[维修案例] 定速柜机Eb故障维修案例

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一、机器型号:

KFR-72LW/DY-YA400(D3)

二、故障现象:

开机内机显示Eb,内、外机不工作

三、检修过程

  • 步骤1:根据美的通故障代码Eb提示为室内板与显示板通讯故障,检查主板与显示板的接头是否连接可靠,重新插接后故障依旧。
  • 步骤2:用万用表检测室内主板的12V与5V电压是否正常,发现12V没问题,但是测试5V只有4V左右,判断室内主板坏,申请新主板,更换后故障依旧。
  • 步骤3:能引起5V被拉低的,可能是弱电负载短路所致,将T1室温、T2室内管温、和T3室外管温逐一拔掉,测量其阻值,当测到T3管温时,发现其中一脚对地短路。检测室内主板到T3传感器整个连线,发现T3连接线在室外机侧被钣金压伤导致破皮,铜线与钣金接触短路。更换T3传感器后,主板5V恢复,故障排除。

四、故障原因分析

72定速冷暖柜机,室外机有一根T3室外管温传感器与室内板连接(制热化霜需检测T3管温),而温度传感器检测电路的供电电压是5V,如果传感器对地短路的话,主板5V将会被拉低,而5V拉低后,主板的主芯片因供电电压变低后不再工作了,所以主板与显示板就无法通信上了,而显示板用的是12V供电,12V没有拉低,所以显示板能正常显示,能正常报故障代码。

五、注意事项

当出现主板与显示通讯故障时,不要着急换板,要先用万用表测试电控板电压是否正常,正常再尝试换板处理。


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