Mccormack dna-1 protection problem


Hi
I have a Maccomack dna-1 with no upgades. 
Very often when i play music it goes in protection mode and the red light comes on.
Sometimes it works great for a day or two and somtimes it i hopeless. 
All cables and connectors are ok. I am sure the amplifier is faulty.

Is there sombody with an idea what the problem could be.

evilhifi

Showing 3 responses by evilhifi

Hi and thanks.
I did email Stewe and got a death sentence on the board. It will cost 900$ For a replacement main board. It is the through-hole plating that is the problem with my board. But I will try to re-solder it and put a copper wire through the holes. 

As it is now, when i press on the board a little bit it will go in to protection mode.


Heureka! I think i have fixed it(knock on wood).I have re-solder the whole board. On quite many of the solder joints the solder hade not gone through the board at all. I’m pretty sure the problem was the through-hole plating. That is why the board was so sensitive for pressing down on it

Now i have played on it for a few hours. I have pressed down on the board quite hard and taping on it. Much harder and more than before.This treatment would definitely triggered the protection before i re-soldered it.

One mishap in the repair. When i started up the amp the right channel did not play. It turned out to be a capacitor that hade shorted out. It took me about an hour to find the little one.

I will post an update in a week or two.
Ok.
It is time for an update. I Writing this because this part is often missing in threads like this.

It has now been 3 weeks since i did the re-soldering of the board. And guess what...
It still works:-) 

I am very pleased with my Mccormack and i feel like i don’t need any upgrades. I did recap it yesterday just to keep it alive a little bit longer.