VIII. MAINTENANCE AND SERVICE- CONT.
60
3. From the rear of the unit, unplug the tubes from the transducers.
4. Unplug the cable from the solenoid board to the PCB.
5. Unplug the cable from the RS232 Connector board on the side of the battery compartment to the PCB. Do this at
the RS232 board and feed the cable through the pneumatic tubing until it is free to come out with the PCB.
6. From the front, unplug the potentiometer cable (JPOT) and alarm LED cable (JLED).
7. Remove the four corner screws and lock washers securing the PCB to the case and lift the PCB from the unit.
8. When re-installing, take care not to pinch any wire harnesses when lowering the PCB over the valve shafts.
9. Tighten the four PCB mounting screws.
10. Continue with the installation in reverse order of removal.
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 when they are cut or removed to facilitate reassembly.
.
1. Remove rear panel, battery, front bezel and PCB
2. Remove the two screws just under the battery compartment that hold the plate with the supply and circuit fittings.
3. If the unit has a second regulator mounted off the side of the battery compartment, remove its two retaining screws.
4. Remove the three screws from the bottom of the case. These retain the pneumatic bracket assembly.
5. Although not necessary, the RS232 connector may be removed from the side of the battery compartment to
facilitate removal of the assemblies. To remove it, remove the single retaining screw and pull it off the lower
captive stud.
6. Remove the two nuts and lock washers used to retain the solenoid manifold assembly to the side of the case and
remove the assembly from the studs.
7. The pneumatics are now free from the case and may be removed.
8. Reassemble in the reverse order.
7. PNEUMATIC VALVE BRACKET ASSEMBLY
1. Remove rear panel, battery, and front bezel. It is not necessary to remove the PCB to remove the Valve Bracket,
but may be easier if it is removed. This instruction assumes it is not removed.
2. Unplug the potentiometer from the front of the PCB (JPOT).
3. Carefully cut the ¼” tubing from the input to the Flow Valve. Do not damage the barbs on the fitting while doing
so.
4. Remove the two screws holding the 9-port exhaust manifold to the top of the relief valve manifold and separate it
from the manifold. Watch for an o-ring underneath it.
5. Prior to cutting any tubing, always make a note of its location or label it for reference when reassembling. Cut this
tubing as close to the barb as possible-
a. Yellow and clear tubes on PIP Valve (22- refer to the illustration at the beginning of the Pneumatic
Calibration section).
b. Yellow tube on D.A.R.V. Manifold (10).
c. Blue and clear tubes on the PEEP Valve (18).
6. Remove the three screws on the bottom of the Crossvent. The bracket can now be removed. Pull it straight back
while guiding the potentiometer cable under the PCB.
7. Reassemble in the reverse order. Prior to reassembling, carefully cut off the tubing remaining on any barbs, taking
care not to damage or nick the barbs. The tubing removed from the Flow Valve input will most likely need to be
replaced.
8. FLOW, PIP & PEEP VALVES
1. Remove the rear panel, battery, front bezel and PCB. In lieu of removing the PCB, the Pneumatic Valve Bracket
assembly can be removed to access the valves.
2. FLOW VALVE
WARNING: Any time the flow valve is disturbed, the flow calibration in the CAL
menu must be performed after reassembly. Refer to the Pneumatic Calibration
section.
a. From the rear of the unit, cut the tubing from the flow valve barb to the Regulator/Pilot Valve. Take care not
to damage or nick the barb.
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