This Main board assy is suitable for Mutoh RJ-900X Drafstation printers. This is the original Mutoh part (number DH-40432 replacing part DG-43734 and DF-49714). Mutoh have re-designed and unified the Drafstation RJ-900X main board to include memory on-board instead of using a memory slot.
 
Printer compatibility
Mutoh RJ-900X-U1
Mutoh RJ-900X (Drafstation)
Mutoh RJ-900XG (Drafstation)