{"id":11985,"date":"2023-06-20T12:01:52","date_gmt":"2023-06-20T16:01:52","guid":{"rendered":"https:\/\/www.engineeringradio.us\/blog\/?p=11985"},"modified":"2023-07-04T07:47:09","modified_gmt":"2023-07-04T11:47:09","slug":"fixing-the-switching-power-supply","status":"publish","type":"post","link":"https:\/\/www.engineeringradio.us\/blog\/2023\/06\/fixing-the-switching-power-supply\/","title":{"rendered":"Fixing the switching power supply"},"content":{"rendered":"\n

This particular power supply is used in Broadcast Electronics AM1A, AM2.5E, AM5E, AM6A, AM10A, FM1C, FM10T, FM20T, FM30T and FM35T transmitters. It is a Computer Products NFN 40-7610, 40 Watt, +5 VDC, +\/- 15 VDC BE part number 540-0006.<\/p>\n\n\n\n

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BE AM1A ECU power supply, C-15 marked with pen for replacement<\/figcaption><\/figure>\n\n\n\n

Generally, one component fails over time on this unit, C-15 which is a 680 uF 35 V electrolytic capacitor. When that capacitor dries out, the power supply will fail to start, do odd things like start and fail after a second or two, or cycle on and off. This will happen after the transmitter has been off for a few minutes. Replacing C-15 with a 1000 uF 50 V capacitor will fix the problem. There is enough room for the larger capacitor if the leads are left a little bit long.<\/p>\n\n\n\n

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BE AM1A repaired ECU power supply re-installed<\/figcaption><\/figure>\n\n\n\n

We have several of these repaired units on various shelves at various transmitter sites.<\/p>\n\n\n\n

As always, when replacing electrolytic capacitors, pay attention to the polarity otherwise this will happen:<\/p>\n\n\n\n

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Blown Electrolytic Capacitor installed backward <\/figcaption><\/figure>\n\n\n\n

I suppose somebody was in a hurry to get home that day. After I installed this repaired unit, it ran for about 15 seconds and then there was a pop. I opened the door on the ECU and white smoke was wafting out from under the power supply cover. Since the Pope is still The Pope, I knew it was the electrolytic capacitor. <\/p>\n\n\n\n

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Back in business<\/figcaption><\/figure>\n\n\n\n

Our beloved BE AM1A is back in service. This transmitter is 22 years old and we can keep it going for as long as parts are available.<\/p>\n","protected":false},"excerpt":{"rendered":"

This particular power supply is used in Broadcast Electronics AM1A, AM2.5E, AM5E, AM6A, AM10A, FM1C, FM10T, FM20T, FM30T and FM35T transmitters. It is a Computer Products NFN 40-7610, 40 Watt, +5 VDC, +\/- 15 VDC BE part number 540-0006. Generally, one component fails over time on this unit, C-15 which is a 680 uF 35 … Continue reading Fixing the switching power supply<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":12003,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[32,15],"class_list":["post-11985","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tech-stuff","tag-am-transmitters","tag-fm-transmitters"],"_links":{"self":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/11985","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/comments?post=11985"}],"version-history":[{"count":8,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/11985\/revisions"}],"predecessor-version":[{"id":12051,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/posts\/11985\/revisions\/12051"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/media\/12003"}],"wp:attachment":[{"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/media?parent=11985"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/categories?post=11985"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.engineeringradio.us\/blog\/wp-json\/wp\/v2\/tags?post=11985"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}