Archive of the former Yahoo!Groups mailing list: Korg Poly800/EX800 Users

Hi, just made a trade for a broken poly 800. At first glance this is what I have noticed about my broken unit. Let me start by saying I have yet to open this thing up. I tried to reload presets and this had no effect on the board or its problems, I did it multiple times, it said "good" then I switched back to tape disable and it sounded the same, nothing changed at all. Unit powers on and seems to respond to parameter changes to an extent, for instance I can change deg1 attack value, and the display shows the parameter number I chose and the value I'm changing. it kinda effects the sound but it is clear that the sound is not right in the first place (it is like that with most of the parameters except the noise, dco levels and vcf functions don't seem to do much of anything), so some of the parameters seem to half work, I can hear them change but the overall sound just isn't right at all and has a loud hiss to it. In the background you can hear the sound playing but over that is the hiss. it's as if the noise generator is at full blast, the dcos are turned down (it doesn't sound like a ground hum) and the filter is open and at hi resonance. I can usually tell when chorus is on or off, the tune fader seems to work. The bend joystick doesn't seem to do anything. The headphone jack doesn't work. When it first powers on it wont make any sound, after about 30 seconds to a minute it starts to make a sound that starts with the filter cutoff low but slowly rising, I can take my finger off the key and it will stop, when I press back on the key it starts from where it left off on the filter cutoff envelope and eventually fully rises and stays that way. The sequencer seems to work, it just plays the messed up noise, I can change speed and I think I missed around the with steps. When the sequencer is on the display flashes, the flashes speed up when the sequence speeds up. All the keys function and you can hear the pitch of each key you press, but here's the weird part, you press a note and then you take your finger off and the note stops, then you play another key and it plays both notes together and so on. It's hard for me to explain most of this in a coherent way so my apologies, but hopefully you guys are getting a feel for the issues I'm having with my poly 800. Any suggestions would be great appreciated, I have a lot of solder experience but I don't know how to troubleshoot circuits or anything like that.

Thanks guys.