SMAR FI302, Operation, Maintenance & Instruction Manual

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Maintenance Procedures
4.3
Electronic Circuit
The main board (5) and output board (7) are matched pairs and must be changed together and not
mixed with others.
To remove the circuit boards (5 and 7) and display (4), first loose the cover locking (8) 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 electrostatic-proof cases.
Loosen the two screws (3) that anchors the display and the main circuit board. Gently pull out the
display, and then the main board (5). To remove the output board (7), first unscrew the two screws
(6) that anchors it to the housing (9), and gently pull out the board.
Reassemble Procedure
Put output board (7) into housing (9).
Anchor output board with its screws (6).
Put main board (5) into the housing, ensuring all inter connecting pins are connected.
Put display (4) into the housing, observing the four mounting positions. " " should point in the
direction desired as UP.
Anchor the main board and display with their screws (3).
Fit the cover (1) and lock it using the locking screw (8).
Interchangeability
Main and output boards are supposed to stay together, because calibration data from output board
circuit is stored in EEPROM of the main board. If, for some reason, you separate the boards, you
must do a calibration procedure to guarantee precision of the outputs.
Returning Materials
Should it become necessary to return the converter to SMAR, simply contact your local agent or
SMAR office, informing the defective instrument’s serial number, and return it to our factory.
In order to expedite analysis and solution of the problem, the defective item should be returned with
a description of the failure observed, with as many details as possible. Other information concerning
to the instrument operation, such as service and process conditions, is also helpful.