Harrison:
See Schematic FO-10
+95V originates at T550 - 1/2 wave rectifier D582, filter C582, L582 - jumper - C584, CR584 - TP+95V
Dick K9FFK
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On 8/6/2020 10:14 AM, buma7@... wrote:
Greetings; I am more of a mechanical guy than electronic guy. That said I am trying to troubleshoot a 465M scope that has no trace, no trace with beam finder, no +5V nor +95V. I was testing for the +95V at the TP on the left side of the A11 Interface board forward of the power supply area and the +5V on the TPs on each side of the A11 board (right side in the rear and left side outboard of the +95V TP.. Unit does power up and CRT illumination is present. I am using a Air Force Service Manual (465M Operation and Maintenance) that I found on line. I have been tracing +5 voltage from the T700 transformer forward. Things seem good before the Q742 transistor. After the transistor I was looking for +4.9V and had -0.121V (basically zero. Q742 is a 2N222 NPN transistor. My thought was to replace it to see if that restored the +5V. My issue with the +95V is I at a loss to determine where the +95V originates. I would really appreciate some "adult supervision and guidance" on both the +5V and the +95V issues and any suggestions, advice and guidance in general. Thank you very much. Stay safe and healthy. Harrison N1FAM
