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2002-03-26 by Brian Andrew Marek
Okay, so I got the Prophet 600 working (changed out the Z-80 - easy!), but now I'm finding another problem. Apparently one or more of the oscillators are out of tune, even after doing the auto-tune thingie on the board. What could be causing this, and how would one remedy it? Thanks BaM -- Find out more about Rocket Park at our web page: http://www.rocketparkmusic.com/
2002-03-31 by Bill Fox
-----Original Message-----
From: Brian Andrew Marek <bmarek@...> >Okay, so I got the Prophet 600 working (changed out the Z-80 - easy!), >but now I'm finding another problem. Apparently one or more of the >oscillators are out of tune, even after doing the auto-tune thingie on >the board. What could be causing this, and how would one remedy it? Perhaps the capacitors associated with an oscillator's pitch have gone bad. Replace 'em on one oscillator and see if that helps. Cheers, Bill billfox@... http://wdiyfm.org/programs/emusic =============================================================================== Host of EMUSIC, an electronic, ambient, and space music show. Thursdays at 11 pm on WDIY 88.1 FM, Allentown and Bethlehem and 93.9 FM in Easton and Phillipsburg. Email me if you wish to submit music for airplay consideration. Radio Station Home Page: http://wdiyfm.org Personal site: http://www.users.fast.net/~billfox To subscribe to the EMUSIC on WDIY list, go to http://groups.yahoo.com/group/emusic-wdiy and click on [Join This Group!] SOUNDSCAPES Concert Series: http://www.tadream.net/soundscapes
2002-03-31 by The Old Crow
I had a really odd pitch problem on one VCO of a Prophet-600: for some strange reason a 42.2K resistor decided it would be a 30K resistor. It was not physically broken, and still measured 30K after removal. Installing a new resistor fixed things. If I recall, the resistor was in series with the scale trimpot. Crow /**/