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NU67u Power Supply questions
Author: kelly votrenom
Date: 10/12/2017
Hi
I have an NU67u power supply that I just repaired, the filter caps were bad and the rectifiers got damaged.
The schematic I have isn't exactly accurate, it does not show the trimmer pot. Also, it shows - I believe- a 15v zener (GR3) in the 6.3 v supply; the zener on the board ends is Exx 1215 (the last two letters are not legible). The supply seems to working now but the 6.3v supply reads 12v. However, the zener seems to functioning. I do not have the mic associated with this supply to test, I am not sure that the owner knows exactly which mic the supply is for.
Is the 12v correct? The other voltages in the schematic seems to correspond with the schemo. I have asked in the past and received an answer on how to approximate loads to test a power supply but cannot locate my notes. Is there a suitable resistive load I can place on the supply for testing purposes (both heater and HT)?
Thanks
Mark Springer
industrial arts  
 
Reply
kelly votrenom
10/12/2017
Martin Schneider/Neumann
10/13/2017
Klaus Heyne
10/13/2017
kelly votrenom
10/18/2017