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Subject: Re: [korgpolyex] Re: a broken ex800

From: Michael Hawkins <korgpolyex800@...>
Date: 2010-01-22

It shouldn't do anything on power up but it should send a patch change when you change patches.

If your PC900 is dead then I think maybe some other chips in that area might be too. Do you know what the history of the EX is? Did someone go poking around in it? Does it appear to have been abused as a child? Is there any sign of water damage? Corrosion? In that area of the board?

Mike

From: ariebruus <ariebruus@...>
To: korgpolyex@yahoogroups.com
Sent: Fri, January 22, 2010 6:10:30 AM
Subject: [korgpolyex] Re: a broken ex800

 

the ex doesn't transmit any midi, only when turn off and on again (system reset). What should it say??

--- In korgpolyex@yahoogro ups.com, Michael Hawkins <korgpolyex800@ ...> wrote:
>
> But does your EX-800 transmit MIDI? It would seem incredibly weird to me if the PC900 replaced would have changed the transmit side.
>
>
>
>
> ____________ _________ _________ __
> From: ariebruus <ariebruus@. ..>
> To: korgpolyex@yahoogro ups.com
> Sent: Thu, January 21, 2010 2:06:29 PM
> Subject: [korgpolyex] Re: a broken ex800
>
>
>
>
> --- In korgpolyex@yahoogro ups.com, Michael Hawkins <korgpolyex800@ ...> wrote:
> >
> > If your are not seeing any MIDI messages coming out of the EX then I doubt it is the PC900.
> >
> > I would suggest start checking voltages and waveforms (with a scope) around:
> >
> > IC26, DTA1, IC27, DTC1, IC28. See the schematic.
> >
> > Mike
> >
> >
> >
> >
> > ____________ _________ _________ __
> > From: ariebruus <ariebruus@ ..>
> > To: korgpolyex@yahoogro ups.com
> > Sent: Thu, January 21, 2010 4:54:38 AM
> > Subject: [korgpolyex] Re: a broken ex800
> >
> >
> >
> >
> > --- In korgpolyex@yahoogro ups.com, Michael Hawkins <korgpolyex800@ ...> wrote:
> > >
> > > Also, change programs and see if the EX-800 is sending MIDI out program change messages. Then check the channel of those messages.
> > >
> > > Mike.
> > >
> > >
> > >
> > >
> > > ____________ _________ _________ __
> > > From: Electrohead <electrohead2000@ ...>
> > > To: "korgpolyex@ yahoogro ups.com" <korgpolyex@ yahoogro ups.com>
> > > Sent: Wed, January 20, 2010 9:55:47 AM
> > > Subject: Re: [korgpolyex] Re: a broken ex800
> > >
> > >
> > > I agree. Check ur channel settings. Try using a midi monitor program like midi-ox to make sure there isn't a problem with the computer you are using. Also try using a different cable.
> > > After that, then I'd start checking for a loose connection inside. Particularly if you've had it apart.
> > > Good luck!
> > >
> >
> > Thanx, i'm sure i've got the right midi channel (midi-ox is sending on all channels). I've checked every possible way to make sure it isn't a cable or parameter. I've also checked with another midi device an that works fine. I use midi-ox to monitor the midi messages. The only time the ex sends out a message is when i turn it off and on again. Then midi-ox gives the message: device reseting. It doesn't send out a message when i change program or press start/stop (i guess it normally does send a message??). I did not check if there's a loose wire inside, will do that asap. I'll also try to replace pc900, but first fool around some more without using a soldering iron.
> >
>
> I'm happy, because the ex is on again!! It was indeed the pc900. I swopped it for a new one and it worked right away! Thank you all again for saving another korg with all this info.
>