Hello!Thanks for the answers!
The problem is not on the power supply cause i am usings a pc psu for +/-5 and ground witch is way more accurate than the onboard..
It must be something else...
Does anyone knows what can be fried if you put +5 in position of -5 and -5 on position of +5?
I believe that the tl072c must be fried...
I dont know if the multiplexers can be fried too..
--- In korgpolyex@yahoogroups.com, Michael Hawkins <korgpolyex800@...> wrote:
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> -4.42 is too far out of spec. You will need to get that to -4.9 to -5.1.
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> ________________________________
> From: bruno lhuissier <bruno.lhuissier@...>
> To: korgpolyex@yahoogroups.com
> Sent: Saturday, August 13, 2011 12:48 PM
> Subject: Re: [korgpolyex] Problem with my poly800 reverse keys edition... :/
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>
> Â
> The low to high swooshing sound is the analog to digital sample and hold circuits discharging. Which indicates that the A2D multiplexing is not occurring.
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> So like I said, check the power rails first. Then let us know what you find.
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> I check the power rails:
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> The +5V is good (I recalibrate at +5V)
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> I ve got -4,42 V for the negative power
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