Sensors and Valves Problems Repair and Troubleshooting
5 - 72 046-006272-00 A7™ Service Manual
FIGURE 5-66
5.4.3 Preparations before Using Diagnostic Tests
Make the following preparations before using the valves-test tool to locate the valves or sensors
related failures:
1. Connect the pneumatic circuit according to the type of sensor or valve to be checked.
Before using the Diagnostic Tests Menu: connect the tubes of the anesthesia machine following
the constant-flow connection method to check the flow sensors and inspiratory valve. For
details, refer to ‘‘Flow Calibration (Service)’’ on page 4-8.
2. Make sure that the supply gas pressure is within specifications.
3. When the system is in Standby, select the [Setup] shortcut key > [Service] > [Diagnostic Tests] to
access the [Diagnostic Tests] menu.
5.4.4 Zero Points of Flow & Pressure Sensors Problems
By using the [Diagnostic Tests], you can easily detect if the zero points of all the pressure and flow
sensors are within specifications.
To diagnose the zero points of the sensors:
1. Disconnect all gas supplies and make sure that the actual values of the sensors are “0”.
2. Check the A/D counts of the sensors in the valve-test tool menu, which are the zero points of
the sensors.
3. If the zero point of one sensor is outside of specifications, it indicates that the ventilator control
board is defective. You need to replace the board.
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