The first thing I would check is the temperature in the freezer (it suppose to be bellow 12°F) and the water feeding tube into the ice maker for any blockage.
If there is a water filter - how old is it?
Remove the ice maker head cover and check for 120VAC between "N" & "L" test points. Make sure the test probes are 1/2" in.
If there is 120VAC then using an insulated piece of wire (14 GA), short points "T" & "H" to run the motor. Leave the jumper in for a half of a revolution and remove it. The water valve should be energized in the last half of the revolution.
Post the results.
Here are the break down diagrams for the Roper refrigerator Model RS22AQXKQ00