Ensure the IR safety area is clear and the sensors are clean. Incorrect wiring
Beware of low-quality scans on generic document-sharing sites. These often have missing pages, illegible wiring diagrams, or are for the wrong sub-model (e.g., the 7228-90 instead of the 7228-95). Here is your sourcing strategy for extra quality:
The back gauge rides on a precision spindle and linear guides.