Yamaha CS80

Hi Wayne,
If you are tech enough, I suggest you that you unplug the output of the power suppy and load it with a dummy (resistors) load.
I don't remember the resistors values for each output accordig to the voltage and nominal it should drain.
As a general gude think of resistors of low values (less than 50 ohms) and more than 15Watts.
 If you need a help with this let me know.

This way if any voltage output is out of its nominal value, you don'y blow ICs (VCAs, VCFs, VCOs., etc.).
I don't suggest you using a variac.
I should have some parts of the manual over there, if you don't find it in another place let me know and I will look for them.


GEEG.

  ----- Original Message ----- 
  From: Wayne Griffin 
  To: yamahacs80@yahoogroups.com 
  Sent: Saturday, November 10, 2007 3:15 PM
  Subject: Re: [yamahacs80] dormant CS-80 proceedure


  Thanks guys! I am absolutely no stranger at all to the
  recap operation. I have a lot of gear and have rebuilt
  several power supplies.

  Regarding the caps, should I go all out "Computer
  Grade"? What brands and temp ratings have you all used
  in your rebuilds?

  Has anyone ever tried the variac thing with an old
  synth? 

  I was thinking I could ramp up the voltage over the
  course of about a day- but I wasn't really certain how
  the regulators would take to that. I thought you could
  ramp it up and then hit the reset line on the CPU but
  maybe that's just wishful thinking.

  Should the regulators be changed as well?

  I don't have the service manual to the CS-80. Can
  anyone tell me what the electrolytic values are? Where
  is the best place to obtain a copy of this legendary
  doc? cheers, [w]

  --- rj krohn <r_j_d_2.phila@...> wrote:

  > good instincts. changing the psu capacitors is not
  > too hard. youll probably have to order the
  > 5600mfd/40v caps, other values should be at your
  > local store. digikey is quick delivery/processing if
  > youre in the states, might as well get em all there.
  > 
  > its always a smart preventative idea. seems like a
  > waste of time until that one time you power up
  > something, a cap fails, and you wind up burning out
  > something downstream. that's a REAL pain. been
  > there, it blows. 
  > 
  > Wayne Griffin <ingsoc_1979@...> wrote: 
  > I have a CS-80 (#1480) that
  > hasn't been powered on in
  > years. I am afraid what might happen if I just flip
  > the mains switch.
  > 
  > Are there any recommendations on what's the best
  > method to bring one back up that's been off for so
  > long? I thought I might try and use a variac. Let
  > me
  > know please. cheers, [w]
  > 
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