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Pressure Systems, Inc. 98RK-1 & 9816 User’s Manual©
Page 117 www.PressureSystems.com
(4) Place the new PC-299 board in the top and bottom rack rails so that its P-2 connector
aligns with the rear panel cutout. Slide the board forward until it aligns with the top and
bottom Allen-head set screws. Install the four (4) Allen-head screws, securing the back
panels to the top and bottom rails. Re-attach the wiring harnesses to pins P3, P5, P12,
and P13 on the PC-299 board. Ensure proper Pin 1 orientation when installing the
ribbon cables. (Pin 1 of the ribbon cable has a red stripe).
(5) Ensure that all wiring harnesses are firmly connected to the PC-299 board and that the
harness from the PC-206 board is fitted through the slot under the transducer/cal-valve
housing.
(6) Test your scanner to ensure proper operation.
5.1.3.3 Valve Manifold Position Detector Circuit
All Model 9816 Intelligent Pressure Scanners are equipped with the purge/leak-charge
calibration manifold. Through software commands to each 9816, this valve may be placed in
one of four positions; RUN, CAL, PURGE, or LEAK. See Section 2.2.4 for the pneumatic input
requirements for these operating positions.
In earlier versions of the Model 9816, the manifold valve position detector was comprised of a
small printed circuit board (PC-300) mounted on the underneath side of the calibration (cal)
valve assembly. The printed circuit board (PCB) used two (2) reflective infrared sensors to
sense the actual position of the manifold valve block was connected to P12 of the PC-299
board.
Should replacement of the PC-300 be required, the scanner must be returned to the factory
where a new manifold assembly will be fitted. To replace the manifold position detector circuit:
(1) Use the tools and follow the general warnings already described in Section 5.1.1
(2) Place the scanner calibration valve in the PURGE position. Disassemble the module as
described in Section 5.1.2. When the scanner is removed from the chassis, turn it over
so that the calibration valve assembly tubing plate is facing up. The micro-switches
should both be closed (actuated by the dowel pins attached to the slide valve).
(3) Unplug the manifold position detector four-pin connector from P-12 on the PC-299 board.
Take note of the connector orientation. Remember that all PCBs are sensitive to static
discharge.
(4) Remove the four (4) mounting screws (two from each switch) that attach the micro-
switches to the manifold assembly, noting the location of each switch.
(5) Attach the new micro-switches, ensuring that the actuator arm engages the actuator
dowel pin. Adjust the dowel pin gently if it does not fully engage the switch.
(6) Return the scanner to its upright position, reassemble the scanner, replace the side
panel(s), reinstall the scanner into the rack, and test your scanner to ensure proper
operation.