Mindray A7 Service Manual
Service Manual
™
Anesthesia System
Service Manual
™
Anesthesia System
A7™ is U.S. trademarks of Mindray DS USA, Inc.
Selectatec® is a registered trademark of Ohmeda.
Copyright © Mindray DS USA, Inc., 2014 to 2016. All rights reserved. Contents of this publication may not be reproduced in
any form without permission of Mindray DS USA, Inc.
046-006272-00 A7™ Service Manual
Table of Contents
Table of Contents
Foreword ...............................................................................................................................................................................................................................vii
Warnings, Cautions, and Notes.....................................................................................................................................................................................vii
Warnings................................................................................................................................................................................................................................vii
Cautions................................................................................................................................................................................................................................viii
Notes........................................................................................................................................................................................................................................ix
Theory of Operation ............................................................................................................................................ 1 - 1
Introduction..........................................................................................................................................................................................1 - 2
Electrical and Pneumatic Connections .......................................................................................................................................1 - 4
Electrical Connections .......................................................................................................................................................................................1 - 4
Pneumatic Connections (A7)...........................................................................................................................................................................1 - 7
Connections Between Pneumatic Circuit, Breathing System and Ventilator Control Board................................................1 - 10
Gas Flow .............................................................................................................................................................................................. 1 - 12
Pneumatic Circuit Diagram...........................................................................................................................................................................1 - 12
Parts List...............................................................................................................................................................................................................1 - 13
Key to Symbols.................................................................................................................................................................................................. 1 - 14
Description.......................................................................................................................................................................................................... 1 - 14
Anesthesia System Components ............................................................................................................................................... 1 - 42
Auxiliary Outlets................................................................................................................................................................................................ 1 - 42
Work Light Board.............................................................................................................................................................................................. 1 - 42
The Breathing System .................................................................................................................................................................... 1 - 44
Brief Introduction ............................................................................................................................................................................................. 1 - 44
Automatic Mode, Inspiration .......................................................................................................................................................................1 - 44
Automatic Mode, Expiration ........................................................................................................................................................................ 1 - 45
Manual Mode, Inspiration .............................................................................................................................................................................1 - 45
Manual Mode, Expiration............................................................................................................................................................................... 1 - 46
Pneumatic PEEP ................................................................................................................................................................................................1 - 47
Ventilator in Standby ...................................................................................................................................................................................... 1 - 47
Breathing System Components.................................................................................................................................................................. 1 - 47
Ventilator UI ....................................................................................................................................................................................... 1 - 49
Display..................................................................................................................................................................................................................1 - 49
CPU Board ...........................................................................................................................................................................................................1 - 57
Ventilator Control and Drive........................................................................................................................................................ 1 - 60
Mother Board..................................................................................................................................................................................................... 1 - 60
Ventilator Control and Drive Board ...........................................................................................................................................................1 - 70
Battery .................................................................................................................................................................................................................. 1 - 77
Infrared Communication Board .................................................................................................................................................................. 1 - 79
Anesthesia Signal Interface Board.............................................................................................................................................................. 1 - 80
Breathing System Heater...............................................................................................................................................................................1 - 81
Electrical Flow Control System.................................................................................................................................................... 1 - 81
EFCS Monitoring Board .................................................................................................................................................................................. 1 - 81
BFCS Position Board ........................................................................................................................................................................................ 1 - 85
Total Flow Meter Backlight Board ..............................................................................................................................................................1 - 86
Air Flow Sensor Interface Board..................................................................................................................................................................1 - 86
Nitrous Oxide Flow Sensor Interface Board............................................................................................................................................ 1 - 88
O2 Flow Sensor Interface Board.................................................................................................................................................................. 1 - 89
Ventilator Pneumatic- O2 Drive Gas ......................................................................................................................................... 1 - 91
Ventilator Pneumatic Drive...........................................................................................................................................................................1 - 91
Drive Pressure-High Pressure Regulator (200 kPa, 29 psi).................................................................................................................1 - 91
Drive Gas Assembly ......................................................................................................................................................................................... 1 - 91
Tube Color Coding........................................................................................................................................................................................... 1 - 91
Installation Guide ................................................................................................................................................ 2 - 1
Preparation - Additional Material Required ..............................................................................................................................2 - 2
Assembly................................................................................................................................................................................................2 - 3
Unpacking and Setup ........................................................................................................................................................................................2 - 3
Breathing System and Breathing System Accessories and Checkout Procedures................................................................... 2 - 18
Vaporizers (if available) .................................................................................................................................................................................. 2 - 18
A7™ Service Manual 046-006272-00 i
Table of Contents
Monitoring Products Mounting and Electrical Connection (if available).....................................................................................2 - 19
Functional Tests................................................................................................................................................................................ 2 - 20
Breathing System Leak Test..........................................................................................................................................................................2 - 20
Automatic Backup Flow Control Test........................................................................................................................................................ 2 - 27
Display Setup Check........................................................................................................................................................................................ 2 - 30
Calibrate the AG Module ...............................................................................................................................................................................2 - 30
Gas Module Verification.................................................................................................................................................................................2 - 32
Gas Delivery System Tests............................................................................................................................................................................. 2 - 32
Pneumatic Leak Tests ..................................................................................................................................................................... 2 - 35
Line Pressure Gauges Accuracy Test .........................................................................................................................................................2 - 35
N2O Cylinder Leak Test ..................................................................................................................................................................................2 - 35
O2 Cylinder Leak Test...................................................................................................................................................................................... 2 - 35
AIR Cylinder Leak Test..................................................................................................................................................................................... 2 - 36
Line Pressure Leak Tests................................................................................................................................................................................. 2 - 36
Breathing System Checks.............................................................................................................................................................. 2 - 38
Waste Gas Scavenger Test (if available) ................................................................................................................................................... 2 - 38
Internal Gas Connections Test..................................................................................................................................................................... 2 - 38
Drive Gas Pressure Loss Alarm, N2O Cutoff Test................................................................................................................................... 2 - 42
Performance Verification............................................................................................................................................................... 2 - 43
Manual Mode Ventilation Test.....................................................................................................................................................................2 - 43
APNEA Alarm Test ............................................................................................................................................................................................2 - 43
Alarm Silence Test............................................................................................................................................................................................ 2 - 43
VCV Adult Ventilation Mode Test ............................................................................................................................................................... 2 - 44
VCV Adult Ventilation Mode Test 2............................................................................................................................................................2 - 44
VCV Child Ventilation Mode Test................................................................................................................................................................ 2 - 45
Airway Disconnect Alarm Test..................................................................................................................................................................... 2 - 46
PCV Adult Ventilation Mode Test ............................................................................................................................................................... 2 - 46
Pressure Support (PS) Ventilation Mode Test ........................................................................................................................................ 2 - 47
