SMAR fy303, Operation, Maintenance & Instruction Manual

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Maintenance Procedures
4.3
ELECTRONIC CIRCUIT
To remove the circuit board (5) and indicator (4), first loose the cover locking (13) on the side not
marked “Field Terminals”, then unscrew the cover (1).
WARNING
The boards have CMOS components, which may be damaged by electrostatic discharges. Observe correct
procedures for handling CMOS components. It is also recommended to store the circuit boards in anti-static
proof cases.
Loosen the two screws (3) that anchor the indicator and the main circuit board. Gently pull out the
indicator, and then the main board (5).
Reassembly Procedure
TRANSDUCER
Mount the transducer to the housing turning clockwise until it stops. Then turn it counterclockwise
until it faces the square of electronic housing to the square of transducer. Tighten the hex screw (6)
to lock the housing to the transducer.
Restriction Cleaning Procedure
The air flows to the nozzle through a restriction. Verify from time to time the restriction cleaning to
assure a positioner good performance.
1. Be sure that the air supply of the equipment is blocked.
2. With an appropriate tool, remove the transducer serial number plate. (New models have the
plate placed on the opposite side of the transducer).
3. Remove the restriction screw using an adequate tool;