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微波爐不加熱是什么原因

來源:鮮淘網(wǎng) 2020-06-30 01:42:29      鮮淘王子 手機版

　　微波爐不加熱先檢查供電是否正常，打開柜門后機是否亮燈。接下來尖茶保險絲是否燒斷，如果沒有曬段，則尖茶變壓器電路問題，緊接著尖茶高壓二極管、磁控管是否正常，最后檢測電容器。高壓電容器損壞，會出現(xiàn)短路情況，機燒壞保險絲。

　　微波爐不加熱是什么原因

微波爐不加熱是什么原因

　　1、高壓二極管

　　正常時，用萬用表Rx10k擋測量，正向導通(有一定電阻)，反向截止(電阻無窮大);用其他電阻擋測量正反向電阻均不通。高壓二極管損壞多為擊穿，即正反向都通。高壓二極管損壞引起的故障現(xiàn)象有：燒高壓保險，或微波爐運轉不加熱，微波運轉不加熱且噪音增大。

　　2、磁控管

　　正常時，測兩接線柱之間為零點幾歐姆，兩接線柱對外殼之間不通(阻值無窮大)。磁控管損壞，有的表現(xiàn)為燈絲兩接線柱之間開路，有的表現(xiàn)為兩接線柱對外殼導電形成通路，有的則無法直接測量出來。磁控管損壞引的現(xiàn)象有：微波爐運轉聲音小、不加熱，或燒電源保險、高壓保險、高壓二極管等。

　　3、高壓變壓器

　　正常時，測量兩輸入端之間電阻小于31，燈絲繞組阻值也很小近于OQ，高壓繞組阻值較大在9011—150f1。高壓變壓器損壞多以高壓繞組匝間短路居多。損壞后引起的現(xiàn)象有：運轉電流增大有異味，或運行不加熱、冒煙。

　　4、高壓電容

　　其容量在1卜F左右，內并聯(lián)有一只9MQ電阻。正常時，將指針萬用表置于Rx10k擋，兩表筆分別接高壓電容兩極，測量之初有一定阻值但不高，然后逐漸上升到9MQ左右;兩極片對外殼電阻應為無窮大。實際維修中高壓電容故障相對低，常見損壞形式是極片或絕緣木打火，個別為失效或擊穿。高壓電容損壞引起的現(xiàn)象有燒電源保險管或高壓保險管、微波爐能運轉但不加熱等。

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