First, ensure the power source to the PSR-1 is stable and within the specified voltage range. Check for any loose connections or damaged wiring leading to the unit. Additionally, inspect the PSR-1 itself for any signs of overheating or physical damage. If everything appears normal, consider testing with a different power source to rule out issues with the existing one. If problems persist, it may be necessary to contact Siemens technical support for further assistance or to arrange for a replacement unit.