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Hi mike,
That was one of the first things i checked. Slightly worryingly just after i had installed the Hawk800 and finally got it to restart, the 5v rail seemed to be at about 5.8v but i've trimmed it back to 5v.
I think this is definately a grounding issue somewhere. If i replace the main board and tighten all the screws as much as i can, with all the ground leads and sheilding connections in place then it appears to work fine no matter how hard i poke the board, although i'm not really that keen on just relying on the fact that it works without actually knowing why. I guess i'll have to just put in the time and go component by component to track down the problem.
By the way, is there an issue with the Hawk800 firmware and the DCO modulation when you use the Joystick? If i push the joystick up and introduce DCO modulation, and then let the joystick go so it snaps back into place, then 80% of the time the modulation remains on the sound. If i move the joystick back to its resting position by hand the modulation is reduced and then disappears completely as normal. Its as if if you let it snap back there isn't enough data resolution to catch the settings in between maximum and zero, so when it moves that fast you're left with the maximum setting.
--- In korgpolyex@yahoogro ups.com, Michael Hawkins <korgpolyex800@ ...> wrote:
>
> Paul,
>
> I would start with a multimeter and measure the +5volt rail and carefully adjust it using VR1 near the power regulator (top left hand corner looking from the front of the main board).
>
> I've had two HAWK-800 customers with kits that placed just a little more load on the power supply to bring it under the required minimum (+4.75).
>
> You should adjust it to be as close to +5.0 volts as you can. CAUTION: Be careful not to send the power too far over 5 volts.
>
> Then go looking for your intermittent problem.
>
> Mike.
>
>