from what I remember it should price to $1 from the factory. Can you provide a photo of the coin changer?

Pricing this machine is a 2 step process. You need to set the prices on the board with the dip switches for each price line A thru E in your case. Then you need to go to the board that is mounted under the trays. This second board will have a bunch of wires (1 for each selection). This board should also have A thru E marks on it. You need to move the individual selection wire to the correct price line.

Say you set price "A" to 75 cents. - you would need to move all of the individual selection wires you want priced to 75 cents to that price line.
If you have price "B" set to $1 - you move all of the selection wires you want priced to 1 dollar to that price line.

As I recall the selection wires are color coded - originally there would have been a sticker telling you what color went to what selection - hopefully it is still there.

The 6000 series was built from 1985 to 1991

The board is aftermarket - the 4000 series was built before validators where developed.

I assume you saw those while in mode 6 - they are not error codes they are a list of switch positions. You can find them on page 2.07, it appears that all of them should be there in normal operation.

What does the out of order message say as it is scrolling? It will say out of order M - something the M number is the actual error on the machine.