Optical Scientific Inc
OFS 2000CW User’s Guide
P/N 1910-905
Rev. 03/28/13
58
11.4.2 Receiver "Signal" Led Not Lit
Be sure the transmitter is transmitting
Be sure the light beam path is unobstructed and the windows are clear.
Check alignment as shown previously in this document.
Be sure the receiver module wiring is firmly connected.
Replace the receiver module.
Replace the receiver PCB.