故障一:故障现象:开机后,调节基线移位电位器W_4,记录笔无偏移。故障检修:先考虑是否由于基线移位电位器 W_4损坏,或记录笔松动等方面的原因造成记录笔无移位,经检查电位器 W_4及记录笔与其记录器的连动情况,未见异常。记录笔移位不正常,说明阻容耦合以后的电路不正常。重点检查后置电压放大器以及限幅和驱动功率放大器等电路。用万用表测量后级动算放大器 YS_2的 Fault 1: Symptom: After power on, adjust the baseline shift potentiometer W_4, pen no offset. Troubleshooting: First consider whether the baseline displacement Potentiometer W_4 damage, or pen loose and other reasons for the recording pen no shift, check the potentiometer W_4 and pen and its recorder with the linkage of the situation, no exception. Record pen shift is not normal, indicating that after the RC coupling circuit is not normal. Focus on checking post-voltage amplifiers and limiting and driving power amplifiers and other circuits. Use a multimeter to measure the post-stage operational amplifier YS_2