Mindray A7

A7™ Service Manual 046-006272-00 5 - 17
Repair and Troubleshooting Technical Alarms Check
Pinsp Not Achieved Low
In pressure mode,
Pinsp is less than 2/3
of its setting value
(setting value is
greater than 9cmH2O)
or less than setting
value-3cmH2O
(setting value is less
than 9cmH2O) for 6
cycles continuously.
1. Check for breathing circuit leakage.
2. Check the measurement accuracy of the pressure sensor.
3. Perform calibration in case of measurement failure.
4. Replace the ventilator control board and perform calibration.
Vt Not Achieved Low
TVi is less than TV
setting value for 6
cycles continuously
for over 20% or 50ml,
whichever is greater.
1. Check for breathing circuit leak.
2. Check the measurement accuracy of the pressure sensor.
3. Perform calibration in case of measurement failure.
Patient Circuit Leak Med
1. Pressure less than
2cmH2O for 30s
continuously during
mechanical
ventilation.
2. Patient not
connected.
1. Check the breathing circuit connections and flow sensor
connections.
2. Check the tidal volume measurement accuracy of the sensor.
3. Check for breathing system leakage.
CO2 A bsorber
Canister Not Locked
High
CO2 Ca nister Not
Mounted
1. Re-mount the CO2 absorber canister.
2. Check the cable connected between the CO2 absorber canister and
the ventilator control board. Replace the cable if necessary.
3. If the problem persists, replace the ventilator control board.
4. If the problem persists, replace the switch on the CO2 abso rber
canister.
Ventilator Comm
Stop
High
Lost communication
with CPU board for
10 seconds.
1. Restart the machine.
2. Re-plug or replace the communication cable between the CPU
board and the ventilator control board.
3. If the problem persists, replace the ventilator control board.
4. If the problem persists, replace the CPU board.
Drive Gas Pressure
Low
High
Drive Gas Pressure
Low
1. Check the status of actual gas supply to confirm if the alarm is in
compliance with the actual status.
2. Short circuit the pressure switch and the alarm regarding outputted
signals should disappear. Otherwise, it indicates that the pressure
switch is defective. Replace the pressure switch. Otherwise, check the
connection between the pressure switch and the ventilator control
board and check the socket.
3. If the above two items are within specifications, replace the
ventilator control board.
O2 Supply Failure High O2 Supply Failure
Use the same method to drive gas pressure low to check the O2
pressure switch. If this message occurs when using tanks as the gas
supply source, check that the O2 regulator is within specifications and
calibrate it as required.
3-way Valve Failure Low
Error of Solenoid
valve electrical signal
control status
1. Check the Solenoid valve connection line.
2. Replace the Solenoid valve assembly.
3. Replace the ventilator control board.
Auto Ventilation
Disabled
Low
System self test
failure. Manual Only.
1. Restart the machine.
2. If the problem persists, check the relevant module based on the
system selftest result.
3. If the problem persists, replace the relevant module based on the
system selftest result.
Auto Ventilation
Disabled - Leak Test
Failed
Low
Automatic circuit
le
ak test failure
1. Check if the circuit and tubes are correctly installed (if the sampling
port is occluded and if the drain valve is occluded)
2. Do leak test again.
Message Priority Cause Solution