Using the EF-Series Unit
2-34 Rev 2/01
CAUTION
To avoid circuit damage when working with the unit, use appropriate
electrostatic discharge precautions, such as wearing a grounded wrist strap.
CAUTION
During this procedure, all power will be removed from the EF-Series unit and
any devices powered by it. Ensure that all connected input devices, output
devices, and processes remain in a safe state when power is removed from the
EF-Series unit and also when power is restored.
1.
Refer to Section 2.8.1 on page 2-28 for the Backup Procedure Before Removing Power.
2.
Disconnect the Power input connector at P8 from the Main Electronics Board.
3.
Remove the communications card by carefully pulling or prying the card loose from the lower
compression stand-offs first, the upper compression stand-off next, and finish by unplugging
the card from its mating connector. Disconnect wiring from the communications card as
needed to clear the way for removing the Main Electronics Board.
4.
Label and remove all wiring connected to the Main Electronics Board.
5.
Remove the Main Electronics Board from the five compression stand-offs securing the card,
and lift the board out of the case. You may need to carefully pry the board off the stand-offs if
you are unable to loosen the board by hand.
6.
Install the new Main Electronics Board in the case. Firmly press the board over the
compression stand-offs to secure the board to the case. The compression stand-offs “snap” into
place when the card is secured.
7.
Reconnect wiring removed in Step 4, and re-install the communications card removed in Step
3.
8.
Plug the Main Electronics Board Power wiring into socket P8.
9.
Refer to Section 2.8.3, After Installing Components.
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