{"id":44091,"date":"2022-04-27T23:20:11","date_gmt":"2022-04-28T06:20:11","guid":{"rendered":"http:\/\/k6hr.com\/?p=44091"},"modified":"2022-04-28T00:23:07","modified_gmt":"2022-04-28T07:23:07","slug":"sm10-power-supply-board-swap","status":"publish","type":"post","link":"http:\/\/k6hr.com\/index.php\/2022\/04\/27\/sm10-power-supply-board-swap\/","title":{"rendered":"SM10 Power Supply Board Swap"},"content":{"rendered":"\n

The line mixer<\/a> I use in the shack to combine audio from the PC and the transceivers, has developed a nasty 60 cycle hum. It’s time for an SM10 Power Supply Board Swap.<\/p>\n\n\n\n

\"SM10
SM10 POWER BOARD<\/figcaption><\/figure>\n\n\n\n

This is the suspect board. Can you see the problem already?<\/p>\n\n\n\n

\"SM10
SM10 POWER BOARD<\/figcaption><\/figure>\n\n\n\n

The problem is a bit easier to see from this angle. Do you see it yet?<\/p>\n\n\n\n

\"SM10
SM10 POWER BOARD<\/figcaption><\/figure>\n\n\n\n

There you have it. Those filter caps are bulging big time! These failed capacitors are the reason we have developed the annoying hum.<\/p>\n\n\n\n

\"SM10
SM10 POWER BOARD<\/figcaption><\/figure>\n\n\n\n

Here are the same two caps on the replacement board. Notice how the tops are nice and flat! The vents are not open or stressed.<\/p>\n\n\n\n

\"SM10
SM10 POWER BOARD<\/figcaption><\/figure>\n\n\n\n

Side by side comparison.<\/p>\n\n\n\n

An easy fix! I’m now HUM-FREE<\/h2>\n\n\n\n

The SM10 power supply board swap did the trick!<\/p>\n\n\n\n

I will order (2) 1000uf 35v and (2) 220uf 25v replacement caps, and partially recap the original board for use later on when the replacement fails!<\/p>\n\n\n\n

From the manufacturer:<\/h2>\n\n\n\n

The SM10 features ten channels with 1\/4″ stereo line inputs and a balance control for each channel. Two channels include XLR mic inputs. This allows you to blend the relative levels of stereo inputs to your liking. In addition, each channel includes a switch for +4 dBu or -10 dBV line level input.<\/p>\n\n\n\n

For output, the SM10 provides electronically balanced main stereo XLR and 1\/4″ line outputs. The SM10 provides versatile signal routing via Main Mix, Mix B, Monitor and EFX bus outputs, as well as low noise and discrete microphone pre-amplifiers with 48-volt phantom power.<\/p>\n\n\n\n

Two auxiliary sends can also be used to route signals to external effects, or create a separate mix for on-stage monitors. The SM10 features front panel headphone and monitor outputs with dedicated level controls. The mix may be audited with the SM10’s 6-segment LED meter and a flexible meter\/headphone source control.<\/p>\n\n\n\n

Back To The Front<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

The line mixer I use in the shack to combine audio from the PC and the transceivers, has developed a nasty 60 cycle hum. It’s time for an SM10 Power Supply Board Swap. This is the suspect board. Can you see the problem already? The problem is a bit easier to see from this angle. … Continue reading “SM10 Power Supply Board Swap”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","footnotes":""},"categories":[12],"tags":[],"class_list":["post-44091","post","type-post","status-publish","format-standard","hentry","category-whats-new"],"yoast_head":"\nSM10 Power Supply Board Swap - K6HR SDR Server 2026<\/title>\n<meta name=\"description\" content=\"This Samson SM-10 Line Mixer had developed a loud 60 cycle hum. A quick board swap solved the problem. 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