Service Manual
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Anesthesia System
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Service Manual
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Anesthesia System
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A5™, A4™, and A3™ are U.S. trademarks of Mindray DS USA, Inc.
Selectatec® is a registered trademark of Ohmeda.
Copyright © Mindray DS USA, Inc., 2010 to 2019. All rights reserved. Contents of this publication may not be reproduced in
any form without permission of Mindray DS USA, Inc.
Table of Contents
Table of Contents
Table of Contents .................................................................................................................................................................................................................1
Foreword .................................................................................................................................................................................................................................1
Warnings, Cautions, and Notes.......................................................................................................................................................................................1
Warnings..................................................................................................................................................................................................................................1
Cautions...................................................................................................................................................................................................................................2
Notes.........................................................................................................................................................................................................................................3
Theory of Operation ............................................................................................................................................ 1 - 1
Introduction..........................................................................................................................................................................................1 - 2
Electrical and Pneumatic Connections .......................................................................................................................................1 - 4
Electrical Connections (A3/A4).......................................................................................................................................................................1 - 4
Electrical Connections (A5)..............................................................................................................................................................................1 - 7
Pneumatic Connections (A3/A4)....................................................................................................................................................................1 - 9
Pneumatic Connection (A5).......................................................................................................................................................................... 1 - 13
Connections Between Pneumatic Circuit, Breathing System and Ventilator Control Board................................................1 - 17
Gas Flow .............................................................................................................................................................................................. 1 - 20
Pneumatic Circuit Diagram...........................................................................................................................................................................1 - 20
Parts List...............................................................................................................................................................................................................1 - 21
Key to Symbols.................................................................................................................................................................................................. 1 - 22
Description.......................................................................................................................................................................................................... 1 - 22
Anesthesia System Components ............................................................................................................................................... 1 - 38
Auxiliary Outlets................................................................................................................................................................................................1 - 38
Work Light Board..............................................................................................................................................................................................1 - 38
The Breathing System .................................................................................................................................................................... 1 - 41
Brief Introduction ............................................................................................................................................................................................. 1 - 41
Automatic Mode, Inspiration .......................................................................................................................................................................1 - 41
Automatic Mode, Expiration ........................................................................................................................................................................ 1 - 42
Manual Mode, Inspiration ............................................................................................................................................................................. 1 - 42
Manual Mode, Expiration............................................................................................................................................................................... 1 - 43
Pneumatic PEEP ................................................................................................................................................................................................1 - 44
Ventilator in Standby ......................................................................................................................................................................................1 - 44
Breathing System Components.................................................................................................................................................................. 1 - 44
Ventilator UI ....................................................................................................................................................................................... 1 - 46
Display..................................................................................................................................................................................................................1 - 46
CPU Board ...........................................................................................................................................................................................................1 - 53
Ventilator Control and Drive........................................................................................................................................................ 1 - 56
Mother Board..................................................................................................................................................................................................... 1 - 56
Ventilator Control and Drive Board ...........................................................................................................................................................1 - 66
Battery ..................................................................................................................................................................................................................1 - 73
Infrared Communication Board .................................................................................................................................................................. 1 - 75
Breathing System Heater............................................................................................................................................................................... 1 - 76
Ventilator Pneumatic- O2 Drive Gas ......................................................................................................................................... 1 - 77
Ventilator Pneumatic Drive...........................................................................................................................................................................1 - 77
Drive Pressure-High Pressure Regulator (200 kPa, 29 psi).................................................................................................................1 - 77
Drive Gas Assembly ......................................................................................................................................................................................... 1 - 77
Tube Color Coding........................................................................................................................................................................................... 1 - 77
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 - 17
Vaporizers (if available) .................................................................................................................................................................................. 2 - 17
Monitoring Products Mounting and Electrical Connection (if available).....................................................................................2 - 19
Software and License Key Installation...................................................................................................................................... 2 - 22
Functional Tests................................................................................................................................................................................ 2 - 22
Breathing System Leak Test.......................................................................................................................................................................... 2 - 22
A5/A4/A3™ Service Manual 046-001141-00 1
Table of Contents
Check the AG Module Accuracy.................................................................................................................................................................. 2 - 30
Gas Module Verification................................................................................................................................................................................. 2 - 31
Gas Delivery System Tests............................................................................................................................................................................. 2 - 31
Check the Sensor Zero Point........................................................................................................................................................................ 2 - 33
Check the Flow Sensor Accuracy................................................................................................................................................................2 - 34
Check the Pressure Sensor Accuracy......................................................................................................................................................... 2 - 39
Check the electronic flowmeter accuracy ............................................................................................................................................... 2 - 43
Pneumatic Leak Tests ..................................................................................................................................................................... 2 - 46
N2O Cylinder Leak Test (A5 and A3 only)................................................................................................................................................ 2 - 46
O2 Cylinder Leak Test......................................................................................................................................................................................2 - 46
AIR Cylinder Leak Test..................................................................................................................................................................................... 2 - 46
Line Pressure Leak Tests................................................................................................................................................................................. 2 - 47
Line Pressure Gauges Accuracy Test.........................................................................................................................................................2 - 48
Breathing System Checks.............................................................................................................................................................. 2 - 49
Waste Gas Scavenger Test (if available) ................................................................................................................................................... 2 - 49
Internal Gas Connections Test..................................................................................................................................................................... 2 - 49
Drive Gas Pressure Loss Alarm, N2O Cutoff Test................................................................................................................................... 2 - 50
Performance Verification............................................................................................................................................................... 2 - 50
Manual Ventilation Test ................................................................................................................................................................................. 2 - 50
Manual Mode Ventilation Test..................................................................................................................................................................... 2 - 50
APNEA Alarm Test ............................................................................................................................................................................................ 2 - 51
Alarm Silence Test............................................................................................................................................................................................ 2 - 51
VCV Adult Ventilation Mode Test ............................................................................................................................................................... 2 - 52
VCV Adult Ventilation Mode Test 2............................................................................................................................................................2 - 52
VCV Child Ventilation Mode Test................................................................................................................................................................ 2 - 53
Airway Disconnect Alarm Test.....................................................................................................................................................................2 - 54
PCV Adult Ventilation Mode Test ............................................................................................................................................................... 2 - 54
Pressure Support (PS) Ventilation Mode Test ........................................................................................................................................ 2 - 55
Alarms and Fail safe Functions.................................................................................................................................................... 2 - 56
Set Up....................................................................................................................................................................................................................2 - 56
Low FiO2 Alarm Test........................................................................................................................................................................................ 2 - 56
High FiO2 Alarm Test ......................................................................................................................................................................................2 - 56
Peak Pressure Alarms Test............................................................................................................................................................................. 2 - 57
Minute Volume Alarm Test ...........................................................................................................................................................................2 - 57
Miscellaneous Tests......................................................................................................................................................................... 2 - 58
Test the Line Voltage Alarm..........................................................................................................................................................................2 - 58
Top Light and Auxiliary Light Test..............................................................................................................................................................2 - 58
Touchpad /USB Mouse Test..........................................................................................................................................................................2 - 58
Vaporizer Interlock Test................................................................................................................................................................. 2 - 58
Vaporizer Accuracy Test ................................................................................................................................................................ 2 - 59
Electrical Tests................................................................................................................................................................................... 2 - 60
Auxiliary Electrical Outlet Test..................................................................................................................................................................... 2 - 60
Electrical Safety Inspection Test.................................................................................................................................................................. 2 - 60
Electrical Safety Inspection Form................................................................................................................................................................ 2 - 61
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 - 9
Breathing System Leak Test.............................................................................................................................................................................3 - 9
Check the AG Module Accuracy.................................................................................................................................................................. 3 - 16
Gas Module Verification................................................................................................................................................................................. 3 - 17
Gas Delivery System Tests............................................................................................................................................................................. 3 - 17
Check the Sensor Zero Point........................................................................................................................................................................ 3 - 19
2 046-001141-00 A5/A4/A3™ Service Manual
Table of Contents
Check the Flow Sensor Accuracy................................................................................................................................................................3 - 20
Check the Pressure Sensor Accuracy......................................................................................................................................................... 3 - 25
Check the electronic flowmeter accuracy ............................................................................................................................................... 3 - 29
Pneumatic Leak Tests ..................................................................................................................................................................... 3 - 32
N2O Cylinder Leak Test (A5 and A3 only)................................................................................................................................................ 3 - 32
O2 Cylinder Leak Test......................................................................................................................................................................................3 - 32
AIR Cylinder Leak Test..................................................................................................................................................................................... 3 - 32
Line Pressure Leak Tests................................................................................................................................................................................. 3 - 33
Line Pressure Gauges Accuracy Test.........................................................................................................................................................3 - 34
Breathing System Checks.............................................................................................................................................................. 3 - 35
Waste Gas Scavenger Test (if available) ................................................................................................................................................... 3 - 35
Internal Gas Connections Test..................................................................................................................................................................... 3 - 35
Drive Gas Pressure Loss Alarm, N2O Cutoff Test................................................................................................................................... 3 - 36
Performance Verification............................................................................................................................................................... 3 - 37
Manual Ventilation Test ................................................................................................................................................................................. 3 - 37
Manual Mode Ventilation Test..................................................................................................................................................................... 3 - 37
APNEA Alarm Test ............................................................................................................................................................................................ 3 - 38
Alarm Silence Test............................................................................................................................................................................................ 3 - 38
VCV Adult Ventilation Mode Test ............................................................................................................................................................... 3 - 38
VCV Child Ventilation Mode Test................................................................................................................................................................ 3 - 39
Airway Disconnect Alarm Test.....................................................................................................................................................................3 - 39
PCV Adult Ventilation Mode Test ............................................................................................................................................................... 3 - 40
Pressure Support (PS) Ventilation Mode Test ........................................................................................................................................ 3 - 41
Alarms and Fail safe Functions.................................................................................................................................................... 3 - 42
Set Up....................................................................................................................................................................................................................3 - 42
Low FiO2 Alarm Test........................................................................................................................................................................................ 3 - 42
High FiO2 Alarm Test ......................................................................................................................................................................................3 - 42
Peak Pressure Alarms Test............................................................................................................................................................................. 3 - 43
Minute Volume Alarm Test ...........................................................................................................................................................................3 - 43
Miscellaneous Tests......................................................................................................................................................................... 3 - 44
Test the Line Voltage Alarm..........................................................................................................................................................................3 - 44
Top Light and Auxiliary Light Test..............................................................................................................................................................3 - 44
Touchpad /USB Mouse Test..........................................................................................................................................................................3 - 44
Vaporizer Interlock Test................................................................................................................................................................. 3 - 44
For 2 vaporizer Mount ....................................................................................................................................................................................3 - 44
For 3 vaporizer Mount ....................................................................................................................................................................................3 - 45
Vaporizer Accuracy Test ................................................................................................................................................................ 3 - 46
Electrical Tests................................................................................................................................................................................... 3 - 47
Auxiliary Electrical Outlet Test..................................................................................................................................................................... 3 - 47
Electrical Safety Inspection Test.................................................................................................................................................................. 3 - 47
Electrical Safety Inspection Form................................................................................................................................................................ 3 - 48
Calibration............................................................................................................................................................ 4 - 1
Introduction..........................................................................................................................................................................................4 - 2
Calibration Warnings, Precautions, and Notes......................................................................................................................... 4 - 3
Warnings.................................................................................................................................................................................................................4 - 3
Cautions..................................................................................................................................................................................................................4 - 3
Notes........................................................................................................................................................................................................................4 - 3
System Calibration..............................................................................................................................................................................4 - 5
O2 Sensor Calibration........................................................................................................................................................................................4 - 6
Flow Calibration (User)...................................................................................................................................................................................4 - 15
Flow Calibration (Service)..............................................................................................................................................................................4 - 18
Pressure Calibration (Service) ......................................................................................................................................................................4 - 53
Pressure and Flow Zeroing (Service) .........................................................................................................................................................4 - 70
Electronic Flowmeter Zeroing (user).........................................................................................................................................................4 - 74
Calibrate the AG Module (A5/A4 with Gas Module) ............................................................................................................................ 4 - 78
ORC Calibration.................................................................................................................................................................................................4 - 79
Cylinder Yoke Regulator Calibration.........................................................................................................................................................4 - 85
Adjust the back pressure valve....................................................................................................................................................................4 - 90
A5/A4/A3™ Service Manual 046-001141-00 3
Table of Contents
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 - 3
CPU Board Runtime Alarm ...............................................................................................................................................................................5 - 6
Power Board Runtime Alarm...........................................................................................................................................................................5 - 6
Fresh Flow Sensor Board Alarm .....................................................................................................................................................................5 - 8
Ventilator Control Board Runtime Alarm.................................................................................................................................................5 - 10
Real-time Alarms of External AG Module................................................................................................................................................. 5 - 13
Pneumatic Circuit System Problems......................................................................................................................................... 5 - 17
Tools for on-site Maintenance .....................................................................................................................................................................5 - 17
Gas Supplies and Drive Gas .......................................................................................................................................................................... 5 - 26
Anesthetic Gas Delivery System..................................................................................................................................................................5 - 35
Breathing System ............................................................................................................................................................................................. 5 - 50
Tidal Volume ...................................................................................................................................................................................................... 5 - 64
Sensors and Valves Problems ...................................................................................................................................................... 5 - 67
Correspondence with Pneumatic Circuit Components ..................................................................................................................... 5 - 67
Correspondence with Hardware Components ..................................................................................................................................... 5 - 67
Preparations before Using Diagnostic Tests........................................................................................................................................... 5 - 69
Zero Points of Flow & Pressure Sensors Problems ............................................................................................................................... 5 - 69
Connections and Measurement of the Flow Sensors Problems......................................................................................................5 - 69
Connections and Measurement of the Pressure Sensors Problems..............................................................................................5 - 70
Opening State of the Inspiratory Valve Problems ................................................................................................................................ 5 - 71
Opening States of the PEEP Safety Valve Problems............................................................................................................................. 5 - 72
Opening State of the PEEP Valve Problems............................................................................................................................................5 - 72
Hardware and Electrical Problems............................................................................................................................................. 5 - 73
Software Update and Software Configuration Activation................................................................................................ 5 - 75
Factory Setup .................................................................................................................................................................................... 5 - 79
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 - 9
Disassemble the Work Surface.................................................................................................................................................................... 6 - 20
Disassemble the Display................................................................................................................................................................................6 - 30
Remove the Module Rack Assembly ......................................................................................................................................................... 6 - 38
Remove the Module Rack Fan ..................................................................................................................................................................... 6 - 39
Remove the Panel of Pressure Gauges.....................................................................................................................................................6 - 40
Remove the Auxiliary Gas Outlet Assembly............................................................................................................................................ 6 - 42
Remove the Rotating Block Cover of Breathing Circle........................................................................................................................6 - 43
Remove the AGSS Assembly ........................................................................................................................................................................6 - 43
Disassemble the Base Assembly................................................................................................................................................................. 6 - 44
Disassemble the Breathing System........................................................................................................................................... 6 - 53
Remove the O2 Sensor and Cable..............................................................................................................................................................6 - 53
Remove the Breathing Tubes.......................................................................................................................................................................6 - 54
Remove the Flow Sensor ............................................................................................................................................................................... 6 - 55
Remove the Manual Bag................................................................................................................................................................................ 6 - 56
Remove the Absorbent Canister................................................................................................................................................................. 6 - 56
Remove the CO2 Bypass Assembly............................................................................................................................................................6 - 58
Remove the Patient Circle Assembly.........................................................................................................................................................6 - 60
Remove the Bellows Assembly.................................................................................................................................................................... 6 - 60
Remove the Pop-off Valve Assembly ........................................................................................................................................................ 6 - 61
4 046-001141-00 A5/A4/A3™ Service Manual
Table of Contents
Disassemble the Expiratory/Inspiratory Check Valve Assemblies ..................................................................................................6 - 63
Remove the Water Collection Cup.............................................................................................................................................................6 - 64
Remove the Airway Pressure Gauge ......................................................................................................................................................... 6 - 65
Remove the Bag Arm ...................................................................................................................................................................................... 6 - 65
Remove the Back Upper Cover and Back Lower Cover Assemblies............................................................................................... 6 - 66
Remove the Front Upper Cover, Median Plate and Front Lower Cover Assemblies ...............................................................6 - 68
Disassemble the Automatic/Manual Ventilation Switch Assembly ............................................................................................... 6 - 70
Remove the APL Valve Assembly ............................................................................................................................................................... 6 - 72
Replacement Parts............................................................................................................................................... 7 - 1
Introduction..........................................................................................................................................................................................7 - 2
Ordering Replaceable Parts.............................................................................................................................................................................7 - 2
Diagrams and Tables..........................................................................................................................................................................................7 - 3
Old Version .......................................................................................................................................................................................................................... 24
New Version ........................................................................................................................................................................................................................ 25
Warranty............................................................................................................................................................... 8 - 1
Disclaimers ............................................................................................................................................................................................8 - 2
Manufacturer's Responsibility........................................................................................................................................................8 - 2
Phone Numbers and How to Get Assistance ............................................................................................................................8 - 2
Password................................................................................................................................................................................................8 - 2
A5/A4/A3™ Service Manual 046-001141-00 5
Table of Contents
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6 046-001141-00 A5/A4/A3™ 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.
