A5/A3™ Service Manual 046-001141-00 5 - 65
Repair and Troubleshooting Pneumatic Circuit System Problems
In the above table, possible causes marked “*” are related to inaccurate measured values by flow
sensors. Do the following to detect if tidal volume inaccuracy results from “*” marked causes.
1. Turn off the flow regulators.
2. Make sure that the patient is disconnected from the system and that the Auto/Manual
ventilation switch is set to the mechanical ventilation position.
3. Remove the bellows and then install the bellows housing properly.
4. Remove the water collection cup.
5. Connect the inspiration and expiration connectors together by using a breathing tube, as
shown below.
FIGURE 5-69
6. Turn on gas supplies and enter Standby.
7. Select [Setup] > [Service] > [Diagnostic Tests] > [Valves] to set the A/D value of the PEEP valve to
make PEEP exceed 40 cmH2O. Set PEEP safety valve to ON, as shown below.
*The flow sensor is damaged. Replace the flow sensor.
*The pressure sensor on the ventilator
control board is defective.
Replace the ventilator control board.
The inlet gas flow regulator on the
integrated pneumatic circuit of the
expiratory valve assembly is defective.
Replace the integrated pneumatic circuit
of the expiratory valve assembly or replace
the expiratory valve assembly.
The current Plimit is set too low, which
causes expiration to start in advance.
Set Plimit to a higher value to cause Paw
not to exceed the limit.
The displayed TVe and TVi are not the
same.
In the valves test tool, compare the
measurement error made by three sensors
and judge whether to perform calibration
as per 4.3.2 Flow Calibration (Service).
Failure
description Possible cause Recommended action
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