The Alio goniometer has a problem with one of the stages. The Y-axis is the affected axis which provides the raster centering at phi=0. - For automated operation, we do not recommend, and have never recommended, using the 5um or 10um aperture. - For automated operation, we suggest collecting a sweep from -90 to 90 to reduce the possibility of the sample rotating out of the beam. - For manual operation, we suggest taking test shots every 45 deg from phi=-90 to 180 to ensure the crystal will stay in the beam and then collecting an appropriate sweep. - Crystals less than 10um may be problematic, as may thin plates, however, we do recommend trying them anyway to see how they behave. - Symptoms of problems would be observing significant under- or overshoot of the expected position during centering, particularly at phi=0 or chronic rotation out of the beam during automated collection. - If significant problems occur, the staff can be asked to clean the stages which will usually, temporarily, improve their motion. - Repair of the stages is planned during the January 2017 shutdown.