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故障现象调面板上基线调节电位器(W_4),表笔能移动,但不能移动到下底部,出现上、下不对称的现象。检查与分析首先用起子调节两只调零电位器W_3和W_(11),发现无论怎样调,表笔都不能移动到下底部(调W_3时表笔只能向上移动),这样初步可确定故障大致发生在功率放大部分或位置反馈部分。接着焊下R_(98)电阻,再调基线调节电位器(W_4),发现
Fault phenomenon The adjustment potentiometer (W_4) on the adjustment panel allows the meter to move, but it cannot move to the bottom, resulting in asymmetry between the top and bottom. Inspection and analysis First adjust the two zero adjustment potentiometers W_3 and W_(11) with a screwdriver, and find that no matter how the adjustment is made, the test leads cannot move to the bottom (when adjusting W_3, the test leads can only move upwards). This can be used to determine that the fault has occurred roughly. In the power amplification section or position feedback section. Then weld the R_(98) resistance and adjust the baseline adjustment potentiometer (W_4).