A5/A3™ Service Manual 046-001141-00 5 - 27
Repair and Troubleshooting Pneumatic Circuit System Problems
5.3.2.1 Test the Pipeline Pressure Gauge and Correct the Regulator
Use the following tools to test the pipeline pressure gauge and regulator of the pipeline gas supply
inlet assembly:
• 1 MPa (10bar) test pressure gauge (before the test, make sure that the 1 MPa (10bar) test pressure
gauge is in good condition) (quantity: 1)
• 3106-04-06 adapter connector (quantity: 1)
• PU tube (4X200) (quantity: 1)
• PU tube (6X200) (quantity: 1)
Test procedures:
I O2 supply inlet assembly:
1. Turn off the pipeline gas supply and bleed the residual pressure through O2 flushing.
2. Disconnect tube 57. The end of the tube which connects the auxiliary O2 supply is not pulled
out but the end to Y piece is pulled out.Connect 1MPa test pressure gauge to the above Y piece
through “3106-04-06 adapter connector”.
The readings on the
pipeline pressure gauge
fluctuate greatly.
The filter of pipeline gas
supply inlet assembly or
the PU tube of the pipeline
pressure gauge is
occluded or the pressure
gauge is damaged.
1. After confirming that the pipeline gas pressure is
stable, check the PU tube of the pipeline pressure
gauge and filter of the pipeline gas supply inlet
assembly. If the tube or the filer is occluded,
replace it.
2. If the problem persists, replace the pipeline
pressure gauge.
No “O2 Supply Failure”
alarm occurs when the
O2 pressure is low or
this alarm occurs when
the O2 supply pressure
is within specifications.
The gas pressure switch of
the O2 supply inlet
assembly is ineffective.
Adjust the pressure switch of the O2 supply inlet
assembly to cause O2 supply pressure to approach
0.2 MPa as much as possible within the range of
0.15 to 0.25 MPa when this alarm occurs. If the
adjustment fails, replace the pressure switch (refer
to “Adjust the Pressure Switch” on page 5-34.).
No “Drive Gas Pressure
Low” alarm occurs when
the drive gas pressure is
low or this alarm occurs
when the drive gas
pressure is within
specifications.
The pressure switch on the
integrated pneumatic
circuit of the expiratory
valve assembly or the PEEP
safety valve is ineffective.
Or, the filter on the
integrated pneumatic
circuit of the expiratory
valve assembly is
occluded.
Adjust the pressure switch on the integrated
pneumatic circuit of the expiratory valve assembly
to cause drive gas pressure to approach 0.14 MPa
as much as possible within the range of 0.05 to 0.2
MPa when this alarm occurs. If the adjustment fails,
replace the pressure switch. If the problem persists
after the pressure switch is replaced, replace the
integrated pneumatic circuit of the expiratory
valve assembly (refer to ‘‘Adjust the Pressure
Switch’’ on page 5-34)
Failure description Possible cause Recommended action
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