A5/A4/A3™ Service Manual 046-001141-00 1
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 A5/A4/A3 anesthesia
WARNING: Items can be contaminated due to infectious patients.Wear sterile
WARNING: Obey infection control and safety procedures.Used equipment may
machine 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 A5/A4/A3 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
A5/A4/A3 gas connection fittings.
when performing scheduled periodic maintenance.
2 046-001141-00 A5/A4/A3™ 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 system leak test.
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.
used with the A5/A4/A3 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
CAUTION: The watertrap collects water drops condensed in the sampling tube and
CAUTION: The watertrap has a filter preventing bacterium,vapor and patient
CAUTION: Strong scavenging suction on the AG monitor exhaust port nay change
discharge (ESD). Use ESD precautionary procedures when touching,
removing, or inserting parts or assemblies.
therefore prevents them from entering the AG module.If the collected
water reaches a certain amount, you should drain it to avoid airway
blockage.
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.
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
NOTE: The VT PLUS device in the manual can be replaced by VT650/VT900.
with the factory or with a local authorized distributor to determine the
warranty status of a particular instrument.
See section 9.0 (pg. 9-1) "Appendix".
A5/A4/A3™ Service Manual 046-001141-00 3
Introduction Notes
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4 046-001141-00 A5/A4/A3™ Service Manual
1.0
Theory of Operation
Introduction .................................................................................................................................................................................................1-2
Electrical and Pneumatic Connections ....................................................................................................................................... 1-4
Gas Flow ......................................................................................................................................................................................................1-20
Anesthesia System Components.................................................................................................................................................1-38
The Breathing System......................................................................................................................................................................... 1-41
Ventilator UI...............................................................................................................................................................................................1-46
Ventilator Control and Drive........................................................................................................................................................... 1-46
Ventilator Pneumatic- O2 Drive Gas........................................................................................................................................... 1-77
A5/A4/A3™ Service Manual 046-001141-00 1 - 1
Introduction Theory of Operation
1.1 Introduction
The A5/A4/A3 Anesthesia System is a continuous flow inhalation gas anesthesia system that delivers
anesthetic vapor, and provides for automatic and manual modes of ventilation. It is equipped with a
monitoring system for ventilation, inspired, and expired gas. The A5/A4/A3 is intended for use in
operating rooms. It will be used with O2, N2O, and AIR supplied by a medical gas pipeline system or
by externally mounted gas cylinders. Anesthetic agents can be delivered via vaporizers mounted on
the machine.
Electronic PEEP is available in all ventilation modes. User control over inspiratory flow (Tslope) is
possible in PCV, SIMV, and PS modes. Automatic fresh gas compensation limits the effect on the
patient ventilation from changes in fresh gas flow rate by the operator. The traditional bellows system
is driven by oxygen and makes patient disconnections clearly visible.
The A5/A4/A3 fresh gas dosing subsystem offers the ease of use and features of a traditional
anesthesia system. The dual-flow tubes electronic flowmeter, which includes redundant numerical
readouts, displays the O2, N2O, and Air flows at all times. A knob guard prevents inadvertent
movement of the flow control knobs. Gas supply gauges and auxiliary O2/Air flowmeters with
blended output indicate the gas pipeline supply pressures and gas cylinder pressures. An auxiliary O2
flowmeter is placed at a convenient location for the operator. The O2 flush button is in the traditional
location near the front left corner of the table top.
Safety systems within the A5/A4/A3 work to prevent hypoxic mixtures from being delivered to the
patient. Nitrous oxide will not be delivered unless oxygen pressure is present. A pneumatic safety
system assures that at least 21% O2 is present when setting mixtures of O2 and N2O.
The A5/A4/A3 breathing system is warmed to minimize condensation inside the breathing system
block and to return humid gas to the patient. The breathing system provides easy access to the
Airway Pressure Limiting (APL) valve and breathing bag, and easy viewing of the Airway Pressure
gauge (PAW). The APL valve has a comfortable, single turn knob that provides a clear view of the
manual breathing pressure setting. The absorber assembly incorporates a cam lock device that is
convenient to open and close. CO2 absorbent Pre-paks or loose fill can be used. A water trap that can
be drained is also provided on the absorber assembly.
Two flow sensors in the breathing system measure inspired and expired gases for control and
monitoring. Spirometry is standard on the A5. Inspired oxygen is monitored via a fuel-cell type sensor.
Breathing pressure is also monitored. The breathing system can swivel into position. A test plug, next
to the two main hose connections, allows automated leak testing during startup. The Anesthesia Gas
Scavenging System (AGSS) connections are at the rear of A5/A4/A3.
The A5/A4/A3 is powered by an AC power source. In turn, the A5/A4/A3 power management system
provides DC power for its main system functions while charging its internal battery supply. In case of
AC power failure, the A5/A4/A3 operates on battery power for a minimum of 75 minutes with one (1)
new battery installed (A3) or 150 minutes with two (2) new batteries installed (A5). A recessed main
switch is provided to power the system ON and OFF. Four (4) auxiliary AC outlets on the A5 and three
(3) auxiliary AC outlets on the A3 at the rear of the machine operate independently of the main
switch position.
1 - 2 046-001141-00 A5/A4/A3™ Service Manual
Theory of Operation Introduction
NOTE: The breathing system warmer does not operate when the A5/A4/A3 is
NOTE: If the main switch is set to OFF, the O2 fresh gas flow will not flow.
on battery power.
A5/A4/A3™ Service Manual 046-001141-00 1 - 3
Electrical and Pneumatic Connections Theory of Operation
B3
B1
P8
B8
J9˖Ethernet
P1
P8
B2
P9
J8˖USB
P10
B9/B10/B11:
J1˄Mon Brd˅
J2˄Valve Brd˅
J4˄Valve Brd˅
J8˄Valve Brd˅
J6˄Mon Brd˅
J7˄Mon Brd˅
J5˄Mon Brd˅
J3˄Mon Brd˅
J2
DB50
System
Switch
J4
J1
B14
J3
J7
J8
J9
J10
J11
P12
TFT
15"
LCD
B7
Inverter
B4
P14
O2 Source Switch
Manual/Auto
Switch
Oxygen
sensor
P11
Circuit Switch
CO2 Switch
P13
P5
P2
Lin
Nin
Lout Nout
P6
P3
Lin
Nin
Lout Nout
P7
P4
Lin
Nin
Lout Nout
J1
J3
J1
J2
J3
J1
J1
J2
J4
J5
J6
B5
J1
#1
#3
#2
#15
#18
#14
#17
#16
#5
#5
#5
#5
#5
#5
#5
#6
#6
#6
#6
#6
#6
#6
#6
#6
#6
#7
#8
#8
#8
#9
#6
#13
B6
J4˖RS-232
Pressure Switch
J13
#4
B13
J2
#11
Top lighting Switch
J1
B15
J3
J1
#10
#19
J5
P15
VT PLUS
PF-300
J1 J2
B8˖ USB Interface J8
B12
J2
#2
#5
J12˄Mon Brd˅
#13 #13
P16
1.2 Electrical and Pneumatic Connections
1.2.1 Electrical Connections (A3/A4)
FIGURE 1-1 A3/A4 Electrical Connections
1 - 4 046-001141-00 A5/A4/A3™ Service Manual
Theory of Operation Electrical and Pneumatic Connections
No. Description P/N
B1 Power Board 801-0631-00025-00
B2 Battery Interface Board 801-0631-00109-00
B3 Mother Board 801-0631-00108-00
B4 Warning Light Board 801-0631-00019-00
B5 Indicator Light Board 801-0631-00004-00
B6 Touch Screen Control Board 801-0631-00018-00
B7 Display Interface Board 801-0631-00017-00
801-0633-00004-00
115-052901-00 (A4)
115-056938-00 (A5 EPSON,
New)
B8 CPU Board
B9-11 Ventilator Control Board
B12 Sensor Interface board 801-0631-00089-00 (A3)
B13 Top Lighting Board 801-0631-00039-00
B14 Electronic Flowmeter Assembly 115-046746-00
B15 Aux FlowMeter Lighting Board /
P1 Filter Power 250VAC 15A Panel Mount (0633) 801-0633-00003-00
P2-4 Auxiliary Output Socket 801-0631-00032-00
P5-7 Breaker (3.0A) 801-0631-00031-00
P8 Lithium-ion Battery 115-018012-00
P9 Speaker and Connecting Cable 801-0631-00038-00
P10 Fan 801-0631-00028-00
P11 Drive Gas Assembly
P12 Display Exchange Package 801-0631-00075-00
P13 Circuit Heater 115-034450-00
P14 Solenoid valve assembly 801-0631-00046-00
P15 A5 Calibration set FRU
P16 Touch Screen 801-0631-00014-00
#1 Cable, battery 009-000969-00
#2 Cable, Patient Monitor 009-000971-01
#3 Cable, System Switch 009-001776-00
115-056937-00 (A3 EPSON,
New)
115-056941-00 (A5 DSP,
New)
115-056940-00 (A4 DSP,
New)
801-0631-00027-00
115-058771-00 (DSP)
801-0631-00047-00 (For
software bundle versions
earlier than 02.04.00,
EPSON platform)
115-020937-00(For
software bundle version
02.04.00 and later, EPSON
platform)
115-052762-00 (DSP
platform)
801-0631-00121-00/115062775-00
A5/A4/A3™ Service Manual 046-001141-00 1 - 5
Electrical and Pneumatic Connections Theory of Operation
No. Description P/N
#4 Cable, Indicator 009-000977-00
#5 Cable, Ventilator 009-000979-00
#6 Cable, Breathng System 009-000980-00
#7 Cable, Sodalime Canister Switch Cable 009-000987-00
#8 Cable, Circuit Switch 0621-20-78593
#9 Cable, O2 Pressure Switch 0621-20-69588
#10 Cable, Top Lighting A 009-000982-00
#11 Cable, Lighting Switch 009-000981-00
#12 Cable, AC Power Cable 009-002224-00
#13 Cable, Power, AC Internal 009-000985-01
#14
#15 Cable, Display 009-000973-00
#16 Cable, Touch Screen 009-000978-00
#17 Cable, Alarm 009-000976-00
#18
#19 Cable, Display Lighting 009-000986-00
Cable, Inverter Cable(old)
Cable,LED Backlight Input(new)
Cable, Inverter LED (old)
Cable,Screen Backlight (new)
NOTE: When there is a Screen Backlight Board (See
section 1.6.1.3 (pg. 1-48) "Screen Backlight
Board"), please use the new cable.
