Samsung CLP 550 - Manual (Page 260)

I NSTALLING P RINTER O PTIONS F.2
Installing Printer Memory
Your printer has the dual in-line memory module (DIMM) slot.
Use this DIMM slot to install more memory for the printer.
Note: Your printer has 64 MB (128 MB for the CLP-550N) of
memory which can be expanded to 320 MB (384 MB for the
CLP-550N). Use only a Samsung-approved DIMM, part number
ML-00MC (64 MB), ML-00MD (128 MB), or ML-00ME (256 MB).
Contact your Samsung dealer.
C AUTION : Static electricity can damage DIMMs. When handling a
DIMM, either wear an antistatic wrist strap, or frequently touch the
surface of the DIMM antistatic package and then touch bare metal
on the printer.
1 Turn the printer off and unplug all cables from the printer.
2 To remove the control board cover, press down on the tabs
at the top and take it off.