I appreciate all your efforts so far in trying to show how to get this poor thing a new lease on life. Clever shaft mods sir! It sadly was abused and very neglected by previous owners.
Hi. i will follow your repair and try to help as much possible..the picture bending or pincushion like you said, almost like the picture is trying to run away horizontally is likely an agc problem, the signal is too strong and is overloading... also the vertical is wrong with those thick lines....those 2 problems will greatly affect the sync so your sync may not have any problem... see if you have an agc adjustment and reduce it , and if not, atleast try to turn down the contrast a bit...and also see if you have a bad potentiometer on the vertical section. also a capacitor you installed can be wrong and cause that, its very common to fit a 10nf instead of 100nf and vice versa.. sometimes the vertical runs at half or twice the frequency..while it locks because its running at a multiple of the 50 or 60hz ,it displays thick lines, multiple pictures, picture cut in half etc etc etc...also it could be excessive height but i dont think thats the case there.....Also the lines are much wider at the top so the linearity is also bad. i bet on a wrong capacitor.... grossly misadjusting the vertical linearity also makes the picture impossible to lock properly even horizontally...the circuits are very interactive one with the other
That’s very kind of you to lend your expertise. There is something strange about the sweep: The lines look too far apart. In the video (part 5) I had adjusted brightness and contrast for the best picture. Back to the vertical oscillator! I do have to measure the AGC though. There are no adjustments for it, so if it’s way off something else is going on. There are very few electrolytics in this set: I think there is only one which is not for supply rail decoupling. That one is in the Ratio Detector. All the potentiometers seem to be alright. The resistance elements are not open and there are no dead spots. But it is possible that I messed up a decimal point and installed the wrong size capacitor somewhere. It happens! That is something that I’m going to have to check very carefully. But I’m also going to go back and start looking at the capacitors I did not check, i.e., the mica capacitors. I think there’s more than one thing going on. I’ll report back to you once I’ve had a chance to do some tracing & measuring. Thanks again…!
I appreciate all your efforts so far in trying to show how to get this poor thing a new lease on life. Clever shaft mods sir! It sadly was abused and very neglected by previous owners.
Thanks. 😊 This set’s sucking the life out of me!
Hi. i will follow your repair and try to help as much possible..the picture bending or pincushion like you said, almost like the picture is trying to run away horizontally is likely an agc problem, the signal is too strong and is overloading... also the vertical is wrong with those thick lines....those 2 problems will greatly affect the sync so your sync may not have any problem... see if you have an agc adjustment and reduce it , and if not, atleast try to turn down the contrast a bit...and also see if you have a bad potentiometer on the vertical section. also a capacitor you installed can be wrong and cause that, its very common to fit a 10nf instead of 100nf and vice versa.. sometimes the vertical runs at half or twice the frequency..while it locks because its running at a multiple of the 50 or 60hz ,it displays thick lines, multiple pictures, picture cut in half etc etc etc...also it could be excessive height but i dont think thats the case there.....Also the lines are much wider at the top so the linearity is also bad. i bet on a wrong capacitor.... grossly misadjusting the vertical linearity also makes the picture impossible to lock properly even horizontally...the circuits are very interactive one with the other
That’s very kind of you to lend your expertise. There is something strange about the sweep: The lines look too far apart. In the video (part 5) I had adjusted brightness and contrast for the best picture. Back to the vertical oscillator! I do have to measure the AGC though. There are no adjustments for it, so if it’s way off something else is going on. There are very few electrolytics in this set: I think there is only one which is not for supply rail decoupling. That one is in the Ratio Detector. All the potentiometers seem to be alright. The resistance elements are not open and there are no dead spots. But it is possible that I messed up a decimal point and installed the wrong size capacitor somewhere. It happens! That is something that I’m going to have to check very carefully. But I’m also going to go back and start looking at the capacitors I did not check, i.e., the mica capacitors. I think there’s more than one thing going on. I’ll report back to you once I’ve had a chance to do some tracing & measuring. Thanks again…!