{"id":1817,"date":"2012-04-15T15:08:35","date_gmt":"2012-04-15T13:08:35","guid":{"rendered":"http:\/\/www.retro.co.za\/blog\/?p=1817"},"modified":"2012-04-15T15:10:53","modified_gmt":"2012-04-15T13:10:53","slug":"repairs","status":"publish","type":"post","link":"http:\/\/www.retro.co.za\/blog\/?p=1817","title":{"rendered":"Repairs"},"content":{"rendered":"

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This is the 6871W1S113E control board from our LG MG-604W microwave. The transformer primary went open circuit when the supply hit 300V or thereabouts. I know that these things often incorporate some kind of protection circuitry, so I desoldered the transformer.<\/p>\n

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Sure enough, it’s a 1A 130C fuse.<\/p>\n

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Fixed (yea, this solution doesn’t have thermal protection. I can live with it).<\/p>\n

Of course, now that I know the layout I know that one can add a fuse or a jumper to the PCB without having to desolder the transformer. Again, you’ll lose thermal protection.<\/p>\n

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The transformer primary is between the left and middle pins, and the fuse runs from the righthand pin to the lefthand pin.<\/p>\n

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I was not so lucky with the Sakyno SK-1000 clock radio. In this case the transformer primary was the protection device, and the magic smoke leaked out.<\/p>\n

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The Philips AJ3121 clock radio transformer has a fuse as well, the wire leading down on the right hand side goes over to the other side, where there’s a square\u00a0 125C thermal fuse wrapped up against the winding.<\/p>\n

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It’s at the left hand side under the red tape under the plastic.<\/p>\n

Unfortunately I stuffed it up, I jiggled the wire too much and the primary winding, which is cat-hair-thin, broke off from the fuse lead. I tried resoldering it but it’s just too finicky.<\/p>\n

So we bought two new clock radios. But at least the microwave works.<\/p>\n","protected":false},"excerpt":{"rendered":"

This is the 6871W1S113E control board from our LG MG-604W microwave. The transformer primary went open circuit when the supply hit 300V or thereabouts. I know that these things often incorporate some kind of protection circuitry, so I desoldered the transformer. Sure enough, it’s a 1A 130C fuse. Fixed (yea, this solution doesn’t have thermal protection. I can live with it). Of course, now that I know the layout I know that one can add a fuse or a jumper to the PCB without having to desolder the transformer. Again, you’ll lose thermal protection. The transformer primary is between the...<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[75,31,4],"tags":[],"class_list":["post-1817","post","type-post","status-publish","format-standard","hentry","category-electronics","category-geek","category-house"],"_links":{"self":[{"href":"http:\/\/www.retro.co.za\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1817","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.retro.co.za\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.retro.co.za\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.retro.co.za\/blog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.retro.co.za\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1817"}],"version-history":[{"count":4,"href":"http:\/\/www.retro.co.za\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1817\/revisions"}],"predecessor-version":[{"id":1832,"href":"http:\/\/www.retro.co.za\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1817\/revisions\/1832"}],"wp:attachment":[{"href":"http:\/\/www.retro.co.za\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1817"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.retro.co.za\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1817"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.retro.co.za\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1817"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}