Emerson Process Management OXYMITTER 4000 - Manual (Page 130)

Instruction Manual
IB-106-340C Rev. 4.1
July 2004
9-12 Maintenance and Service Rosemount Analytical Inc. A Division of Emerson Process Management
Hazardous Area Oxymitter 4000
Opening the electronic housing will
cause the loss of ALL hazardous per-
mits. Opening the electronics housing
in a hazardous area may cause an
explosion resulting in loss of property,
severe personal injury, or death. It may
be required to get a hot work permit
from your company safety officer be-
fore opening the electronic housing.
e. Fuse Replacement
See Figure 9-7.
1. Remove screw (18, Figure 9-3 or
Figure 9-4), cover lock (19), and cap-
tive washer (20) securing cover (1).
Remove the cover.
2. See Figure 9-5. Depress and remove
the J1 (cell and T/C) connector from
the J1 socket.
3. Loosen the three captive screws
(10, Figure 9-3 or Figure 9-4). Slide
electronic assembly (2) partially out of
housing (11).
4. See Figure 9-6. Squeeze the sides of
the J8 connector, and carefully remove
the J8 connector (heater leads) from
the power supply board.
5. Remove the electronic assembly (2,
Figure 9-3 or Figure 9-4) from the
housing (11).
6. Turn the electronic assembly over so
that you are looking at the bottom of
the power supply board (Figure 9-7).
7. Gently depress the two white posts one
at a time. Carefully separate the power
supply board from the analog board.
8. Remove the fuse and replace it with a
new one.
FUSE
POWER
SUPPLY
BOARD
37270021
Figure 9-7. Fuse Location
9. 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 analog board. Gently push
the boards together until the white
posts snap in place. Ensure the as-
sembly is secure by gently trying to
separate the boards.
10. Reconnect the J8 connector to the
power supply board. Make sure the
connector is secure.
11. Holding the J1 connector leads, slide
the electronic assembly the rest of
the way into the housing. Seat the
electronic assembly on the mating
connector pins.
12. Gently try to rotate the electronic
assembly to check for full seating.
If the electronic assembly rotates,
remove the assembly and repeat
step 11.
13. Reconnect the J1 connector to the
microprocessor board (Figure 9-5).
Ensure the connector is secure.
14. Tighten the three captive screws (10,
Figure 9-3 or Figure 9-4) in the top of
the microprocessor board (5).