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（6） Flatten the negative pressure ball to remove the gas inside. Then re-install the gas
outlet switch of the negative pressure ball properly. Connect the other end of the
negative pressure ball to No.7 (number is marked on the circuit adapter test fixture)
connector to which fresh gas pipeline of the circuit adapter test fixture corresponds, as
shown below.
（7） Release the negative pressure ball. If the negative pressure ball is fully expanded
within 30 s, it indicates that the test of fresh gas pipeline is failed. Locate the leaking
point inside the main unit as per the method described in section 5.3.3Anesthetic Gas
Delivery System.
（8） Turn on ACGO. Test the ACGO pipeline in the similar way (the connector to
which the circuit adapter test fixture corresponds is No.8 connector), as shown below.
（9） Turn on the system switch and let the systems enter Standby.
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