| 本文笔者收到同行送来的故障机壹台格兰仕WD800B微型微波烘烤炉，故障表现为烘烤正常，微波失效。找下MT磁控管灯丝两极上的插头，测量灯丝两极电阻值为无穷大，已开路损坏(正常值应为数十毫欧姆)。用一良品800WMT管更换后，微波加热恢复。注：原MT管型号为2M226-519A。 |
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