Alpha Juno intermittent noise [ SOLVED ]

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Pro5
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Gear: Prophet 10 Rev 4 | Prologue 16 | JD-800
Location: U.K

Re: Alpha Juno intermittent noise

Post by Pro5 » Mon Apr 22, 2013 2:20 pm

UPDATE:

Swapping that IC didn't fix it.

And there is a huge noise floor in general on the left channel (constant) that you can't normally hear from the usual outputs (after the volume board) but by tapping into the vol board connector.

Noticed when I freeze sprayed the M2541l VCA chip the overall noise floor reduced, so I guess that's my next suspect.Now to find a source for those!

I found one in the UK but £8 + vat sounds a bit steep vs what I saw in the US!
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Pro5
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Posts: 1004
Joined: Tue Oct 07, 2008 9:30 pm
Gear: Prophet 10 Rev 4 | Prologue 16 | JD-800
Location: U.K

Re: Alpha Juno intermittent noise

Post by Pro5 » Mon May 20, 2013 12:51 pm

Ok, didn't want to leave the thread hanging and info may be useful for someone in future.

I did buy a new M5241l chip (from a UK supplier) cost around £10 delivered. Soldered it in and it's fixed the problem! Both channels are now quiet and no more random noises :)

So with hindsight, I can now say the freeze spray did tip me off that it was that due to it ever so slightly lowering the overall noise floor when sprayed, have learned from that diagnosis so will know what to look for in the future.

Anyway, it's fixed now and the audio probe and freeze spray combo narrowed it down to the VCA chip, bingo! 8-)

Thanks for the help.
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