HP LaserJet 1320 - Manual (Page 167)

6. Carefully press the DIMM into the slot, making sure that it is straight and all the way in.
The cam latches, located at the top and bottom, should rotate inward. To snap the cam
latches into place, press the handles toward each other.
7. Close the left side panel and the print cartridge door.
8. Plug the printer back in, and turn on the power switch.
ENWW DIMMs (memory or font) 157