美的电磁炉就报警,不加热,怎样维修?

2025-01-24 08:19:25
推荐回答(4个)
回答1:

美的新型电磁炉不报警不加热故障与维修 美的新型电磁炉不报警不加热故障与维修
故障现象
一台美的售后送修MC-EH213电磁炉,上电开机后出现“不报警、不加热”。
故障分析
美的新型电磁炉MC-IH-M02-B3主电路板,是选用05年标准通用板。也是售后维修常见故障之一,该故障潜在范围有;控制显示板、主电路板脱焊、高压供电电路、同步电压振荡电路、高压检测电路、浪涌保护电路、驱动放大电路、LC振荡电路、及使能开关电路等原因,均会导致电磁炉上电开机后出现“不报警、不加热”故障。维修时,将取下原机控制显示板。先更新换上新的控制显示板,若故障存在、应对主电路板进行逐点补焊,若故障存在、再按以下方法进行维修。
故障维修
一、整机高低压供电电路的维修:
将电磁炉上电待机时,用500型三用表直流电压500V、50V、10V档,测整机高压供电电路C4(5μF/275V)对地+305V电压,正常。若该电压偏低或0电压时,会出现:1)将电磁炉上电开机检锅时,数秒钟内“爆烧IGBT管”。2)将电磁炉上电开机加热时,出现“报警不加热”故障。3)将电磁炉上电开机加热时,出现“不报警不加热”故障。一般常见损坏元件是;C4(5μF/275V)失常、或L1电感开路、脱焊。测整机低压供电电路C92(104)对地+18V电压,正常。若该电压偏低或0电压时,在整机高压供电+305V、+5V正常时,上电开机会出现“爆烧IGBT管”。一般常见损坏元件是;D93(BYV26C)、D94(1N4148)、ZD1(18V/0.5W)、EC94(100μF/16V)。测整机低压供电电路C91(104)对地+5V电压,正常。若该电压偏低或0电压时,将电磁炉上电开机会出现“开不了机”故障。一般常见损坏元件是;D92(UF4007)、U90(7805)、D94(1N4148)、ZD1(18V/0.5W)、EC94(100μF/16V)。
二、同步电压振荡电路的维修:
将电磁炉上电待机时,用500型三用表直流电压10V档, 1)测同步电压比较电路取样电压,比较器U2C第7脚V+同相输入端对地+4V电压,正常。若该电压偏低或0电压时,将电磁炉上电开机加热时,会出现“不报警不加热”故障。一般常见损坏元件是;U2C第7脚V+同相电压取样电阻R13(820KΩ/1W)变值、开路或电容器C8(51)漏电、或击穿、及U2C(LM339)损坏。 2)测同步电压比较电路取样电压,比较器U2C第6脚V-反相输入端对地+3.8V电压,正常。若该电压偏低或0电压时,将电磁炉上电开机加热时,会出现“不报警不加热”或“报警不加热”故障。一般常见损坏元件是;同步电压取样电阻R11(820KΩ/1W)变值、开路或电容器C7(221)漏电、或击穿、及U2C(LM339)损坏。 3)测振荡电路,比较器U2C第1脚输出端对地+5V电压,正常。若该电压偏低或0电压时,将电磁炉上电开机加热时,会出现“不报警不加热”故障。一般常见损坏元件是;贴片电阻R27(330Ω)变值、开路或U2C损坏。
三、高压检测电路的维修:
将电磁炉上电待机时,用500型三用表直流电压10V档,测高压检测电路,比较器U2C第8脚反相输入端对地+0.9V电压,正常。若该电压上升时,将电磁炉上电开机加热时,会出现“不报警不加热”故障。一般常见损坏元件是;1)贴片电阻R19(3.3KΩ)变值、开路。2)贴片电容器C10(101)漏电、击穿。3)U2C(LM339)损坏。
四、浪涌保护电路的维修:
