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PRESYS
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Instruments
4.0 - Maintenance
4.1 - Controller Hardware
The Controller maintenance requires the user to have access to the hardware
of the instrument. The Controller hardware consists of three main boards: Display
Board, CPU Board and Power Supply Board. The three -board system is fixed to the
aluminum case by a screw on the lower part of the front-panel. Loosen this screw
and pull the Controller front-panel in order to remove the instrument from the case.
The Display Board is located on the Controller front panel. The front panel is
provided with four internal retaining brackets located on the four corners which keep
the CPU Board and the Power Supply Board attached together. A spacer is screwed
between the CPU Board and the Power Supply Board to confer the set a greater
rigidity. To open the set follow the instructions below:
i) Remove the screw attaching the spacer located on the rear part of the circuit
boards.
ii) Turn the Controllers so that its display will be positioned opposite to reading
direction.
iii) Just loosen the retaining bracket located on the RH upper corner of the front
panel.
iv) Disengage the upper circuit board toward the right and open the circuit boards as
shown on figure 30.
Power Supply Board
DCY - 2057 Pressure Controller
Fig. 30 - Controller Hardware
CPU Board
Holder
Display board
Maintenance
Page 50
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