故障现象：各项功能全无输出。分析检修：首先检查电刀头、刀头连线。插头以及地到铝板的连线。然后检查高压供电电路保险丝F；已烧毁，且整个管壳烧黑，说明有大电流通过。通过简单的外部检查后打开机箱，检查功率输出电路，发现两个大功率场效应管烧穿。从市场上购两只同型号 Symptom: All functions have no output. Analysis and maintenance: First check the electric knife head, knife head connection. Plug and ground connection to aluminum. Then check the high-voltage power supply circuit fuse F; has been burned, and the entire tube burns black, indicating a large current through. After opening the case through a simple external inspection, the power output circuit was examined and two high-power FETs burned through. Buy two identical models from the market