@mike_in_md OP said he already checked the fuses.
Need recommendation for repair service in CA bay area - McCormack DNA-1
My DNA-1 powers up but the protection circuit won't turn off so the amp never outputs audio. It has a red led (protection) and a green one (power on). When you power on, they both come on and the red one should go off after 15 seconds or so when the amp is ready to work. The light stays on.
I unplugged input cables and output speaker wires. Same problem. I plugged into a different outlet / circuit. Same problem. I removed the over and didn't see anything obviously burned or loose. Checked all 5 fuses - all good.
So time for repair.
Please let me know of a recommendation in the California SF bay area ideally.
This may be a very simple fix. I have the same amp. Take off the screws on the top of the amp. Inside are 4 rail fuses 2 on each side. If any of those fuses are blown the red light will not go out. Check or replace those fuses and you will be back in business. Shouldn't take more than 30 minutes ad it may save you some aggravation. I was back in business for $6.00 |
+1 @ozzy62 ----- I followed along with a few folks who checked into this with Pat/Steve, and we concluded sending it in and having the nice rebuild sure makes for a nice alternative while it lasts. And, you can end up with a really nice amp for the $, compared to buying and all-new amp, if you are open to it. I just did something similar with one of my own other brand SS amps. It sure sounds nice, totally worth it, fwiw. Maybe worth a few phone calls to gain confidence going this route. |
@newbee is correct. No brainer give SMcAudio a call — they designed/built your amp and will be by far your best resource, and lucky you at least they’re in California (I had to ship them my amp from NJ 😖). The input board on my DNA 0.5 RevA failed, which makes the amp not repairable so I decided to send it to them to do their full upgrade mods, which basically makes it a new amp with all their latest/best parts and thinking. The only parts they kept from my amp was the case and the transformer only because it was already upgraded in the previous RevA mod otherwise that would’ve gone too. Hope this helps, and best of luck. |
FWIW, I've been investigating the McCormack lines looking for an amp for another system. I suggest you do some research as well. There have been considerable conversations about failures of an input board in the DNA .05 and DNA 1 model amps. I don't know if this could be your problem but if it is you may not want to pursue repairs. One of the posts in a thread is from McCormack describing the problem and why it is in their opinion not 'repairable', at least why they will no longer do so anyway. Good luck............ |