将电磁炉上电待机时,用500型三用表直流电压10V档,测浪涌保护电路取样电压,比较器U2A第5脚同相输入端对地+3.2V电压,正常。若该电压上升时,将电磁炉上电开机加热时,会出现“不报警不加热”故障。一般常见损坏元件是; 1)浪涌保护电路取样电压交流耦合电容器C15(102/500V)漏电、击穿。 2)取样电压对地贴片分压电阻R42(12KΩ)断裂、开路。3)贴片电容器C13(101)、二极管D20(1N4148)漏电、击穿。4)比较器U2A(LM339)损坏。
五、驱动放大电路的维修:
将电磁炉上电待机时,用500型三用表直流电压50V、10V档,测驱动放大电路,贴片三极管Q3(8050)集电极对地+18V电压,正常。基极、发射极对地0电压,是正常。测贴片三极管Q4(8550)基极、发射极、集电极对地0电压,是正常。将电磁炉上电开机加热时,会出现“不报警不加热”故障。一般常见损坏元件是;1)贴片三极管Q4(8550)发射极与集电极击穿。2)贴片电容器C12(221)漏电、击穿。
六、LC振荡电路的维修:
将电磁炉上电待机时,用500型三用表直流电压500V档,测LC振荡电路,共振电容器C5(0.3μF/1200V)对地+305V电压,正常。若该电压偏低时,将电磁炉上电开机加热时,会出现“不报警不加热”故障。一般常见损坏元件是;1)共振电容器C5(0.3μF/1200V)失常。2)若该电压正常,是限幅稳压二极管Z1(18V/0.5W)漏电、击穿。3)IGBT管控制极与发射极漏电、击穿。
七、使能开关电路的维修:
将电磁炉上电待机时,用500型三用表直流电压10V档,如图:测使能开关电路,贴片三极管Q5(8050)集电极对地+6.2V电压,正常、基极、发射极对地0电压,是正常。测贴片三极管Q6(8050)基极对地+0.7V电压,正常、集电极、发射极对地0电压,是正常。将贴片三极管Q6焊下,用三用表电阻10KΩ档,测试Q6发现集电极与发射极之间反向漏电。将贴片三极管Q6更新后,整机恢复正常。 八、维修提示:
在维修美的新型电磁炉MC-IH-M02-B3主电路板,电开机后出现“不报警、不加热”故障时。用500型三用表直流电压测试法,其维修方法如下;
1、将受损电磁炉上电待机,测整机高低压供电电路,分别对地+305V、+18V、+5V正常。
2、测同步电压比较电路,比较器U2C第7脚V+同相输入端对地+4V电压,正常。第6脚V-反相输入端对地+3.8V电压,正常。第1脚输出端对地+5V电压,正常。
3、测高压检测电路,比较器U2C第8脚反相输入端对地+0.9V电压,正常。第14脚输出端对地+2.2V电压,正常。
4、测浪涌保护电路,比较器U2A第5脚同相输入端对地+3.2V电压,正常。第2脚输出端对地+0.2V电压,正常。
5、测驱动放大电路,贴片三极管Q3(8050)集电极对地+18V电压,正常。基极、发射极对地0电压,正常。测贴片三极管Q4(8550)基极、发射极、集电极对地0电压,正常。
6、测LC振荡电路,IGBT管集电极对地+305V电压,正常。
7、测使能开关电路,贴片三极管Q5(8050)集电极对地+6.2V电压,正常、基极、发射极对地0电压,正常。测贴片三极管Q6(8050)基极对地+0.7V电压,正常、集电极、发射极对地0电压,正常。
8、若测以上对地电压均正常,但故障存在时。1)先将使能开关电路贴片三极管Q6取下,将受损电磁炉上电试机,若正常。常见为三极管Q6损坏。2)若故障存在,将三极管Q6重新焊入。常见为三极管Q4、贴片电容器C12、限幅稳压二极管Z1、滤波电容器C4、共振电容器C5、IGBT管控制极与发射极漏电损坏。将受损元器件更新后,整机恢复正常。
希望能解决您的问题。

回答2:

我的经验是输出电容坏了。

回答3:

送维修点检修

回答4:

没相当水平的修不了

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