009-000988-00 (old)
009-006382-00 (new)
009-000974-00 (old)
009-006731-00 (new)
1 - 6 046-001141-00 A5/A4/A3™ Service Manual
Theory of Operation Electrical and Pneumatic Connections
B3
B1
P11
B8
J9˖
Ethernet
P1
P12
B2
P13
J8˖USB
P14
B9/B10/B11:
J1˄Mon Brd˅
J2˄Valve Brd˅
J4˄Valve Brd˅
J8˄Valve Brd˅
J6˄Mon Brd˅
J7˄Mon Brd˅
J5˄Mon Brd˅
J3˄Mon Brd˅
J2
DB50
System
Switch
J4
J1
B14
J3
J7
J8
J9
J10
J11
P12
TFT
15"
LCD
B7
Inverter
B4
P19
O2 Source Switch
Manual/Auto
Switch
Oxygen
sensor
P16
Circuit Switch
CO2 Switch
P18
J1
J3
J1
J2
J3
J1
J1
J2
J4
J5
P22
J1
#1
#4
#2
#15
#18
#19
#17
#16
#5
#5
#5
#5
#5
#5
#5
#6
#6
#6
#6
#6
#6
#6
#6
#6
#6
#7
#8
#8
#8
#6
B6
J4˖RS-232
Pressure Switch
J13
B13
J2
#11
Top lighting
Switch
J1
B15
J3
J1
#10
#20
J5
P20
VT PLU S
PF-300
J1 J2
B8˖ USB Interface J8
B12
J2
#2
#5
J12˄Mon Brd˅
P21
P7
P3
Lin
Nin
Lout Nout
P8
P4
Lin
Nin
Lout Nout
P9
P5
Lin
Nin
Lout Nout
P10
P6
Lin
Nin
Lout Nout
#13
P2
Lout
Nout
Lin
Nin
#13
#13 #13
Input1 Input2 Input3 Input4
#12
P15
J1
#2
#3
B5
J1
#2
#14
B17
B16
#2
#9
1.2.2 Electrical Connections (A5)
A5/A4/A3™ Service Manual 046-001141-00 1 - 7
FIGURE 1-2 A5 Electrical Connections
Electrical and Pneumatic Connections Theory of Operation
No. Description P/N
B1 Power Board 801-0631-00025-00
B2 Battery Interface Board 801-0631-00109-00
B3 Mother Board 801-0631-00108-00
B4 Warning Light Board 801-0631-00019-00
B5 Indicator Light Board 801-0631-00004-00
B6 Touch Screen Control Board 801-0631-00018-00
B7 Display Interface Board 801-0631-00017-00
801-0631-00026-00 (A5
B8 CPU Board PCBA
B9-11 Ventilator Control Board
B12 Sensor Inter face board
B13 Top Lighting Board 801-0631-00039-00
B14 Electronic flowmeter assembly 115-046746-00
B15 Aux FlowMeter Lighting Board /
B16 Infrared Communication Board 801-0621-00165-00
B17 AG Module 6800-30-50502
P1 Filter Power 250VAC 10A Panel Mount (0631) 801-0631-00029-00
P2 Breaker (10.0A) 801-0631-00030-00
P3-6 Auxiliary Output Socket 801-0631-00032-00
P7-10 Breaker (3.0A) 801-0631-00031-00
P11-12 Lithium-ion Battery 115-018012-00
P13 Speaker and Connecting Cable 801-0631-00038-00
P14 Fan 801-0631-00028-00
P15 Touchpad 801-0631-00052-00
P16 Drive Gas Assembly
P17 Display Exchange Package 801-0631-00075-00
P18 Circuit Heater 801-0631-00069-00
P19 Solenoid valve assembly 801-0631-00046-00
P20 A5 calibration set FRU
P21 Touch Screen 801-0631-00014-00
P22 Fan 024-000407-00
EPSON Platform)
115-052902-00 (A5
DSP platform)
801-0631-00027-00 (A5
EPSON Platform)
115-058771-00
801-0631-00089-00
(EPSON)
801-0631-00047-00
(For software bundle
versions earlier than
02.04.00, EPSON
platform)
115-020937-00(For
software bundle
version 02.04.00 and
later, EPSON platform)
115-052762-00 (DSP
platform)
801-0631-00121-00/
115-062775-00
1 - 8 046-001141-00 A5/A4/A3™ Service Manual
Theory of Operation Electrical and Pneumatic Connections
No. Description P/N
#1 Cable, battery 009-000969-00
#2 Cable, Patient Monitor 009-000971-01
#3 Cable, Touchpad 009-000972-00
#4 Cable, System Switch 009-001776-00
#5 Cable, Ventilator 009-000979-00
#6 Cable, Breathng System 009-000980-00
#7 Cable, Sodalime Canister Switch Cable 009-000987-00
#8 Cable, Circuit Switch 0621-20-78593
#9 Cable, O2 Pressure Switch 0621-20-69588
#10 Cable, Top Lighting A 009-000982-00
#11 Cable, Lighting Switch 009-000981-00
#12 Cable, Auxiliary Outlet 009-000984-00
#13 Cable, Power, AC Internal 009-000985-01
#14 Cable, Indicator 009-000977-00
#15 Cable, Display 009-000973-00
#16 Cable, Touch Screen 009-000978-00
#17 Cable, Alarm 009-000976-00
#18
#19
#20 Cable, Display Lighting 009-000986-00
Cable, Inverter LED (old)
Cable,Screen Backlight(new)
Cable, Inverter Cable(old)
Cable,LED Backlight Input(new)
NOTE: When there is a Screen Backlight Board (See
section 1.6.1.3 (pg. 1-48) "Screen Backlight
Board"), please use the new cable.
009-000974-00 (old)
009-006731-00 (new)
009-000988-00 (old)
009-006382-00 (new)
1.2.3 Pneumatic Connections (A3/A4)
NOTE: This diagram reflects the latest version of the pneumatic connections.
Please refer to label on the back of the service door of the anesthesia
system.
NOTE: The green tube in the tube diagram needs to paste the oxygen label.
NOTE: The orange tube in the tube diagram needs to paste the air label.
NOTE: The blue tube in the tube diagram needs to paste the N2O label.
NOTE: The black tube in the tube diagram needs to paste the neutral label.
A5/A4/A3™ Service Manual 046-001141-00 1 - 9
Electrical and Pneumatic Connections Theory of Operation
FIGURE 1-3 A3 Pneumatic Connections
1 - 10 046-001141-00 A5/A4/A3™ Service Manual
Theory of Operation Electrical and Pneumatic Connections
!
FIGURE 1-4 A4 Pneumatic Connections
A5/A4/A3™ Service Manual 046-001141-00 1 - 11
Electrical and Pneumatic Connections Theory of Operation
S/N From To P/N
25 Total Flow Meter Vaporizer Manifold M6G-020014---
26 Back Pressure Regulator Total Flow Meter M6G-020014---
27 N2O Flow Sensor Gas Mixer M6G-020026---
28 Air Flow Sensor Gas Mixer M6G-020026---
29 O2 Flow Sensor Gas Mixer M6G-020026---
30 Restrictor Assembly ORC Assembly M6G-020026---
31 ORC Assembly Air Flow Sensor M6G-020026---
33 ORC Assembly Y2 M6G-020026---
34 N2O Cylinder Yoke Y1 M6G-020045---
35 Y1 N2O Regulator M6G-020045---
36 Air Cylinder Yoke Y1 M6G-020045---
37 Y1 Air Regulator M6G-020045---
38 Y1 Y1 M6G-020045---
39 O2 Pipeline Pressure Gauge O2 Pipeline Assembly M6G-020046---
40 N2O Pipeline Pressure Gauge N2O Pipeline Assembly M6G-020046---
41 Air Pipeline Pressure Gauge AIR Pipeline Assembly M6G-020046---
42 O2 Regulator Y2 M6G-020026---
43 Y2 System Switch M6G-020026---
44 Y2 O2 Flush Button M6G-020026---
45 System Switch O2 Needle Valve M6G-020026---
46 Y2 ORC Assembly M6G-020026---
47 Y1 O2 Regulator M6G-020045---
48 N2O Regulator ORC Assembly M6G-020046---
49 ORC Assembly N2O Needle Valve M6G-020026---
50 Air Regulator Y2 M6G-020026---
51 Y2 Air Needle Valve M6G-020026---
52 O2 Flush Button Common Gas Outlet M6G-020026---
53 Vaporizer Manifold Common Gas Outlet M6G-020014---
54 Y1 Air Pipeline Assembly M6G-020045---
55 Exhalation Valve Assembly Gas Reservoir M6G-020026---
56 Y2 Y2 M6G-020026---
57 Y2 Auxiliary O2 Assembly M6G-020026---
58
59 Y1 O2 Pipeline Assembly M6G-020045---
60 O2 Cylinder Yoke Y1 M6G-020045---
62 Y1 N2O Pipeline Assembly M6G-020045---
63 Y1 Exhalation Valve Assembly M6G-020045---
64 Auxiliary Air Assembly Y2 M6G-020026---
65 Auxiliary O2 Assembly Y2 M6G-020026---
66 Y2 Auxiliary Gas Outlet M6G-020026---
67 Y2 Auxiliary Air Assembly M6G-020026---
Gas Mixer or Electronic Flowmeter
Assembly
Back Pressure Regulator M6G-020014---
1 - 12 046-001141-00 A5/A4/A3™ Service Manual
Theory of Operation Electrical and Pneumatic Connections
S/N From To P/N
73 O2 Needle Valve Y2 M6G-020026---
74 Y2 Y2 M6G-020026---
75 O2 Poppet Valve Y2 M6G-020026---
76 O2 Poppet Valve Y2 M6G-020026---
77 Y2 O2 Poppet Valve M6G-020026---
78 Y2 O2 Flow Sensor M6G-020026---
79 Y1 O2 Pipeline Assembly M6G-020045---
81 Y1 Y1 M6G-020045---
90 Air Needle Valve Restrictor Assembly M6G-020026---
91 N2O Needle Valve N2O Flow Sensor M6G-020026---
Y1 Three-way Connector 082-000583-00
Y2 Three-way Connector 082-000582-00
1.2.4 Pneumatic Connection (A5)
FIGURE 1-5
NOTE: This diagram reflects the latest version of the pneumatic connections.
Please refer to label on the back of the service door of the anesthesia
system.
NOTE: The green tube in the tube diagram needs to paste the oxygen label.
NOTE: The orange tube in the tube diagram needs to paste the air label.
NOTE: The blue tube in the tube diagram needs to paste the N2O label.
NOTE: The black tube in the tube diagram needs to paste the neutral label.
