HP Business Inkjet 2600 Printer series - Manual (Page 38)

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4 Remove the HP PCL 5C/PS3 Card from the back of the printer by
loosening the two thumbscrews.
5 Remove the DIMM from the antistatic package, and then align the
DIMM with the DIMM slot on the HP PCL 5C/PS3 Card.
6 Insert the DIMM at an angle into the slot (1) and press it down until
it snaps into the slot (2). (To remove a DIMM, the locks on the
DIMM slot must be released by pushing them outwards.)
7 Replace the card and fasten the thumbscrews.
8 Reattach any cables and the power cord, and then turn on the
printer.