7. Remove the four mounting screws that secure the mounting plate to the rear of the NEMA 4X enclosure. See
illustration D-2.
8. Lift the electronic assembly and mounting plate out of the enclosure and place on a clean working surface or
bench.
9. Separate the electronic assembly from the mounting plate by removing the 4 mounting screws (and lock wash-
ers) from the rear of the mounting plate. Be careful not to damage the rubber heater secured to the rear of the
mounting plate. It is not necessary to remove the ground cable from the mounting plate.
10. The EPROMs are the two labeled integrated circuits installed in the latching sockets on the rear of the electron-
ics assembly. Remove one EPROM at a time by releasing the latching mechanism on the socket. The latching
mechanism is released by carefully pushing the latching levers away from the body of the EPROM into the hor-
izontal position. The levers will lift the EPROM from the socket.
11. Install the new EPROMs into the sockets. Note that each EPROM is numbered (-1 or -0) and must be installed in
the respective socket and oriented properly. The small indentation on the end of each EPROM must be orient-
ed as shown in illustration D-4.
12. Visually inspect the newly installed EPROMs to insure all 28 pins are properly seated in the sockets and that the
orientation is correct. Compare to illustration D-4.
13. Reinstall the electronic assembly and mounting plate into the NEMA 4X enclosure. The installation is performed
in the reverse order of the removal. Retighten all removed screws. Ensure that all cables and customer wiring are
properly installed.
14. Reconnect AC power and check for proper monitor operation.
96
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