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akai mfc42 noisy (HELP!)
Old 30th March 2012
  #1
Here for the gear
 
🎧 5 years
akai mfc42 noisy (HELP!)

no matter what cables i use, no matter what inputs im goin in or what out put im using theres a noisy hum in my mfc42... makes it pretty much unusable unless i eq it out with something else, but still after all that y even use it ..... any suggestions on how to make this thing quite

i kno its not a ground issue (externally) , its definitely not a cable / power issue so im pretty sure it has to be something internally.... im not afraid to open it up and operate i just need some suggestions what to look for / replace b4 i do

i would absolutely hate to just have this thing collect dust any help is much appreciated!

thanx!

~1~
Old 1st April 2012
  #2
Lives for gear
 
LeeYoo's Avatar
 
🎧 10 years
Soundclip
Pictures of the supply.
Old 2nd April 2012
  #3
Lives for gear
 
2N1305's Avatar
 
🎧 10 years
uhh, is the rear slide switch in "phono" mode?

that would definitely make noise if you're not using a turntable. (I don't see why someone would want to do that anyway)

cheers
Old 10th April 2012
  #4
Lives for gear
 
🎧 10 years
could be a few things,

PSU check the caps for bulgding, leaking/leaked fluid around the caps (don't confuse it for glue)

i had something similar in a S900 turned out to be a ceramic cap that was going from the PCB with the audio input on it to the case and the cap was either bugger or the solder joint was bad,
Old 11th August 2014
  #5
Gear Maniac
 
🎧 5 years
I'm afraid it's a design fault. Mine is useless for recording. I think there's some interference from de digital control cirquit to the audio path. I can hear stepping when i turn the knobs. The hum is at it's worst when i turn down (close) the low pass filter. It's such a cool device, but useless due to this issue.
Old 12th August 2014 | Show parent
  #6
Lives for gear
 
LeeYoo's Avatar
 
🎧 10 years
Quote:
Originally Posted by ralph ➡️
I'm afraid it's a design fault.
Could be maintenance too.
Capacitors do need to be replaced after a number of years, especially in the power supply.
Leo..
Old 12th February 2018
  #7
Gear Head
 
Old thread, but still looking for a simple mod to minimize the noise and ground buzz coming from my MFC42.
Old 9th June 2018
  #8
Gear Maniac
 
🎧 5 years
I did manage to minimise the noise somewhat by rerouting the internal (multicables)cables. There seems to be noise induced by an internal circuit (pilter circuit?)
But i would like to have a more solid solution as wel. I have a feeling some improvement of the internal grounding could be made, but it's just a gut feeling and my level of electronics doesn't go beyond building and debugging from an existing design.
Old 3 weeks ago | Show parent
  #9
Here for the gear
 
Quote:
Originally Posted by ralph ➡️
I did manage to minimise the noise somewhat by rerouting the internal (multicables)cables. There seems to be noise induced by an internal circuit (pilter circuit?)
But i would like to have a more solid solution as wel. I have a feeling some improvement of the internal grounding could be made, but it's just a gut feeling and my level of electronics doesn't go beyond building and debugging from an existing design.
Hi I know this was sometime ago but was wondering if you ever solved this once and for all? I have a hum in mine but it's only noticeable at higher volumes. Also, sounds like the transformer is bleeding through. I've recapped the unit but that wasn't it at all.
Old 3 weeks ago | Show parent
  #10
Gear Head
 
Quote:
Originally Posted by Graphik1200 ➡️
Hi I know this was sometime ago but was wondering if you ever solved this once and for all? I have a hum in mine but it's only noticeable at higher volumes. Also, sounds like the transformer is bleeding through. I've recapped the unit but that wasn't it at all.
Hey guys,

I've sent my MFC to a service center in germany, apparently they know the machine quiet well. He said he will try something. I will let you know soon, I should have news in the week or next one.

I already gave it to a tech a year ago but he was not specialised in audio pro, I believe he changed the power capacitors too but without success...
Old 3 weeks ago | Show parent
  #11
Here for the gear
 
Quote:
Originally Posted by kicks91 ➡️
Hey guys,

I've sent my MFC to a service center in germany, apparently they know the machine quiet well. He said he will try something. I will let you know soon, I should have news in the week or next one.

I already gave it to a tech a year ago but he was not specialised in audio pro, I believe he changed the power capacitors too but without success...
Thanks kicks91 appreciate you letting us know when you hear back.

Like your first tech, I too changed out the main capacitors to no avail. That said I'll be replacing the 6 main Opamps in mine early next week, since I've heard this can be an issue for the unit as well.

Planning on reporting back once I've tried that as well..
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