Siemens circuit board model S34-PC3 - Trigger B-S34 - Assy 9410531 S015U Rev. D - Schem 9410549 S015U Rev. D. Used. Presumed good, however unable to test. This item was removed from a head/MLC (Multi-leaf Collimator) testing machine; please examine photos carefully to determine if it is the correct version for your equipment.