Mindray WATO EX-55, Service Manual

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3.7.2.2 Commonly-encountered Problems and Recommended Actions
The following table lists the commonly-encountered problems and recommends actions for
breathing system leak test in mechanical ventilation mode.
Failure description Possible cause Recommended action
The bag/mechanical ventilation
switch is set to the bag position
and the message [
Manual Vent.
]
is prompted.
Set the bag/mechanical
ventilation switch to the
mechanical ventilation position. Leak test failure is
prompted immediately
after [
Start
] is selected
(typically, the leak test
requires at least 3
minutes).
The reading on the drive gas
(O2) pressure gauge indicates
drive gas pressure low (lower
than 200 kPa) and the alarm of
[
Drive Gas Pressure Low
] is
produced.
Replace or connect gas supplies
and make sure that the drive gas
pressure is at 350 to 450 kPa.
When the system works
normally, the machine is
not leaky and the bellows
folding bag does not
collapse but leak test is
always failed. Fresh gas is not provided when
leak test is performed. Make sure that fresh gas is
provided.
During leak test, the
pressure indicated by the
airway pressure gauge
fails to reach 30 cmH2O. 1. Before the leak test, the
bellows folding bag is not fully
inflated.
2. The Y piece on the breathing
tube is not connected to the test
plug.
3. The bellows housing is not
properly installed. Check the connections of the
pneumatic circuit and re-install
the pneumatic circuit.
During leak test, the
pressure indicated by the
airway pressure gauge
reaches 30 cmH2O but
then falls rapidly. 1. The bellows housing may not
be installed properly.
2. The expiratory valve assembly
is leaky.
3. The circuit is not tightly
connected to the circuit adapter.
4. The connection between the
sampling line of the sensor and
the board is leaky. Check the connections of the
pneumatic circuit and re-install
the pneumatic circuit.