408UL仪器LMP板电源故障的排除与探讨

Troubleshooting for power failure of LMP boardin 408UL instrument

408UL仪器LMP板发生故障会造成主机控制箱体与PRM工作站无法正常联机,使408UL仪器系统无法正常运行。通过LMP板的状态指示灯、LMP板自检过程显示的代码信息,可判断LMP板故障与否。经分析、判断LMP板故障现象和自检运行状态,可逐步排查5V电源供给电路、微处理器的时钟电路、复位时序电路、3.3V稳压电路等是否正常。本文还就如何排除因反馈电阻R116阻值变大而造成的LMP板故障进行了介绍。

The failure of 408UL LMP board will cause the host losing control with PRM workstation, so that the 408UL instrument system can＇t run normally. Through the LMP board＇s status indicator and code information showed in the LMP board self-test process, we can determine whether the LMP board fault or not, then can gradually cheek the 5V power supply cireuit, the mieroprocessor clock circuit, reset circuit, 3.3V circuit and so on. This paper also in- troduces how to solve LMP fault caused by the grown largerRl16feedback resistance.