Quote:
Originally Posted by TinCanAlley
My first task is to measure B+ and scope it. I will start at the test point and from there, test and scope at all the in and out points on each module. From the schematics I see that from the regulator it goes in this order: Chroma-->Subcarrier-->Video Processor-->Vertical-->Horizontal-->125V source for a complete loop. I want to do this before and after recapping and other diags to see if there is any noticeable change. I figure if it starts out clean, then gets noisier, I can pinpoint the issue better.
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I just want to make sure you know not to scope the B+ unless your set is plugged into an isolation transformer, or you're using an entirely battery powered scope. You cannot scope anything in the set without isolating it or using a battery powered scope because the neutral line will short out to the ground lead on your scope probe because the neutral and the earth are connected at the circuit breaker.
I would, in general, recommend that an isolation transformer always be used for doing any live testing on a set, no matter how safe you think you're being, but I know not all people will do that.
Sorry if this is unneeded advice, but I just wanted to make sure that at least someone said this to you.