10. If replacing other electronics or the fuse, continue with Fuse replacement,
Backplane replacement, I.S. Barrier Board replacement or Power Supply Board
replacement and Acquisition Module replacement before replacing the end caps
and sealing the enclosure.
11. If you encounter problems replacing the electronics, see the Flow Lifecycle Services
contact information on the back cover of this manual.
This completes the CPU Module or I/O Module replacement procedure.
3.8.2 Fuse replacement
Procedure
1. Remove power to the meter.
2. Disconnect the Transmitter Electronics Enclosure security seals (see Figure 3-23),
loosen the end cap security latch (requires a 3 mm Allen wrench) on the terminal
end of the enclosure (see Figure 3-20) and remove the end cap.
3. Insert the replacement fuse (Littlefuse #218002.HXP) into the Fuse Holder.
4. Install the fuse cap into the holder and push until it is flush with the holder.
5. Turn the fuse cap clockwise 1/8 turn using a 1/4 inch standard flat head screw
driver.
6. Replace the end cap and security latch (requires a 3 mm Allen wrench).
a) If required, install the security seal wire into and (requires a 3 mm Allen
wrench).
b) If required, install the security seal wire into and through one of the two holes
in the end cap.
c) Choose holes that minimize counterclockwise rotation of the end cap when
the security wire is taut (maximum wire diameter.078 inch; 2.0mm) (see
Figure 3-23).
7. Adjust the security wire, removing all slack and thread into the lead seal.
8. Cut wire ends to remove excess wire.
9. Apply power to the meter.
This completes the fuse replacement procedure.
3.8.3
Replace Backplane, I.S. Barrier or Power Supply board
The following sections detail removal of the Backplane board, the I.S. Barrier Board and the
Power Supply Board.
Backplane replacement
Procedure
1. If replacing the Backplane board, remove power to the meter.
Maintenance and Troubleshooting manual Meter repairs
P/N 3-9000-791 August 2021
Maintenance and Troubleshooting manual 77
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