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Subject: Re: [korgpolyex] Re: Frozen Poly 800

From: Michael Hawkins <korgpolyex800@...>
Date: 2013-01-24

Have you opened up the Poly and had a look to see if there is any sign of brown sludge that might have come from old batteries in the battery compartment? Let's exclude that first.

Then, do you have a multimeter and soldering iron etc?

Mike



From: cc0919ship <cc0919@...>
To: korgpolyex@yahoogroups.com
Sent: Thursday, January 24, 2013 9:14 AM
Subject: [korgpolyex] Re: Frozen Poly 800

 

Hm...Don, no matter what switches are enabled or disabled, and no matter what buttons on the front panel are pressed (or how many times) the display stays at 1.8 50 01 (unless I use the MIDI keyboard.) I'll try again with the Tape switch, but I'm almost positive that any change in switches doesn't yield any sort of result. I've definitely never seen it say 11 .P, no matter what I did (although I think that once I hit keys on the MIDI keyboard enough, it did change to 1.8 .P once.

--- In korgpolyex@yahoogroups.com, "backshall1" wrote:
>
> When you first turn the Poly-800 on, with sequencer disabled, the display
> should say 11 .P (only two sets of digits). The only time you should see
> three sets of digits which increment when you press a key is if the
> sequencer is enabled AND the Start button has been pressed. Do you see any
> change in the display if you press the Prog/Para button a couple of times?
> Do you see any change in the display if you move the Tape switch between
> Disable/Enable? It should say 7APE when it is enabled.
>
> Don B.
>
> _____
>
> From: korgpolyex@yahoogroups.com [mailto:korgpolyex@yahoogroups.com] On
> Behalf Of cc0919ship
> Sent: Wednesday, January 23, 2013 11:20 PM
> To: korgpolyex@yahoogroups.com
> Subject: [korgpolyex] Re: Frozen Poly 800
>
>
>
>
>
>
> Hey Michael,
>
> Thanks so much for the response! I plugged in my 88 key MIDI controller, and
> every key (including accidentals) incremented the value by 1.
>
> --- In korgpolyex@yahoogroups.com ,
> Michael Hawkins wrote:
> >
> > Since the switch checked out OK, you would have to look further into the
> electronics that runs the scanning of the switches.
> >
> > What you should do is start from the bottom note on the keyboard and work
> your way up through all of the keys, normals and accidentals. Take note of
> which keys do NOT cause the display to count up (the right hand displays
> should increment by 1 each time to play a note).
> >
> > If some of the notes on the keyboard do NOT cause the display to increment
> then we can check the schematic and see if we can work out which chips or
> DTC's or diodes or other things might be broken.
> >
> > Mike
> >
> >
> >
> >
> > ________________________________
> > From: cc0919ship
> > To: korgpolyex@yahoogroups.com
> > Sent: Wednesday, January 23, 2013 8:36 PM
> > Subject: [korgpolyex] Re: Frozen Poly 800
> >
> >
> > Â
> > Anyone else have any ideas? I really don't want to trash this synth if it
> is something simple, was really looking forward to using it :(
> >
> > --- In korgpolyex@yahoogroups.com ,
> "cc0919ship" wrote:
> > >
> > > Hello all,
> > >
> > > I'm wondering if you can help me out. I recently acquired a broken Poly
> 800 (original, not MKII.) It powers up, but immediately after powering up,
> the screen reads "1.8 50 01." Buttons on the front panel do nothing, and
> keys do not make noise. If I turn up the volume the whole way, I can hear
> the filter sweeping up and down. Here's where it gets interesting - I
> plugged in a MIDI keyboard, and when I play notes with the MIDI keyboard,
> the 800 makes static noises, and the last value on the screen increments by
> one.
> > >
> > > I opened it up, checked the tactile switches (all seem fine.) I also
> replaced the internal CMOS battery. I was under the impression that MKI 800s
> didn't have this, so the main board may have been replaced by someone along
> the line.
> > >
> > > Anyway, has anyone had a problem like this and could help me out? It is
> potentially one of the ICs, but I have no idea how to test them.
> > >
> > > Thanks,
> > >
> > > Christian
> > >
> >
>