Check the listing for details. DIXIE NARCO 5591 BEV MAX VENDING MACHINE OPTICAL EYE SENSOR OVERRIDE JUMPER. Condition: New. Listed at 19.99 USD. Snack Attack Vending LLC is offering (1) Dixie Narco 2145, 3561 & 5591 Bev Max Optical Eye Sensor Override Jumper for the Bottle Drop Vending Machine. If you are having problems with machine sounding a series of beeps from optical eye sensors. Than this jumper is a must have! Very simple installation - Look for the main control board, located above that is small optical sensor board. Power down machine and unplug the harness leading to the main control from small board. Replace with jumper. Also, you will have to program to disable drop sensor & delivery sensor by pressing blue mode button on door. Note: If you have the Energy Star refrigeration unit than you will need (2) jumpers. Unplug the (2) optical sensor connections at small board and replace with jumpers.