，错误码为2102：“X－raytubecurrentnotpresentafterfirmwarerequest”；即当固件发出请求检测球管电流时，末检测到管电流信号。究其原因有：（1）无管电流：如由于球管老化所致的灯丝开路
Symptoms: The exposure was interrupted during the scan; the retry was also interrupted. Analysis and inspection: The test exposure with CTD diagnostic software can not be continued, the error code is 2102: “X-ray tube current not present after firmware request”; that is, when the firmware sends a request to detect the tube current, the tube current signal is detected at the end. The reasons are: (1) No-pipe current: If the filament is open due to aging of the bulb