Im looking at how the values from cd4069 correspond to the fets. Based on the schem note that "switching fets. high gate V = off" it seems that some of the fets are "stucK" off. There are several places on the cd4069 with const high or low V.
On the right side of the schem at the top (below the chip diagrams) there are 4 transistors (pf3820). each one is associated with a,b,c, or d. These are points from the switch curcuit we have been exploring. Based on what im seeing, A is has a const Low V, and b,c,d have const high V. It would seem that the 3 of these transistors that have high V are stuck off, and they seem to be the ones associated with the drive/gain states. the 4th, associated with A is stuck on, which seems reasonable to my eye.
The huge assumption i made was that pf3820 is in fact a switching fet. If im reading this right, would that point to a bad cd4069 chip?