{"id":235,"date":"2012-02-05T16:05:14","date_gmt":"2012-02-05T21:05:14","guid":{"rendered":"http:\/\/www.rfdm.com\/blog\/?p=235"},"modified":"2012-03-02T20:54:42","modified_gmt":"2012-03-03T01:54:42","slug":"repairing-my-monster-hts-3500","status":"publish","type":"post","link":"https:\/\/www.rfdm.com\/blog\/?p=235","title":{"rendered":"Repairing my Monster HTS 3500"},"content":{"rendered":"

I have an older Monster HTS 3500 that died some time ago. In the interest of not putting it in the landfill, I took it apart today to see what’s wrong.<\/p>\n

One of the MOVs is toasted. It’s a Ceramate GNR20D201K. I can’t be sure, but I’m assuming a lightning strike or the like took it out. Don’t ask me why there isn’t a gas surge suppressor in here. Cheap construction would presumably be the answer, but I don’t have a schematic and don’t feel like digging too deep. I’ll replace the MOV and see what happens from there. I probably have some that I can scavenge, we’ll see.<\/p>\n

<\/p>\n

Feb 8, 2012<\/b>
\nI removed the burned MOV using my desoldering gun, and was about to replace it when I decided to check the thermal fuse that’s squeezed between the first two MOVs. It is open, so I need to replace it. It appears to be an SF139U, which as near as I can tell is no longer made. But it was 10A, 250V, 142 Celsius. I checked the other thermal fuses and they’re all good. I ordered new thermal fuses from Digi-Key, part number 317-1134-ND. I don’t have the same tape that Monster used to keep the MOVs near the thermal fuse. I’ll likely just use powdercoating tape since I know it’ll survive higher temperatures than the thermal fuse and I have some on-hand.<\/p>\n

To make sure this would fix things, I shorted across the leads of the open fuse. Sure enough, the HTS 3500 comes to life and shows no errors. Hooray for some inexpensive troubleshooting and parts saving me a couple hundred dollars.<\/p>\n

Feb 13, 2012<\/b>
\nI replaced two MOVs and the thermal fuse, and all is well. I put the case back on and it’s ready to go back in the family room.<\/p>\n","protected":false},"excerpt":{"rendered":"

I have an older Monster HTS 3500 that died some time ago. In the interest of not putting it in the landfill, I took it apart today to see what’s wrong. One of the MOVs is toasted. It’s a Ceramate GNR20D201K. I can’t be sure, but I’m assuming a lightning strike or the like took … <\/p>\n

Continue reading “Repairing my Monster HTS 3500”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[72],"tags":[],"class_list":["post-235","post","type-post","status-publish","format-standard","hentry","category-electronics"],"_links":{"self":[{"href":"https:\/\/www.rfdm.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/235","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.rfdm.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.rfdm.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.rfdm.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.rfdm.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=235"}],"version-history":[{"count":9,"href":"https:\/\/www.rfdm.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/235\/revisions"}],"predecessor-version":[{"id":293,"href":"https:\/\/www.rfdm.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/235\/revisions\/293"}],"wp:attachment":[{"href":"https:\/\/www.rfdm.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=235"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.rfdm.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=235"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.rfdm.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=235"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}