Figure 9-7. Fuse Location - Emerson Oxymitter 4000 Instruction Manual

Oxymitter 4000
d. Electronic Assembly Replacement
(Figure 9-5)
1. Remove the right housing cover un-
covering the electronic assembly.
2. Depress and remove the J1 (cell and
T/C) connector from the J1 socket.
Loosen the three captive mounting
screws on the microprocessor board
(top board).
3. The J8 connector (heater leads) can be
accessed by moving the J1 connector
leads out of the slot on the microproc-
essor board and sliding the electronic
assembly partially out of the housing
(Figure 9-6).
4. Squeeze the J8 connector on the sides
and carefully remove. The electronic
assembly can now be completely re-
moved from the housing.
5. Reconnect the J8 connector to the
power supply board. Make sure the
connector is secure.
6. Holding the J1 connector leads, slide
the electronic assembly the rest of the
way into the housing. Align the elec-
tronic 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.
7. Reconnect the J1 connector to the mi-
croprocessor board. Ensure the con-
nector is secure and tighten the three
captive screws on the microprocessor
board (top board).
8. Replace the housing cover and ensure
it is tight.
e. Terminal Block Replacement
1. Unscrew left housing cover (27, Figure
9-3.
2. Loosen the mounting screws (26) on
the terminal block (25) and carefully lift
the block out of the housing.
3. Carefully align the new terminal block
on the pins so that it sits flat in the
Rosemount Analytical Inc. A Division of Emerson Process Management
housing. The round end of the terminal
block should be on the opposite side of
the housing conduit ports and should
not be able to rotate.
4. Tighten the three mounting screws and
ensure the terminal block is secure in
the housing.
f. Fuse Replacement (Figure 9-7)
1. Remove the right housing cover un-
covering the electronic assembly.
2. Depress and remove the J1 (cell and
T/C) connector from the J1 socket.
Loosen the three captive mounting
screws (16, Figure 9-3 or Figure 9-4)
on the microprocessor board (top
board).
3. The J8 connector (heater leads) can be
accessed by moving the J1 connector
leads out of the slot on the microproc-
essor board (17) and sliding the elec-
tronic assembly (12) partially out of the
housing (Figure 9-6).
4. Squeeze the J8 connector on the sides
and carefully remove. The electronic
assembly can now be completely re-
moved from the housing.
5. Completely remove the three mounting
screws (16) on the microprocessor
board (17).
POWER
SUPPLY
BOARD
5A
250VAC
TIME LAG
FUSE

Figure 9-7. Fuse Location

Instruction Manual
IB-106-340 Rev. 3.0
December 2003
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22220058
Maintenance and Service 9-11
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