Connect power to EasyKey.
Verify that the cable is correctly connected. See Installation manual.
Verify condition of fuse and replace if necessary. See Repair-Parts manual.
Verify that the cable is correctly connected. See Installation manual.
Verify that the cable has not been cut or bent at a radius smaller than 1.6 in. (40 mm).
Disconnect fiber optic cable ends and clean with a lint-free cloth.
Replace cable.