Emerson Rosemount Oxymitter 4000 Instruction Manual page 129

Instruction Manual
IM-106-340, Rev. 4.3
July 2017
Figure 9-7. Fuse Location
6. Turn the electronic assembly over so that you are looking at the bottom
of the power supply printed circuit board. Gently depress the two white
posts one at a time. Carefully separate the power supply board (20)
from the microprocessor board (17).
7. Remove fuse (19) and replace it with a new one (Figure 9-7).
8. Align the white posts with the post holes on the power supply board and
the pin connector on the power supply board with the connector port on
the back of the microprocessor board. Gently push the boards together
until the white posts snap in place. Ensure the assembly is secure by
gently trying to separate the boards.
9. Reconnect connector J8 to the power supply board. Make sure the con-
nector is secure.
10. Holding the J1 connector leads, slide the electronic assembly the rest of
the way into the housing. Align the electronic assembly so that it fits
flush on the pins. To ensure that it is flush, gently try to rotate the elec-
tronics. If the electronics rotates, repeat the alignment.
11. Reconnect the J1 connector to the microprocessor board. Ensure the
connector is secure and tighten the three captive screws on the micro-
processor board (top board).
12. Replace the housing cover and ensure that it is tight.
Entire Probe Replacement (Excluding Probe Head)
1. Do not attempt to replace the probe until all other possibilities for poor
performance have been considered. If probe replacement is needed,
see Table 10-1 for part numbers.
2. Follow the instructions in "Removal and Replacement of Probe" to
remove the Oxymitter 4000 from the stack or duct.
3. Separate the probe and the probe head per "Replace Entire Integral
Electronics (with Housing)", steps 2 through 6.
4. Reinstall the probe head on the new probe per "Replace Entire Integral
Electronics (with Housing)", steps 7 through 13.
Oxymitter 4000
9-13