RCA CTC 120, weird tuner issue

[damen]

There are two trim pot controls located in the top left corner of the chassis. They are labeled "AFT balance", mark where they are and see if adjusting them makes any difference, if not, set them back where they were. If the controls don't help, aligning the AFT crossover coil may help. It should be labeled on top of the metal shield L304 on the left side. To adjust the coil, with the set on and tuned to a channel, turn the coil slightly in one direction, less than one turn, then interrupt the signal by switching to 04, the back to 03. Each time the coil is turned the set needs to fine tune itself that's why the signal must be interrupted. Also check and clean the sharpness control on the back apron of the chassis. The sound may be cleared up by aligning coil L201, it's just in front of the audio IC where the speaker wires connect. This coil uses a different alignment tool than the AFT coil one. There should be a paper chart in the cabinet that show these parts locations.