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Schematic diagram for Mordaunt-Short MS309-W
Schematic diagram for Mordaunt-Short MS309-W
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Old 30th August 2012, 09:17 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, 09:00 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, 07:42 PM   #13
ChrisW77 is offline ChrisW77
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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, 11:58 AM   #14
MrHippo is offline MrHippo
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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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Old 14th April 2017, 05:34 PM   #15
kipper1 is offline kipper1
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Thanks, i think that D502 on page 25 of the attached JBL service manual is our D152 on our MS519 (mordaunt short) subwoofer board. Do you agree? Its 1N5246B on the JBL document. This is a 16V zener. Do you think it is again a 16V zener on our MS519 board?
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Old 14th April 2017, 05:36 PM   #16
kipper1 is offline kipper1
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oops sorry , i forgot to post the manual here it is now..
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Old 7th May 2017, 09:47 AM   #17
kipper1 is offline kipper1
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Thanks to Sonic Assault, the JBL manual you kindly linked has helped us to fix our MS519 amplifier.
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