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故障现象:开机瞬间有消磁电流冲击声,显像管上有瞬间高压产生,随后“待机”指示灯亮或待机状态,过1分钟后,按“待机键”重复上述现象,同时侍机指示灯闪烁4～5次后,常亮,呈“三无”。分析与检修:K29MF1机有三种保护:(1)B+过压、过流保护;(2)场保护;(3)高压X射线保护。首先确认是何种保护状态:(1)开机检测D609负极,B+(135 V)
Symptom: There is an instant impact of degaussing current during start-up. There is an instantaneous high voltage on the picture tube. After that, the “Standby” indicator is on or standby. After 1 minute, press “Standby button” to repeat the above phenomenon, After 5 times, always bright, was “three no.” Analysis and overhaul: K29MF1 machine has three kinds of protection: (1) B + over-voltage, over-current protection; (2) field protection; (3) high-pressure X-ray protection. First confirm what kind of protection status: (1) boot detection D609 negative, B + (135 V)