DL#015 - Kurzweil K2500X Repair Part 4 PLDs & FDD

Part 4 looking at this Kurzweil K2500X keyboard. Removal of the main board to replace three PLDs and completely failing to sort out the floppy disk drive. Part 3:    • DL#014 - Kurzweil K2500X Repair Part 3 - L...   Part 2:    • DL#012 - Kurzweil K2500X Repair Part 2   Part 1:    • DL#011 - Kurzweil K2500X Repair Part 1