A5/A4/A3™ Service Manual 046-001141-00 1 - 13
Electrical and Pneumatic Connections Theory of Operation
FIGURE 1-6 A5 Pneumatic Connections (New Version)
1 - 14 046-001141-00 A5/A4/A3™ Service Manual
Theory of Operation Electrical and Pneumatic Connections
S/N From To P/N
25 Total Flow Meter Vaporizer Manifold M6G-020014---
26 Back Pressure Regulator Total Flow Meter M6G-020014---
27 N2O Flow Sensor Gas Mixer M6G-020026---
28 Air Flow Sensor Gas Mixer M6G-020026---
29 O2 Flow Sensor Gas Mixer M6G-020026---
30 ORC Assembly ORC Assembly M6G-020026---
31 Restrictor Assembly Air Flow Sensor M6G-020026---
33 ORC Assembly Y2 M6G-020026---
34 N2O Cylinder Yoke Y1 M6G-020045---
35 Y1 N2O Regulator M6G-020045---
36 Air Cylinder Yoke Y1 M6G-020045---
37 Y1 Air Regulator M6G-020045---
38 Y1 Y1 M6G-020045---
39 O2 Pipeline Pressure Gauge O2 Pipeline Assembly M6G-020046---
40 N2O Pipeline Pressure Gauge N2O Pipeline Assembly M6G-020046---
41 Air Pipeline Pressure Gauge AIR Pipeline Assembly M6G-020046---
42 O2 Regulator Y2 M6G-020026---
43 Y2 System Switch M6G-020026---
44 Y2 O2 Flush Button M6G-020026---
45 System Switch O2 Needle Valve M6G-020026---
46 Y2 ORC Assembly M6G-020026---
47 Y1 O2 Regulator M6G-020045---
48 N2O Regulator ORC Assembly M6G-020046---
49 ORC Assembly N2O Needle Valve M6G-020026---
50 Air Regulator Y2 M6G-020026---
51 Y2 Air Needle Valve M6G-020026---
52 O2 Flush Button Common Gas Outlet M6G-020026---
53 Vaporizer Manifold Common Gas Outlet M6G-020014---
54 Y1 Air Pipeline Assembly M6G-020045---
55 Exhalation Valve Assembly Gas Reservoir M6G-020026---
56 Y2 Y2 M6G-020026---
57 Y2 Auxiliary O2 Assembly M6G-020026---
58
59 Y1 O2 Pipeline Assembly M6G-020045---
60 O2 Cylinder Yoke Y1 M6G-020045---
61 Y1 Y1 M6G-020045---
62 Y1 N2O Pipeline Assembly M6G-020045---
63 Y1 Exhalation Valve Assembly M6G-020045---
64 Auxiliary Air Assembly Y2 M6G-020026---
65 Auxiliary O2 Assembly Y2 M6G-020026---
66 Y2 Auxiliary Gas Outlet M6G-020026---
Gas Mixer or Electronic Flowmeter
Assembly
Back Pressure Regulator M6G-020014---
A5/A4/A3™ Service Manual 046-001141-00 1 - 15
Electrical and Pneumatic Connections Theory of Operation
S/N From To P/N
67 Y2 Auxiliary Air Assembly M6G-020026---
69 Y1 Auxiliary Gas Outlet M6G-020045---
73 O2 Needle Valve Y2 M6G-020026---
74 Y2 Y2 M6G-020026---
75 O2 Poppet Valve Y2 M6G-020026---
76 O2 Poppet Valve Y2 M6G-020026---
77 Y2 O2 Poppet Valve M6G-020026---
78 Y2 O2 Flow Sensor M6G-020026---
79 Y1 O2 Pipeline Assembly M6G-020045---
81 Y1 Y1 M6G-020045---
90 Air Needle Valve Restrictor Assembly M6G-020026---
91 N2O Needle Valve N2O Flow Sensor M6G-020026---
Y1 Three-way Connector 082-000583-00
Y2 Three-way Connector 082-000582-00
1 - 16 046-001141-00 A5/A4/A3™ Service Manual
Theory of Operation Electrical and Pneumatic Connections
1.2.5 Connections Between Pneumatic Circuit, Breathing System and Ventilator Control Board
FIGURE 1-7 Control Board Connections (EPSON Platform)
A5/A4/A3™ Service Manual 046-001141-00 1 - 17
Electrical and Pneumatic Connections Theory of Operation
FIGURE 1-8 Control Board Connections (DSP Platform)
1 - 18 046-001141-00 A5/A4/A3™ Service Manual
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
22
23 Breathing System Connector Exhalation Gas Assembly 115-034448-00
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---
Y1 Two-way Connector \ M02A-10-25945
Y2 Three-way Connector \ M90-100030---
156 Y1 Y1 M6G-020046---
Gas-out Connector of CGO
Connector
Fresh Gas 082-000519-00
A5/A4/A3™ Service Manual 046-001141-00 1 - 19
Gas Flow Theory of Operation
1.3 Gas Flow
1.3.1 Pneumatic Circuit Diagram
FIGURE 1-9 Pneumatic Circuit Diagram
1 - 20 046-001141-00 A5/A4/A3™ Service Manual
Theory of Operation Gas Flow
1.3.2 Parts List
1 O2 Pipeline 30 Auxiliary Air Supply
2 O2 Cylinder 31 Inspiratory Valve
3 N2O Pipeline 32 CO2 Absorber Canister
4 N2O Cylinder 33 Bypass Valve
5 Air Pipeline 34 O2 Sensor
6 Air Cylinder 35 Airway Pressure Gauge
7 Regulator (0.4 MPa) 36 Inspiratory Flow Sensor
8 Pressure Relief Valve 37 Patient
9 Filter 38 Expiratory Flow Sensor
10 Regulator (0.2 MPa) 39 Water Collection Cup
11 Inspiratory Flow Valve 40 Expiratory Valve
12 Flow Sensor 41 Auto/Manual Ventilation Switch
13 Mechanical Overpressure Valve (110 cmH2O) 42 Manual Bag
14 Pop-O ff Valve 4 3 A PL Valve
15 PEEP Safety Valve 44 High Pressure O2 Output
16 Pressure Switch (140 kPa) 45 Bellows Assembly
17 Proportional PEEP Valve 46 Pressure Relief Valve (10 cmH2O)
18 Expiratory Valve 47 Negative Pressure Valve (1 cmH2O
19 Pneumatic Resistor 48 Scavenging Reservoir and Noise Eliminator
20 O2 Flush Valve 49 Pressure Sensor
21 Flow Restrictor 50 Total Flow Meter
22 Pressure Switch 51 Auxiliary O2 Supply
23 Regulator (0.2 MPa) 52 Negative Pressure Valve
24 System Switch 53 Pressure Sensor
25 Oxygen Ratio Controller (ORC) 54 AGSS (AGSS Transfer and Receiving System)
26 Electronic Flowmeter Sensor 55 Check Valve
27 Double-vaporizer Manifold 56 Back Pressure Valve
28 Check Valve 57 Poppet Valve
29 Pressure Relief Valve 58 Needle Valve
59 Adjustable Restrictor
A5/A4/A3™ Service Manual 046-001141-00 1 - 21
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 anesthetic agent delivery device (vaporizer),
breathing system, and anesthetic ventilator; and outputs fresh gas. The following figure shows the
pneumatic circuit of the Anesthetic Gas Delivery System.
Pressure Relief Valve
Flow Control Valve
Flow Restrictor
FIGURE 1-10 Pneumatic Circuit Diagram
1 - 22 046-001141-00 A5/A4/A3™ Service Manual
Theory of Operation Gas Flow
The following picture illustrates how gas supplies are outputted. O2 is divided into four pathways -
system switch (24), O2 flush valve (20), auxiliary O2 supply (51), and high pressure O2 output (44),
respectively. Air enters two pathways - one pathway to the needle valve (58) and the other to the
auxiliary Air supply (3). N2O goes to the ORC (25).
When the system switch (24) is turned on, O2 enters the needle valve (58). When O2 flow is greater
than 300ml, N2O can enter the needle valve (58) through ORC 25. After passing through the needle
valve (58), the pre-set pneumatic resistance (59) controls the O2 and N2O proportions and ensures
the minimum O2 concentration.
FIGURE 1-11 Gas Supply Output
A5/A4/A3™ Service Manual 046-001141-00 1 - 23
Gas Flow Theory of Operation
After passing through the pneumatic resistance (59), O2 and N2O enter the electronic flow sensor
(26). Air enters the electronic flow sensor (26) after passing through the needle valve (58) and the
electronic flow meter monitors, and displays the gas flow.
FIGURE 1-12 Flow Sensor Tubing
The converged gas goes from the total flow meter (50) to the anesthetic agent delivery device
(vaporizer), forming fresh gas after mixed with the anesthetic agent. The fresh gas then goes from the
check valve (28) through the CGO (29) assembly to the breathing system. The flushing O2 also enters
the breathing system through the CGO (29) assembly.
FIGURE 1-13 Outlet/Inlet of Anesthetic Agent Delivery Device
1 - 24 046-001141-00 A5/A4/A3™ Service Manual
Theory of Operation Gas Flow
1.3.4.2 Gas Supplies
FIGURE 1-14 O2 Pipeline Supply Inlet Assembly
The above picture shows the O2 pipeline supply inlet assembly. The anesthesia machine's pneumatic
circuit starts from the gas supplies, which function to introduce the external pipeline or cylinder
gases into the machine. Since the pressure of external gas is very high and the external gas contains
foreign substances, the pressure reducing valves, filters, and pressure relief valves are available in the
supply gas circuit. Also, the check valves are equipped in the supply gas circuit to prevent gas from
flowing back into the pipeline or cylinder.
The anesthesia machine has pipeline and cylinder gas supplies available. Pipeline gas supplies go
into the pipeline gas supply inlet assemblies through pipeline connectors 1, 3, and 5, respectively.
The pipeline pressure ranges between 280 and 600 kPa. Cylinder gas supplies go into the system
through cylinder connectors 2, 4, and 6, respectively. The O2 and Air cylinder pressures are 6.9 to 15
MPa, and the N2O cylinder pressure is 4.2 to 6 MPa, both of which are decreased to 400 kPa through
three regulators (7). Each connector is clearly marked and designed to prevent misconnection. All
connectors have filters and check valves. Color coded gauges show the pipeline and cylinder
pressures. The Pressure Relief Valve (8) functions to prevent the supply gas pressure from being too
high. It releases excess gas when the gas pressure exceeds 758 kPa. Each supply gas is outputted after
gas pressure is decreased below 200 kPa through the regulator (23). The Pressure Switch (22)
monitors the O2 supply pressure. When the O2 supply pressure is less than approximately 220 kPa,
the ventilator gives an alarm indicating O2 supply failure.
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Gas Flow Theory of Operation
1.3.4.3 System Switch Assembly
O2 goes into the system switch (24); and flows into the needle valve. The system switch has an
electrical outlet that controls the power-on status of the system. When the system switch is turned
on, O2 enters the needle valve and the system is powered on simultaneously. The anesthetic
ventilator starts to monitor the status of the system. When the system switch is turned off, O2 cannot
enter the needle valve and the system is powered off.
1.3.4.4 Flow Adjust and Control Assembly
FIGURE 1-15 Flow Adjust and Control Assembly
The Needle Valve (58) controls the gas flows. The ORC (25) controls the proportion between O2 and
N2O, and ensures that the O2 concentration is not less than 25%. Turning the needle valve knob
counterclockwise increases the flow; turning it clockwise decreases the flow.
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Theory of Operation Gas Flow
1.3.4.5 Flow Display Assembly
The electronic flowmeter (26) and total flow meter (50) constitute the flow display assembly. Gases
from the flow adjust and control assembly and mixed gas going through the anesthetic agent
delivery device (vaporizer) are outputted. The electronic flowmeter (26) measures and displays the
flow of each gas. The total flow meter (50) displays the total gas flow.
FIGURE 1-16 Flow Display Assembly
1.3.4.6 O2 Flush Button Assembly
FIGURE 1-17 O2 Flush Button Assembly
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Gas Flow Theory of Operation
The above picture shows the O2 flush button assembly. When the O2 flush valve (20) is depressed, O2
rushes into the pneumatic circuit, which is cut off when this valve is released. The O2 supply gas at 0.2
MPa, after being regulated, goes through the O2 flush valve, the CGO assembly, and into the
breathing system. The O2 flush button assembly is not affected by the system switch. Flushing O2
can be performed as long as O2 supply is normal. The O2 flush valve has a slide valve structure inside
that ensures automatic reset each time the valve is depressed and released via the spring.
1.3.4.7 Vaporizer Manifold
FIGURE 1-18 Vaporizer Manifold
The above picture shows the vaporizer manifold assembly. The anesthetic agent delivery device
(vaporizer) is connected to the anesthetic gas delivery system. The mixed gas of N2O, O2, and Air go
into the device; the fresh gas containing these three gases and anesthetic agent is finally outputted
to the CGO assembly.
Either vaporizer manifold (27) is integrated with a check valve (28) that prevents flushed O2 and fresh
gas from flowing back to the vaporizer. The Selectatec mounting with interlocking function prevents
the user from turning on two vaporizers simultaneously.
1.3.4.8 CGO Assembly
FIGURE 1-19 CGO Assembly
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Theory of Operation Gas Flow
The above picture shows the CGO assembly. The CGO assembly includes a flow restrictor (21) and a
pressure relief valve (29). Flushed O2 and fresh gas that are mixed enter the CGO. The pressure relief
valve (29) at the front restricts the pressure of flushed O2, and also restricts the fresh gas from
exceeding 37.9 kPa.
1.3.4.9 Auxiliary O2 and Air Supply Assembly
The Auxiliary O2 Supply Assembly (51) and Auxiliary Air Supply Assembly (30) control flow by two
needle valves. The individual flows are displayed by glass tube flowmeters. The blended gas is output
through a single barbed fitting to the patient. The flow range adjusted is from 0 to 15 L/min. Turning
the flow control counterclockwise increases the flow; turning it clockwise decreases the flow.
1.3.4.10 High Pressure O2 Output Assembly (A5 Only)
The high pressure O2 output (available on the A5 only) comes from the gas source directly and
provides high pressure O2 for the external ventilation device (jet ventilation devices) without passing
through the pressure regulator. When no external device is connected, the high pressure O2 output
is closed. The maximum flow is greater than 90L/min.
FIGURE 1-20 High Pressure O2 Output Assembly (A5 only)
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Gas Flow Theory of Operation
1.3.4.11 Anesthetic Ventilator
The anesthetic ventilator provides drive gas for the patient to breathe. O2 from the gas supply inlet
assembly enters the anesthetic ventilator and is outputted in three pathways: drive gas entering the
breathing system, drive gas discharged through the AGSS outlet, and drive gas discharged through
the PEEP outlet. The ventilator controls drive gas flow to prevent excessively high pressure inside the
pneumatic circuit from injuring the patient. The following picture shows the gas flow direction and
the components of the anesthetic ventilator.
FIGURE 1-21 Anesthetic Ventilator
The following is the pneumatic circuit diagram of the anesthetic ventilator.
FIGURE 1-22 Anesthetic Ventilator - Pneumatic Circuit Diagram
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Theory of Operation Gas Flow
The proportional electromagnetic valve (11) controls inlet gas flow. The filter (9) filters drive gas again.
