Landice L Series Diagnostic And Service Manual page 39

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SPD (yellow) – The SPD LED flashes on and off (relative to speed) when the speed sensor is
operating properly.
GRD (red) – The GRD (GRADE) LED should NEVER come on. It illuminates only when the elevation
potentiometer becomes out of calibration.
SERIAL (red) – The SERIAL LED should NEVER come on. It illuminates only when there is an interruption
of the flow of data between the upper and lower boards. This could be a loose or pushed pin on the main
wire harness.
+5V (green) – The +5V light comes on when there is power going to the Upper Display. If the light is not
on check wire harness for connections. If it is not the wire harness then the MCB is defective.