Lexmark E320 - Printer - B/W Service Manual page 86

4500–E220/E321/E323
RAM memory error
This error indicates RAM failure. Remove DIMM(s) and re–POR the
printer. If the error persists, replace the card. If the error subsides,
check each DIMM independently. Replace faulty DIMM.
2-56
Service Manual
RAM in slot 2 is bad (962).
RAM in slot 1 is bad (961).
RAM soldered on the board is bad (960).
(963).