Error Code: 53 Error Unit 1

Printer Error - 53 Error Unit 1
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Error Message: 53 Error Unit 1

HP Error Code		53 Error Unit 1
Printers Affected		IIP, IIP+, IIIP
Description		An error was detected on the optional memory board in the indicated slot. Verify that the correct revision level and memory part # has been installed in the printer.. On the HP LaserJet IIP, IIP+, and IIIP Printers, Unit 1 and Unit 2 refer to the top and bottom slots, respectively.