故障现象（1）第5道笔打定标摆幅很大，而且移位幅度也很大；（2）第3道笔偏向一边，调节面板上零位，又猛然偏向另一边，无法使其回到标准零位。故障分析与检修第5道、第3道笔皆属记录脑电放大支路，由现象来看，因为除此两道而外其余各道现象均正常，说明故障不出在公共的定 Symptoms (1) The 5th stroke pen setting is very large, and the shift range is also large; (2) The third pen is biased to one side, adjusting the panel zero, and suddenly biased to the other side, can not make it Return to standard zero position. Fault analysis and maintenance The 5th and 3rd pens are all records of the brain power amplification branch. From the phenomenon point of view, because all but two of these phenomena are normal, it means that the failure is not determined in the public.