Vintage Synth Repair

Sounds like a bad 5V regulator or perhaps a cold joint on one of the pins? Does the DC look ok on an o-scope when unloaded?

  ----- Original Message -----
  From: plat@...
  To: vintagesynthrepair@yahoogroups.com
  Sent: Saturday, December 21, 2013 6:03 AM
  Subject: [vintagesynthrepair] Jupiter 6 PSU.



  Hi everyone .

  I am working on a Jupiter 6 PSU and I am having problems with the 5v dc.
  It seems that when the psu is disconnected from the synth then everything is fine and all readings are correct.
  However, when I connect the PSU to the synth I lose the 5 volts, they drop to about 0.7v.
  +-15v stays intact and I get the somewhat classic blinking light on the LFO 2 board.

  It seems that whatever card I plug in I lose the 5v so it seems like a PSU problem rather then something downline.

  Any ideas to help me get this synth up and running?

  Thanks
  Arnar