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This study analyzes the maintenance and common faults of GE MINItrace Qilin medical cyclotron, and studies three kinds of the machine's faults.This paper introduces a fast repair methods of Versa HD volume-modulated accelerator's high voltage circuit faultthe key points test method. To identify five key points①Enter maintenance mode to check for AFC deviation; ② The magnetron waveform MI and PFN waveform PFN V are detected on the maintenance terminal board; ③ Detect thyratron waveform; ④ Check the supply voltage of thyratron; ⑤ HT PSU 60