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故障 1:FC - 6 2 0FT腔压板螺钉松造成频率偏移。故障现象 :输出功率有时下降到 4 0 0~ 6 0 0W ,有时能自动恢复 ,没有规律。分析与检修 :出现功率下降时观察各级电子管和激励器仪表指示均正常。用扫频仪看前后级的频响曲线 ,发现是FC - 6 2 0FT腔的工作频率偏低 3M
Fault 1: FC - 6 2 0FT cavity plate screws loosen into frequency offset. Symptom: Output power sometimes dropped to 400 ~ 600W, sometimes automatically restored, there is no law. Analysis and Overhaul: In the event of power drop, observe all levels of tube and actuator instrumentation are normal. Using the scanner to see the front and rear class frequency response curve, found to be FC - 6 2 0FT cavity operating frequency is low 3M