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Tek 575 curve tracer, single family position not working


 

Hello everyone,
My name is Jack, and I have a 575 that I am trying to understand better, and to calibrate and fix a couple of small things. The present issue is that I can’t get the single family switch on the step generator to do anything. The repetitive position works as it should, but switching to single family makes all curves displayed on repetitive, disappear.
I have the instruction manual for the instrument, and the schematics for all the different blocks. I have cleaned the switch contacts, but am at a loss.
Any suggestions for me would be greatly appreciated. I have very limited diagnostic capabilities.
Very sincerely,
Jack