|
Gonna go Oh Yea when ya hear this one.
Brief raster on the left dark screen with close focus. Drum roll please
The focus rectifier! Likely shorted. After seeing decent signal on the scope (after soldering all the parts in the area and grounds I still had the strange symptom yet wave forms and DC on the CRT grids and cathode looked good. The last thing to ponder "the focus grid. The voltage was a bit rich in AC content so a rectifier change was in order. I also discovered the previous person had a 100 ohm resistor in place of the 1 meg in series with the focus lead also.
I now have a picture in near focus but a unresponsive focus control. I can now view a picture and see there is much to do like AGC and sync issues. Vertical gain next, then color. The CRT is looking decent but the cap is scary loose and I've had to re-flow the solder in some of the pins.
Any suggestions to secure the base to keep it from moving short of JB weld? I don't want wires to break from movement
Progress is being made
|