Figure 3-19 Backplane Board Replacement - Emerson Daniel 3818 Maintenance And Troubleshooting Manual

Maintenance and Troubleshooting Manual
3-9000-772 Rev B
6.

Figure 3-19 Backplane board replacement

A.
B.
C.
D.
A. Non-terminal end of Transmitter Electronics Enclosure
B. Power Supply board
C. I.S. Barrier board (inside the Guide Plate)
D. Backplane board
7.
8.
9.
10.
11.
12.
13.
Make sure the terminal blocks are aligned with the Guide Plate openings.
14.
15.
Replacing the Backplane
Pull the Backplane board out of the enclosure. This disconnects the I.S. Barrier Board.
Lay the Backplane board down with the Acquisition Cable still attached (the Power
Supply board may remain attached to the Backplane when you remove it from the
enclosure).
Use a 1/8 inch (3 mm) flat head screw driver and disconnect the Acquisition Cable
terminal block from the Backplane. Unplug the Acquisition Cable from the Backplane.
Remove the Power Supply (if it was not removed with the Backplane board) and I.S.
Barrier boards from the enclosure. The I.S. Barrier Board has a notched tab that secures
the board to the Guide Plate.
Attach the Acquisition Cable terminal block to the new Backplane Board and plug the
Power Supply Board and I.S. Barrier board into the Backplane board.
Insert the Backplane (with the Power Supply and I.S. Barrier Boards attached to the
Backplane) into the enclosure.
Fully seat the CPU Module onto the Backplane board.
Install the four Phillips head screws to secure the Backplane to the enclosure standoffs.
Reinstall the terminal blocks on the CPU Module and the Power Supply board using a
3 mm flat head screw driver.
Recheck the connections, wiring and switch settings before replacing the end caps.
If replacing other electronics, continue with the following sections before replacing the
end caps and sealing the enclosure.
Section 3: Meter maintenance
January 2018
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