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5.  Unplug the airway pressure sampling line from the airway pressure sampling connector 
(high pressure) on the monitor board. 
6.  Connect the third connector (Connector C) of the four-way device to the airway pressure 
sampling connector (high pressure). 
7.  Connect the fourth connector (Connector D) of the four-way device to pressure 
sampling connector (high pressure) of the calibration device. 
 
NOTE 
z  The sampling lines going through the four-way device must be connected to the 
high pressure ends of the pressure sampling connectors of the pressure sensors.   
z  It is recommended to connect the sampling lines for pressure calibration to the 
four-way device following the procedurs to avoid errors. 
8.  Make sure that the anesthesia machine is in standby mode. 
9. Select the [Maintenance] shortcut key → [Factory Maintenance >>] → enter the 
required password → [Factory Cal. >>] → [Pressure Cal. >>] → [Start]. 
10.  After pressure calibration success is prompted, refer to 4.2.6Check the Pressure Sensor 
Accuracy to test the effectiveness of pressure calibration. In case of calibration failure, 
first fix the problem and then perform pressure calibration again. 
NOTE 
z  After pressure calibration, test the accuracy of pressure sensors by referring to 
4.2.6Check the Pressure Sensor Accuracy. 
z  In case of calibration failure, first fix the problem and then perform pressure 
calibration again. 
 
4.3.3.2 Commonly-encountered Problems and Recommended Actions 
 
Failure description  Possible cause  Recommended action 
[Drive Gas Pressure Low] is 
alarmed. The pressure 
indicated by the drive gas 
(O2) pressure gauge is lower 
than 200 kPa. 
Replace or connect the gas 
supplies to make sure that drive 
gas pressure is between 350 and 
450 kPa. 
After [Start] is selected, no 
ventilation sound is heard. 
Very soon, the prompt 
message of [Calibration 
Failure! Please try again.] is 
displayed. 
Zero point error occurs to the 
airway pressure gauge or 
PEEP pressure sensor. Refer 
to  4.2.4Check the Sensor 
Zero Point. 
Replace the monitor board.