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Instruction Manual
IB-106-5081, Rev. 1.0
May 2005
Rosemount Analytical Inc. A Division of Emerson Process Management Maintenance and Service 5-1
Model 5081FG
SECTION 5
MAINTENANCE AND SERVICE
Install all protective equipment covers
and safety ground leads after equip-
ment repair or service. Failure to in-
stall covers and ground leads could
result in serious injury or death.
Disconnect and lock out power before
working on any electrical components.
5-1 MODEL 5081 ELECTRONICS
REPLACEMENT
Before replacing any electronic components,
verify that the power to the Model 5081 Trans-
mitter is removed. Refer to Table 8-1 for re-
placement part numbers.
a. Display Board Replacement
Use the following procedure to replace dis-
play board (12, Figure 5-1).
1. Loosen screw (15) until cover lock (16)
disengages from the knurled surface of
circuit end cap (14).
2. Remove circuit end cap (14).
3. Remove three screws (13) retaining
the electronics in place.
4. Lift display board (12) and disconnect
the ribbon cable connector between
the display board and the CPU board
(11).
5. Using a replacement display board,
connect the ribbon cable connector
between the display board and the
CPU board (11). Ensure the cable
connector is fully seated.
6. Reposition display board (12) on the
standoffs. Rotate the display board 90
degrees either way as desired.
7. Install and tighten all three screws (13).
8. Install circuit end cap (14).
9. Tighten cover lock screw (15) until
cover lock (16) engages knurled sur-
face of circuit end cap (14).
b. Spare Board Stack Replacement
The spare board stack is composed of the
analog board (10, Figure 5-1) and the CPU
board (11). Use the following procedure to
replace either of these boards.
1. Loosen cover lock screw (15) until
cover lock (16) disengages from the
knurled surface of circuit end cap (14).
2. Remove circuit end cap (14). Remove
three screws (13).
3. Lift display board (12) and disconnect
the ribbon cable connector between
display board and CPU board (11).
4. Remove two screws (4) and lockwash-
ers (3). Lift terminal block (6) until the
analog board (10) is unplugged from
the terminal board.
5. Lift spare board stack from housing (1)
by the standoffs. Reinstall terminal
block (6), lockwashers (3), and screws
(4).
6. Remove standoffs from the spare
board stack. Replace faulty analog
board (10) or CPU board (11). Reinstall
standoffs.
7. Install repaired spare board stack into
housing (1). Carefully seat the analog
board onto housing pins. Press firmly
on the CPU board standoffs to ensure
good contact.
5