Flowserve 3400IQ Digital Positioner - Manual (Page 60)

Logix 3400IQ Digital Positioner FCD LGENIM3401-00 – 06/06
60
Figure 19: Stem Position Sensor Orientation
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8.7 Main PCB Assembly
The main printed circuit board (PCB) assembly contains the circuit boards and processors that
perform control functions of the positioner. The main PCB is to be replaced as a unit. None of
the components on the main PCB are serviceable. It consists of a controller board and a Fieldbus
communication board.
Replacing Main PCB Assembly
To replace the main PCB assembly, refer to Figure 12 and 16 and proceed as outlined below. The
following tools are required:
• Phillips screwdriver
c WARNING: Observe precautions for handling electrostatically sensitive devices.
1. Make sure the valve is bypassed or in a safe condition.
2. Disconnect the power and air supply to the unit.
3. Remove the main cover.