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Strange Poly800 problem..sequencer button..kills memory? Midi..kills memory?

RE: [vintagesynthrepair] Strange Poly800 problem..sequencer button..kills memory? Midi..kills memory?

2008-01-22 by Joan Martínez

Try to start your sequencer program with Midi cables out of the poly.
It's a well known problem.
Regards.
Joan M.
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-----Mensaje original-----
De: vintagesynthrepair@yahoogroups.com [mailto:vintagesynthrepair@yahoogroups.com]En nombre de Robert Weigel
Enviado el: martes, 22 de enero de 2008 10:05
Para: vintagesynthrepair@yahoogroups.com
Asunto: [vintagesynthrepair] Strange Poly800 problem..sequencer button..kills memory? Midi..kills memory?

Wow how bizarre. Every time I hit the sequencer button it erases all
the patches. Anybody ever seen anything like this? Battery is good.
I dunno. Wish diagrams were a little easier to read on that one. -Bob

Re: Strange Poly800 problem..sequencer button..kills memory? Midi..kills memory

2008-01-22 by duncan

>>It's a well known problem.<<

not in our house, it isn't.... :-) 

this sounds like an actual fault- is it possible that the battery or
something else (leaky capacitor?) has damaged the pcb near the main
processor? 
there isn't a way, afaik, to completely wipe the memory through the
UI, but there is probably a "clear" input on the memory IC itself; you
may have a damaged track on the pcb or something flapping around on
one of the data buss lines that misreads the sequencer command...

does it end up with anything sensible in the patch locations or is it
garbage? do you end up with 64 patches the same?

damn. I thought poly800s were quite robust, too....

duncan.

RE: [vintagesynthrepair] Strange Poly800 problem..sequencer button..kills memory? Midi..kills memor

2008-01-22 by Scott Nordlund

I used to have a Poly 800 II- as far as I can remember, Poly 800 line had really horrible and buggy midi implementation. It only understands the simplest messages, and some kinds of data that it doesn't understand will crash the CPU and fill the memory with garbage. If possible, try to filter your midi data and test which kinds of messages it can reliably handle (you might start by filtering out everything but note on/off, pitch bend, and mod wheel).
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To: vintagesynthrepair@yahoogroups.com
From: piniflopa@...
Date: Tue, 22 Jan 2008 10:31:29 +0100
Subject: RE: [vintagesynthrepair] Strange Poly800 problem..sequencer button..kills memory? Midi..kills memory?


Try to start your sequencer program with Midi cables out of the poly.
It's a well known problem.
Regards.
Joan M.
-----Mensaje original-----
De: vintagesynthrepair@yahoogroups.com [mailto:vintagesynthrepair@yahoogroups.com]En nombre de Robert Weigel
Enviado el: martes, 22 de enero de 2008 10:05
Para: vintagesynthrepair@yahoogroups.com
Asunto: [vintagesynthrepair] Strange Poly800 problem..sequencer button..kills memory? Midi..kills memory?

Wow how bizarre. Every time I hit the sequencer button it erases all
the patches. Anybody ever seen anything like this? Battery is good.
I dunno. Wish diagrams were a little easier to read on that one. -Bob



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