故障现象负压报警。分析与检修根据故障现象判断 ,为负压泵压力不足所致。一般是压力跟随器、电磁阀及各通路阻塞或漏气所致。首先检查负压泵的真空情况 ,取下负压泵吸气管 ,接一负压表观察 ,负压正常 ,调节负压跟随器不起作用 ,此时听到有微弱的漏气声 ,检查各通路无漏气现象 Negative pressure alarm phenomenon. Analysis and Maintenance According to the phenomenon of failure to judge, as the negative pressure pump caused by insufficient pressure. General pressure follower, solenoid valve and the passage of obstruction or leakage caused. First check the negative pressure pump vacuum situation, remove the negative pressure pump suction pipe, then a negative pressure gauge observation, negative pressure is normal, adjust the negative pressure follower does not work, this time to hear a weak leak sound, check No leakage of the path of the phenomenon