I have a 54645D scope that appears to have a dead power supply board (plug unit in, turn it on and nothing happens, the fan does not spin, and nothing appears on the screen). I don't know the history of the unit and I don't know when it stopped working and what happened to cause it to stop. The part number for the power supply is 0950-2735. I know this power supply board is used in the following products: 54615B, 54615T, 54616B, 54616C, 54645A, 54645AN, and 54645D. I am looking for a schematic for this supply board to try to troubleshoot it. I would also be interested in a source to purchase a new (or used) power supply board from. Also any tips you might have on troubleshooting this board would be much appreciated. Thanks in advance for any information you can provide.