Emerson Fisher 4200 Instruction Manual page 31

Instruction Manual
D200354X012
5. Connect the red and black wires to the printed wiring board according to the transmitter type.
6. Perform the potentiometer alignment and calibration procedures.
Field Circuit Printed Wiring Board
Refer to figure 13 for component locations.
Figure 13. Field Circuit Printed Wiring Board
39A6195‐F / DOC
Removal:
1. Note the locations of the field wires then disconnect the wires from TB1, TB2, and TB3 (if they are all used).
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.
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.
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4200 Transmitters
March 2011
31