August 7, 2024 Day 94
OK, I really do have High Voltage! My H.V. meter that has been very reliable for over 40 years lied to me! As I moved the schematic to a different part of the bench, I noticed the hair on my arm standing up when close to the CRT face. I swapped out the H.V. probe and it measured 16 KV. So, that is not enough, but good for now!!
Pix 1 First image on this set for likely many years shows no sync, or maybe AGC issues. Hard to say. But I am going after the Horizontal Osc. board next.
Pix 2 Parts removed. I replaced every part on this board except for the coil, which is obviously OK. All caps are new. Some resistors looked tired so they got replaced good or bad.
Pix 3 Rebuilt Horizontal Osc. board.
Pix 4. First good image with color. I still suspect maybe there is an AGC intermittent, but this is a milestone in the restoration process since it tells me a lot about the rest of the set.
https://visions4netjournal.com/wp-co...3-no-sync.jpeg
https://visions4netjournal.com/wp-co...sc.-board.jpeg
https://visions4netjournal.com/wp-co...Rebuilt-2.jpeg
https://visions4netjournal.com/wp-co...ood-image.jpeg
There is still a lot of work to be done. I installed 2 brand new 5U4 tubes and the power supply voltages are now what they should be. I have tested all of the tubes and found several weak ones and they have been replaced. There are a number of controls that have issues and I am not sure if cleaning them will help. Most of them have to do with convergence. I may be facing some rebuilding of controls like I did with the volume/brightness/switch unit. Time will tell. Next, I plan on going after the Sync/AGC/Sound I.F. section. Even though the High Voltage is low, I am not too concerned with that for now. It should be 22KV.
Onward, Mike