Mindray A7 Service Manual

Technical Alarms Check Repair and Troubleshooting
5 - 10 046-006272-00 A7™ Service Manual
5.2.4 Runtime Alarms of Flow Sensor Board
Message Priority Cause Solution
Electronic Flow Control
Error
Med
1. CPU DVCC, CPU DVDD, CPU
AVDD or FPGA VPP , FPGA DVCC,
FPGA 1.2V, FPGA 3.3V, AVCC,
voltage error.
2. 3-way valve error.
3. The O2, N2O, or air flow sensor
is faulty.
4. The O2/balance gas flow is not
detected. Or the O2/balance gas
temperature is too high.
5. FPGA error.
See “EFCS Failure Alarm Numbering Conventions”
on page 5-12.
NO Fresh Gas Med
Fresh gas is turned off in manual
or mechanical ventilation mode.
1. Check whether gas is supplied normally.
2. Turn on the fresh gas and set it to a proper value.
O2 Branch Flow Not
Achieved
Low
The O2 flow exceeds the preset
value by 10% or 0.2 L/min. The
greater value prevails.
1. Check whether gas is supplied normally.
2. Check whether the flow sensor complies with
the specifications.
3. Replace the flow sensor when necessary.
Balance Gas Branch Flow
Not Achieved
Low
The balance gas flow exceeds the
preset value by 10% or 0.2 L/min.
The greater value prevails.
1. Check whether gas is supplied normally.
2. Check whether the flow sensor complies with
the specifications.
3. Replace the flow sensor when necessary.
Backup Flow Control
Deployment Failure
High
The solenoid actuator
malfunctions.
1. Restart the machine.
2. Replace components of the backup flow control
system.
Backup Flow Control
Retraction Failure
Med The stepper motor malfunctions.
1. Restart the machine.
2. Replace components of the backup flow control
system.
Air Supply Failure Med Air supply failure.
1. Check whether gas is supplied normally.
2. Short-circuit the pressure switch and the alarm
should disappear. Otherwise, it indicates that the
pressure switch is defective. Replace the pressure
switch. If the pressure switch is not defective,
check the connection between the pressure
switch and the flow sensor board.
3. If the problem persists, replace the flow sensor
board.
N2O Supply Failure Med N2O supply failure.
Use the same method as that of Air Supply Failure
to check the N2O pressure switch.
Backup Flow Control Valves
Open
Med
The BFCS needle valve is not fully
turned off when EFCS is used.
1. Alarm mechanism: the needle valve contact
switch detects signals and pass them to the EFCS
VCM, which reads high/low level to judge the
status of needle valve etc.
2. Check if the needle valve knobs of all limbs of
the BFCS are already fully closed. If yes, it is
considered that the position switch where the
needle valve is located or the 0632 EFCS VCM
board PCBA is faulty. Replace the position switch
or board and return the position switch or board to
R&D.
Backup Flow Control
Enabled
Low
If the machine functions properly,
the backup flow control system is
enabled manually.
If the flow sensor malfunctions,
the backup flow control system is
enabled automatically.
1. Retract BFCS manually on the main interface.
2. Access the service menu and retract BFCS.
3. Restart the machine.
4. Replace the flow sensor board.

Mindray A7 Specifications

General

Brand	Mindray
Model	A7
Category	Medical Equipment
Language	English