HP 5550 User Guide - Page 243

Dual In-Line Memory Module (DIMM) " You may need additional memory (DIMM) for complex graphics and for duplex (Double-Sided) printing. Dual in-line memory module (or DIMM) is compact circuit board with surface-mount memory chips. The printer, which has two memory slots, has a 256 MB memory module already installed in one of the slots. By using both slots, the memory can be expanded to a maximum of 1024 MB (512 MB + 512 MB). Installing a DIMM Note It's very important to protect the printer controller board and any associated circuit boards from electrostatic damage. Before performing this procedure, review the antistatic caution on page 228. In addition, always handle circuit boards by the edges only. 1 Turn off the printer and discon- nect the power cord and interface cables. 2 Using a screwdriver, remove the screw. Then, slide the rear cover to the right and remove it. Dual In-Line Memory Module (DIMM) 229