"Dominique" wrote in message
.. .
Hi, I have a digital rackmount synthesizer (Korg Wavestation AD) which
reboot after being ON for a while, sometimes many times in a row (fast)
making a sound like knocking on a door. (When I turn it on it makes "toc"
in the speakers so booting many times in a row makes this knocking sound).

I think it is a power supply issue because when computers have a reboot
problem it's usually caused by the PS. I am unable to get a new PS because
of the age of the thing so I thought replacing the electrolytic capacitors
on the PS board since I heard that those degrade with time.

Am I wrong about that? What other components might cause such behavior?

I also thought trying to fit a computer power supply. I managed to get the
service manual for the synth and it uses +12V, -12V and +5V, but the synth
only puts a load of 0.15A at +12 and -12 volts and a load of 0.8A at +5V.
I
read somewhere that PCs power supply can be unstable if the load is too
low.

Any thoughts or comments?

TIA




Dry joints on the Power Supply regulators are very common since they get
hot.

I would resolder everything on the power supply PCB, it won't take very
long. Clean all the connectors throughout the module you can find by gently
removing and reinserting them whilst you are at it. If all this doesn't
cure it you can then start wondering about faulty components.



Gareth.