Mindray A7 Service Manual

Functional Tests Periodic Maintenance
3 - 16 046-006272-00 A7™ Service Manual
3.8.2 Automatic Backup Flow Control Test
This test checks whether the automatic backup flow control (BFCS) system work normally. Test
items include the Solenoid Actuator, Stepper Motor, Position Sensor, and 3-Way Valve.
To Perform an Automatic Backup Flow Control Test:
1. While powering on the A7, the system calculates the time between the last successful
Automatic Backup Flow Control Test time and current time. If the difference between the two is
greater than 168 hours, the manual circuit test screen is entered from startup and BFCS knob is
not deployed, the system enters first Automatic Backup Flow Control Test screen when manual
circuit test is completed. If the test does not appear after the manual leak test, go to SETUP /
SERVICE / TEST BFCS to activate the test.
Failure Description Possible Cause Recommended Action
Leak test failure is prompted
immediately after [Start] is
selected (typically, the leak test
requires at least 3 minutes).
The Auto/Manual ventilation
switch is set to the bag position
and the message [Manual Vent.] is
prompted.
Set the Auto/Manual ventilation
switch to the mechanical venti-
lation position.
The reading on the drive gas (O2)
pressure gauge indicates drive gas
pressure low (lower than 200 kPa)
and the alarm of [Drive Gas Pres-
sure Low] is produced.
Replace or connect gas supplies
and make sure that the drive
gas pressure is at 350 to 450
kPa.
During leak test, the pressure indi-
cated by the airway pressure
gauge fails to reach 30 cmH2O.
1. Before the leak test, the bellows
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 prop-
erly installed.
Check the connections of the
pneumatic circuit and re-install
the pneumatic circuit.
During leak test, the pressure indi-
cated by the airway pressure
gauge fails to reach 30 cmH2O.
1. Before the leak test, the bellows
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 prop-
erly installed.
Check the connections of the
pneumatic circuit and re-install
the pneumatic circuit.

Mindray A7 Specifications

General

Brand	Mindray
Model	A7
Category	Medical Equipment
Language	English