[sdiy] OB-8 Battery Replacement/OB-8 ECOs Online?

[Magnus Danielson]

From: Doug Terrebonne <dougt55 at yahoo.com>
Subject: Re: [sdiy] OB-8 Battery Replacement/OB-8 ECOs Online?
Date: Sat, 29 Jan 2005 02:12:21 -0800 (PST)
Message-ID: <20050129101221.44789.qmail at web81205.mail.yahoo.com>

> Cool, glad to have them back! I'm trying to troubleshoot my own OB-8 right
> now (randomly resets itself, 2 voices won't tune, some buttons not working,
> etc)...

You do know that autotune fails when oscillators is too much of scale. You may
also experience that they are not able to feedback to the frequencycounter
(the 8253 chip).

> Anyway to the guy who needs to replace the battery - read this first -
> http://rubidium.dyndns.org/~magnus/synths/companies/oberheim/ECO425.jpg

Indeed.

Cheers,
Magnus - out of town emailing over TTY

> Doug
> 
> --- Magnus Danielson <cfmd at bredband.net> wrote:
> 
> > From: Doug Terrebonne <dougt55 at yahoo.com>
> > Subject: Re: [sdiy] OB-8 Battery Replacement/OB-8 ECOs Online?
> > Date: Sat, 29 Jan 2005 00:28:52 -0800 (PST)
> > Message-ID: <20050129082852.37888.qmail at web81208.mail.yahoo.com>
> > 
> > Doug,
> > 
> > > If you have ROM version A6 or later I *think* the envelope cals are stored
> > to
> > > tape when you do a backup... Does any one have the OB-8 ECO docs online?
> > The
> > > links on Magnus' site are all dead... 
> > 
> > I've been out of disc so I didn't bring them on my server. If you try now
> > (make
> > sure to reload the page, the links have changed) you will find all the ECOs
> > that I've got online!
> > 
> > I'm getting out of town over the weekend, so I will probably not be able to
> > answer any emails again until tomorrow evening (late CET). Enjoy the ECOs.
> > 
> > If you got any EPROM version other that A8 and B5, please let me know. I
> > would
> > become happy to have an image of them, so I can put it on the server.
> > 
> > As for the issue of changing battery. You do want to read the service manual
> > http://rubidium.dyndns.org/~magnus/synths/companies/oberheim/
> > and there you have all the necessary details on how to *create* the data.
> > You can do tape backup, but every once in a while you may want to tune it up
> > from bottom anyway, and it doesn't take that much time. Beware that the
> > filter
> > tuning should be done in the upper end of the keyboard rather than the lower.
> > The highest note should be played for offset and an octave down for the
> > scale.
> > I don't think there is anything in the manuals about this. Maybe Tony and
> > Jürgen have any more info to share on this?
> > 
> > PS. I had this optical distorsion on my labbench yesterday:
> > http://rubidium.dyndns.org/~magnus/synths/temp/whatda.jpg
> > 
> > Cheers,
> > Magnus
> > 
> > > Doug
> > > 
> > > --- doof <doof at cox.net> wrote:
> > > 
> > > > Greetings all,
> > > > 
> > > > I need to replace an aging battery in my OB-8, has anyone carried out
> > this
> > > > procedure before?  I assumed it would be an easy swap until I read
> > somewhere
> > > > on the web that system calibrations (particularly envelopes) are stored
> > in
> > > > memory- is this correct?
> > > > 
> > > > Has anyone carried out this procedure?  Tips and advice would be great,
> > tia.
> > > 
> > 
>