Mindray A9 - Page 233

7-9
Message
Priority
Cause
Solution
Calibrate Pressure
Sensor and PEEP
Valve
Low
1. The calibration table is
not found on the EEPROM.
2. The checksum of the
calibration table does not
match.
1. Perform the pressure sensor
calibration (refer to 6.3.5).
2. If the problem persists, replace
the monitoring and controlling
assembly (refer to 11.1.11).
Calibrate O2
Sensor
Low
1. The calibration table is
not found on the EEPROM.
2. The checksum of the
calibration table does not
match.
1. Calibrate the O2 sensor (refer to
6.3.2).
2. If the problem persists, replace
the O2 sensor.
3. Calibrate the O2 sensor after the
sensor is replaced (refer to 6.3.2).
Drive Gas Pressure
Low
High
The drive gas pressure is
low.
1. Check whether gas is supplied
normally. The gas supply pressure
on the O2 pipeline should be
within the range of 280- 600kPa
(40-87PSI), and the cylinder
pressure should be within the
range of 6.9-20.0MPa
(1000-2900PSI). Check the
pressures displayed on the
pressure gauge and status screen.
2. Diagnose the safety valve by
referring to 7.6.4. If the diagnosis
fails, replace the drive gas
assembly (refer to 11.1.17).
3. If the safety valve diagnosis
succeeds, replace the drive gas
assembly (refer to 11.1.17).
O2 Supply
Failure/O2 Supply
Pressure: Failed
High O2 Supply Failure
1. Check whether gas is supplied
normally. The gas supply pressure
on the O2 pipeline should be
within the range of 280- 600kPa
(40-87PSI), and the cylinder
pressure should be within the
range of 6.9-20.0MPa
(1000-2900PSI). Check the
pressures displayed on the
pressure gauge and status screen.
2. If the pressure gauge and
electronic pressure monitoring
result indicate that the gas supply
is sufficient, replace the supply
pressure switch (refer to 11.2.1).
Power Supply
Voltage
Error/Power Board
Voltage: Failed
High
The 3.3V, 5V, or 12V
voltage is in error.
1. Select Setup > Service > Data
Monitors > Power System and
check whether the voltages in the
A/D channel fall within the range
specified in the A/D channel table.
For A8, it is normal if 24 VA is 0.
For A9, it is normal if 18 VA is 0.
2. Open the service door (refer to
8.1.1), disconnect the internal