Mindray A7 Service Manual

A7™ Service Manual 046-006272-00 5 - 5
Repair and Troubleshooting Technical Alarms Check
Flow Sensor Failure Low
Ventilator flow is out of
range.
1. Check if the zero point of the flow sensor is within
specifications.
2. Check if the measurement performed by the flow sensor is
within specifications.
3. Replace the flow sensor and perform calibration.
4. Replace the ventilator control board and perform
calibration.
Calibrate Flow Sensor
and Insp Valve
Low
1.Cal. Table isn't found in
EEPROM.
2.Checksum of Cal. Table
don't match.
Perform service calibration. Refer to section ‘‘Flow Calibration
(Service)’’ on page 4-8 .
Calibrate Pressure
Sensor and PEEP Valve
Low
1.Cal. Table isn't found in
EEPROM.
2.Checksum of Cal. Table
don't match.
Perform service calibration. Refer to section 4.3.3 Pressure
Calibration (Service).
Ventilator Initialization
Error
Ventilator Initialization:
Time out
High
After power on, the CPU
board can't send the
parameter settings to
ventilator board.
1. Restart the machine.
2. Re-plug or replace the communication cable between the
CPU Board and 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.
Power Supply Voltage
Error
High 3.3V, 5V, 12V voltage error
1. Measure the voltage at the corresponding test point.
2. If the problem persists, replace the power board.
RT Clock Needs Battery High
There is no button cell
available in the system, or
the battery is empty.
1. Replace with a new button cell on the CPU board.
2. If the problem persists, replace the CPU board.
RT Clock Failure High RT chip malfunction.
1. Restart the machine.
2. If the problem persists, replace the CPU board.
Keyboard Self Test Error
Keyboard Self Test:
Time out
High Keyboard malfunciton.
1. Check the cable connection between the keyboard and
main control board.
2. Restart the machine and perform selftest.
3. If the problem persists, replace the keyboard.
External AG Self Test
Error
External AG: Time out
Low
External AG module
selftest malfunction.
1. Re-plug the external AG module. Restart the machine and
perform selftest.
2. Check the cable connection between the module rack and
CPU board.
3. Check if the module rack works normally.
4. Replace the external AG module.
Message Priority Cause Solution

Mindray A7 Specifications

General

Type	Anesthesia Workstation
Brand	Mindray
Model	A7
Display	15-inch color touchscreen
Oxygen Flush	Yes
Gas Inlets	O2, N2O, Air
Ventilation Modes	SIMV, PSV
Breathing System	Integrated
Gas Monitoring	O2, CO2, N2O
Monitoring Parameters	FiO2
CO2 Monitoring	Mainstream or Sidestream
Power Supply	100-240 V, 50/60 Hz