Flow Meter Bezel Assembly - Dräger Medical Fabius Tiro Technical & Service Manual

Replacement Procedure
15 Flow Meter Bezel
Assembly
Dräger Medical AG & Co. KGaA
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Following is the procedure for removing and replacing the flow meter bezel
assembly. See Figure 21. This assembly comprises the fresh gas flow meter,
flow control valves, flow sensors and filter, pipeline pressure gauges, SORC,
and the fresh gas display PCB. Replacement procedures for these individual
sub-assemblies are given in subsequent paragraphs.
NOTE
If the Core Unit is wall mounted, refer to the
Procedure prior to performing the following step.
1. Disconnect all pipeline hoses and set the System Power switch to 'ON'.
2. Close all cylinder valves except the O2 valve.
3. Set the oxygen flow to 5 l/min.
4. Open the other gas flow control valves to deplete the pressure from the
system.
5. Close the O2 cylinder valve and close the flow control valves. Press the
O2 Flush valve to deplete oxygen pressure from the system.
6. Set the System Power switch to 'OFF' and disconnect AC power from the
machine.
7. Detach the cylinder supply from the yoke.
8. Disconnect the pipeline and cylinder supplies, and deplete all pressures.
9. Remove the two screws that secure the Service Access Panel at the rear
of the Core Unit.
10. Loosen the two captive screws inside the access panel securing the flow
meter bezel assembly.
11. At the front of the machine, carefully pull the assembly forward about 2.5
inches. Disconnect the ribbon cable and the O2 alarm switch wire har-
ness from the fresh gas display PCB, and disconnect each flow sensor
cable. Continue to pull the assembly forward.
The individual sub-assemblies can now be serviced as described in subse-
quent paragraphs.
12. When reinstalling the flow meter bezel assembly, push the assembly into
its compartment; reattach the ribbon cable and O2 Alarm Switch Wire
Harness to the fresh gas display PCB, and reconnect each flow sensor
cable. Continue to push the assembly into its compartment until it is fully
seated.
13. Tighten the two captive screws that secure the Flow Meter Bezel Assem-
bly.
14. Reinstall the two screws and Service Access Panel located at the back of
the machine.
15. Reconnect the pipeline and cylinder supplies and restore power to the
machine.
16. Perform the PMS procedure.
6020.002
Fabius Tiro
Wall Mount Service Access
Revision B Released
185