Alarms and Fail safe Functions.................................................................................................................................................... 2 - 48
Set Up....................................................................................................................................................................................................................2 - 48
Low O2 Alarm Test........................................................................................................................................................................................... 2 - 48
High O2 Alarm Test..........................................................................................................................................................................................2 - 48
Peak Pressure Alarms Test............................................................................................................................................................................. 2 - 49
Minute Volume Alarm Test ...........................................................................................................................................................................2 - 49
Miscellaneous Tests......................................................................................................................................................................... 2 - 50
Test the Line Voltage Alarm.......................................................................................................................................................................... 2 - 50
Top Light and Auxiliary Light Test..............................................................................................................................................................2 - 50
Touchpad Test................................................................................................................................................................................................... 2 - 50
Module Rack Functional Test ....................................................................................................................................................................... 2 - 50
Vaporizer Interlock Test................................................................................................................................................................. 2 - 51
For 2 vaporizer Mount .................................................................................................................................................................................... 2 - 51
For 3 vaporizer Mount .................................................................................................................................................................................... 2 - 51
Vaporizer Accuracy Test ................................................................................................................................................................ 2 - 52
Suction Regulator Test................................................................................................................................................................... 2 - 52
Electrical Tests................................................................................................................................................................................... 2 - 53
Auxiliary Electrical Outlet Test..................................................................................................................................................................... 2 - 53
Electrical Safety Inspection Test..................................................................................................................................................................2 - 53
Electrical Safety Inspection Form................................................................................................................................................................ 2 - 53
Periodic Maintenance.......................................................................................................................................... 3 - 1
Maintenance Schedule .....................................................................................................................................................................3 - 2
Periodical Maintenance Consumable Parts Kits ......................................................................................................................3 - 2
Periodical Maintenance Schedule ................................................................................................................................................3 - 2
Checklist before surgery................................................................................................................................................................... 3 - 3
Visual Inspection Checklist ..............................................................................................................................................................3 - 4
List of Periodic Maintenance Parts to be Replaced and Checked .....................................................................................3 - 4
Battery Maintenance and Replacement .....................................................................................................................................3 - 8
Functional Tests...................................................................................................................................................................................3 - 8
ii 046-006272-00 A7™ Service Manual
Table of Contents
Breathing System Leak Test.............................................................................................................................................................................3 - 9
Automatic Backup Flow Control Test........................................................................................................................................................ 3 - 16
Check the AG Module Accuracy................................................................................................................................................................. 3 - 20
Gas Module Verification.................................................................................................................................................................................3 - 21
Gas Delivery System Tests............................................................................................................................................................................. 3 - 21
Check the Sensor Zero Point........................................................................................................................................................................ 3 - 24
Check the Flow Sensor Accuracy................................................................................................................................................................3 - 25
Check the Pressure Sensor Accuracy.........................................................................................................................................................3 - 28
Total Flow Sensor Self Test............................................................................................................................................................................ 3 - 33
Pneumatic Leak Tests ..................................................................................................................................................................... 3 - 33
Line Pressure Gauges Accuracy Test .........................................................................................................................................................3 - 33
N2O Cylinder Leak Test ..................................................................................................................................................................................3 - 34
O2 Cylinder Leak Test...................................................................................................................................................................................... 3 - 34
AIR Cylinder Leak Test..................................................................................................................................................................................... 3 - 34
Line Pressure Leak Tests................................................................................................................................................................................. 3 - 35
Breathing System Checks.............................................................................................................................................................. 3 - 37
Waste Gas Scavenger Test (if available) ................................................................................................................................................... 3 - 37
Internal Gas Connections Test..................................................................................................................................................................... 3 - 37
Drive Gas Pressure Loss Alarm, N2O Cutoff Test................................................................................................................................... 3 - 40
Performance Verification............................................................................................................................................................... 3 - 41
Manual Mode Ventilation Test.....................................................................................................................................................................3 - 41
APNEA Alarm Test ............................................................................................................................................................................................3 - 41
Alarm Silence Test............................................................................................................................................................................................ 3 - 41
VCV Adult Ventilation Mode Test ............................................................................................................................................................... 3 - 42
VCV Child Ventilation Mode Test................................................................................................................................................................ 3 - 42
Airway Disconnect Alarm Test..................................................................................................................................................................... 3 - 43
PCV Adult Ventilation Mode Test ............................................................................................................................................................... 3 - 43
Pressure Support (PS) Ventilation Mode Test ........................................................................................................................................ 3 - 44
Alarms and Fail safe Functions.................................................................................................................................................... 3 - 44
Set Up....................................................................................................................................................................................................................3 - 44
Low O2 Alarm Test........................................................................................................................................................................................... 3 - 45
High O2 Alarm Test..........................................................................................................................................................................................3 - 45
Peak Pressure Alarms Test............................................................................................................................................................................. 3 - 45
Minute Volume Alarm Test ...........................................................................................................................................................................3 - 46
Miscellaneous Tests......................................................................................................................................................................... 3 - 47
Test the Line Voltage Alarm.......................................................................................................................................................................... 3 - 47
Top Light and Auxiliary Light Test..............................................................................................................................................................3 - 47
Touchpad Test................................................................................................................................................................................................... 3 - 47
Module Rack Functional Test ....................................................................................................................................................................... 3 - 47
Vaporizer Interlock Test................................................................................................................................................................. 3 - 48
For 2 vaporizer Mount .................................................................................................................................................................................... 3 - 48
For 3 vaporizer Mount .................................................................................................................................................................................... 3 - 48
Vaporizer Accuracy Test ................................................................................................................................................................ 3 - 49
Suction Regulator Test................................................................................................................................................................... 3 - 49
Electrical Tests................................................................................................................................................................................... 3 - 50
Auxiliary Electrical Outlet Test..................................................................................................................................................................... 3 - 50
Electrical Safety Inspection Test..................................................................................................................................................................3 - 50
Electrical Safety Inspection Form................................................................................................................................................................ 3 - 51
Calibration............................................................................................................................................................ 4 - 1
Introduction..........................................................................................................................................................................................4 - 2
Calibration Warnings, Precautions, and Notes......................................................................................................................... 4 - 2
Warnings.................................................................................................................................................................................................................4 - 2
Cautions..................................................................................................................................................................................................................4 - 2
Notes........................................................................................................................................................................................................................4 - 3
System Calibration..............................................................................................................................................................................4 - 3
Flow Calibration (User)......................................................................................................................................................................................4 - 4
Flow Calibration (Service).................................................................................................................................................................................4 - 8
Pressure Calibration (Service) ......................................................................................................................................................................4 - 30
