There is a little 2 bank of dip switches just to the right of the diagnostics switch. Top switch (#2) should be on and bottom switch (#1) should be off.
If you haven't already, remove the sound board and reflow the solder to all the header pins. Same on the driver board. This era board is prone to developing cold solder joints on these header pins which can break the connection between the driver board and sound board preventing correct or sounds at all from playing.
Has this ever worked on this BK?
Newcastle, OK
