mpc 60 sampling noise

Sorry if this has been covered a million times. There's a high pitched whine from my mpc 60mk2, which I understand is the display inverter? I read through a few threads and couldn't really find any easy solution so I figured I would just leave. It's not that noisy.

However, I realised today it actually spills into recordings. Setting the gain to high makes it ridiculously loud, and it's still there on low. Any tips for fixing this? Could it be a grounding issue? Or do I have to fix the inverter?

thanks

Yes it is most likely the inverter. Do you know how to open the mpc and spot the inverter? Obviously unplugged

Hi, a photo I already had:

It's the black cube and the small board right? I'll open it up again today. What should I be looking for? I also read somewhere that somebody with a similar issue grounded their cf reader to the case and it solved the problem. Can anyone comment on this? I guess I could just try and see.

It looks like the invertor has been covered in black tape in a previous attempt to silence the vibrations, it probably needs replacing with a compatible akai invertor or a replacement unit. The internal caps may have failed completely.

As a stopgap measure simply disconnect the invertors power line and relive the joys of silent operation, although you obviously sacrifice the backlight.

Plenty of threads on repairing/replacing an invertor with great input from Matt White. I have one of the 'USB invertors' and so far no problems to report.

Thanks for the info. I'll try disconnecting the power to the inverter just to make sure that's the issue.

Clint wrote:I have one of the 'USB invertors' and so far no problems to report.

I unplugged the inverter and it runs totally silent, including sampling. I've been through the threads and all links I found for replacement inverters were dead. You don't have a link for the one you use do you?

thanks

I think that there is a DIY procedure on here somewhere that shows how to open the inverter and stop it making physical noise.

One of the USB inverters might be the way to go.

Have you made sure that the cables to/from the inverter are routed within the MPC so that they do not go anywhere near the audio inputs and audio circuitry?

Ok, the rerouting the cable got rid of the whine, but I realised there is still noise - a sort of artifact hd/digital sort of noise. Its barely audible on low gain but if you on any other settings you can hear it. I'm listening via the headphone jack.

USB Invertor

Update:

micb wrote:The one which we actually should be using is this one
http://www.ebay.co.uk/itm/12V-DC-to-AC- ... 4d0a594a6d



This at 5v is alot closer to the original output voltage. This at 6v gives out 77v, which is alot lower than 240v. It is a little bit bigger, but is alot closer when compared to the original spec. Maybe clint could alter the link in the 60 bible with this inverter instead.

Matt's DIY repair

viewtopic.php?f=4&t=162816&start=75

Go through the whole thread for some expert opinions on invertor whine issues.

Cheers man.

I also did some rearranging of the other cables away from the inputs, and everything is silent now. Well, some regular noise floor if you crank everything to max.