Complete Pneumatics As An Assembly - BIO-MED DEVICES CROSSVENT-3+ Operation & Service Manual

IX. MAINTENANCE AND SERVICE- cont.
8. Unplug the O jack.
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9. From the front, unplug the potentiometer cable (JPOT), alarm LED cable (JLED) and Entrainment
switch cable (JETRAIN), if present.
10. Loosen the inside nut on the power connector on the left side of the case and then remove the
external round nut.
11. Remove the four corner screws and lock washers securing the PCB to the case.
12. To remove the PCB, it should be raised at an angle by lifting the edge opposite the power connector
until the PCB clears the valve shafts and then extract it from the power side of the case. The
washer on the power jack will be loose.
13. When re-installing, be sure the inside hex nut and the washer are on the power connector before
inserting the connector through the side of the case. The washer should be outside of the nut so it
will be against the case. Taking care not to pinch any wire harnesses, angle the PCB so it is under
the O sensor jack and the power connector protrudes through its hole in the case and then lower
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the PCB over the valve shafts.
14. Check the gaskets on the power side of the case. The PCB should be underneath those that are
double thick.
15. Align the mounting holes to the case and install the four mounting screws, but do not tighten these
screws at this time.
If the round external nut for the power connector has a dimple in it, then skip to Step 17. Otherwise
continue with the next step.
16. Nut without dimple- Turn the inside nut on the power connector until it captures the lock washer
snuggly against the case.
17. Thread the round external nut onto the connector, shoulder first. With the shoulder inside the
opening for the connector, tighten this nut while holding the internal nut stationary. Be careful
during this process that the PCB remains properly aligned to the mounting holes. Go to Step 19.
18. Nut with dimple- Thread the round nut, shoulder first, onto the power connector until the face of
the nut is flush, or nearly so, with the leading edge of the connector, its shoulder is within the
opening in the case and the dimple is aligned with the small notch on the inside wall of the
connector (3:00 o'clock position as viewed from the side with the unit upright).
19. Turn the inside nut on the power connector until it captures the lock washer tightly against the case.
Be careful during this process that the PCB remains properly aligned to the mounting holes.
20. Tighten the four PCB mounting screws.
21. Continue with the installation in reverse order of removal.

6. COMPLETE PNEUMATICS AS AN ASSEMBLY

6. COMPLETE PNEUMATICS AS AN ASSEMBLY 6. COMPLETE PNEUMATICS AS AN ASSEMBLY 6. COMPLETE PNEUMATICS AS AN ASSEMBLY
Removing all of the pneumatics is usually not required for any servicing, but may be deemed necessary for
other reasons such as full case replacement. Make a note of tube routing as they are cut or removed to
facilitate reassembly.
.
1. Remove rear panel, battery, front bezel and PCB
2. Remove the two screws at the bleed exhaust screen next to the gas supply fitting. This will free the
9-port bleed manifold inside the case. Watch for the o-ring inside this manifold. Do not misplace
this if it should fall out.
3. Remove the external gas supply input fitting and remove the filter that will be exposed once this
fitting is removed. When reinstalling, align the inside hex fitting on the regulator with the opening
in the case, insert the filter (cone to the outside) and thread in the outside fitting. It is best to hold
the inside hex with a second wrench while tightening the outside fitting as these must be very tight
to seal the filter and fittings.
4. If the unit has Air Entrainment installed, then loosen the setscrews holding the knob on the
Entrainment Switch, remove the knob and remove the switch's retaining nut.
through the case.
5. On the opposite side of the case, locate the manifold (small block with relief valve) into which the
patient connector threads.
manifold. Using a 1/16" hex key, loosen this setscrew.
unscrewed. Watch for a gasket between the manifold and connector. When reassembling, do not
over-tighten this connector or the gasket will distort. Thread it in until it is seated and then turn it
another half turn and secure it with the setscrew.
6. Cut the tubing (brown) to the exhalation valve fitting on the side of the case. Do this as close to
the fitting as possible to leave as much tubing as possible. If tubing is to be reattached to this
fitting when reassembled, carefully cut off the tubing left on the barb, taking care not to damage or
From the back of the unit, there is a setscrew recessed into this
Push the switch
The patient connector may now be
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