Quote:
Originally Posted by
jetplane666666
Quote:
Originally Posted by
rids
Quote:
Originally Posted by
barryfell
The hum on the NL4 and A1 is a mystery. Some people get it, some people don't. Maybe something to do with the frequency of the local power? 60hz rather than 50hz?
I'm in the UK so 50hz and no issue, as is Norway where they are made.
The more I read about the more I find that people from all over seems to have this issue. So it doesn't seem to be country dependent.
I fixed the hum issue in my Nord Lead 4. Clavia install a metal rf (radio frequency) shield over the internal switching power supply. This shield is very thin, and the magnetic field from the transformer induces it to resonate at 60 (or 50) Hz. I removed the shield in my NL4 with no negative consequences. Alternatively you can affix some weights to the shield to dampen it.
Don't do this yourself if you don't know what you are doing. I don't advise that anyone modify their Nord Lead 4, but this mod fixed my NL4, and makes it an absolute pleasure to play. Make the Nord Lead 4 great again!
After getting an A1, and puzzling over the awkward humming sound coming out of it for days... getting no help from Nord about it because it's "normal" apparently, I saw this post. I was planning to return the A1 because of the humming but really didn't want to. It's a solid, nice sounding synth.
So, I popped it open, took out the RF cage, and... it's DEAD SILENT now. Ah... I can't thank you enough.
I've had it plugged in an turned on for 2 days now just to make sure there is no change in function or heat generated and it's entirely fine. The RF cage is resonating with the power supply humming, and amplified by the insides of an all metal chassis, there is your humming sound. Take out the cage, and the problem totally resolves.
For reference, at least on my A1, it was a matter of 17 total Torx screws (size
#25 I believe, I can check if anyone needs) and 4 more of the same size Torx screws to remove the cage. It's incredibly simple to open and remove. The power supply itself is a shielded black brick on a PCB, surrounded by large capacitors. Removing the cage doesn't require you to deal with any of the power supply components, it's just a perforated metal box on top of the power supply PCB.
Anyway... eternal thanks to the original poster. I'm back to blissful silence.