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故障一：开机后出现Ｆ－２２故障代码，查维修手册可知故障在ＮＯ３３１ＭＣ板的振荡电路部分。检修：将ＮＯ３３１ＭＣ板拆下来，给该板独立接上＋５Ｖ工作电源，如图１所示，用示波器检测ＨＩＣ１的７、８脚是否有１．３ＭＨｚ～１．４ＭＨｚ的脉冲波形，如果有，则正常。结?
Fault 1: After the boot, there will be an F-22 fault code. Check the maintenance manual to find out the fault in the oscillation circuit of the NO331MC board. Maintenance: Remove the NO331MC board and connect the board to the +5V power supply. As shown in Figure 1, check whether the pulse waveforms of the 7th and 8th pins of the HIC1 have a pulse waveform of 1.3MHz to 1.4MHz. If so, then normal. Knot?