[变频空调维修]-第3章-不接收遥控信号故障-第3节-遥控器损坏,不发射信号

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空调培训资料缩略图

第3节 遥控器损坏,不发射信号

故障说明

美的KFR-26GW/BPY挂式交流变频空调器上电后导风板自动关闭,使用遥控器开机,室内机没有反应。按压“应急开关”按键,蜂鸣器响一声后,空调器开始运行,制冷正常,判断故障在遥控器或接收器电路。图3-14所示为发射二极管驱动电路原理图。

图3-14 美的KFR-26GW/BPY遥控器发射二极管驱动电路原理图

图3-14 美的KFR-26GW/BPY遥控器发射二极管驱动电路原理图

1.检查遥控器

如图3-15所示,查看遥控器显示屏显示字符正常,按压“开/关”按键,屏幕出现开机的图标,同样发射信号标志闪动一下,说明遥控器CPU已处理按键信息,并控制电路发出信号。

图3-15 遥控器显示正常和按压“开/关”按键

图3-15 遥控器显示正常和按压“开/关”按键

2.检查遥控器是否发射信号

如图3-16左图所示,开启手机的摄像功能,将遥控器发射头对准手机的摄像头,同时按压遥控器“开/关”按键,发射标志同样闪动一下,但在手机屏幕上观察遥控器的发射头一直未有亮光发出,判断遥控器出现故障。

遥控器电池电压低也会出现类似故障,如图3-16右图所示,使用万用表直流电压挡,测量电池电压,实测2节电池电压均为直流1.6V,说明电池正常。

图3-16 手机检测遥控器和测量电池电压

图3-16 手机检测遥控器和测量电池电压

3.测量发射二极管引脚电压

由于按压遥控器按键时屏幕上的发射标志闪动一下,说明CPU已处理按键信号,并输出信号驱动发射二极管,判断控制电路正常,故障在驱动电路或发射二极管。

如图3-17所示,使用万用表二极管挡,测量发射二极管引脚电压,红表笔接正极,黑表笔接负极,以判断驱动电路是否将电压放大并送至发射二极管。由于驱动信号只是瞬间发出,变化很快,使用数字万用表很难判断电压是否变化,但可使用“最大值测量功能”,即按下万用表的“MAX”键,此时万用表进入“最大值测量”功能,显示屏显示数值时只显示最大值,在未按压遥控器按键时,显示数值为直流0V,多次按压“开/关”按键,遥控器发射信号,电压逐渐上升,至约直流2V时不再变化,因此判断驱动电路正常,遥控器CPU发出的信号经驱动电路放大后已送至发射二极管,应测量发射二极管是否正常。

图3-17 测量发射二极管两端电压

图3-17 测量发射二极管两端电压

4.在路测量发射二极管

取下遥控器电池,如图3-18所示,使用万用表二极管挡在路测量发射二极管。红表笔接正极、黑表笔接负极为正向测量,测量时应导通;红表笔接负极、黑表笔接正极为反向测量,测量时应截止。但实测正向和反向均为无穷大,初步判断发射二极管开路损坏。

图3-18 在路测量发射二极管

图3-18 在路测量发射二极管

5.单独测量发射二极管

将发射二极管从电路板上取下,如图3-19所示,使用万用表二极管挡单独测量,实测正向和反向均为无穷大,从而确定发射二极管损坏。

图3-19 单独测量发射二极管

图3-19 单独测量发射二极管

维修措施

更换发射二极管,如图3-20所示。发射二极管共有2个引脚,分别为正极和负极,内部体积小的引脚为正极。更换后按压遥控器“开/关”按键,室内机主板蜂鸣器响一声后,导风板打开,室内风机运行,室内机主板向室外机供电后,室外风机和压缩机运行,制冷恢复正常,故障排除。

总结

发射二极管损坏在实际维修中占到一定比例,其中空调器和彩色电视机的遥控器发射二极管通用,维修时可以互换。

图3-20 更换发射二极管

图3-20 更换发射二极管

经验

遥控器检查方法

如图3-21所示,开启手机摄像功能,将遥控器发射二极管对准手机摄像头,按压按键的同时观察手机屏幕,如果发射二极管发出白光,说明遥控器正常;如一直无白光发出,则可判定遥控器有故障。

图3-21 使用手机检测遥控器方法

图3-21 使用手机检测遥控器方法


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