Ah, sorry Don, I misread that in a hurry, I thought you were setting up the a/d converter. If only Leds 1-5 light then pay special attention to bits DO5 thru DO7! Let us know how you get on. Andy On 17/01/2010 12:57, "backshall1 (dsl)" <backshall1@bellsouth.net> wrote: > Hi Andy, > I'll check out the data bus and inhibits. No, the calibration did not go > well. LEDs 1 and 8 are supposed to light up, and I could only get 1 and 5. > Thanks, > Don B. > > _____ > > From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of > Andrew Jury > Sent: Sunday, January 17, 2010 7:35 AM > To: PolySix@yahoogroups.com > Subject: Re: [PolySix] Wrong functions controlled by knobs? > > > > > Hi Don, > > You almost certainly have track disconnections. Try and focus in on two > places of the 367. First the data bus DO0-DO7 and the multiplex address bus > INH1-3. Using your scope scope ensure that you have at least what look like > trains¹ of data pulse when you operate the controls. I find when dealing > with multiple problems like this it pays to select one of the problems and > focus in on it. Usually everything else will start to become apparent as you > make progress. Before you start, however, are you able to perform the reset > calibration procedure correctly? If you can verify this then we can proceed! > > Cheers, > Andy > > On 16/01/2010 13:56, "longenough2002" <backshall1@bellsout > <mailto:backshall1%40bellsouth.net> h.net> wrote: > >> >> >> >> >> >> Just got a Polysix in with some bizarre symptoms. It had an old battery >> in it that looked like it had just started to leak. Only a couple of >> traces had some black spots and still checked out okay with an ohmmeter. >> I put in a cr2032 and diode and it is saving patches okay. It's not >> until I twiddle some knobs that things start to get weird. Here is what >> works: Output, Bend, Tune, VCO, VCA, Arpeggiator, Key Assign, Programmer >> sections all OK. Problem sections: MG, VCF, EG, Effects. By Section: MG >> - Frequency, Delay and Mod work, but Level seems to be controlling VCF >> Cutoff, not modulation intensity. VCF - Cutoff does nothing, Resonance >> works when set between 5 and 10, but seems to control Attack when set >> between 0 and 5, EG Intensity does nothing, KBD Track works. EG - Attack >> does nothing, Decay works, but in reverse, as if EG Intensity is in the >> negative range. Release works between 5 and 10 but seems to do nothing >> between 0 and 5. Effects - switch works, but Intensity does nothing. >> It would seem the D/A is having serious problems, and I can't get LEDs 1 >> and 8 to light up during the reset procedure. I get 1 and 5. I wish the >> service manual had some voltages to measure, instead of just watching >> lights. The +/-15 and +/-5v supplies look good. Anybody have ideas where >> to start debugging this? I have a scope and multimeter, but no logic >> analyzer. Thanks for any assistance you can provide. Don B. >> >> [Non-text portions of this message have been removed] >> >> >> >> >> > > [Non-text portions of this message have been removed] > > > > > > > [Non-text portions of this message have been removed] > > > > ------------------------------------ > > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6Yahoo! Groups Links > > >
Message
Re: [PolySix] Wrong functions controlled by knobs?
2010-01-17 by Andrew Jury