Pressure and Flow Zeroing (Service) .........................................................................................................................................................4 - 45
A7™ Service Manual 046-006272-00 iii
Table of Contents
EFCS Zeroing (User) ........................................................................................................................................................................................4 - 49
Total Flow Sensor Calibration (factory) ....................................................................................................................................................4 - 53
Calibrate the AG Module ...............................................................................................................................................................................4 - 56
..........................................................................................................................................................Cylinder Yoke Regulator Calibration4 - 57
Adjust the back pressure valve....................................................................................................................................................................4 - 60
Repair and Troubleshooting............................................................................................................................... 5 - 1
Troubleshooting Guidelines ...........................................................................................................................................................5 - 2
Identify the problem ..........................................................................................................................................................................................5 - 2
Avoid shorting component leads together...............................................................................................................................................5 - 2
Use the proper equipment ..............................................................................................................................................................................5 - 2
Clean up the repair area....................................................................................................................................................................................5 - 2
Technical Alarms Check....................................................................................................................................................................5 - 3
Startup Alarm Messages ...................................................................................................................................................................................5 - 4
CPU Board Runtime Alarm ...............................................................................................................................................................................5 - 8
Power Board Runtime Alarm...........................................................................................................................................................................5 - 8
Runtime Alarms of Flow Sensor Board.....................................................................................................................................................5 - 10
Ventilator Control Board Runtime Alarm.................................................................................................................................................5 - 16
Real-time Alarms of External AG Module.................................................................................................................................................5 - 19
Runtime Alarms of Internal AG Module ........................................................... 5 - 22
Pneumatic Circuit System Problems......................................................................................................................................... 5 - 23
Tools for on-site Maintenance ..................................................................................................................................................................... 5 - 23
Gas Supplies and Drive Gas ..........................................................................................................................................................................5 - 32
Anesthetic Gas Delivery System..................................................................................................................................................................5 - 41
Breathing System ............................................................................................................................................................................................. 5 - 53
Tidal Volume ...................................................................................................................................................................................................... 5 - 68
Sensors and Valves Problems ...................................................................................................................................................... 5 - 71
Correspondence with Pneumatic Circuit Components ..................................................................................................................... 5 - 71
Correspondence with Hardware Components ..................................................................................................................................... 5 - 71
Preparations before Using Diagnostic Tests........................................................................................................................................... 5 - 72
Zero Points of Flow & Pressure Sensors Problems ............................................................................................................................... 5 - 72
Connections and Measurement of the Flow Sensors Problems......................................................................................................5 - 73
Connections and Measurement of the Pressure Sensors Problems.............................................................................................. 5 - 73
Opening State of the Inspiratory Valve Problems ................................................................................................................................ 5 - 75
Opening States of the PEEP Safety Valve Problems............................................................................................................................. 5 - 75
Opening State of the PEEP Valve Problems............................................................................................................................................5 - 76
Basal Flow Adjustment of O2 Needle Valve............................................................................................................................................ 5 - 77
Hardware and Electrical Problems............................................................................................................................................. 5 - 79
Software Update and Software Configuration Activation................................................................................................ 5 - 81
Repair and Disassembly ...................................................................................................................................... 6 - 1
Prepare for Disassembly...................................................................................................................................................................6 - 2
Tools.........................................................................................................................................................................................................................6 - 2
Preparations ..........................................................................................................................................................................................................6 - 2
Bleed Gas Pressure..............................................................................................................................................................................................6 - 2
Disassemble the Assemblies........................................................................................................................................................... 6 - 3
Disassemble the Internal Assemblies of the Machine Upper Half.....................................................................................................6 - 3
Disassemble Hardware Box ..........................................................................................................................................................................6 - 14
Disassemble the Work Surface.................................................................................................................................................................... 6 - 27
Disassemble the Auxiliary Work Surface.................................................................................................................................................. 6 - 36
Disassemble the Display................................................................................................................................................................................6 - 38
Remove the Module Rack Assembly ......................................................................................................................................................... 6 - 47
Remove the Module Rack Fan .....................................................................................................................................................................6 - 48
Remove the Panel of Pressure Gauges.....................................................................................................................................................6 - 49
Disassemble the Vacuum Suction Related Assembly......................................................................................................................... 6 - 57
Remove the Auxiliary Gas Outlet Assembly............................................................................................................................................ 6 - 59
Remove the Rotating Block of Breathing Circle .................................................................................................................................... 6 - 60
Remove the AGSS Assembly ........................................................................................................................................................................6 - 61
Remove the Electronically Controlled ACGO Drive Valve.................................................................................................................. 6 - 62
Remove the Built-in Anesthesia Module..................................................................................................................................................6 - 63
Remove the ACGO Assembly (electronically controlled)................................................................................................................... 6 - 65
Remove Anesthesia Module Inlet Pipeline Assembly.........................................................................................................................6 - 66
iv 046-006272-00 A7™ Service Manual
Table of Contents
Disassemble the Base Assembly................................................................................................................................................................. 6 - 67
Disassemble the Breathing System........................................................................................................................................... 6 - 71
Remove the Breathing Tubes....................................................................................................................................................................... 6 - 71
Remove the Flow Sensor ............................................................................................................................................................................... 6 - 72
Remove the Manual Bag................................................................................................................................................................................6 - 73
Remove the Absorbent Canister................................................................................................................................................................. 6 - 74
Remove the CO2 Bypass Assembly............................................................................................................................................................6 - 76
Remove the Prepak Handle ..........................................................................................................................................................................6 - 77
Remove the Contact Switch of the L-shaped Handle ......................................................................................................................... 6 - 78
Remove the Patient Circle Assembly.........................................................................................................................................................6 - 79
Remove the Bellows Assembly....................................................................................................................................................................6 - 80
Remove the Pop-off Valve Assembly ........................................................................................................................................................ 6 - 81
Disassemble the Expiratory/Inspiratory Check Valve Assemblies ..................................................................................................6 - 82
Remove the Water Collection Cup.............................................................................................................................................................6 - 83
Remove the Airway Pressure Gauge ......................................................................................................................................................... 6 - 84
Remove the Bag Arm ...................................................................................................................................................................................... 6 - 84
Remove the Back Upper Cover and Back Lower Cover Assemblies............................................................................................... 6 - 85
Remove the Front Upper Cover, Median Plate and Front Lower Cover Assemblies ...............................................................6 - 87
Disassemble the Automatic/Manual Ventilation Switch Assembly ............................................................................................... 6 - 90
Remove the APL Valve Assembly ............................................................................................................................................................... 6 - 92
Replacement Parts............................................................................................................................................... 7 - 1
Introduction..........................................................................................................................................................................................7 - 2
Ordering Replaceable Parts.............................................................................................................................................................................7 - 2
Diagrams and Tables..........................................................................................................................................................................................7 - 3
Warranty............................................................................................................................................................... 8 - 1
Warranty Statements.........................................................................................................................................................................8 - 2
Disclaimers ............................................................................................................................................................................................8 - 3
Manufacturer's Responsibility........................................................................................................................................................8 - 3
Phone Numbers and How to Get Assistance............................................................................................................................8 - 3
A7™ Service Manual 046-006272-00 v
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vi 046-006272-00 A7™ Service Manual
Foreword Introduction
Foreword
This Service Manual is intended as a guide for technically qualified personnel performing repair and
calibration procedures.
