{"id":107,"date":"2018-05-23T04:43:07","date_gmt":"2018-05-23T04:43:07","guid":{"rendered":"http:\/\/ethan.757.org\/?p=107"},"modified":"2018-05-23T04:44:43","modified_gmt":"2018-05-23T04:44:43","slug":"digital-music-corp-mx-8-midi-patchbay-power-supply-repair","status":"publish","type":"post","link":"https:\/\/ethan.757.org\/index.php\/2018\/05\/23\/digital-music-corp-mx-8-midi-patchbay-power-supply-repair\/","title":{"rendered":"Digital Music Corp MX-8 MIDI Patchbay power supply repair"},"content":{"rendered":"<blockquote class=\"imgur-embed-pub\" lang=\"en\" data-id=\"a\/W7nERZa\"><p><a href=\"https:\/\/imgur.com\/a\/W7nERZa\">Digital Music Corp MX-8 repair<\/a><\/p><\/blockquote>\n<p><script async src=\"\/\/s.imgur.com\/min\/embed.js\" charset=\"utf-8\"><\/script><\/p>\n<p>Years ago I picked up a handy unit called the MX-8. I think I found it for $20 on craigslist. The unit has 8 or so inputs and 8 or so outputs. You can software connect any input to any output. It can do data inspection and changes and other stuff, but all I use it for is basically a multi thru box. <\/p>\n<p>I tend to leave my cheapest synthesizer on all the time, it&#8217;s a Roland JV-30. I bought that dead, swapped a diode on the power input and it was good to go. By leaving the keyboard, MX-8 and one MIDI module on all the time I am more tempted to stop and bang around on the keyboard a little.<\/p>\n<p>All this uptime on the little MX-8 eventually resulted in it dying. Hit keyboard key, nothing happened. Figured power loss wiped out the current settings but nope, no power.<\/p>\n<p>First I checked the fuse, but the fuse broke off in the fuse holder and wouldn&#8217;t come out. Fuses blow for a reason anyways.<\/p>\n<p>De-racked unit and popped lid off. Was always curious what was inside.<\/p>\n<p>CR-2032 (I think that is the size) lithium battery holds the memory. If your MX-8 forgets everything, this battery is easy to replace and this should fix your issue.<\/p>\n<p>The power issue was a standard ?7805? voltage regulator. It died from heat. The heat is from being left on 24&#215;7 for 10 years. When I replaced it, I re-spooged it with some fake artic silver heatsink compound. For sport, I added a 2nd heatsink behind the factory one so there is a bit more surface area ti dissipate heat.<\/p>\n<p>Unit looks well made inside.<\/p>\n<p>I think the hardest part of this entire ordeal was replacing the fuse holder I broke.<\/p>\n<p>I did consider moving to a switch mode power supply, like from a phone charger. I didn&#8217;t have anything handy so I just kept it on the original linear regulator. I could save some heat and power by converting it. Perhaps next time.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Years ago I picked up a handy unit called the MX-8. I think I found it for $20 on craigslist. The unit has 8 or so inputs and 8 or so outputs. You can software connect any input to any output. It can do data inspection and changes and other stuff, but all I use [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/ethan.757.org\/index.php\/wp-json\/wp\/v2\/posts\/107"}],"collection":[{"href":"https:\/\/ethan.757.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ethan.757.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ethan.757.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ethan.757.org\/index.php\/wp-json\/wp\/v2\/comments?post=107"}],"version-history":[{"count":4,"href":"https:\/\/ethan.757.org\/index.php\/wp-json\/wp\/v2\/posts\/107\/revisions"}],"predecessor-version":[{"id":111,"href":"https:\/\/ethan.757.org\/index.php\/wp-json\/wp\/v2\/posts\/107\/revisions\/111"}],"wp:attachment":[{"href":"https:\/\/ethan.757.org\/index.php\/wp-json\/wp\/v2\/media?parent=107"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ethan.757.org\/index.php\/wp-json\/wp\/v2\/categories?post=107"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ethan.757.org\/index.php\/wp-json\/wp\/v2\/tags?post=107"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}