The regulator (10) regulates pressure inside the pneumatic circuit. Component 12 is a flow sensor of
differential pressure type that monitors gas flow in the drive gas circuit. The Mechanical overpressure
valve (13) ensures that the pressure in the drive gas circuit does not exceed safe pressure. It releases
excess gas when gas pressure exceeds 11 kPa. Component 18 is the expiratory valve. During
expiration, gas inside the bellows is discharged from this valve.
The PEEP function is performed through the expiratory valve. Component 15 is a low-flow
proportional electromagnetic valve. When it opens, gas is bled from the pneumatic resistor (19),
forming relatively stable pressure in the PEEP branch. Such pressure is exerted on the membrane of
the expiratory valve (18) to form PEEP.
To prevent excessively high pressure inside the pneumatic circuit from injuring the patient and
damaging the equipment, the pressure relief valve (15), which is an electromagnetic on-off valve, is
placed before the gas pathway of the expiratory valve. The "16" component is a pressure switch.
When the drive gas pressure is less than 140 kPa, an alarm is triggered. Component 49 is a pressure
sensor that monitors the pressure at which the expiratory valve is closed. The Pressure relief valve (46)
ensures the tube pressure after the expiratory valve is less than 10 cmH2O.
1.3.4.12 Breathing System
The breathing system provides a closed loop for the anesthetic gas. The expired gas from the patient
can be inspired in the inspiration phase to maintain the temperature and humidity conditions of the
patient's expired gas. During inspiration, the drive gas depresses the bag inside the bellows to force
the inside gas to enter the patient's lung. During expiration, the patient's expired gas goes into the
bag inside the bellows. The CO2 Absorber Canister (32) absorbs CO2 that the patient expires. The
following figure shows the pneumatic circuit of the breathing system.
FIGURE 1-23 Breathing System Circuit Diagram
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Gas Flow Theory of Operation
Mechanical and manual ventilation modes are selected through the Auto/Manual ventilation switch
(41). When the Auto/Manual switch is placed in the Manual position, the operator squeezes the
manual bag (42) to supply gas for the breathing system. The APL valve (43) is used to adjust the
pressure inside the pneumatic circuit in case of manual ventilation. When the Auto/Manual switch is
placed in the Auto position, the A5/A4/A3 starts its ventilator to mechanically assist or replace the
spontaneous breathing of the patient. The ventilator controls the drive gas to depress the folding bag
inside bellows (45) and supply gas for the breathing system according to the selected ventilation
mode.
The breathing system is connected to the anesthesia machine main unit through the circuit adapter.
The breathing system is highly integrated, as its tubes are all internal except the tube connected to
the patient and the O2 cell cable, as shown below.
FIGURE 1-24 Breathing System (Available with the Airway Pressure Limiting Valve)
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Theory of Operation Gas Flow
FIGURE 1-25 Breathing System (Available with the Quick Release APL Valve)
FIGURE 1-26 Absorber Canister
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Gas Flow Theory of Operation
In case of mechanical ventilation, during inspiration, gas flows through the Auto/Manual ventilation
switch (41), BYPASS valve (33) or CO2 absorber canister (32), inspiratory valve (31), O2 sensor (34),
airway pressure gauge (35), and inspiratory flow sensor (36) to the patient.
During expiration, gas flows through the expiratory flow sensor (38), expiratory valve (40), and Auto/
Manual ventilation switch (41) to the folding bag. Airway pressure is monitored by the pressure
sensor (53).
Excess water condensation from the exhaled gas is collected in the water collection cup, located on
the bottom side of the breathing system.
The breathing system is easily disassembled and is autoclavable at 134
1.3.4.13 Anesthetic Gas Scavenging System
The Anesthetic Gas Scavenging System (AGSS) is composed of the AGSS transfer system, the AGSS
receiving system, and the AGSS disposal system. Waste gas goes from the exhaust port of the
anesthesia machine through the AGSS transfer system and the AGSS receiving system to the
hospital's waste gas disposal system (AGSS disposal system), as shown below.
FIGURE 1-27 AGSS Diagram
The following figure shows the operational theory of the AGSS. The throttling holes reduce the effect
of negative pressure at the AGSS outlet onto the flow at the entrance. The float helps the user
determine if the disposal system meets the requirement for the minimum pump rate. The filter
provides for filtering of foreign substances to prevent the disposal system from being occluded. The
gas reservoir is connected to the air through pressure compensation openings. When positive or
negative pressure occurs inside the gas reservoir, gas is inputted or outputted to ensure pressure
balance inside the system.
o
C.(273 oF).
The AGSS transfer system is a clear tube with 30 mm conical connectors at both ends. The inlet of the
transfer system is a female 30 mm conical connector and the outlet a male 30 mm conical connector.
The transfer system is connected to the receiving system through the male 30 mm conical connector.
The receiving system is connected to the receiving hose through the 30 mm connector. The
following picture shows the AGSS structure and the connections between the AGSS transfer system,
receiving system, and disposal system.
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Theory of Operation Gas Flow
FIGURE 1-28 AGSS Transfer System
1.3.4.14 Dynamic Gas Scavenging System
The Dynamic Gas Scavenging System (DGSS) is composed of the DGSS transfer system, the DGSS
receiving system, and the DGSS disposal system. Waste gas goes from the exhaust port of the
anesthesia machine through the DGSS transfer system and the DGSS receiving system to the
hospital's waste gas disposal system (DGSS disposal system), as shown below.
FIGURE 1-29 DGSS Diagram
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Gas Flow Theory of Operation
Rear View
Right View
Top Vie w
I1
I2
I3
I4
I5
I6
I7
I8
FIGURE 1-30 DGSS
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Theory of Operation Gas Flow
PAR T( S) DE SC RI PT ION
I1 Power Supply Port Connects the DGSS to 12 V DC power supply.
I2 Negative Pressure Valve Ensure there is no great negative pressure in the system.
I3 Positive Pressure Valve Ensure there is no great positive pressure in the system. The
positive pressure valve turns on when the pressure exceeds
the setting pressure.
I4 Power Supply Indicator Lit when the power supply is connected. Extinguished when
the power supply is not connected.
I5 Mounting Rail Attachment Allows the DGSS to be mounted on the side rail.
I6 Reservoir Bag The exhaust gases flow to the reservoir bag. The exhaust
gases are evacuated from the reservoir bag when the
pressure is up to a threshold.
I7 Inlet Port Intake for exhaust gases from the breathing system. The
waste gas transfer hose connects the inlet port and the waste
gas scavenging connector (see FIGURE 1-3) to transfer the
exhaust gases.
I8 Exhaust Port Exhaust port to the hospital’s waste gas disposal system.
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Anesthesia System Components Theory of Operation
1.4 Anesthesia System Components
1.4.1 Auxiliary Outlets
The A3 and A4 anesthesia system has three 125V 15A Hospital Grade auxiliary outlets. Each outlet has
one 250V 3A breaker.
FIGURE 1-31 Auxiliary Outlet Diagram for the A3 and A4
The A5 anesthesia system has four 125V 15A Hospital Grade auxiliary outlets. Each outlet has one
250V 3A breaker. Additionally, a main breaker limits the combined current of the four outlets to 10A.
FIGURE 1-32 Auxiliary Outlet Diagram for the A5
1.4.2 Work Light Board
1.4.2.1 Top lighting board
FIGURE 1-33 Top Lighting Board, Top View
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Theory of Operation Anesthesia System Components
FIGURE 1-34 Top Lighting Board, Bottom View
The Flow Meter Lighting Board Interface, J1
PIN NAME FUNCTION
1 12V
2GNDGround
3GNDGround
4 LIGHT_OUT Flow Meter Lighting Control
The 12V Power Supply of the
Flow Meter Lighting Board
Lighting Grade Option Switch Interface, J2
PIN NAME FUNCTION
1 HIGH_BRIGHTNESS High Brightness Grade
2 HIGH_BRIGHTNESS High Brightness Grade
3OFFClose Light Grade
4OFFClose Light Grade
5LOW_BRIGHTNESSLow Brightness Grade
6LOW_BRIGHTNESSLow Brightness Grade
Power Supply Interface, J3
PIN NAME FUNCTION
1 12V
2GNDGround
3 12V_AUX
1.4.2.2 Flow Meter Lighting Board
12V Power Supply of the Top
Lighting Board
The 12V Power Supply of the
Flow Meter Lighting Board
FIGURE 1-35 Flow Meter Lighting Board, Top View
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Anesthesia System Components Theory of Operation
FIGURE 1-36 Flow Meter Lighting Board, Bottom View
Flow Meter Lighting Board Interface, J1
PIN NAME FUNCTION
1 12V 12V Power Supply of the Flow Meter Lighting board
2GND Ground
3GND Ground
4LIGHT_IN Flow Meter Lighting Control Signal
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Theory of Operation The Breathing System
1.5 The Breathing System
1.5.1 Brief Introduction
The A5/A4/A3 Breathing System supports three types of operational modes: mechanical ventilation,
manual ventilation, and standby. These modes allow the operator to apply proper ventilation strategy
based on the patient’s needs.
The types of flow paths through the breathing system vary with the operating mode or status.
1.5.2 Automatic Mode, Inspiration
When the Auto/Manual switch is positioned at Auto, the system closes the manual ventilation path.
Drive gas pushes down on the bellows. Gas flows from the bellows, through the CO2 absorber
canister, and through the inspiratory check valve to the patient.
During inspiration, fresh gas flows into the inspiratory limb, upstream of the inspiratory check valve.
In volume mode, tidal volume is compensated for variations in fresh gas flow to ensure that the
volume delivered to the patient meets the set value.
In pressure mode, the inspiratory pressure is regulated both in gas flow and airway pressure to ensure
the airway pressure is held at the set inspiratory pressure during the patient inspiration.
FIGURE 1-37 Automatic Mode, Inspiration Diagram
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The Breathing System Theory of Operation
1.5.3 Automatic Mode, Expiration
When the Auto/Manual switch is set to Auto, the system closes the manual ventilation path. Drive-
gas flow stops and the exhaust valve opens. Exhaled gas flows from the patient, through the
expiratory check valve, and into the bellows.
Residual drive gas flows out of the bellows dome through the exhaust valve to the scavenging
system (AGSS).
If PEEP is selected, static pressure on the pilot port of the exhaust valve sets the PEEP level.
During exhalation, fresh gas flows backwards through the CO2 absorber into the expiratory limb,
downstream of the expiratory check valve.
FIGURE 1-38 Automatic Mode, Expiration Diagram
1.5.4 Manual Mode, Inspiration
When the Auto/Manual switch is set to Manual, the system closes the Auto ventilation path. Gas
flows from the breathing bag when compressed, through the CO2 absorber canister, into the
breathing circuit, and through the inspiratory check valve to the patient.
During inspiration, fresh gas flows from the machine into the inspiratory limb, upstream of the
inspiratory check valve.
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Theory of Operation The Breathing System
If airway pressure exceeds the set value of the APL Valve, the residual gas will pass through the APL
Valve to the scavenging system (AGSS).
FIGURE 1-39 Manual Mode, Inspiration Diagram
1.5.5 Manual Mode, Expiration
When the Auto/Manual switch is set to Manual, the system closes the Auto ventilation path. Gas
flows from the patient, through the expiratory check valve, and into the breathing bag. During
exhalation, fresh gas enters the Breathing System. Residual fresh gas passes through the APL valve to
the AGSS.
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The Breathing System Theory of Operation
FIGURE 1-40 Manual Mode, Expiration Diagram
1.5.6 Pneumatic PEEP
The PEEP valve regulates the pressure at which the exhaust valve opens. Therefore, if PEEP is selected,
static pressure on the pilot port of the exhalation valve sets the PEEP level during the automatic
ventilation.
1.5.7 Ventilator in Standby
When the anesthesia system is in standby mode, monitoring will be inactive, and automatic
ventilation will be unavailable. The patient should not be ventilated when the system is in standby
mode.
1.5.8 Breathing System Components
1.5.8.1 Ventilation Bellows System
The ventilator's driving system is a flow generator. Driving gas fills the bellows dome to compress the
bellows. The breathing gas is pressed out of the bellows into the patient breathing circuit. The
bellows is refilled with fresh gas and the expired gas from the patient.
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Theory of Operation The Breathing System
1.5.8.2 Manual Breathing Bag
In manual mode, this device acts as a normal breathing bag, enabling the user to ventilate the
patient manually.
1.5.8.3 CO2 Absorber Canister
The sodalime inside the CO2 absorber canister absorbs the carbon dioxide from the exhaled gas. The
CO2 absorber canister accommodates standard sized Pre-paks or loose-fill CO2 absorbent.
1.5.8.4 Inspiratory and Expiratory Valves
To ensure correct gas flow direction to and from the patient, check-valves are integrated in the
inspiratory and expiratory limb of the Breathing System.
1.5.8.5 APL (Airway Pressure Limiting) Valve
In manual mode, the APL Valve acts as a normal spring-loaded pressure relief valve, limiting the
maximum pressure in the Breathing System.
