Quote:
Originally Posted by old_tv_nut
Didn't realize this is a transistor set. Can you post a pic of the horizontal/flyback/yoke schematic?
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I thought I mentioned that but I see now that I forgot. I did post it in the solid state section of the forum though.
It is a bit of an odd one compared to what I'm used to as it's a fully solid state set but an early design with a lot of aspects that remind me of older vacuum tube sets and it has a delta gun tube.
Hopefully these are legible, the max resolution and file size for attachments on this forum are seriously limiting, even for 20 years ago but it is what it is. The HV protection circuitry in this set is simpler than what is shown in the schematic and lacks Q303 and associated parts that will trip the HV shutdown if the beam current is excessive. C36 on the output of the horizontal drive transformer was bad and when I found that I thought sure it would fix it but replacing made no difference. C305A, C305B and C305C are the safety capacitors which I replaced but again that made no difference so I will probably put the original Sprague orange drop parts back in. The schematics do have some scope captures but they are teeny tiny images without a lot of detail and no indication of the bandwidth of the scope used to capture them or even the horizontal sweep setting and they don't even show the graticule. I have looked at more of the signals with the scope than I posted here and everything I checked looked fairly close to what it shows.