Warnings, Cautions, and Notes
Please read and adhere to all warnings, cautions, and notes listed here and in the appropriate areas
throughout this manual.
A WARNING is provided to alert the user to potential serious outcomes (death, injury, or serious
adverse events) to the patient or the user.
A CAUTION is provided to alert the user to use special care necessary for the safe and effective use of
the device. They may include actions to be taken to avoid effects on patients or users that may not be
potentially life threatening or result in serious injury, but about which the user should be aware.
Cautions are also provided to alert the user to adverse effects on this device of use or misuse and the
care necessary to avoid such effects.
A NOTE is provided when additional general information is applicable.
Warnings
WARNING: Whenever using anesthetic gases, nitrous oxide, oxygen, or any
WARNING: Use only an approved lubricant on any O-ring in contact with oxygen.
WARNING: For continued protection against fire hazard, replace all fuses with the
WARNING: In order to prevent an electric shock, the machine (protection class I)
WARNING: Remove all accessory equipment from the shelf before moving the
WARNING: Possible explosion hazard. Do not operate machine near flammable
WARNING: The use of anti-static or electrically conductive respiration tubes, when
hospital gas, always follow the appropriate agent evacuation/
collection procedures. Use the hospital gas evacuation system.
Krytox® is the recommended oxygen service lubricant.
specified type and rating.
may only be connected to a correctly grounded mains connection
(socket outlet with grounding contact).
anesthesia machine over bumps or on any inclined surface. Heavy top
loading can cause the machine to tip over causing injury.
anesthetic agents or other flammable substances. Do not use
flammable anesthetic agents (e.g., ether or cyclopropane.)
utilizing high frequency electric surgery equipment, may cause burns
and is therefore not recommended in any application of this machine.
WARNING: Possible electric shock hazard. The machine may only be opened by
authorized service personnel.
A7™ Service Manual 046-006272-00 vii
Introduction Cautions
WARNING: Compressed gasses are considered Dangerous Goods/Hazardous
WARNING: Avoid exposure to respiratory gases by always directing the fresh gas
WARNING: When using the AG module to perform AG measurements on the
WARNING: Remove the airway sampling line from the patient’s airway and seal the
WARNING: Before connecting the exhaust line to the sample gas outlet on the
WARNING: Perform factory calibration in the working environment after
Materials per I.A.T.A (International Air Transport Association). and
D.O.T. (Department Of Transport) regulations. It is a violation of federal
and international law to transport dangerous goods without the
packages being appropriately identified, packed, marked, classified,
labeled and documented according to D.O.T. and I.A.T.A. regulations.
Please refer to the applicable I.A.T.A. Dangerous Goods Regulations
and /or the Code of Federal Regulations 49 (Transportation, Parts 171-
180) for further information.
flow from the fresh gas outlet to the waste gas scavenger.
patients who are receiving or have recently received anesthetic
agents,connect the outlet to the waste gas disposal system to prevent
the medical staff from breathing in the anesthetic agents.
sample port while nebulized medications are being
delivered.Nebulized medications interfere with accuracy gas reading.
compact airway module,ensure the other end is connected to the
sample gas return port on the anesthesia machine.Incorrect
connections may cause patient injury.
completion of anesthesia machine assembling.Contact us if factory
calibration is required during system use.
WARNING: Do not perform testing or maintenance on A7 anesthesia machine
WARNING: Items can be contaminated due to infectious patients.Wear sterile
WARNING: Obey infection control and safety procedures.Used equipment may
while it is being used on a patient.Possible injury can result.
rubber gloves.Contamination can spread to you and others.
contain blood and body fluids.
Cautions
CAUTION: This device uses high pressure compressed gas. When attaching or
disconnecting backup gas cylinders, always turn the cylinder valves
slowly. Use the A7 flow meters to bleed down the pressure, watching
the cylinder gauge indicate the depleting cylinder pressure, before
disconnecting the cylinder from the yoke. Always open and close
cylinder valves fully.
CAUTION: This device operates using compressed gas at high pressures from the
CAUTION: Refer to section 3.3 Periodical Maintenance Schedule for assistance
hospital central supply. When connecting gas supply lines attach the
hose connection to the machine before connecting the quick
disconnect fitting to the hospital source. Disconnect the supply hose
from the hospital source connection prior to disconnecting it from the
A7 gas connection fittings.
when performing scheduled periodic maintenance.
viii 046-006272-00 A7™ Service Manual
Notes Introduction
CAUTION: Do not leave gas cylinder valves open if the pipeline supply is in use
CAUTION: Use cleaning agent sparingly. Excess fluid could enter the machine,
CAUTION: This machine must only be operated by trained, skilled medical staff.
