Infinia rotation motion will move for about 1 degree then stop, only occurs when starting from the 0, 90, 180,…

Infinia rotation motion will move for about 1 degree then stop, only occurs when starting from the 0, 90, 180, or 270 degree position Infinia rotation motion will move for about 1 degree then stop Motion will continue if you repeatedly attempt the motion with the RCU. Problem only occurs when starting from the 0, 90, 180, or 270 degree position. No errors are observed. NOTE: Gantry RCU rotation step in System Configuration/Admin/System Preferences is set to 90 degrees. The rotation maybe sliping back a small amount after motion stops at 90 or 270, especially in L-mode. Then, when the operator uses RCU to move from 90 or 270, rotation only moves to 90 or 270 and stops again. The amount that it slips back is typically small enough that the GDU does not show a change in rotation (i.e., less than 0.5 degrees). However, it is enough that the system configured to stop at 0, 90, 180, 270 sees that it was not at one of these angles and, therefore, stops again.