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Ventilator UI Theory of Operation
1.6 Ventilator UI
1.6.1 Display
1.6.1.1 Display Interface Board
FIGURE 1-41 Display Interface Board, Top View
FIGURE 1-42 Display Interface Board, Bottom View
Inverter interface, J1
PIN NAME FUNCTION
1 12V Inverter 12V Power Supply
2 12V Inverter 12V Power Supply
3GND Ground
4GND Ground
5 LCD_EN LCD Backlight Enable
6 LCD_BR LCD Backlight Brightness Control
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Theory of Operation Ventilator UI
Warning Light Board Interface, J2
PIN NAME FUNCTION
1 12V Warning Light Board 12V Power Supply
2GND Ground
3 SDA_CPU CPU Board I2C Data Signal
4 SCL_CPU CPU Board I2C Clock Signal
53_3V 3.3V Power Supply
6GND Ground
Touch Screen Control Board interface, J4
PIN NAME Function
15V 5V Power Supply
2 RXD_TOUCH_PANEL Touch Screen Control Board Serial Port Receive Signal
3 TXD_TOUCH_PANEL Touch Screen Control Board Serial Port Transmit Signal
4GND Ground
Display Control Signal Interface, J5
PIN Name Function
1 LCD_EN LCD Backlight Enable
2 LCD_BR LCD Backlight Brightness Control
3 RXD_TOUCH_PANEL Touch Screen Control Board Serial Port Receive Signal
4 TXD_TOUCH_PANEL Touch Screen Control Board Serial Port Transmit Signal
5GND Ground
6 LED_AC AC Indicator Light Drive Signal
7 LED_BAT Battery Indicator Light Drive Signal
8 SDA_CPU CPU Board I2C Signal
9 SCL_CPU CPU Board I2C Signal
10 RSVD Reserved
11 RSVD Reserved
12 RSVD Reserved
13 RSVD Reserved
14 RSVD Reserved
15 RSVD Reserved
16 12V 12V Power Supply
17 12V 12V Power Supply
18 GND Ground
19 GND Ground
20 GND Ground
1.6.1.2 Backlight Inverter Board
NOTE: System will have a Backlight Inverter Board or a Screen Backlight
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Board.
Ventilator UI Theory of Operation
FIGURE 1-43 Backlight Inverter Board, Top View
FIGURE 1-44 Backlight Inverter Board, Bottom View
Inverter Board Interface, J1
PIN NAME FUNCTION
1GND Ground
2GND Ground
3GND Ground
4 BL_ADJ Display Brightness Control Signal
5BL_ON/OFF Inverter Enable Signal
12V 12V Power Supply
6
12V 12V Power Supply
7
12V 12V Power Supply
8
Inverter Board Interface, J2 and J3
PIN NAME FUNCTION
1 High_Voltage High-Voltage Output of the Inverter
2 Low_Voltage Low-Voltage Output of the Inverter
1.6.1.3 Screen Backlight Board
NOTE: System will have a Backlight Inverter Board or a Screen Backlight
Board.
FIGURE 1-45 Screen Backlight Board, Top View
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Theory of Operation Ventilator UI
FIGURE 1-46 Screen Backlight Board, Bottom View
Screen Backlight Board Interface, J1
PIN NAME FUNCTION
1 VPP 12V Power Supply
2GND Ground
3 BCON Screen Backlight Enable Signal
4 DIMMING Screen Backlight Control Signal
5NC None Connection
Screen Backlight Board Interface, J2
PIN NAME FUNCTION
1GND Ground
2 PWM Screen Backlight Control PWM Signal
3 LED_EN Screen Backlight Enable Signal
4 VPP 12V Power Supply
1.6.1.4 Warning Light Board
FIGURE 1-47 Warning Light Board, Top View
FIGURE 1-48 Warning Light Board, Bottom View
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Ventilator UI Theory of Operation
Warning Light Board Interface, J1
PIN NAME FUNCTION
1 12V 12V Power Supply
2GND Ground
3 MAIN_BRD_SDA CPU Board I2C Data Signal
4 MAIN_BRD_SCL CPU Board I2C Clock Signal
53_3V 3.3V Power Supply
1.6.1.5 Display
The anesthesia system display is a 15-inch, 24-bit, 1024x768 LVDS touch screen. Its LCD backlight
brightness can be adjusted by the inverter.
1.6.1.6 Flow Control Board
FIGURE 1-49 Flow Control Board, Top View
FIGURE 1-50 Flow Control Board, Bottom View
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Theory of Operation Ventilator UI
Flow Control Board Interface, J1
PIN NAME FUNCTION
1 TXD_FLOW_BRD Flow Control Board Serial Port Transmit Signal
2 RXD_FLOW_BRD Flow Control Board Serial Port Receive Signal
3GND Ground
4 12V Flow Control Board 12V Power Supply
1.6.1.7 Indicator Light Board
FIGURE 1-51 Indicator Light Board, Top View
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Ventilator UI Theory of Operation
FIGURE 1-52 Indicator Light Board, Bottom View
Indicator Light Board interface, J1
PIN NAME FUNCTION
1 LED_AC AC Indicator Light Drive Signal
2 LED_BAT Battery Indicator Light Drive Signal
3GND Ground
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Theory of Operation Ventilator UI
1.6.2 CPU Board
FIGURE 1-53 CPU Board, Top View
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Ventilator UI Theory of Operation
FIGURE 1-54 CPU Board, Bottom View
Network Port, J9
PIN NAME FUNCTION
1 TX+ Positive End of Transmit Signal
2 TX- Negative End of Transmit Signal
3 RX+ Positive End of Receive Signal
4 CT1 No Definition
5 CT1 No Definition
6 RX- Negative End of Receive Signal
7 CT2 No Definition
8 CT2 No Definition
USB Interface, J8
PIN NAME FUNCTION
1VCC USB Power Supply
2 DM0 USB Data Signal – (Negative)
3 DP0 USB Data Signal + (Positive)
4GND Ground
5VCC USB Power Supply
6 DM1 USB Data Signal – (Negative)
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Theory of Operation Ventilator UI
PIN NAME FUNCTION
7 DP1 USB Data Signal + (Positive)
8GND Ground
RS-232 Interface, J4
PIN NAME FUNCTION
1 NC No Connection
2 RXD RS-232 Receive Signal
3 TXD RS-232 Transmit Signal
4 NC No Connection
5GND Ground
6 NC No Connection
7 NC No Connection
8 NC No Connection
9 NC No Connection
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Ventilator Control and Drive Theory of Operation
1.7 Ventilator Control and Drive
1.7.1 Mother Board
FIGURE 1-55 Mother Board, Top View
FIGURE 1-56 Mother Board, Bottom View
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Theory of Operation Ventilator Control and Drive
VCM Interface, J1
PIN NAME FUNCTION
1 SAFE_VALVE Pressure Relief Valve Drive Signal
27VIN Inspiration Valve Drive Signal
3INSP_VALVE Inspiration Valve Drive Signal
4 7VIN PEEP Valve Drive Signal
5 PEEP_VALVE PEEP Valve Drive Signal
6SOLENOID_VALVE1Three-way Valve 1
7SOLENOID_VALVE2Three-way Valve 2
8SOLENOID_VALVE3Three-way Valve 3
9SOLENOID_VALVE4Three-way Valve 4
10 PNEUM_PRES_SW Pneumatic Block Pressure Switch Signal
11 NC No Connection
12 NC No Connection
13 O2_PRE_SW O2 Pressure Switch Signal at Gas Supply Inlet
14 MANU_AUTO_SW Auto/Manual Switch Signal
15 GND Ground
16 CO2_BYPASS_SW Circuit CO2 Absorber Canister Signal
17 O2+ O2 Concentration Signal
18 O2- O2 Concentration Signal
19 TXD_AUX_BRD VPM Serial Port Transmit Signal
20 RXD_AUX_BRD VPM Serial Port Receive Signal
21 GND Ground
22 RSVD Reserved
23 RSVD Reserved
24 RSVD Reserved
25 VF Differential Pressure Sensor Flow Signal
26 GND Ground
27 TXD_MON_BRD VCM Serial Port Transmit Signal
28 RXD_MON_BRD VCM Serial Port Receive Signal
29 12V 12V Power Supply
30 GND Ground
31 5V VCM Close Pressure Relief Valve Signal
32 5V 5V Power Supply
33 TXD_CALIBRATE Calibration Serial Port Transmit Signal
34 RXD_CALIBRATE Calibration Serial Port Receive Signal
35 GND Ground
36 12V 12V Power Supply
Pneumatic Assembly Interface, J2
PIN NAME FUNCTION
1 7Vout Pressure Relief Valve Power Supply
2 SAFE_VALVE Pressure Relief Valve Drive Signal
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Ventilator Control and Drive Theory of Operation
PIN NAME FUNCTION
3 7Vout Inspiration Valve Power Supply
4INSP_VALVE Inspiration Valve Drive Signal
5 7Vout PEEP Valve Power Supply
6 PEEP_VALVE PEEP Valve Drive Signal
7 12V Three-way Valve Power Supply
8 SOLENOID_VALVE1 Three-way Valve Drive Signal 1
9 12V Three-way Valve Power Supply
10 SOLENOID_VALVE2 Three-way Valve Drive Signal 2
11 12V Three-way Valve Power Supply
12 SOLENOID_VALVE3 Three-way Valve Drive Signal 3
13 12V Three-way Valve Power Supply
14 SOLENOID_VALVE4 Three-way Valve Drive Signal 4
15 RSVD Reserved
16 RSVD Reserved
17 RSVD Reserved
18 VF Thermal Mass Sensor Flow Sensor
19 12V Sensor Board 12V pPower Supply
20 GND Ground
21 NC No Connection
22 NC No Connection
23 NC No Connection
24 GND Ground
25 O2_PRE_SW O2 Pressure Switch Signal at Gas Supply Inlet
26 GND Ground
27 PNEUM_PRES_SW Pneumatic Block Pressure Switch Signal
28 GND Ground
29 MANU_AUTO_SW Auto/Manual Switch Signal
30 GND Ground
31 CO2_BYPASS_SW Circuit CO2 Absorber Canister Signal
32 GND Ground
33 NC No Connection
34 GND Ground
35 O2+ O2 Concentration Signal
36 O2- Ground
37 LOOP_SW Circuit Switch
38 GND Ground
39 NTC_R11 Signal of Thermistor 1
40 NTC_R12 Signal of Thermistor 2
41 NTC_R21 Signal of Thermistor 1
42 NTC_R22 Signal of Thermistor 2
43 HEA_PWR_15V Heater Drive Voltage Signal
44 HEA_PWR_15V Heater Drive Voltage Signal
45 GND Ground
1 - 58 046-001141-00 A5/A4/A3™ Service Manual
Theory of Operation Ventilator Control and Drive
PIN NAME FUNCTION
46 GND Ground
47 12V Electronic Flowmeter Power Supply
48 GND Ground
49 RXD_FLOW_BRD Electronic Flowmeter Serial Port Receive Signal
50 TXD_FLOW_BRD Electronic Flowmeter Serial Port Transmit Signal
Display Interface, J3
PIN NAME FUNCTION
1LCD_EN Inverter Enable Signal
2 LCD_BR Inverter Brightness Adjustment Signal
3 RXD_TOUCH_PANEL Touch Screen Control Board Serial Port Receive Signal
4 TXD_TOUCH_PANEL Touch Screen Control Board Serial Port Transmit Signal
5 NC No Connection
6 LED_AC AC Indicator Light Drive Signal
7 LED_BAT Battery Indicator Light Drive Signal
8 MAIN_BRD_SDA CPU Board I2C Signal
9 MAIN_BRD_SCL CPU Board I2C Signal
10 NC No Connection
11 NC No Connection
12 NC No Connection
13 NC No Connection
14 NC No Connection
15 NC No Connection
16 12V 12V Power Supply
17 GND Ground
18 GND Ground
19 VCC_LCD
20 VCC_LCD
21 GND Ground
22 GND Ground
23 LVDS_DATA0+ LVDS Data Difference to Positive Signal 0
24 LVDS_DATA0- LVDS Data Difference to Negative Signal 0
25 GND Ground
26 LVDS_DATA1+ LVDS Data Difference to Positive Signal 1
27 LVDS_DATA1- LVDS Data Difference to Negative Signal 1
28 GND Ground
29 LVDS_DATA2+ LVDS Data Difference to Positive Signal 2
30 LVDS_DATA2- LVDS Data Difference to Negative Signal 2
31 GND Ground
32 LVDS_DATA3+ LVDS Data Difference to Positive Signal 3
33 LVDS_DATA3- LVDS Data Difference to Negative Signal 3
Optional Backplane Power Supply or CPU Board Power Supply for
Display
Optional Backplane Power Supply or CPU Board Power Supply for
Display
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Ventilator Control and Drive Theory of Operation
PIN NAME FUNCTION
34 GND Ground
35 LVDS_CLK+ LVDS Clock Difference to Positive Signal
36 LVDS_CLK- LVDS Clock Difference to Negative Signal
37 GND Ground
Infrared Module Rack Interface for Patient Monitor, J4
PIN NAME FUNCTION
1LED_AC AC Indicator Light Drive Signal
2 3V3 3.3V Power Supply
3 12V 12V Power Supply
4 12V 12V Power Supply
5GND Ground
6GND Ground
RXD_Infrared Comm
7
Board
TXD_Infrared Comm
8
Board
9 12V 12V Power Supply
10 Fan_PWM PWM Driver Si gna l for Fan
11 Fan_State State Detection Signal for Fan
12 GND Ground
13 LED_BAT Battery Indicator Light Drive Signal
14 PCON-_NON Power ON/OFF Inverse Phase Signal
15 GND Ground
16 PCON+ Power ON/OFF Circuit 3.3V
17 PCON- Power ON/OFF Signal
18 TOUCHPAD_5V 5V Power Supply
19 TOUCHPAD_GND Ground
20 TOUCHPAD_USB+ TOUCHPAD_USB Difference to Positive Signal
21 TOUCHPAD_USB- TOUCHPAD_USB Difference to Negative Signal
22 12V 12V Power Supply
23 GND Ground
24 RSVD Reserved
25 RSVD Reserved
Infrared Comm Board Serial Port Receive Signal
Infrared Comm Board Serial Port Transmit Signal
Calibration Interface, J5
PIN NAME FUNCTION
1 NC No Connection
2 NC No Connection
3 NC No Connection
4 NC No Connection
5 NC No Connection
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Theory of Operation Ventilator Control and Drive
PIN NAME FUNCTION
6 12V 12V Power Supply
7 RXD_CALIBRATE Calibration Serial Port Receive Signal
8 TXD_CALIBRATE Calibration Serial port Transmit Signal
9GND Ground
Anesthetic Ventilator Cooling Fan Interface, J7
PIN NAME FUNCTION
1 12V3 12V Power Supply
2RSVD Reserved
3 FAN1_STATE Fan Status Signal
4GND Ground
Speaker Interface, J8
PIN NAME FUNCTION
1Speak+ Speaker Positive End
2Speak- Speaker Negative End
Battery Adaptation Board Interface, J9
PIN NAME FUNCTION
1BAT1+ Battery Voltage
2NTC1 Battery Internal Thermistor
3 BC1 Battery In-position Signal
4GND Ground
5BAT2+ Battery Voltage
6NTC2 Battery Internal thermistor
7 BC2 Battery In-position Signal
8GND Ground
Power Board Interface, J10
PIN NAME FUNCTION
1 PLAM Buzzer Drive Signal (drives the buzzer directly)
2 RXD_PWR_BRD Power Board Serial Port (receives signal)
3 LOOP_SW Circuit Switch (reflects if the circuit is in position)
4 TXD_PWR_BRD Power Board Serial Port (transmits signal)
5 NC Power Board Cooling Fan Drive
6GND Ground
7 LED-BAT Battery Status Indicator Light Drive Output
8 LCD_EN Backlight Enable Signal
9 LED-AC AC Status Indicator Light Drive Output
10 LCD_BR Backlight Brightness Control Voltage
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Ventilator Control and Drive Theory of Operation
PIN NAME FUNCTION (Continued)
11 PCON-
12 3.3VBF 3.3V only used for power ON/OFF the machine
13 BAT2+ 2# Battery Input, connect to battery positive end
14 GND Ground
15 BC2F
16 NTC2 2# Lithium-ion Battery Internal Thermistor Signal
17 BAT1+ 1# Battery Input, connect to battery positive end
18 GND Ground
19 BC1F
20 NTC1 1# Lithium-ion Battery Internal Thermistor Signal
21 GND Ground
22 GND Ground
23 HEA_PWR_15V Heat Wire Drive Voltage Output
24 HEA_PWR_15V Heat Wire Drive Voltage Output
25 NTC_R12 Thermistor (for controlling heat wire) Pin 1
26 NTC_R22 Thermistor (for controlling heat wire) Pin 2
27 NTC_R11 Thermistor (for controlling heat wire) Pin 1
28 NTC_R21 Thermistor (for controlling heat wire) Pin 2
29 GND Ground
30 GND Ground
31 3V3 3.3V Supply Voltage Output
32 3V3 3.3V Supply Voltage Output
33 5V 5V Supply Voltage Output
34 GND Ground
35 GND Ground
36 GND Ground
37 NC No Connection
38 GND Ground
39 NC No Connection
40 NC No Connection
41 GND Ground
42 GND Ground
43 12V 12V Power Supply Output
44 GND Ground
45 12V 12V Power Supply Output
46 12V 12V Power Supply Output
47 NC No Connection
48 15V2 15.2V Supply Voltage Output
49 NC No Connection
50 15V2 15.2V Supply Voltage Output
Power ON/OFF Signal, LVTTL Pulse Signal. If this signal is high level, the
system is turned on; if this signal is low level, the system is turned off.
