Epson WorkForce Pro WF-R8590 DTWF - Manual (Page 21)

A Rear cover 2 (D2) Remove 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) 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.
User's Guide
Printer Basics
21