Tektronix 475 No Trace

[michelk005@gmail.com]

I have a 30 year old Tektronix 475 that I have a problem with.  It powers on, no trace.  I have opened it up and per the service manual checked all the LV power supply values and they are all within specs.  What I believe is the issue is no High Voltage.  Does anyone have any experience with a similar problem that was related to the High Voltage section that can share any troubleshooting thoughts.

Thanks,
Keith

[tautech]

Welcome to the forum

Start with this:
http://www.sphere.bc.ca/test/tek-parts/troubleshooting-scopes.pdf

[Addicted2AnalogTek]

I've been starting my old Tek scope repairs by doing a very thorough cleaning of all the switch contacts and dripping some deoxit down the pot shafts and working them around, and also re-seating all of the socketed components.  If it hasn't been used/running properly fairly recently, then this would be a great place to start.  Then you can get a good idea of what is really wrong without having to worry about bad contacts.

On both my 465 and 468, doing this solved a number of issues that the scopes had.    Hope this helps!