2# Battery Availability Signal. Low level indicates battery available; high
level indicates battery unavailable
1# Battery Availability Signal. Low level indicates battery available; high
level indicates battery unavailable
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Theory of Operation Ventilator Control and Drive
CPU Board Interface, J11
PIN NAME FUNCTION
A1 LCD_VDD LCD Power Supply
A2 GND LCD Ground
A3 NC No Connection
A4 NC No Connection
A5 RSVD Serial Port Transmit Signal
A6 RSVD Serial Port Receive Signal
A7 GND Ground
A8 RSVD Serial Port Transmit Signal
A9 RSVD Serial Port Receive Signal
A10 GND Ground
A11 UIVCC_USB USB Power Supply
A12 TOUCHPAD_USB+ TOUCHPAD_USB Data Signal +
A13 TOUCHPAD_USB- TOUCHPAD_USB Data Signal -
A14 GND Ground
A15 SCL CPU Board I2C Clock
A16 SDA CPU Board I2C Data
A17 GND Ground
A18 NC No Connection
A19 NC No Connection
A20 NC No Connection
A21 NC No Connection
A22 FAN1_STATE Fan Status Detected Signal
A23 NC No Connection
A24 GND Ground
A25 3V3 CPU Board Main Power Supply
A26 3V3 CPU Board main Power Supply
A27 GND Ground
A28 GND Ground
A29 5V CPU Board Interface Chip Power Supply
A30 5V CPU Board Interface Chip Power Supply
A31 GND Ground
A32 GND Ground
B1 NC Not Connected
B2 NC Not Connected
B3 NC Not Connected
B4 SPK_OUT+ Speaker Drive Signal +
B5 SPK_OUT- Speaker Drive Signal -
B6 GND Ground
B7 NC No Connection
B8 NC No Connection
B9 NC No Connection
B10 NC No Connection
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Ventilator Control and Drive Theory of Operation
PIN NAME FUNCTION (Continued)
B11 NC No Connection
B12 GND Ground
B13 TXD_PWR_BRD Power Board Serial Port Transmit Signal
B14 RXD_PWR_BRD Power Board Serial Port Receive Signal
B15 GND Ground
B16 TXD_FLOW_BRD Fresh Flow Sensor Board Serial Port Transmit Signal
B17 RXD_FLOW_BRD Fresh Flow Sensor Board Serial Port Receive Signal
B18 GND Ground
B19 TXD_TOUCH_PANEL Touch Screen Controller Serial Port Transmit Signal
B20 RXD_TOUCH_PANEL Touch Screen Controller Serial Port Receive Signal
B21 RSVD Reserved
B22 RSVD Reserved
B23 GND Ground
B24 NC No Connection
B25 NC No Connection
B26 NC No Connection
B27 GND Ground
B28 NC No Connection
B29 NC No Connection
B30 NC No Connection
B31 NC No Connection
B32 NC No Connection
C1 GND Ground
C2 LVDS-TO0+ LVDS Data Signal
C3 LVDS-TO0- LVDS Data Signal
C4 GND Ground
C5 LVDS-TO1+ LVDS Data Signal
C6 LVDS-TO1- LVDS Data Signal
C7 GND Ground
C8 LVDS-TO2+ LVDS Data Signal
C9 LVDS-TO2- LVDS Data Signal
C10 GND Ground
C11 LVDS-TO3+ LVDS Data Signal
C12 LVDS-TO3- LVDS Data Signal
C13 GND Ground
C14 LVDS-TOC+ LVDS Clock Signal
C15 LVDS-TOC- LVDS Clock Signal
C16 GND Ground
C17 TXD_MON_BRD Ventilator Control Board Serial Port Transmit Signal
C18 RXD_MON_BRD Ventilator Control Board Serial Port Receive Signal
C19 GND Ground
C20 TXD_AUX_BRD Auxiliary Ventilator Control Board Serial Port Transmit Signal
C21 RXD_AUX_BRD Auxiliary Ventilator Control Board Serial Port Receive Signal
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Theory of Operation Ventilator Control and Drive
PIN NAME FUNCTION (Continued)
C22 GND Ground
C23 NC No Connection
C24 NC No Connection
C25 GND Ground
C26 TP_PWR_CTRL Touch Pad Power Supply Control Signal
C27 RSVD Reserved
C28 RSVD Reserved
C29 RSVD Reserved
C30 RSVD Reserved
C31 NC No Connection
C32 NC No Connection
Debugging Power ON/OFF Interface, J12
PIN NAME FUNCTION
1 PCON+ Power ON/OFF Signal
2 PCON- Power ON/OFF Signal
Test Point Definition
DESIGNATOR NAME FUNCTION RANGE (Unit: V)
T1 BAT1 Lithium-ion Battery Voltage 1 Fully charged 12.6±5%
T2 BAT2 Lithium-ion Battery Voltage 2 Fully charged 12.6±5%
T3 LED_BAT Battery Indicator Light Drive Signal
T4 TXD_7024
T5 TXD_TOUCH
T6 RXD_7024
T7 RXD_TOUCH
T8 TXD_33209 VPM Serial Port Transmit Signal
T9 TXD_FLOW
T10 RXD_33209 VPM Serial Port Receive Signal
T11 RXD_FLOW
T12 TXD_POWER
T13 RXD_POWER
T14 5V 5V Power Supply 4.75~5.25
T15 3.3V 3.3V Power Supply 3.135~3.465
Auxiliary Ventilator Control Board
Serial Port Transmit Signal
Touch Screen Controller Serial Port
Transmi t Signal
Auxiliary Ventilator Control Board
Serial Port Receive Signal
Touch Screen Controller Serial Port
Receive Signal
Fresh Flow Sensor Board Serial Port
Transmi t Signal
Fresh Flow Sensor Board Serial Port
Receive Signal
Power Board Serial Port Transmit
Signal
Power Board Serial Port Receive
Signal
With battery: 2.5~3.5;
Without battery: 0~0.4
High level 2.4~5;
Low level 0~0.4
High level 2.4~5;
Low level 0~0.4
High level 2.4~5;
Low level 0~0.4
High level 2.4~5;
Low level 0~0.4
High level 2.4~5;
Low level 0~0.4
High level 2.4~5;
Low level 0~0.4
High level 2.4~5;
Low level 0~0.4
High level 2.4~5;
Low level 0~0.4
High level 2.4~5;
Low level 0~0.4
High level 2.4~5;
Low level 0~0.4
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Ventilator Control and Drive Theory of Operation
DESIGNATOR NAME FUNCTION RANGE (Unit: V)
T16 15V2 15.2V Power Supply 14.44~15.96
T17 12V 12V Power Supply 11.4~12.6
T18 P15V Heater Power Supply 0~15
T19 LED_AC AC Indicator Light Drive Signal
T20 12V1 12V Power Supply 11.4~12.6
T21 12V2 12V Power Supply 11.4~12.6
T22 12V3 12V Power Supply 11.4~12.6
T23 7V 7V Power Supply 6.65~7.35
T24 LCD_EN LCD Backlight Enable Signal
T25 LCD_BR
LCD Back lig ht Brightne ss
Adjustment Signal
With AC: 5~3.5;
Without AC: 0~0.4
High level 3.145~3.465; Low
level 0~0.3
Brightest 0~1.5; least bright
4.75~5.25
1.7.2 Ventilator Control and Drive Board
The monitor subsystem performs pressure and flow detection of the anesthetic ventilator and
anesthetic breathing system, valve control, status monitoring collection, O2 concentration reading,
accuracy monitoring of pressure and flow inside the circuit, and accuracy control of tidal volume. For
EPSON system, the monitor subsystem is composed of four boards: monitor signal detection board,
valve drive board, ventilator sensor interface board, and VPM (auxiliary ventilator control board). For
DSP systems, the monitor subsystem is composed of two boards: monitor signal detection board and
valve drive board.
