DVC 6200 Not Communicating 475 Field Communicator

Dear pals,

One of my dvc 6200 postioner is not communicating with Emerson 475 field communicator (version 3.8). when I measure the voltage through hart diagnostic option i field communicator, i am getting 9V so i assume my probe is ok. normally we use this field communicator to calibrate all the control valves. Field communicator is working with all other dvc 6200 positioners. so plz help me to sort out problem.
What about the loop current?

if the valve is connected to the loop, just try to open it from the DCS (50% for example) and the connect the HART com.
or you can use a current generator directly.