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Stern Opto Board


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If that is the same one for the swinging bell on acdc, quite often the small 3 legged transistor goes. Its a bit fiddly to replace but you can buy the part for about 50c rather than buy a whole board

 

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Yep, i have replaced 3 or 4 of the Q1 on these. its a BSS123 Mosfet... i was lying, they are 25c each!!

 

http://au.rs-online.com/web/p/mosfet-transistors/6710321/?searchTerm=6710321&relevancy-data=636F3D3126696E3D4931384E525353746F636B4E756D6265724D504E266C753D656E266D6D3D6D61746368616C6C26706D3D5E5C647B367D247C5E5C647B377D247C5E5C647B31307D2426706F3D313426736E3D592673743D52535F53544F434B5F4E554D4245522677633D4E4F4E45267573743D3637313033323126

 

Just remove the old one, and you may need a pair of tweezers and fine soldering tip to put the new one in. It could be the opto itself, but in my experience Q1 seems more likely

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