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

[Alexandre Souza]

Bill, sorry, 68K resistor.
Some info and photos here:
http://tabalabs.com.br/msx/yis303/


2016-10-12 19:17 GMT-03:00 Alexandre Souza <alexandre.tabajara at gmail.com>:

> 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
>>  >
>>  >
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>>  >
>>
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