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Repairing A/B amp? Martin Logan plate amp.
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Author:  dannieboiz [ 04 Nov 2016, 16:59 ]
Post subject:  Repairing A/B amp? Martin Logan plate amp.

I have a Martin Logan Dynamo 700 that's has no output.

Fuse is checked and it looks good. The amp has a wifi module and that light does come on. Is there a way I can determine what failed? I have a digital multimeter and soldering equipment.

Subwoofer is checked with another amp and it's ok as well.

Author:  gofar99 [ 06 Nov 2016, 12:41 ]
Post subject:  Re: Repairing A/B amp? Martin Logan plate amp.

Hi, Are you sure it is the amp or possibly the source that might not be giving it signal? If it is the amp then I would seach for a schematic for the amp. One is likely to be out on the web. Try diyaudio.com there are a number of ML users there. The 700 is not all that popular so if you fail finding a schematic you might call ML for one. Sometimes they are helpful. I personally use their electrostatics in my main system and have a pair of the 300s on a HT set up.

Good listening
Bruce

Author:  dannieboiz [ 06 Nov 2016, 13:05 ]
Post subject:  Re: Repairing A/B amp? Martin Logan plate amp.

Yes for sure the source isn't the issue because the first thing I did was pulled the sub and test it using a difference source and also tested the source to make sure it had output.

Thanks for the pointer, I'll try searching on the other site for the schematic.

Author:  Geek [ 06 Nov 2016, 15:11 ]
Post subject:  Re: Repairing A/B amp? Martin Logan plate amp.

Check for bad solder joints... have yet to see a sub whether ML, B&W, Infinity or department-store-brand that didn't have bad ones.

Good luck with it, because more than half the time IME, it's one of two things:
- Some stupid proprietary driver chip.
- Shorted MOSFETS (from bad heatsinking) that are so unique, they can't be subbed without a re-engineer.

Cheers!

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