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

[Roman Sowa]

First of all, dust it off inside, remove all spider's nets, spider nest 
remainings, dead bugs and in extreme cases - mouse poo.

Disconnect everything from power supply, turn it on and let it run for 
15 minutes or so. Capacitors will reshape then by rebuilding oxide 
layer. Then't it's good time for checking voltages. If this is not far 
away from nominal, leave it, otherwise you'd have to recalibrate entire 
synth. If it fails at this point, close the case and stuff it somewhere 
for another 10 years till you have time to fix it.
Then maybe check PS under some load, like 10ohm resistor.

Next, connect power supply back, turn it on and quickly check if 
voltages do not drop considerably, which would indicate some short or 
unussual heavy load (like shorted tantal) somewhere and possibility of 
big blast coming in few seconds. If OK, check if it plays at all and all 
works as expected. If so, leave it on for next 15 minutes.

Roman

W dniu 2016-10-11 o 14:13, Barry Klein pisze:
> 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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