How to determine if you have a detection problem in your drive thru. You will need to generate an archive report (Fast Track PC software) or Daily Report from the main console. Now compare the number of cars at Menu, Cashier and Pick up or Menu and Pick up in one window scenarios. Each sensor should be triggered once per car so the number are cars at each event should be very close to each other. If there is a large difference between detection points, this indicate that you have a detection problem and may need a technician visit.
Before contacting a technician, you may want try a Vehicle detector calibration - LMA1400-MS