Error Code: 53-2 Error unit

Printer Error - 53-2 Error unit
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Error Message: 53-2 Error unit

HP Error Code		53-2 Error unit
Printers Affected		III, IIID
Description		An error was detected on the optional memory board in the indicated slot. Verify that the correct revision level of memory is installed in the printer.. On HP LaserJet III and HP LaserJet IIID printers, 53-1 and 53-2 refer to the front (right) and rear (left) slots, respectively.