I got a used Astron SS-25 PS for free from someone a week ago and have been using it OK with my ICOM IC-476PRO for the past few days. Today I went to turn the radio on and the radio wouldn't come on. Checked all the cables, etc. first and then checked the output on the PS at the terminals and it's ouputting 2.2V. I grabbed a backup PSU I use and the radio works fine again. Not sure how to diagnose this. I opened up the unit and didn't see anything obvious. Appreciate any advice. I found this: http://www.n5na.net/s9y/index.php?/archives/28-Repairing-an-Astron-SS-25-and-SS-30.html. So a possibility would be removing the diodes and checking them?