[Al Skierkiewicz]

Yarden,
Try connecting the light directly to an unused output on the PD to see if it comes on. If the digital sidecar is feeding the signal light, there is an LED on the board next to the RSL white, two pin connector on the DSC. If that is not coming on, the RSL will not work. The LED is in parallel with the connector. It is also possible for a student to terminate the connector without actually having the wire electrically connected. If all else fails, on rare occasions, the LED may actually be defective.