[TinCanAlley]

Well I did a boneheaded thing. I decided to make all the adjustments noted in the SM before I got to the convergence as it says to do all the miscellaneous adjustments first. Things were going well until I went to adjust the ACC. I followed the instructions precisely, but the reactions weren't as expected. I was supposed to measure voltage for one point, then put the set into align mode and jumper two other points. From there I was supposed to read the voltage, then remove the jumper and adjust the ACC until the voltage matched the first value. I turned the ACC pot, but nothing happened. I rotated it back and forth a few times incase it was dirty. Still nothing. I forgot the mark the starting position, so I had to guess.

Anyway, I went back to the manual and I verified all the steps and ACC pot location. That's went I noticed the subcarrier board is different than the one I have installed. Mine is the updated board, so instead of the 9-27 I have the 9-69. Looking closer at that board, the ACC and APC are reversed from the 9-27. So that entire time I was messing with the APC. Looking over that adjustment, it says after adjustment I need to scope the RGB points and look for properly keyed rainbow waveforms. I'm assuming they are referencing the waveform examples on the schematic for those test points? If so, I need to get out my scope.

So what exactly does the APC do? It doesn't explain the function, just how to adjust and check. Also, what does the ACC do and how would I know if it was out of adjustment.