User's Guide Printer Basics 19 A Rear cover 2 (D2) Pull out when removing jammed paper. B AC inlet Connects the power cord. C Rear cover 1 (D1) Open when replacing the maintenance box or maintenance rollers, or removing jammed paper. D Rear cover (E) Covers for the optional paper cassette units. Open when replacing the maintenance rollers or removing jammed paper. E Service USB port USB port for future use. Do not remove the sticker. F LINE port Connects a phone line. G EXT. port Connects external phone devices. H LAN port Connects a LAN cable. I USB port Connects a USB cable.