For example, use standard LPT, EPP or ECP mode. Give them the model of the printer and which manuals you want. The program code that was downloaded to the printer is the wrong one or downloaded incorrectly or got corrupted. You must have the complete program file installation kit to download the software correctly. To turn it off you must enter the configuration on the operators panel and disable this feature.
Strong power surges such as lightning can corrupt the program file loaded on the printer.
This should be done by an Authorized Printronix Service Provider. When I try to make changes to the printers configuration the display reads locked. Put the printer in the off-line state, then press the up and down arrow at the same time. The display will flash unlocked. 14600 Myford Rd.