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

[bill bigrig]

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
 >
 >
 > 
 
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