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故障 1 打开机器电源开关 ,机器自检正常 ,字符显示完全 ,但远近场无超声回声显示。故障分析与检修 从故障现象看 ,与此有关联的电路是(1)收发单元部分 ;(2 )驱动电路部分 ;(3)主放大器输出部分 ;(4 )ＤＳＣ单元中Ａ/Ｄ转换部分 ;(5)电源部分。由于无超声回声显示 ,且听不到
Fault 1 Turn on the machine’s power switch, the machine self-test is normal, the character display is complete, but there is no ultrasonic echo display in the near and far field. Fault Analysis and Maintenance From the perspective of fault phenomena, the circuits associated with this are: (1) Transceiver unit section; (2) Drive circuit section; (3) Main amplifier output section; (4) A/D conversion section in DSC unit; (5) Power supply section. Because there is no ultrasonic echo display, and no