{"id":979,"date":"2013-04-30T22:59:26","date_gmt":"2013-05-01T06:59:26","guid":{"rendered":"http:\/\/www.modd3d.com\/articles\/?p=979"},"modified":"2013-04-30T23:00:33","modified_gmt":"2013-05-01T07:00:33","slug":"waldorf-microwave-xtk-no-power-fix","status":"publish","type":"post","link":"http:\/\/www.modd3d.com\/articles\/item\/waldorf-microwave-xtk-no-power-fix","title":{"rendered":"Waldorf Microwave XTk No Power Fix"},"content":{"rendered":"

\"Waldorf<\/a><\/p>\n

The Waldorf Microwave XTk is the keyboard version of the Waldorf Microwave XT.\u00a0 It uses the same line-lump power supply, only it’s hidden inside the unit.\u00a0 The coaxial power connector normally used on the XT is covered up, and the power supply wires are soldered directly to the board.<\/p>\n

\"Waldorf<\/a><\/p>\n

There are many things that can make these synths not power up, but one common culprit is the transient voltage suppressor diode that is connected across the power input.\u00a0 This can fail to a short, causing it to appear that the power supply has died.<\/p>\n

\"Waldorf<\/a><\/p>\n

\"Waldorf<\/a><\/p>\n

To troubleshoot, take the unit apart and disconnect at least one side of the power supply.\u00a0 Plug the power supply in.\u00a0 Does the light come on now?\u00a0 Do you measure ~12VDC at the output?\u00a0 If not, then the problem is probably a bad power supply after all.\u00a0 If so, then the problem is somewhere else in the synth.<\/p>\n

Next, lift one leg of the transient voltage suppressor diode and use a meter to take an ohms reading across it.\u00a0 It should either appear open or have a very high resistance.\u00a0 If the resistance is low (like less than 1 ohm), then the part is bad.\u00a0 This very low resistance shorts out the power supply and makes it shut down.<\/p>\n

Obtaining and replacing the diode is fairly easy and inexpensive.\u00a0 The part number is BZW04-15B and Mouser stocks them<\/a>.\u00a0 Don’t worry about installing it the wrong way; it’s bidirectional.<\/p>\n","protected":false},"excerpt":{"rendered":"

The Waldorf Microwave XTk is the keyboard version of the Waldorf Microwave XT.\u00a0 It uses the same line-lump power supply, only it’s hidden inside the unit.\u00a0 The coaxial power connector normally used on the XT is covered up, and the power supply wires are soldered directly to the board. There are many things that can […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-979","post","type-post","status-publish","format-standard","hentry","category-synthesizers"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t