First Alert ACTION T-1000 - Manual (Page 77)

Installing an Interface
Before installing an interface, you must remove the printer’s cover.
WARNING:
Do not remove the cover unless the printer is
turned OFF and unplugged because high voltages are present
inside the printer when the power is on. Also, do not touch
contacts on the circuit board of the printer because many of
the components can be destroyed by the static electricity
charge that may build up on your body.
1.
2.
3.
4.
Turn off the power to both the printer and the computer and unplug
the power cable and disconnect the interface cable from the printer.
Remove the printer lid, tractor unit (if installed), paper rest (if
installed), and paper guide.
Remove the ribbon.
To remove the upper case of the printer, insert a flat-blade
screwdriver into each of the two holes at the front of the printer, as
shown in the illustration. Gently twist the screwdriver while pushing
it up until the upper case is loosened from the bottom.
Appendix A-3