Does anyone know what part number the DX2 printhead is for the Roland SC-500. I suspect it is either FJ-50 and/or for Epson model, F055090/F055110. I don't know if I can use the Epson model numbers with the Roland SC-500 printer. The service manual only states FJ-50 and I am confused as this could be a printer model and not a part number. Thanks.