This Main board assy is suitable for Mutoh Drafstation printers. This is the original Mutoh part (number DG-43734 replacing part DF-49714). Mutoh have re-designed and unified the Drafstation RJ-900 main board to include memory on-board instead of using a memory slot. This board is compatible with all Drafstation RJ-900 series printers excepted RJ-900X, and can replace old-style boards with or without a memory expansion. RJ-900X printers, use PBOMU83234.