from TB-303 resources mailing list -------[ http://www.tb-303.org ] ---------------------- >From: "Trevor Page" <[EMAIL PROTECTED]> >Reply-To: [EMAIL PROTECTED] >To: <[EMAIL PROTECTED]> >Subject: Re: [TB-303.org] >Date: Thu, 21 Mar 2002 23:22:10 -0000 > >from TB-303 resources mailing list >-------[ http://www.tb-303.org ] ---------------------- > > >----- Original Message ----- >From: "David Joeright" <[EMAIL PROTECTED]> >To: <[EMAIL PROTECTED]> >Sent: Monday, March 04, 2002 11:08 PM >Subject: Re: [TB-303.org] > > > > from TB-303 resources mailing list > > -------[ http://www.tb-303.org ] ---------------------- > > > > The only way to replace the CPU is to get it from another 303, or >someone > > who has an extra or collects the parts. Sometimes you can get broken >303s > > for a good price, but they seem to be scarce these days. Just out of > > curiosity how did you determine it was the CPU, did you take it in for > > service ?? Or did you determine this yourself ?, if so how did you test >it > > ?? > > -- > > > > > >It's important to be absolutely sure that the CPU is at fault. I've had >several 303's to repair which previous so-called 'techs' have blamed the >fault on the CPU, only to find that it was in fact one or more of the three >memory IC's that were in need of replacement. A faulty memory often causes >bizarre effects which can quite easily be blamed on the CPU. > >Power supply faults shouldn't be ruled out either - an undervoltage or >significantly noisy power supply to the digital section will cause trouble. >You see lots of Roland gear with slightly buggered power supply circuits >usually because someone's used a wallwart of an incorrect voltage at some >point. Relatively unlikely but nevertheless a possibility. > >I've actually got one or two original TB303 CPUs which were the last I was >able to get from Roland some time ago. Never had to use one yet. Faults >have >almost always been attributed to one of the above in my experience. > >Trev > > >-------[ http://www.tb-303.org ] ---------------------- >Subscribe & unsubscribe there : >http://www.tb-303.org/ >
One of my 303s makes a click before every note that it plays. This click does not get louder or softer when I adjust the volume. When the volume is turned all the way down, the click is still audible. Could this be the CPU? or could it be the poor installation of a 3 socket kenton Mod? _________________________________________________________________ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx -------[ http://www.tb-303.org ] ---------------------- Subscribe & unsubscribe there : http://www.tb-303.org/
