Schematic diagram for Mordaunt-Short MS309-W - Page 2 - diyAudio
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Old 30th August 2012, 10:17 AM   #11
OXAUDIO is offline OXAUDIO  United Kingdom
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Join Date: Sep 2006
Thanks for the parts info, Sonic. Some time ago I replaced the bipolar caps. with a couple I had to hand. The two 4700uf checked OK before the 1.6AT Fuse blew, but I might replace them anyway. I have a couple of 12000uf caps which I got from Mouser a while ago. Don't remember the make or working voltage, but,if they are suitable and will physically fit, I may use them. As far as I know, there shouldn't be any problem caused by using higher capacity smoothers. The FETs I can get from Cricklewood Electronics CCTV and Electronic Componentsor one of the other UK based firms. As to the relay, I hadn't thought about checking/replacing it, but may have to. Araldite or similar may be the way to go when re-sealing components, so getting the 309W working again may be a real possibility.
Thanks again to everyone for their helpful suggestions.
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Old 7th September 2012, 10:00 AM   #12
OXAUDIO is offline OXAUDIO  United Kingdom
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Further to the above, the 12000uf Capacitors are (only)rated at 63v., so may not be adequate for the Mordaunt Short with its 60v DC rails. Pity!
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Old 23rd January 2013, 08:42 PM   #13
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Did you manage to fix it in the end?

I've got an MS309w that's cutting out randomly. If I can fix it by replacing a couple of cheap components then I might keep it for a while, otherwise I'm ready to throw it out and buy something new.
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Old 22nd December 2016, 12:58 PM   #14
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Just wanted to say thanks Sonic for the parts list. I found a nice repair guide on A&J audio but when I quoted irf640 to the guys in RS components they told me they need more info. I shall be attempting to repair my 309W over the festive period. Looks like the 10uf caps have gone but from reading that appears to then take out the 2 fets.
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