2. Disconnect the Transmitter Electronics Enclosure security seals, loosen the end cap
security latches (3mm Allen wrench required) and remove both end caps (see
Figure 3-23).
3. Remove the CPU Module and the Optional I/O Module (if installed). See Figure 3-21
for board locations and associated terminal blocks.
4. Use a Phillips head screw driver and remove the four Backplane board screws and
captive star washers from the enclosure standoffs.
5. 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).
Figure 3-24: Backplane board replacement
A. Non-terminal end of Transmitter Electronics Enclosure
B. Power Supply board
C. I.S. Barrier board (inside the Guide Plate)
D. Acquisition cable
E. Backplane board
6. Use a 3 mm flat head screw driver and disconnect the Acquisition Cable terminal
block from the Backplane. Unplug the Acquisition Cable from the Backplane.
7. 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.
Meter repairs Maintenance and Troubleshooting manual
August 2021 P/N 3-9000-791
78 Models 3415, 3416 and 3417 GUSM
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