This Power-SW Aj8201B is suitable for Roland XR-640 printers. This is the original Roland part (number 13129171).
 
Printer compatibility
Roland AJ-1000
Roland AJ-1000i
Roland AJ-740
Roland AJ-740i
Roland FP-740
Roland LEC-300
Roland LEC-300a
Roland LEC-330
Roland LEC-540
Roland LEJ-640
Roland SJ-1045ex
Roland XC-540
Roland XC-540mt
Roland XJ-640
Roland XJ-740
Roland XR-640
Roland SJ-1000
Roland XF-640
Roland XJ-540
Roland VG-640
Roland VG-540
Roland EJ-640
Roland XT-640