Pneumatic Circuit System Problems Repair and Troubleshooting
5 - 68 046-006272-00 A7™ Service Manual
FIGURE 5-62
7. Repeat steps 3 through 7 in “4 Leak test of all pipelines on the circuit adapter”. If the test fails,
it indicates the CGO assembly is damaged. Check the seals in the CGO assembly and replace
any damaged seals.
5.3.5 Tidal Volume
The following table lists tidal volume inaccuracy related failures.
Failure
description Possible cause Recommended action
Inaccurate tidal
volume
The flow sensor is not installed properly. Re-install the flow sensor.
The setting of fresh gas flow is
inappropriate.
Adjust the fresh gas flow.
There are significant leaks in the
breathing system and the fresh gas flow
is too low.
Repair the leaking points after checking as
per the procedures described in
“Anesthetic Gas Delivery System” on
page 5-41. and “Breathing System” on
page 5-53.
* There is water build-up inside the flow
sensor.
Remove the flow sensor and clear its inside
water build-up.
*The membrane of the flow sensor
assembly is distorted, dirty or its inside
resistance changes. Zero drift occurs to
the pressure sensor on the ventilator
control board.
Enter the service mode and calibrate the
flow sensor as described in “If
measurement deviations are not corrected
after multiple flow sensor calibrations, the
user is recommended to replace the flow
sensor and then perform calibration. If the
problem persists, factory maintenance is
necessary.” on page 4-8..
*The flow sensor pressure sampling
pipeline is leaky.
Repair the leaking points after checking as
per the procedures described in “Leak Test
of Flow Sensor Pressure Sampling Pipeline”
on page 5-55..
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