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（10） Select [Maintenance] → [Factory Maintenance] → [Diagnostic Test >>] →
[Valves-Test Tool >>] to set the A/D value of the PEEP valve to make PEEP exceed
50 cmH2O. Set the A/D value of the inspiratory valve to “0” to produce 0 L/min of
flow. Set PEEP safety valve to ON, as shown below.
（11） 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.1 connector to which drive gas pipeline of the circuit
adapter test fixture corresponds, as shown below.
（12） Release the negative pressure ball. If the negative pressure ball is fully expanded
within 30 s, it indicates that the test of drive gas pipeline is failed. Check the
expiratory valve assembly and the drive gas related pipeline inside the main unit.
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