CAUTION: Perform the electrical safety inspection as the last step after
CAUTION: After changing the CO2 absorbent, carry out a vaporizer and system
CAUTION: Only Selectatec™ compatible vaporizers with Interlock-System may be
CAUTION: After each exchange of a vaporizer, carry out a system Leak test.
CAUTION: Do not clean the machine while it is on and/or plugged in.
CAUTION: Pressing "cancel" at any time during the procedure will cancel the
CAUTION: Depleted sodalime changes color. Replace the sodalime if
and the system master switch is turned to 'ON'. If used simultaneously,
cylinder supplies could be depleted, leaving an insufficient reserve
supply in the event of pipeline failure.
causing damage.
completing a repair or after routine maintenance. Perform this
inspection with all covers, panels, and screws installed.
leak test.
used with the A7 unit.
session's settings and reload the previously-stored calibration
coefficients.
approximately 2/3 of the absorber content is discolored. CO2 absorbent
can be safely changed without stopping mechanical ventilation.
CAUTION: This equipment contains parts sensitive to damage by electrostatic
discharge (ESD). Use ESD precautionary procedures when touching,
removing, or inserting parts or assemblies.
CAUTION: The watertrap collects water drops condensed in the sampling tube and
therefore prevents them from entering the AG module.If the collected
water reaches a certain amount, you should drain it to avoid airway
blockage.
CAUTION: The watertrap has a filter preventing bacterium,vapor and patient
secretions from entering the module.After a long-term use,dust or
other subtances may compromise the performance of the filter or even
block the airway.In the case, replace the watertrap.Replacing the
watertrap once a month is recommended.
CAUTION: Strong scavenging suction on the AG monitor exhaust port nay change
the operating presure of the monitor and cause inaccurate readings or
internal damage.
Notes
NOTE: Unauthorized servicing may void the remainder of the warranty. Check
with the factory or with a local authorized distributor to determine the
warranty status of a particular instrument.
A7™ Service Manual 046-006272-00 ix
Introduction Notes
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x 046-006272-00 A7™ Service Manual
1.0
Theory of Operation
Introduction .................................................................................................................................................................................................1-2
Electrical and Pneumatic Connections .......................................................................................................................................1-4
Gas Flow ......................................................................................................................................................................................................1-12
Anesthesia System Components.................................................................................................................................................1-42
The Breathing System......................................................................................................................................................................... 1-44
Ventilator UI............................................................................................................................................................................................... 1-49
Ventilator Control and Drive........................................................................................................................................................... 1-49
Electrical Flow Control System...................................................................................................................................................... 1-81
Ventilator Pneumatic- O2 Drive Gas........................................................................................................................................... 1-91
A7™ Service Manual 046-006272-00 1 - 1
Introduction Theory of Operation
1.1 Introduction
The A7 Anesthesia System is a simple and convenient anesthetic gas delivery system that produces
anesthesia gas and controls delivery of anesthesia gas by using a configured vaporizer. It supports
automatic and manual ventilation. It can also monitor various parameters of patients, such as the
airway pressure, inspired tidal volume and expired tidal volume.
The A7 Anesthesia System provides the following ventilation modes:
• Volume Control Ventilation (VCV), which includes the Pressure Limit Ventilation (PLV) function
• Pressure Control Ventilation (PCV) with/without the Volume Guarantee (VG) ventilation mode
• Synchronized Intermittent Mandatory Ventilation (SIMV) with the VC mode
• SIMV with the PC mode
• Pressure Support (PS) ventilation mode
• Spontaneous ventilation in Manual mode with the Airway Pressure Limit (APL) fully open
• Manual Ventilation through the use of a breathing bag
• Electronic Positive End Expiratory Pressure (PEEP) is available in all ventilation modes. Control over
inspiratory flow (Tslope) is possible in PCV, SIMV, and PS modes. Automatic fresh gas
compensation helps patients suffer less from manual changes in fresh gas flow rate. The
traditional bellows system is driven by gas and makes patient ventilation clearly visible.
The A7 fresh gas electronic flow metering system inherits the features of a traditional anesthesia
system and moreover is enhanced in ease of use. The dual-tube electronic flow meter displays more
precise readouts. A knob guard prevents inadvertent movement of the flow control knobs. Gas
supply gauges indicate the pipeline and cylinder gas supply pressures in real time. An auxiliary O2
flow meter is placed on the upper left to make it convenient to read the O2 flow rate. The O2 flush
button is in the traditional position near the front left corner of the table top.
Safety systems within the A7 work to prevent hypoxic mixtures from being delivered to the patient.
Nitrous oxide will not be delivered unless oxygen pressure is present.
The heating system of the A7 patient breathing circuit minimizes condensed water and sends warm
and humidified gas back to the patient. The pressure gauge, APL valve and manual breathing bag of
the patient breathing circuit support fast plug and unplug to facilitate their installation and
maintenance. The APL valve has a rotary knob that provides a clear view of the manual breathing
pressure setting. The sodalime absorber canister can be opened and closed quickly through a handle.
It can absorb sodalime in standard Pre-paks or loose-fill sodalime. A drainage valve is configured for
the sodalime absorber canister.
Two flow sensors are configured on the patient breathing circuit to monitor the flow of inspired and
expired gases and monitor the airway pressure. The operator can rotate and fix the patient breathing
circuit as required. In addition, the patient breathing circuit is equipped with a side plug for gas
leakage detection. The Anesthesia Gas Scavenging System (AGSS) connectors are at the rear of the
A7.
1 - 2 046-006272-00 A7™ Service Manual
Theory of Operation Introduction
When the A7 uses AC power supply, the A7 power management system supplies power for its main
system while charging its internal battery. In case of an AC power failure, the A7 operates on battery
power, two new batteries supporting normal running in a minimum of 90 minutes. The main system
switch can power on and off the system. The four auxiliary AC sockets on the A7 at the rear of the
machine operate independent of the main system switch.
NOTE: The warmer for the patient breathing circuit system does not operate
when the A7 is working on battery power.
NOTE: If the main switch is set to OFF, the O2 supply is turned off.
