IB-106-340
6-11
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 assem-
bly is secure by gently trying to separate the
boards.
9. Reconnect connector J8 to the power supply
board. Make sure the connector 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 electronics. If
the electronics rotates, repeat the alignment.
11. Reconnect the J1 connector to the micro-
processor board. Ensure the connector is se-
cure and tighten the three captive screws on
the microprocessor board (top board).
12. Replace the housing cover and ensure that it
is tight.
6-6.
ENTIRE PROBE REPLACEMENT (EX-
CLUDING ELECTRONICS). Do not attempt to
replace the probe until all other possibilities for poor
performance have been considered. If probe replace-
ment is needed, see Table 8-1 for part numbers.
a.
Follow the instructions in paragraph 6-4a1 to
remove the Oxymitter 4000 from the stack or duct.
If removing an Oxymitter 4000 with an integrally
mounted SPS 4000, follow the instructions in
paragraph 6-4b1.
b.
Separate the probe and the electronics housing per
paragraph 6-5a, steps 2 through 6.
c.
Reinstall electronics on the new probe per
paragraph 6-5a, steps 7 through 13.
6-7.
HEATER STRUT REPLACEMENT. This
paragraph covers heater strut replacement. Do not
attempt to replace the heater strut until all other pos-
sibilities for poor performance have been considered. If
heater strut replacement is needed, order a replace-
ment heater strut. (Table 8-1).
Use heat resistant gloves and clothing
when removing probe. Do not attempt to
work on the probe until it has cooled to
room temperature. The probe can be as
hot as 800°F (427°C). This can cause
severe burns.
NOTE
If the Oxymitter 4000 has an integrally
mounted SPS 4000, it is not necessary to re-
move the sequencer when replacing the
heater strut.
a.
Follow the instructions in paragraph 6-4a1 to
remove the Oxymitter 4000 from the stack or duct.
If removing an Oxymitter 4000/SPS 4000 assem-
bly, follow the instructions in paragraph 6-4b1.
b.
Remove entire electronics per paragraph 6-5a,
steps 2 through 6.
NOTE
If the Oxymitter 4000 is equipped with an in-
tegrally mounted SPS 4000 and installed in
corrosive conditions, stainless steel gas tubes
are used instead of silicon or Teflon tubes.
c.
Carefully remove the CAL and REF gas silicon
tubes by pulling them off the CAL and REF gas
ports. Pull the silicon tubes off the CAL and REF
gas lines.
Summary of Contents for Oxymitter 4000
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