Emerson Rosemount OCX 8800 Reference Manual page 260

Maintenance and service
2.
3.
Remove Flash PROM
Complete the following steps to remove the Flash PROM from the OCX 8800.
CAUTION!
EQUIPMENT DAMAGE
Electrostatic discharge (ESD) protection is required to avoid damage to the electronic circuits.
Procedure
1.
2.
Remove LOI module and board
Complete the following steps to remove the LOI module and board from the OCX 8800.
1.
2.
3.
Remove electronics stack
Complete the following steps to remove the electronics stack from the OCX 8800.
1.
2.
3.
Remove solenoid valves
Complete the following steps to remove the solenoid valves from the OCX 8800.
1.
2.
3.
250
L. Screw
M. O-ring
N. Electronics stack
O. Flash PROM
With two hands or strap wrench, turn cover (A) counterclockwise to loosen.
Unthread and remove cover.
Inspect O-ring (M) for wear or damage. Replace O-ring if damaged.
Locate the Flash PROM access port in the electronics stack (5,
Use a suitable IC removal tool to remove the Flash PROM (6).
Remove three screws (7,
Carefully lift LOI module (8) from LOI board (9).
Note the location of LOI connector.
Remove two screws (11) and lockwashers (12). Remove LOI board (9).
Unplug power cable, signal cable, and solenoid lead connectors from terminals of
electronics stack (5, Figure
Remove two screws (13) and lockwashers (14).
Remove electronics stack (5).
Disconnect solenoid leads from mating terminal connector.
Remove top nut of solenoid valve (15 or 16,
Remove the solenoid coil assembly and washer.
Figure 9-22).
9-22).
Figure
Figure 9-22).
9-22).
OCX 8800