A7™ Service Manual 046-006272-00 1 - 3
Electrical and Pneumatic Connections Theory of Operation
1.2 Electrical and Pneumatic Connections
1.2.1 Electrical Connections
FIGURE 1-1
1 - 4 046-006272-00 A7™ Service Manual
Theory of Operation Electrical and Pneumatic Connections
No. Description P/N
B1 Power Board (A7) 115-018145-00
B2 Battery Interface Board 801-0631-00109-00
B3 CPU Board 115-040636-00
B4 IndicatorLight Board 051-001257-00
B5 Infrared Communication Board 801-0621-00165-00
B6 Anesthesia Signal Interface Board 801-0613-00033-00
B7 Display Interface Board 051-001258-00
B8 Backlight Inverter Board
B9 Warning Light Board 801-0631-00019-00
B10 Touchscreen Control Board 801-0631-00018-00
B11 Encoder Board 051-001260-00
B12 Flow Meter Lighting Board
B13 Top Lighting Board 801-0631-00039-00
B14 Mother Board
B15-16 Ventilator Control Board 801-0631-00027-00
B17 Sensor Interface Board 801-0631-00089-00
B18 Electronic Flow Control System (EFCS) Monitor Board 115-018150-00
B19 Air Flow Sensor Interface Board 051-001415-01
B20 Nitrous Oxide Flow Sensor Interface Board 051-001416-01
B21-22 O2 Flow Sensor Interface Board 051-001414-01
B23 Total Flow Meter Backlight Board Part of 115-014479-00
B24 BFCS Position Board 051-001286-01
P1 Filter Power 250VAC 15A Panel Mount 801-0631-00029-00
P2 Breaker(10.0A) 801-0631-00030-00
P3-6 Breaker(3.0A) 801-0631-00031-00
P7-10 Auxiliary Output Socket 801-0631-00032-00
P11 Speaker and Connecting cable 801-0631-00038-00
P12 Hardware Box Fan 801-0631-00028-00
P13-14 Lithium-ion Battery 115-018012-00
P15 Button Cell M05-010R03---
P16 Touchpad 801-0631-00052-00
P17 Gas Bench Fan 024-000407-00
P18 Touch Screen 801-0631-00014-00
P19 LCD 115-039181-00
P20-21 Rotary Encoder 010-000150-00
P22 Cable, Lighting Switch 009-000981-00
P23 Circuit Heater 115-034450-00
C1-4 Cable, Power, AC Internal 009-000985-01
051-001519-00 (old)
051-002583-00 (new)
Part of 115-01816500(FDA)
Part of 115-01816600(Canadian)
051-001259-00
051-002662-00 (VGA)
A7™ Service Manual 046-006272-00 1 - 5
Electrical and Pneumatic Connections Theory of Operation
No. Description P/N
C5 Cable, Auxiliary Outlet 009-000984-00
C6 Cable, AC power 009-000983-00
C8 Cable, Indicator 009-000977-00
C9 Cable, System Switch 009-001776-00
C10 Cable, Touchpad 009-000972-00
C11 Cable, Patient Monitor 009-002927-00
C12 Cable, ACGO Valve Status 009-002940-00
C13 Cable, Internal AG Module 009-003131-00
C14 Cable, Display 009-000973-00
C15
C16
C17 Cable, Alarm 009-000976-00
C18 Cable, Touch Screen 009-000978-00
C19 Cable, Encoder Board 009-002932-00
C20 Cable, Display Lighting 009-000986-00
C21 Cable, Top Lighting A 009-000982-00
C22 Cable, O2 Pressure Switch 0621-20-69588
C24 2-pin O2 Sensor Pedestal 801-0631-00067-00
C25 Cable, Circuit Switch 0621-20-78593
C26 Cable, Sodalime Canister Switch Cable 009-000987-00
C28 Cable, Breathing System 009-002928-00
C29 Cable, BFCS Position Switch 009-002930-00
C30 Cable, Total Flowmeter Backlight 009-002931-00
C31 Cable, Flowmeter Switch Signal 009-002929-00
C32 Cable, Backup Needle Valve Switch(without N2O) 009-005146-00
C34 Cable, Flow Sensor 009-002481-01
C35 Cable, Flowmeter 3 way Valve B 009-002937-00
C37 Cable, Ventilator 009-000979-00
C39 Cable, Three Way Valve(ACGO) 009-002592-00
0631 inverter control high-voltage lines (old)
0632 screen backlight output cable (new)
0631 inverter cable B (old)
0635 screen LED backlight input cable (new)
009-000974-00 (old)
009-006731-00 (new)
009-000988-00 (old)
009-006382-00 (new)
1 - 6 046-006272-00 A7™ Service Manual
Theory of Operation Electrical and Pneumatic Connections
1.2.2 Pneumatic Connections (A7)
FIGURE 1-2
A7™ Service Manual 046-006272-00 1 - 7
Electrical and Pneumatic Connections Theory of Operation
S/N From To P/N
25 Total Flow Meter Vaporizer Manifold M6G-020045---
26 Back Pressure Regulator Total Flow Meter M6G-020045---
28 AIR Needle Valve Gas Mixer 082-000518-00
29 O2 Needle Valve Gas Mixer 082-000523-00
34 N2O Cylinder Yoke Y4 082-000662-00
35 Y4 N2O Regulator 082-000662-00
36 Air Cylinder Yoke Y1 or Y4 082-000517-00
37 Y4 Air Regulator 082-000517-00
38 Y4 Y1 082-000521-00
39 O2 Pipeline Pressure Gauge O2 Pipeline Assembly 082-000523-00
40 N2O Pipeline Pressure Gauge N2O Pipeline Assembly 082-000516-00
41 Air Pipeline Pressure Gauge AIR Pipeline Assembly 082-000518-00
42 O2 Regulator Y5 082-000522-00
43 Y5 System Switch 082-000522-00
44 Y5 O2 Flush Button 082-000522-00
45 System Switch Y5 082-000522-00
47 Y4 O2 Regulator 082-000521-00
50 Air Regulator Y5 082-000520-00
51 Y6 Air Needle Valve 082-000518-00
52 O2 Flush Button ACGO Assembly(Electric) 082-000522-00
53 Vaporizer Manifold ACGO Assembly(Electric) M6G-020045---
54 Y4 Air Pipeline Assembly 082-000517-00
55 Exhalation Valve Assembly Gas Reservoir 082-000522-00
57 Y5 Auxiliary O2 Assembly 082-000522-00
58 Electronic Flowmeter Back Pressure Regulator M6G-020045---
59 Y4 O2 Pipeline Assembly 082-000521-00
60 O2 Cylinder Yoke Y1 082-000521-00
61 Y1 Y1 082-000521-00
62 Y4 N2O Pipeline Assembly 082-000662-00
63 Y1 Exhalation Valve Assembly 082-000521-00
