01真水无香 发表于 2011-4-11 14:33

紧急求助

工昨天胆机焊好了，不接功率管开机试，发现整流管、前放管灯丝不亮，仔细查电路，原来是整流桥中有一相接在接地线柱子上，重改好后灯亮了，但电源变压器一引出线有闪火，随即灯灭，剥开线看没问题，试着开机灯亮，但变压器线包发热严重，一开始没注意这点，不知是闪火后发热还是闪火前就发热。再查，又发现滤波电容负极没接地，焊上地后再试，整流管、前放管灯丝亮，正想关机插功率管，发现变压器还是巨热，用万用表测，线包原副边电阻均正常，对灯丝、对地都正常，没接了地。另外，变压器浸漆良好，没交流声，刚才发现发热严重后凑到变压器上闻了闻，剌鼻的气味呛得头晕，但不是焦味。以我贫乏的知识解决不了问题了，请各位朋友帮着分析一下，变压器如此热度是怎么回事？该如何解决？具体步骤如何？
    先谢谢了。`````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````

a006 发表于 2011-4-11 14:38

断开连线，测个绕组有否短路了

01真水无香 发表于 2011-4-11 16:09

经查，原边、副边没有对地，原边电压234伏，副边260伏。灯丝一组6.5伏，一组6.89伏。断开整流桥变压器空载铁芯不发热。

a006 发表于 2011-4-11 16:17

那。。。整流桥是否挂了:lol

markts 发表于 2011-4-11 17:07

桥挂了。另楼主太搞笑了，，，上电前一定要仔细检查，最好在初级串个灯泡。

01真水无香 发表于 2011-4-11 21:41

唉，上机前我都拿台灯试了的。电压如前所示正常。但上机时闪火了。想来是缠牛时乱绕线包大了，我拿卡子卡住线包硬装进去的，可能这中间伤了线闪火了......老老实实重绕吧:funk::'(

saving 发表于 2011-4-11 22:13

应该是线路有严重短路

woaizhongzhong 发表于 2011-4-11 22:16

是不是质量不过关

7mu 发表于 2011-4-12 06:21

经查，原边、副边没有对地，原边电压234伏，副边260伏。灯丝一组6.5伏，一组6.89伏。断开整流桥变压器空载铁 ...
01真水无香 发表于 2011-4-11 16:09 http://bbs.hifidiy.net/images/common/back.gif


    这样说变压器可能还没事，检查线路和零件吧。

火星计划2009 发表于 2011-4-12 06:33

检查整流器，滤波电容是否有短路或是漏电的现象:handshake

lzn 发表于 2011-4-15 19:59

高压部分线圈击穿了？

syc 发表于 2011-4-16 15:30

唉，上机前我都拿台灯试了的。电压如前所示正常。但上机时闪火了。想来是缠牛时乱绕线包大了，我拿卡子卡住 ...
01真水无香 发表于 2011-4-11 21:41 http://bbs.hifidiy.net/images/common/back.gif

后生可畏，你糊弄它，它就糊弄你。电源部分是重中之重，决不能对付。
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