Error Code: 18 Aux I/O Nt Rdy

Printer Error - 18 Aux I/O Nt Rdy
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Error Message: 18 Aux I/O Nt Rdy

HP Error Code		18 Aux I/O Nt Rdy
Printers Affected		4, 4M
Description		The modular I/O (MIO) card is not ready. Refer to the MIO card's documentation. The printer will continue to display this message until the problem with the card is corrected or the card is removed. Always turn off and unplug the printer when removing I/0 cards. Pressing Continue will not clear the display.