Maquet Servo-i Service manual (Rev5)
SERVO-i Ventilator System
Service Manual
SERVO-i Ventilator System Important
Notes
1 - 2 Service Manual Revision 05
Important SERVO-i Ventilator System
Contents
1. Important ......................................................................
2. Introduction ..................................................................
3. Description of functions ..............................................
4. Disassembling and assembling ..................................
5. Service procedures ......................................................
1
2
3
4
5
6. Troubleshooting ...........................................................
7. Preventive maintenance ..............................................
8. Index .............................................................................
9. Service Manual revision history ..................................
10. Diagrams ......................................................................
6
7
8
9
10
Revision 05 Service Manual 1 - 3
SERVO-i Ventilator System Important
Important
1
General
• Service documentation for the SERVO-i
Ventilator System consists of:
– User's Manual. The User's Manual is an
indispensable complement to the Service
Manual for proper servicing.
– Service Manual
– Installation Instructions
– Spare Parts information
– Documentation for all optional equipment
included in the SERVO-i System is also
available.
• The SERVO-i Ventilator System is referred to as
the SERVO-i troughout this manual.
• There are two serial number labels on the unit:
– One label is attached to the Patient Unit close
to the supply gas inlets. The serial number
stated on this label is the ID number of the
Patient Unit. The serial number is also stored in
the SW memory as the 'System ID'.
– One label is attached to the rear side of the
User Interface close to the On/Off switch. The
serial number stated on this label is the ID
number of the User Interface.
• System version number can be found in the
Status window on the User Interface. Make sure
that the version of the User's Manual
corresponds to the System version.
Symbols used in this manual
• ESD sensitive components. When
handling ESD-sensitive devices,
established procedures must be
observed to prevent damage.
• Special waste. This product contains
electronic and electrical components.
Discard disposable, replaced and leftover parts in accordance with
appropriate industrial and
environmental standards.
• Recycling. Worn-out batteries must
be recycled or disposed of properly in
accordance with appropriate industrial
and environmental standards.
• With power supply connected to the
SERVO-i, there are energized electrical
components inside the unit. Exercise
extreme caution if power supply
connected and covers are removed.
• When performing service on SERVO-i
systems approved for use in MR
environment, only accessories and
spare parts allowed for use in MR
environment must be used in order to
maintain the systems MR environment
status.
• Technical training. Refers to the
Technical training supplied by
MAQUET.
Text inside a box is used to highlight important
information.
• In addition to the Important information given
here and in the related documents (e.g. in the
User's Manual), always pay attention to
applicable local and national regulations.
• Responsibility for the safe functioning of the
equipment reverts to the owner or user in all
cases in which service or repair has been done
by a non-professional or by persons who are not
employed by or authorized by MAQUET, and
when the equipment is used for other than its
intended purpose.
1 - 4 Service Manual Revision 05
• Service contract. Refers to the
Service contract supplied by
MAQUET.
Installation
• Only personnel trained and authorized
by MAQUET shall be permitted to
install the SERVO-i. The installation
and handing-over procedures are
described in the 'SERVO-i Ventilator
System – Installation Instructions'.
Functional check
• After any installation, maintenance or
service intervention in the SERVO-i,
perform a 'Pre-use check' according
to instructions in the 'SERVO-i
Ventilator System – User's Manual'.
Important SERVO-i Ventilator System
Important
Service
• The SERVO-i must be serviced at
regular intervals by personnel trained
and authorized by MAQUET.
Any maintenance or service must be
noted in a log book provided.
• It is recommended that maintenance
and service is done as a part of a
service contract with MAQUET.
• For functionality enhancement, the latest released
System SW version is always recommended.
• Preventive maintenance must be performed at
least once every year as long as the unit is not
used more than normal. Normal operation is
estimated to correspond to approx. 5.000 hours
of operation. Details are found in this Service
Manual, chapter 'Preventive maintenance'.
• The Battery modules shall be replaced after two
and a half years from their manufacturing date.
• The internal Lithium batteries (on PC 1771 and
PC 1772) shall be replaced every five years.
• Worn-out batteries must be recycled or
disposed of properly in accordance
with appropriate industrial and
environmental standards.
• This product contains electronic and
electrical components. Discard
disposable, replaced and left-over
parts in accordance with appropriate
industrial and environmental standards.
• When working with ESD sensitive
components, always use a grounded
wrist band and a grounded work
surface. Adequate service tools must
always be used.
SERVO-i in MR environment
• SERVO-i systems approved for use in a
Magnetic Resonance (MR) environment
are marked with MR Conditional
stickers.
• When performing service on SERVO-i systems
approved for use in MR environment, only
accessories and spare parts allowed for use in
MR environment must be used in order to
maintain the systems MR environment status.
• For further information regarding SERVO-i in MR
environment, refer to:
– SERVO-i MR Environment Declaration
– SERVO-i, MR Environment kit – Installation
Instructions
– Spare Parts information.
Hazard notices
• Before disassembling or assembling of the
SERVO-i, make sure that the:
– On/Off switch is set to Off.
