[sdiy] Advice?: Powering up a vintage keyboard after several years

[Alexandre Souza]

Bill, there is a common failure on your cx5 that does just that. You need
to change a 0,68r resistor (a big, blue one) which changes value and causes
start up failures. It happens on ALL cx5ms and its derivatives. I'm mobile
now but at home I can give you more detailed info.

Enviado do meu Tele-Movel

Em 12/10/2016 02:19, "bill bigrig" <billbigrig at yahoo.com> escreveu:

> My Yamaha CX5s and Sequential Circuits boards all wake up fine after doing
> on/off cycling. Sometimes it takes a couple days, but it's always worked.
> Rig
> --------------------------------------------
> On Tue, 10/11/16, Barry Klein <barryklein at cox.net> wrote:
>
>  Subject: Re: [sdiy] Advice?: Powering up a vintage keyboard after
> several      years
>  To: synth-diy at dropmix.xs4all.nl
>  Date: Tuesday, October 11, 2016, 7:58 AM
>
>  What do you think the odds are that
>  I'm going to have an issue?
>  Say on a Memorymoog.  The damn thing has so many CMOS
>  parts that croak for
>  whatever reason.  Was it because the owner powered it
>  up infrequently?
>  Was it because of weak output caps in the supplies?  I
>  tend to think the
>  parts just crap out over time because of manufacturing
>  process flaws. I
>  tested the output caps with my LC102 on the memorymoogs (3)
>  that I repaired
>  and they were fine - the parts just went bad.
>  Otherwise, bad caps, use the
>  synth multiple times you will just as likely see failures
>  with a lot of use
>  rather than after 5 years I would assume...
>  Like on the Andromeda's I had been looking at recently - the
>  CPU just seems
>  to die and needs to be replaced.
>  Have you really seen power supply faults in a pretest like
>  you suggest?
>  Without a load I wonder if the issues even show up.
>  I guess I'll let you guys know the score after I try them
>  all....
>
>  Barry
>
>
>  -----Original Message-----
>  From: Michael E Caloroso
>  Sent: Tuesday, October 11, 2016 7:17 PM
>  To: Barry Klein
>  Cc: synth-diy at dropmix.xs4all.nl
>  Subject: Re: [sdiy] Advice?: Powering up a vintage keyboard
>  after several
>  years
>
>  If it's any synth with CMOS or CEM or SSM ICs in it, verify
>  the power
>  supply FIRST.  If a rail is missing or over spec it can
>  blow these
>  things.  The last thing you want are blown CEM/SSM
>  ICs.
>
>  MC
>
>  On 10/11/16, Barry Klein <barryklein at cox.net>
>  wrote:
>  > Well, that’s me....
>  > If the consensus is just plug it in I’m good but if
>  it is check the
>  > supplies
>  > first....  memorymoogs, prophet 5, lesser
>  synths...  I’d just leave them
>  > off
>  > – don’t need the added grief right now.
>  > No way am I going to tweak up the memorymoog supplies
>  and go through
>  > calibration of them again... at least not now.
>  > Maybe the Variac is just a thing for tube-based things
>  like old ham sets
>  > or
>  > guitar amps?
>  > I have 2 (transistor(ized) ham tranceivers and a Drake
>  receiver that I
>  > need
>  > to try too.
>  >
>  >
>  > Barry
>  >
>  >
>  > From: Jason Proctor
>  > Sent: Tuesday, October 11, 2016 6:35 PM
>  > To: David G Dixon
>  > Cc: Barry Klein ; synth-diy DIY
>  > Subject: Re: [sdiy] Advice?: Powering up a vintage
>  keyboard after several
>  > years
>  >
>  > have someone who knows what they're doing check at
>  least the PSU first?
>  >
>  >
>  >
>  > On Tue, Oct 11, 2016 at 6:25 PM, David G Dixon <dixon at mail.ubc.ca>
>  wrote:
>  >
>  >   Plug that shit in!
>  >
>  >
>  >
>  >
>  ------------------------------------------------------------
> ----------------
>  >     From: Synth-diy [mailto:synth-diy-bounces at dropmix.xs4all.nl]
>  On Behalf
>  > Of Barry Klein
>  >     Sent: Tuesday, October 11, 2016
>  5:14 AM
>  >     To: synth-diy DIY
>  >     Subject: [sdiy] Advice?:
>  Powering up a vintage keyboard after several
>  > years
>  >
>  >
>  >     I am going through the stuff in
>  my garage.  I have several vintage
>  > synths – some worth quite a bit now – and they
>  haven’t been powered in at
>  > least 5 years.
>  >     What would you recommend –
>  advancing on a Variac, or just plug it in?
>  >     Barry
>  >
>  >
>  >   _______________________________________________
>  >   Synth-diy mailing list
>  >   Synth-diy at dropmix.xs4all.nl
>  >   http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>  >
>  >
>  >
>
>  _______________________________________________
>  Synth-diy mailing list
>  Synth-diy at dropmix.xs4all.nl
>  http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20161012/b64b147f/attachment.htm>