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Theory of Operation Ventilator Control and Drive
1.7.2.1 Monitor Signal Detection Board
FIGURE 1-57 Monitor Signal Detection Board, Top View
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Ventilator Control and Drive Theory of Operation
FIGURE 1-58 Monitor Signal Detection Board, Bottom View
Monitor Signal Detection Board Communication Interface, J1
PIN NAME FUNCTION
1TXD Serial Port Transmit
2RXD Serial Port Receive
3 12V 12V Power Supply
4GND Ground
5GND Ground
6 12V 12V Power Supply
7 PRST Pressure Relief Valve Control Signal
85V 5V Power Supply
Ventilator Sensor Interface, J3
PIN NAME FUNCTION
1SDA I2C Data Signal
2 SCL I2C Clock Signal
3 VT Thermal Mass Flow Sensor Temperature Signal
4 VF Thermal Mass Flow Sensor Flow Signal
5 12V Sensor Power Supply
6GND Ground
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Theory of Operation Ventilator Control and Drive
VT Calibration Communication Interface, J7
PIN NAME FUNCTION
1 TXD_CALIBRATE Calibration Serial Port Transmit Signal
2 RXD_CALIBRATE Calibration Serial Port Receive Signal
3GND Ground
4 12V 12V Power Supply
Three-way Valve Control Interface, J6
PIN NAME FUNCTION
1 12V Three-way Valve Power Supply
2 SOLENOID_VALVE1 Three-way Valve Control 1
3 12V Three-way Valve Power Supply
4 SOLENOID_VALVE2 Three-way Valve Control 2
5 12V Three-way Valve Power Supply
6 SOLENOID_VALVE3 Three-way Valve Control 3
7 12V Three-way Valve Power Supply
8 SOLENOID_VALVE4 Three-way Valve Control 4
VPM Communication Interface, J5
PIN NAME FUNCTION
1 TXD_AUX_BRD VPM Serial Port Transmit Signal
2 RXD_AUX_BRD VPM Serial Port Receive Signal
3GND Ground
4 12V 12V Power Supply
O2 Cell Detection Interface, J12
PIN NAME FUNCTION
1O2+ O2 Cell +
2O2- O2 Cell -
3GND Ground
Test Point Definition
DESIGNATOR NAME FUNCTION RANGE (unit: V)
T1 O2 O2 Concentration Voltage 0~3.5
T2 PP PEEP Pressure 0.2~4.5
T3 PW Airway Pressure 0.2~4.5
T6 FM Ventilator Flow Detection 0.21~5.25
T8 FE Expiratory Flow Value 0.2~5.5
T9 VAJF3 Offset Voltage 0.602~0.622
T10 10V5 10.5V 10.25~10.75
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Ventilator Control and Drive Theory of Operation
DESIGNATOR NAME FUNCTION RANGE (unit: V)
T11 REF_4V 4.096V Baseline Power Supply 3.096~4.196
T12 1V2 1.2V Baseline Power Supply 1.1~1.3
T13 VADJ_P Offset Voltage 0.602~0.622
T14 FI Inspiratory Flow Value 0.2~5.5
T15 VADJ_FI Offset Voltage 0.602~0.622
T16 TXD1 Serial Port Transmit Signal (to CPU Board) 0~3.3
T17 RXD1 Serial Port Receive Signal (from CPU board) 0~5
T18 TXD2 Serial Port Transmit Signal (for calibration) 0~3.3
T19 RXD2 Serial Port Receive Signal (for calibration) 0~5
T20 VD 7V 6.8~7.6
T21 DVDD 3.3V Digital Voltage 3.15~3.45
T22 AVCC 5V Analog Voltage 4.75~5.25
T23 WDI Watchdog Signal 0~3.3
T24 RST Reset Signal 0~3.3
T25 CLK Clock Signal 0~3.3
T26 SAN1 Signal of Three-way Valve 1 0~12
T27 SAN2 Signal of Three-way Valve 2 0~12
T28 SAN3 Signal of Three-way Valve 3 0~12
T29 SAN4 Signal of Three-way Valve 4 0~12
1.7.2.2 Valve Drive Board
FIGURE 1-59 Valve Drive Board, Top View
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Theory of Operation Ventilator Control and Drive
FIGURE 1-60 Valve Drive Board, Bottom View
Proportional Valve and Pressure Relief Valve Drive Interface, J4
PIN NAME FUNCTION
1 7V Pressure Relief Valve Power Supply
2 SAFE_VALVE Pressure Relief Valve Control Signal
3 7V Inspiration Valve Power Supply
4 INSP_VALVE Inspiration Valve Control Signal
5 7V PEEP Valve Power Supply
6 PEEP_VALVE PEEP Valve Control Signal
Power Supply Interface, J2
PIN NAME FUNCTION
1GND Ground
2GND Ground
3 12V 12V Power Supply
Status Monitor Detection Interface, J8
PIN NAME FUNCTION
1GND Ground
2 PNEUM_PRE_SW Circuit block pressure Switch Signal
3GND Ground
4NC /
5GND Ground
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Ventilator Control and Drive Theory of Operation
PIN NAME FUNCTION
6 QUICK_O2_SW O2 Flushing Pressure Switch Signal
7GND Ground
8 CGO_PRE_SW CGO Switch Signal
9GND Ground
10 O2_PRE_SW O2 Pressure Switch Signal at Gas Supply Inlet
11 GND Ground
12 MANU_AUTO_SW Auto/Manual Switch Signal
Test Point Definition
DESIGNATOR NAME FUNCTION RANGE (unit: V )
T1 K_OUT1 Status Monitor Signal 0~3.45
T2 K_OUT2 Status Monitor Signal 0~3.45
T3 SAFE Pressure Relief Valve Signal 0~7
T4 VOC Reserved DA Output Signal 0~1.2
T5 AD2 Analog Channel Output Signal 0~5
T6 FLOW Inspiration Valve Control Signal 0~7
T7 PEEP PEEP Valve Control Signal 0~7
T8 10V 12V Input Signal 10~14
T9 7V Valve Power Supply 6.65~7.35
T10 SGND Ground 0
1.7.2.3 Sensor Interface Board
FIGURE 1-61 Sensor Interface Board, Top View
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Theory of Operation Ventilator Control and Drive
FIGURE 1-62 Sensor Interface Board, Bottom View
Sensor Interface Board Interface, J2
PIN NAME FUNCTION
1 MON_BRD_SDA VCM I2C Data Signal
2 MON_BRD_SCL VCM I2C Clock Signal
3 VT Thermal Mass Flow Sensor Temperature Signal
4 VF Thermal Mass Flow Sensor Flow Signal
5 12V 12V Power Supply
6GND Ground
Test Point Definition
PIN NAME FUNCTION
TP1 3V3 Test 3.3V Power Supply
TP2 5V Test 5V Power Supply
TP3 5VA Test Analog 5V Power Supply
1.7.3 Battery
1.7.3.1 Battery Power
For A3 and A4 anesthesia system:
Battery: 11.1V, 4.5Ah×1 Lithium-ion battery (sealed)
Battery running time: 75 minutes (new battery)
Battery charge time: 8 hours max from an initial charge of 10%
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Ventilator Control and Drive Theory of Operation
For A5 anesthesia system:
Battery: 11.1V, 4.5Ah×2 Lithium-ion Battery (sealed)
Battery Run Time: 150 minutes (new battery)
Battery Charge Time: 8 hours max from an initial charge of 10%.
1.7.3.2 Battery Adaptation Board
FIGURE 1-63 Battery Adaptation Board, Top View
FIGURE 1-64 Battery Adaptation Board, Bottom View
Battery Interface, J1 and J2
PIN NAME FUNCTION
1 BAT+ Battery+
2 BAT+ Battery+
3 BC Battery In-position Signal
4 BAT- Battery-
5NTC Temperature Signal
6 BAT- Battery-
7 BAT- Battery-
Battery Cable Interface, J3
PIN NAME FUNCTION
1VBAT1 Battery Voltage
2 NTC1 Battery Internal Thermistor
3 BC1 Battery In-position Signal
4GND Ground
5VBAT2 Battery Voltage
6 NTC2 Battery Internal Thermistor
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Theory of Operation Ventilator Control and Drive
PIN NAME FUNCTION
7 BC2 Battery In-position Signal
8GND Ground
1.7.4 Infrared Communication Board
FIGURE 1-65 Infrared Communication Board, Top View
FIGURE 1-66 Infrared Communication Board, Bottom View
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Ventilator Control and Drive Theory of Operation
Power Supply Interface, J2
PIN NAME FUNCTION
1 12V 12V Power Supply
2 12V 12V Power Supply
3GND Ground
4GND Ground
5 VDD 3.3V Power Supply
6 VDD 3.3V Power Supply
7GND Ground
8GND Ground
Coomunication Interface, J4
PIN NAME FUNCTION
1 TXD_Infrared Comm Board Infrared Communication Board Serial Port Transmit Signal
2 RXD_Infrared Comm Board Infrared Communication Board Serial Port Receive Signal
3GND Ground
1.7.5 Breathing System Heater
The anesthesia system heater provides software and hardware dual-protection from overheating. The
heater can switch over its operating mode automatically according to the change in ambient
temperature.
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Theory of Operation Ventilator Pneumatic- O2 Drive Gas
1.8 Ventilator Pneumatic- O2 Drive Gas
1.8.1 Ventilator Pneumatic Drive
Oxygen is the driving gas for the ventilator. In addition to the flow meter block, a high pressure
regulator reduces the supply pressure to 200 kPa (29 psi). This pressure represents the drive gas for
the ventilator.
The drive pressure regulator is placed ahead of the proportional valve that generates the driving gas
flow during the inspiratory phase. This flow fills the bellows dome that surrounds the bellows.
1.8.2 Drive Pressure-High Pressure Regulator (200 kPa, 29 psi)
The drive pressure regulator stabilizes the supply pressure provided to the proportional valve. The
flow generated by the proportional valve is therefore independent of pressure variations at the
supply.
Setting the drive pressure regulator at 200 kPa (29 psi) allows for a maximum inspiratory flow of 110
L/min at the ventilator.
1.8.3 Drive Gas Assembly
The manifold assembly module mainly consists of the inspiratory circuit and PEEP circuit. The
inspiratory circuit goes through the normally closed proportional solenoid valve, which generates a
gas flow of 0 to 110 L/min by the valve drive board. The gas flow of the PEEP circuit goes through the
normally closed proportional solenoid valve, which also generates a gas pressure of 3 to 30 cmH2O
by the valve drive board.
1.8.4 Tube Color Coding
All the pneumatic tubes used in the anesthesia system are color coded for use in the United States
only.
GAS US STANDARD
O2 GREEN
N2O BLUE
AIR ORANGE
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Ventilator Pneumatic- O2 Drive Gas Theory of Operation
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2.0
Installation Guide
Preparation - Additional Material Required..............................................................................................................................2-2
Assembly........................................................................................................................................................................................................2-3
Software and License Key Installation....................................................................................................................................... 2-22
Functional Tests...................................................................................................................................................................................... 2-22
Pneumatic Leak Tests.......................................................................................................................................................................... 2-46
Breathing System Checks ................................................................................................................................................................. 2-49
Performance Verification...................................................................................................................................................................2-50
Alarms and Fail safe Functions...................................................................................................................................................... 2-56
Miscellaneous Tests.............................................................................................................................................................................. 2-58
Vaporizer Interlock Test......................................................................................................................................................................2-58
Vaporizer Accuracy Test.....................................................................................................................................................................2-59
Electrical Tests.......................................................................................................................................................................................... 2-60
A5/A4/A3™ Service Manual 046-001141-00 2 - 1
Preparation - Additional Material Required Installation Guide
2.1 Preparation - Additional Material Required
The following additional material are required before installation. The customer is responsible for
supplying this material. Missing items may result in delays, incomplete installations, and/or additional
service visits.
• Compatible emergency O2, N2O, and AIR cylinders
• Agent vaporizers and key fillers (if not purchased with the anesthesia system)
• Liquid agent medication
• CO2 absorbent Pre-Paks or loose fill
• Active O2, N2O, and AIR lines (280 to 600 kPa (40 to 87 psi))
• Dropdown hoses for ceiling-mounted medical gas utilities that are compatible with quick-
disconnect hoses (if not purchased with the anesthesia system)
2 - 2 046-001141-00 A5/A4/A3™ Service Manual
Installation Guide Assembly
2.2 Assembly
NOTE: The Anesthesia Machine is matched with its Breathing System Block via
calibration of its Flow Sensors. If the Breathing System Block is
removed, ensure that it is reinstalled on its matching Anesthesia
Machine. If a different Breathing System Block is reinstalled, then the
Flow Sensors must be recalibrated.
NOTE: Forward going the breathing system will have a serial number label on
it. On the back of the machine, next to the serial number label, there is a
serial number label of the breathing system that the unit was calibrated
and shipped with.
2.2.1 Unpacking and Setup
1. When the A5/A4/A3 is delivered, IMMEDIATELY inspect the box for any damage.
a. If there is NO damage and ALL tip indicators on the box exterior are intact, then sign and
date the bill of lading or airway bill to indicate safe receipt of the anesthesia system.
b. If there is DAMAGE or ANY of the tip indicators on the box exterior have activated, then
conditionally accept the delivery and clearly describe the damages on the bill of lading or
airway bill. BOTH the carrier and recipient must sign and date the bill of lading or airway bill.
Save all damaged factory packaging until further instructed by Mindray. The receiver should
immediately contact Mindray Customer Service at 877.913.9663 or 650.316.3199.
NOTE: When unpacking the unit, keep as much of the plastic covering on the
unit as possible. When all parts are unpacked, return the packing
material to its original box. Place the smaller box inside the larger box.
2. Cut, remove, and discard the white shipping straps from the box.
FIGURE 2-1
3. Pull the box top straight up off the box and place on the floor near the unit. The box top will be
used later as a ramp when rolling down the A5/A4/A3 onto the floor.
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Assembly Installation Guide
FIGURE 2-2
4. Pull the box straight up and over the unit.
FIGURE 2-3
5. Remove the top foam piece on the A5/A4/A3.
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FIGURE 2-4
6. Cut the plastic tie wrap as shown below. Roll down the plastic bag from the unit.
FIGURE 2-5
7. Using a pair of scissors, cut the plastic wrap from the A5/A4/A3 near the back of the unit, using
care to not scratch or otherwise damage the unit. Remove and discard the plastic wrap. Remove
the empty box on the tray from the unit.
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Assembly Installation Guide
FIGURE 2-6
8. Remove the foam covering up the display and the tray.
FIGURE 2-7
9. After removing the plastic wrap and foam, check that there is a box on the side of the unit, as
shown below.
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FIGURE 2-8
10. At the base of the box platform, remove both sets of orange straps.
FIGURE 2-9
11. Remove the piece of wood at the front of the A5/A4/A3. Then, remove the foam packing
material from around the front of the unit.
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Assembly Installation Guide
FIGURE 2-10
12. Remove the foam packing material from around the back of the unit.
FIGURE 2-11
13. Create a ramp for the unit by placing the top of the container next to the base of the container
as shown. The flat side of the wood should be facing up. The other side of the wood has support
to hold up the ramp. Secure the ramp to the container using the hook-and-loop straps.
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