HP LASERJET 300 - Manual (Page 15)

5. Remove the side cover by placing your fingers in the cover's indented area (2) and pulling, to slide
it back and remove it from the printer.
NOTE: You do not need to remove any cables from the formatter for this procedure.
Figure 1-7 MFP formatter cover - HP LaserJet 4345mfp (rear view)
ENWW Installing the fax accessory 7