Product Category  Printronix (PTX)  Record ID  55
Model number  5000 series Proline
Model description  PRINTER

Topic:  5X05 should have a parameter inside configuration menu that will enable you to select either 475 lpm or 500 lpm model.  This parameter sometimes may not be selectable, and cannot be enabled or even found in the configuration menu.

Instructions  This is a slight enhancement to printer performance that was made soon after its initial release. This parameter is only available on printers with a firmware of 2.04 or higher.