64 Auxiliary Air Assembly Y2 082-000520-00
65 Auxiliary O2 Assembly Y2 082-000522-00
66 Y2 Auxiliary Gas Outlet M6G-020026---
67 Y5 Auxiliary Air Assembly 082-000520-00
69 Y1 Auxiliary Gas Outlet 082-000521-00
79 Y4 O2 Pipeline Assembly 082-000521-00
110 Y5 Y6 082-000522-00
111 Y5 Y2 082-000522-00
112 Y2 Drive Valve(UP) 082-000522-00
113 Y2 Drive Valve(DOWN) 082-000522-00
114 Drive Valve(DOWN) ACGO Assembly(Electric) 082-000522-00
115 Drive Valve(UP) ACGO Assembly(Electric) 082-000522-00
1 - 8 046-006272-00 A7™ Service Manual
Theory of Operation Electrical and Pneumatic Connections
S/N From To P/N
117 Y5 Electronic Flowmeter 082-000522-00
118 Y5 Electronic Flowmeter 082-000520-00
119 N2O Regulator Electronic Flowmeter 082-000516-00
120 Electronic Flowmeter 3-way Valve Assembly M6G-020045---
121 Y1 3-way Valve Assembly M6G-020045---
122 Gas Mixer Y1 M6G-020045---
123 3-way Valve Assembly Electronic Flowmeter M6G-020045---
124 Y1 System Switch M6G-020045---
125 Y4 AIR Pipeline Assembly 082-000517-00
126 Y4 N2O Pipeline Assembly 082-000662-00
127 Multigas Analyzer Plug 9200-10-10556
128 Multigas Analyzer Multigas Analyzer 9200-10-10556
129 Multigas Analyzer
130 Fitting Φ4 Multigas Analyzer 115-017879-00
137 Y6 O2 Needle Valve 082-000523-00
142 Y5 Y6 082-000520-00
143
147 Pipeline Vacuum Suction Control M6G-020045---
148 Suction Control Over flow Unit M6G-020045---
Y1 Three-way Connector 8 \ 082-000583-00
Y2 Three-way Connector 6 \ 082-000582-00
Y4 Four-way Connector 8 \ 082-001197-00
Y5 Four-way Connector 6 \ 082-001201-00
Y6 Two-way Connector 6 to 4 \ 082-001285-00
Gas-out Connector of ACGO
Connector
Gas-out Connector of ACGO
Connector
Fitting Φ4 082-002600-00
9200-10-10557
A7™ Service Manual 046-006272-00 1 - 9
Electrical and Pneumatic Connections Theory of Operation
1.2.3 Connections Between Pneumatic Circuit, Breathing System and Ventilator Control Board
FIGURE 1-3
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Theory of Operation Electrical and Pneumatic Connections
S/N From To P/N
1 Exhalation Gas Assembly Flow Sensor connector A21-000007---
2 Exhalation Gas Assembly Hardware Box Connector A21-000007---
3 Exhalation Gas Assembly Flow sensor connector A21-000007---
4 Three-way Valve Ventilator Control Board A21-000007---
5 Three-way Valve Y2 A21-000007---
6 Three-way Valve Ventilator Control Board A21-000007---
7 Three-way Valve Y2 A21-000007---
8 Y2 Ventilator Control Board A21-000007---
9 Y2 Ventilator Control Board A21-000007---
10 Hardware Box Connector Y1 A21-000007---
11 Y1 Breathing System Connector M6G-020046---
12 Hardware Box Connector Y1 A21-000007---
13 Y1 Breathing System Connector M6G-020046---
14 Hardware Box Connector Y1 A21-000007---
15 Y1 Breathing System Connector M6G-020046---
16 Hardware Box Connector Y1 A21-000007---
17 Y1 Breathing System Connector M6G-020046---
18 Exhalation Gas Assembly Gas Reservoir 082-002365-00
21
22
23 Breathing System Connector Exhalation Gas Assembly 115-037606-00
24 Breathing System Connector Gas Reservoir 115-034449-00
72 Hardware Box Connector Ventilator Control Board A21-000007---
80 Hardware Box Connector Ventilator Control Board A21-000007---
82 Hardware Box Connector Ventilator Control Board A21-000007---
84 Hardware Box Connector Ventilator Control Board A21-000007---
86 Hardware Box Connector Y2 A21-000007---
88 Y2 Three-way Valve A21-000007---
94 Y1 Hardware Box Connector A21-000007---
95 Independent Outlet of ACGO Y1 M6G-020046---
96 Hardware Box Connector Three-way Valve A21-000007---
98 Hardware Box Connector Three-way Valve A21-000007---
116 CPC Connector Breathing System Connector M6G-020026---
141 Gas Reservoir Exhaust Gas Letout Pipe 082-002365-00
155 Breathing System Connector Exhalation Gas Assembly 115-037605-00
Y1 Two-way Connector \ M02A-10-25945
Y2 Three-way Connector \ M90-100030---
Gas-out Connector of ACGO
Connector
Gas-out Connector of ACGO
Connector
Independent Outlet of ACGO 082-000519-00
Fresh Gas 082-000519-00
A7™ Service Manual 046-006272-00 1 - 11
Gas Flow Theory of Operation
1.3 Gas Flow
1.3.1 Pneumatic Circuit Diagram
62
50
60
59
52
Gas Bench
48
49
45
51
61
44
43
47
33
43
46
45
33
Pipeline Suction
66
67
68
69
70
53
12
1&
54
55
38
57
56
24
58
19
18
17
16
10
23
33
22
21
20
26
25
31
12
1&
27
41
40
30
31
31
19
41
42
AG
39
30
29 29
29
30
29
29
28 28
37
36
35
34
30
32
15
14
13
64
65
63
8
64
11
63
9
12
10
10
15
14
13
8
13
7
11
10
2
9
12
15
14
13
8
13
7
11
10
Supply Inlet
10
4
5
13
9
7
12
10
6
FIGURE 1-4
1 - 12 046-006272-00 A7™ Service Manual
Theory of Operation Gas Flow
1.3.2 Parts List
1. O2 Gas Pipeline Connection 36. Check Valve3
2. O
3. N
4. N
5. Air Gas Pipeline Connection 40. Flow Restrictor
6. Air Gas Cylinder Connection 41. Latching Valve
7. Gas Cylinder Pressure Regulator (360kPa) 42. Electronic ACGO valve
8. Pressure Relief Valve (758kPa) 43. Bypass
9. Pressure Relief Valve (Regulator) 44. CO2 Absorber Canister
10. Drive Gas Inlet Filter 45. Inspiratory Check Valve
11. Gas Pipeline Pressure Gauge 46. Airway pressure gauge
12. Gas Cylinder Pressure Gauge 47. Inspiratory Flow Sensor
