|
will do. I have been having fun looking at the various test points, I think I am begining to get a handle on how all this works, I can see the video amplitude along with what I presume is the horz sync, then the vert all riding below the video. Then after going thur the sync separater just the horz and and the vert. I assume the video is clipped off based on the bias of th sync tube, then the horz and vert use different band pass filters (the integraters) to isolate the correct sync (vert and horz) to trigger the osc (vert and horz). At least that seems to be the way its working. I am an accountant by trade so all this stuff is new to me, so please be patient if I ask any dumb questions, its all OJT for me.
I did check two TP's the video dector output and the vert amp output, besides being inverted (to be expected in a voltage amp) there was gain but not much, like 2.5X if my scope was reading right. I dont know what the gain should have been on that stage.
I am going to check the bias of the vert amp and if cathode bypassed I will check that as well.
The set is workiing fine, but I have a hard time leaving well enough alone, I just dont like the narrow range of vert lock, and that darn jagged hammer. I checked a couple of my other sets, same vintage diff make, and while there was some jagged edge it was very small.
|