Instruction manual

Instruction Manual
D200354X012
4200 Transmitters
July 2013
33
2. Remove the three screws that hold the board in place.
3. Grasp one of the components that protrudes from the board and gently lift the board from the field wiring
compartment.
4. Place the board on an anti‐static surface for repair or replacement.
Replacement:
1. When the replacement board is ready, lower the board into the transmitter compartment.
2. Insert and tighten the three screws and, install the wiring connections that were removed.
3. The red and black power wires must be connected to TB3 according to the transmitter type.
Pot/Bushing Assembly Replacement
CAUTION
Remove the wiring assembly or assemblies connected between the potentiometer and the transmitter printed wiring
board before removing the pot/bushing assembly (key 3) from the transmitter housing (key 1). Failure to disconnect the
wiring assembly(ies) may result in damage to the wiring.
1. Remove power from the instrument.
2. Remove the covers (key 2, figure 11 or 14) from the transmitter housing. Note that you will need to loosen the set
screws (key 106) before removing the covers.
3. Note the location of the field wiring, and disconnect the wiring from the field circuit printed wiring board, or from
the barrier strip (key 11, figure 14), mounted in the field wiring compartment.
4. Remove the transmitter from its mounting.
5. Perform the transmitter printed wiring board removal procedure.
6. Remove the pot/bushing assembly (key 3) from the housing (key 1).
7. When installing the pot/bushing assembly (key 3) in the transmitter housing, apply lubricant (key 50) to the
bushing threads.
8. Install the pot/bushing assembly in the transmitter housing and tighten. Ensure free rotation of the potentiometer
shaft.
9. Perform the printed wiring board replacement procedure.
10. Perform the installation, potentiometer alignment, and calibration procedures to return the transmitter to service.