A7™ Service Manual 046-006272-00 5 - 39
Repair and Troubleshooting Pneumatic Circuit System Problems
FIGURE 5-27
5. Turn on the O2 pipeline supply.
6. Turn on the machine to enter Standby.
7. Turn off all flow regulators.
8. Turn off the pipeline gas supply (if the reading on the test pressure gauge begins to fall
dramatically and continuously after the gas supply is turned off, it indicates that there are one or
more leaks in the O2 supply inlet assembly, expiratory valve assembly, O2 flush button assembly,
system switch assembly, and/or the O2 flow regulator. Perform the subsequent operations after
the leaks are serviced. Failures can be located by using the methods described in ‘‘Anesthetic
Gas Delivery System’’ on page 5-41. and ‘‘Breathing System’’ on page 5-53.Breathing System
except O2 supply inlet assembly related failures).
9. Manually adjust the O2 flow regulator until O2 flow is approximately 1 L/min, causing the
reading on the test pressure gauge to fall gradually to 0.25 MPa (36 psi).
10. Turn off O2 flow to cause the reading on the test pressure gauge not to fall. If the “O2 Supply
Failure” alarm occurs 10 seconds later, it indicates that the pressure switch of the O2 supply inlet
assembly is defective. Troubleshoot this problem as described in the relevant failure table.
11. Adjust the O2 flow regulator until O2 flow is approximately 0.5 L/min, causing the reading on
the test pressure gauge to fall gradually to 0.2 MPa (29 psi).
12. Turn off O2 flow to cause the reading on the test pressure gauge not to fall. If the “Drive Gas
Pressure Low” alarm occurs 10 seconds later, it indicates that the pressure switch on the
integrated pneumatic circuit of the expiratory valve assembly is defective. Troubleshoot this
problem as described in the relevant failure table.
13. Adjust the O2 flow regulator until O2 flow is approximately 0.3 L/min, causing the reading on
the test pressure gauge to fall gradually to 0.15 MPa (21.7 psi).
14. Turn off O2 flow to cause the reading on the test pressure gauge not to fall. If the “O2 Supply
Failure” alarm does not occur 10 seconds later, it indicates that the pressure switch of the O2
supply inlet assembly is defective. Troubleshoot this problem as described in the relevant failure
table.
15. Adjust the O2 flow regulator until O2 flow is approximately 0.3 L/min, causing the reading on
the test pressure gauge to fall gradually to 0.05 MPa (7 psi).
16. Turn off O2 flow to cause the reading on the test pressure gauge not to fall. If the “Drive Gas
Pressure Low” alarm does not occur 10 seconds later, it indicates that the pressure switch on the
integrated pneumatic circuit of the expiratory valve assembly is defective. Troubleshoot this
problem as described in the relevant failure table.
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