13. Check valve1 48. Expiratory Flow Sensor
14. Pressure Switch (220kPa) 49. Watertrap
15. Pressure Regulating Valve (200kPa) 50. Gas Bench
16. Pressure Regulator (200kPa) 51. Check valve
17. Inspiratory Flow Control Valve 52. APL valve
18. Inspiratory Flow Sensor 53. Breathing Bag
19. Safety Valve (110 cmH2O) 54. Auto/Manual Bag Switch
20. PEEP Safety Valve 55. Bellows
21. Drive Gas Pressure Switch (140kPa) 56. Pop-off Valve
22. PEEP Proportional Valve 57. Pressure Relief Valve (1kPa,10cmH2O)
23. Flow Restrictor 58. Negative Pressure Check Valve
24. Exhaust Valve 59. Negative Pressure Check Valve (1cmH2O)
25. Electronic Flow Control System 60. Gas Container1
26. O2 Flush Valve 61. Gas Container2
27. System Switch 62. AGSS
28. Needle Valve 63. Auxiliary Air Flowmeter
29. Check Valve2 64. Auxiliary Flow Needle Valve
30. Flow Sensor 65. Auxiliary O2 Gas Power Outlet
31. Proportional Valve 66. Suction Regulator
32. 3-way Valve 67. Vacuum Gauge
33. Pressure Sensor 68. Overflow Safety Trap
34. Backpressure Valve 69. Filter
35. Total Flowmeter 70. Collection Container
Gas Cylinder Connection 37. Dual Vaporizer Block
2
O Gas Pipeline Connection 38. Ventilator
2
O Gas Cylinder Connection 39. Pressure Relief Valve (37.9kPa)
2
A7™ Service Manual 046-006272-00 1 - 13
Gas Flow Theory of Operation
1.3.3 Key to Symbols
Filter
Pressure Gauge
Regulator
Check Valve
Gas Supply Connector
Flowmeter
Pressure Switch
1.3.4 Description
1.3.4.1 Anesthetic Gas Delivery System
The anesthetic gas delivery system is connected to the gas supply, anesthetic gas delivery device
(vaporizer) and breathing system. The system inputs N2O, O2 and AIR from the gas supply assembly
and outputs gas mixture of the three gases and anesthetic agent (fresh gas), pure O2 (high-pressure
O2 output , auxiliary O2 supply and flushing O2), or AIR-O2 mixture. The following figure shows the
pneumatic circuit of the anesthetic gas delivery system.The ACGO is configured in electrical modes
Pressure Relief Valve
Flow Control Valve
Flow Restrictor
FIGURE 1-5
1 - 14 046-006272-00 A7™ Service Manual
Theory of Operation Gas Flow
1.3.4.2 Gas Supplies
The A7 anesthesia machine supports three gas supplies: O2, N2O and AIR. All the gas supply
interfaces are designed based on IEC 60601-2-13, which prevents misconnection between different
gases. The A7 gas supply inlet assemblies comprise the pipeline gas supply inlet assembly and
cylinder gas supply inlet assembly.
The following describes the O2 gas flow. The difference between the O2 and the AIR/N2O limbs lies
in that the drive gas output and high-pressure O2 output are available at the upstream end of the
regulator (15) on the O2 limb. The configurations of other components are the same. The O2 pipeline
supply inlet assembly includes filter 10, pressure gauge 11, pressure relief valve 8, check valve 13,
pressure switch 14 and regulator 15. The cylinder gas supply inlet assembly includes the filter (10),
pressure gauge (12), pressure reducing valve (7), pressure relief value (9), check valve (13), pressure
switch (14) and regulator (15). Where, the pressure switch (14) and regulator (15) are shared by the
pipeline and cylinder gas supply limbs. The following figure is the block diagram.
The following table lists parameters of key components.
Name Supplier Description of Functions Key Index
Applied to compressed air, O2 and N2O .
Adjusts pressure and ensures
Regulator Camozzi
Pressure
switch
Pressure
relief valve
A7™ Service Manual 046-006272-00 1 - 15
AIR LOGIC
Mindray Prevents gas pressure too high.
constant output pressure at the
regulator outlet.
Reports an alarm when the gas
supply is insufficient. Pressure
switches are configured on the
O2, N2O and air limbs.
Pressure range: 0.05 to 1 MPa (7 to 145 psi)
Flow: 160 L/min (At 10 bar (145 psi) inlet
pressure, 4bar (58 psi) outlet pressure, with
0.5bar (7 psi) drop)
Precision: 0.5 to 100 PSI, +/- 0.5 tolerance on
the initial starting pressure
Alarm type: an alarm will be reported when
the gas supply pressure reduces to 32 PSI.
Pressure resistance: 300 PSI
Startup pressure: 758 kPa±20 kPa (110 psi ±
2.9 psi)
Leakage volume requirement: The leakage
volume should be smaller than 5 ml/min for
a 600 kPa pressure relief valve.
Gas Flow Theory of Operation
The following figure shows the physical pipeline gas supply inlet assembly of the system, including
the gas supply inlet assembly and regulators. The gas supply inlet assembly integrates the filter,
pressure relief valve, pressure switch and check valve. Gases regulated by the regulator will be output
to the flow control systems EFCS and BFCS.
FIGURE 1-6
The following figure shows the models of the gas supply inlet assembly and regulator. The gas from
the pipeline gas supply (280~600 kPa) enters the system through the gas supply connector. After
being cleaned by the internal filter of the inlet assembly, the gas is output to the regulator and
degraded to about 200 kPa. (The filter can be replaced after the pipeline gas supply connector is
removed).
FIGURE 1-7
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