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PostPosted: 04 Nov 2016, 16:59 
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Joined: 04 Nov 2016, 16:49
Posts: 2
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.


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PostPosted: 06 Nov 2016, 12:41 
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Joined: 04 Jun 2008, 20:59
Posts: 3646
Location: Arizona, USA
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

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PostPosted: 06 Nov 2016, 13:05 
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Joined: 04 Nov 2016, 16:49
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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.


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PostPosted: 06 Nov 2016, 15:11 
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Joined: 08 Aug 2009, 03:11
Posts: 2208
Location: Chilliwack, BC
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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* Ratings are for transistors - tubes have guidelines*
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