第6节 室外环温传感器分压电阻开路,压缩机不运行
故障说明
海信KFR-50GW/09BP挂式交流变频空调器遥控开机后,室外风机运行但压缩机不运行,检查结果为模块损坏。申领一块新室外机主板更换后试机,室外机主板上电后听到继电器触点频繁的吸合与断开,室外风机时转时停,约15s后才开始以高风运行。图4-29所示为室外机传感器电路原理图。
图4-29 海信KFR-50GW/09BP室外机传感器电路原理图
1.测量室外环温传感器插座电压
如图4-30所示,室外机主板上指示灯以LED3和LED4亮、LED2灭报故障代码,查看含义为“室外环温传感器故障”。使用万用表直流电压挡测量室外环温传感器(GAIKI)黄色插座CN12,测量供电电压为直流5V,测量分压点电压也为直流5V,判断传感器电路出现故障。拔下室外环温传感器插头,使用万用表电阻挡测量阻值为4.7kΩ,说明传感器正常,应检查分压电阻阻值是否正常。
图4-30 室外机主板故障代码和测量环温传感器插座电压
2.测量分压电阻阻值
如图4-31所示,断开空调器供电,待室外机主板开关电源停止工作后,拔下管温传感器插头、压缩机排气温度传感器插头、压缩机顶部温度开关插头,使用万用表电阻挡测量分压电阻阻值。
实测室外环温传感器分压电阻R47阻值为无穷大,室外管温传感器分压电阻R45阻值为5.1kΩ,压缩机排气温度传感器分压电阻R39阻值为6.8kΩ,根据测量结果判断分压电阻R47开路损坏。
图4-31 测量室外机传感器电路分压电阻阻值
3.室外环温传感器分压电阻R47
如图4-32所示,R47为贴片电阻,表面数字5101,表示阻值为5.1kΩ。由于没有相同阻值的贴片电阻,选用阻值相同的四环普通电阻代换。
图4-32 5.1kΩ贴片电阻和四环普通电阻
维修措施
如图4-33所示,首先取下室外环温传感器插座,以免被烙铁烫坏,然后取下分压电阻R47,将代换电阻焊在原焊点位置,再安装插座。将室外机主板恢复引线试机,通上电源,遥控开机后压缩机和室外风机运行,制冷恢复正常,故障排除。
图4-33 更换室外机环温传感器分压电阻
总结
本例原本是室外风机运行,压缩机不运行,检查为模块击穿损坏,申领一块新主板更换后出现室外风机运行不正常,并报“室外环温传感器故障”的代码,检查结果为分压电阻开路损坏,这说明在维修过程中,有些新主板也存在故障,此种现象需要注意。
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