朔里矿井下127伏煤电钻全部采用Zz8L-2.5型综合装置供电、控制和保护。该装置保护全、体积小、重量轻、结构简单、使用维护方便,深受现场的欢迎。但在二年多的使用过程中,印刷电路板曾多次发生烧损现象,有的烧焦甚至烧穿一个洞。烧损地点都在先导回路R_8电阻及D_8～D_(11)整流桥位置上。 ShuoLi mine 127 volt coal drill all use Zz8L-2.5-type integrated device power supply, control and protection. The device protection, small size, light weight, simple structure, easy to use and maintain, welcomed by the scene. However, in more than two years of use, the printed circuit board has repeatedly burned phenomenon, and some burnt even burn through a hole. Burning locations are pilot circuit R_8 resistance and D_8 ~ D_ (11) rectifier bridge position.