If your NXT brick has been sitting in a closet for years, ensure you have the latest firmware (v1.31) to avoid bugs when running the programs associated with the PDF instructions.
The most complex mechanical build. It uses a conveyor system to sort red, blue, and green elements. lego mindstorms nxt 2.0 building instructions pdf
The most reliable source is the LEGO Customer Service website. Search for set number 8547 . If your NXT brick has been sitting in