But I think the 4066 is the chip
you are trying to refer to.

Mike


I was doing this from memory, I haven't worked on one for a while. If it uses
4066s then the fault is probably with the micro. The 4066 is controlled by
logic levels, not a data bus. I would look for shorted clamping diodes on those
control lines before looking for a micro. There may even be driver transistors
which should be checked.

JURB