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MOTU 828 Mk ii buzzes like a bumble bee.

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MOTU 828 Mk ii buzzes like a bumble bee.

Postby Kolakube » Fri Nov 16, 2012 11:18 pm

Hi all,

Just got an 828 mk ii second hand of Ebay.

When plugged into the mains with no other connections (so not a ground loop or anything audio) it buzzes. Its about as loud as a blue bottle fly trying to get out of the window. So not defining but defiantly annoying considering no fans inside or working parts.

Is this normal? Anyone else got one they can check out?
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Re: MOTU 828 Mk ii buzzes like a bumble bee.

Postby 2M » Sat Nov 17, 2012 12:01 am

I got one, and it is absolutely dead silent. Perhaps the power supply is faulty?
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Re: MOTU 828 Mk ii buzzes like a bumble bee.

Postby Kolakube » Sat Nov 17, 2012 9:32 am

Hi, thanks mate.

Ill contact the seller and see whats what re a return. He seems a decent guy.

Hopefully he'll be just as decent at aftersales.
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Re: MOTU 828 Mk ii buzzes like a bumble bee.

Postby Hugh Robjohns » Sat Nov 17, 2012 11:05 am

If you're talking about an acoustic buzz, it's probably the mains transformer laminations rattling, which is anoyingly common.

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Re: MOTU 828 Mk ii buzzes like a bumble bee.

Postby Magic Matt » Sat Nov 17, 2012 11:30 am

My HiFi amp started doing that after I moved - I figured maybe it had been knocked or bumped and we'd just not been careful enough... it was like it for about 2 months and when I was eventually looking at replacing it, it just suddenly stopped buzzing and has never done it since.

Just saying it's possible it may have been fine before being posted and it's a result of something happening during transport/shipping...

Is it possible this kind of thing could be a loose screw or a dead easy fix?
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Re: MOTU 828 Mk ii buzzes like a bumble bee.

Postby Kolakube » Sat Nov 17, 2012 7:22 pm

Thanks guys, yes he's took the return so all good.
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Re: MOTU 828 Mk ii buzzes like a bumble bee.

Postby ef37a » Sat Nov 17, 2012 10:18 pm

You know I would have put money on MOTU using a SMPSU?

But no, a (very!) careful perusal of the manual shows they are supplied in 100-120 or 230V format indicating a 50/60Hz supply.

Rattly mains traffs really should not happen these days, especially in such low power, high'ish end gear. If the "re owner" is looking in I would task MOTU to repair the unit free of charge and then bounce the transformer back to their suppliers for a report.

There ARE some advantages to line lumps!

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