– Mains power cable is disconnected.
– Gas supply is disconnected (wall and/or
cylinder).
– Battery modules are disconnected.
– Regular cleaning and extended cleaning of the
inspiratory channel are performed. Refer to
instructions in the User's Manual.
• With power supply connected to the
SERVO-i, there are energized electrical
components inside the unit.
All personnel must exercise extreme
caution if fault tracing or adjustments
are performed with power supply connected and
with user interface and patient unit covers
removed.
To the responsible service personnel
• The contents of this document are not binding.
If any significant difference is found between the
product and this document, please contact
MAQUET for further information.
• We reserve the right to modify products without
amending this document or advising the user.
• Only personnel trained and authorized by
MAQUET shall be permitted to perform
installation, service or maintenance of
the SERVO-i. Only MAQUET genuine
spare parts must be used. PC boards
(spare parts) must always be kept in a package
for sensitive electronic devices. MAQUET will not
otherwise assume responsibility for the materials
used, the work performed or any possible
consequences of same.
• The device complies to standards and
requirements as stated in the 'SERVO-i Ventilator
System – User's Manual'.
1
Revision 05 Service Manual 1 - 5
SERVO-i Ventilator System Important
Important
Construction materials
The construction materials used in SERVO-i in %
of the total weight.
Metal – total 77%
• Aluminium 69%
• Steel, zink, brass 8%
Polymeric material – total 9%
• PA (Polyamide)
• POM (Polyoxymethylene)
• SI (Silicone)
• TPE (Thermoplastic elastomer)
• PUR (Polyurethane)
• ABS (Acrylicnitrilebutadienstyrene)
• EPDM (Ethylenepropylenedienemonomer)
• PTFE (Polytetrafluoroethylene)
• FPM (Fluororubber)
• NBR (Nitrilerubber)
• PP (Polypropylene)
• PVC (Polyvinyl chloride)
• PS (Polystyrene)
1
Environmental declaration
Purpose
This environmental declaration is for a SERVO-i
basic unit including the carrier and two batteries.
Letters codes within brackets refers to the
Functional Block Diagram in chapter Diagrams.
Components with special environmental concern
Components listed below shall be disposed of in
accordance with appropriate industrial and
environmental standards.
Printed circuit boards
• PC 1770 Main back-plane
• PC 1771 Control, including Lithium battery (C)
• PC 1772 Monitoring, including Lithium battery (M)
• PC 1775 Plug-and-Play back-plane (P)
• PC 1777 Panel including Backlight Inverter (U)
• PC 1778 DC/DC & Standard connectors (P)
• PC 1780 Pneumatic back-plane (I)
• PC 1781 Pressure transducer, 2 pcs (T)
• PC 1784 Expiratory channel (F)
• PC 1785 Expiratory channel connector (E)
• PC 1789 Remote alarm connector (A)
Other electronics
• TFT assembly including backlight (U)
• Touch screen (glass) (U)
•O2 cell, containing caustic lime and lead (Pb) (I)
•O2 Sensor, containing PC boards (I)
• Gas module Air, containing multiple PC boards (I)
• Gas module O2, containing multiple PC boards (I)
• AC/DC Converter, containing PC boards (P)
• Expiratory cassette (E)
• Expiratory valve coil (E)
• Safety valve pull magnet (I)
• Battery modules Nickel-Metal Hydride
•CO2 Analyzer Module, containing PC boards
• Edi Module, containing PC boards
• Y Sensor Module, containing PC boards
1 - 6 Service Manual Revision 05
Electronics – total 14%
• Battery modules Nickel-Metal Hydride
• Printed circuit boards, cables etc.
Others – very small amounts
• Filter paper of fibre glass
Important SERVO-i Ventilator System
Important
Articles of consumption
1. Bacteria filter
2. Filters for the gas modules
3. Filter for the inspiration pressure transducer
4. Filter for the O2 cell (if applicable)
5. Nozzle units for the gas modules
6. Battery modules
7. Lithium batteries
8. Expiratory cassette
9. Expiratory cassette membrane
10. O2 cell (if applicable)
11. Backlight lamps.
Item 1: Consumption approximately 250 pcs/year.
Items 2 – 5: Changed approx. every 5.000 hours.
Items 6: Changed approx. every 12.500 hours.
Items 7: Changed approx. every 25.000 hours.
Items 8 – 11: Changed when needed.
Articles related to clinical applications, e.g. patient
tubings, Y Sensors and NAVA catheters, not
included in the list above.
Noise level
Less than 50 dBA.
Packing materials
The amounts of packing materials will vary
depending on customer adaptation.
Materials for packing:
• Loading pallet. Fulfils the USA requirements
7 CFR 319.40 May 25’th 1995.
• Corrugated cardboard
• Stretch film of Polyethylene, PE.
• Shock-absorbing material of expanded
polyethylene, EPE, or expanded polypropylene,
EPP.
• Clamps of Polyethylene, PE.
Product End-of-Life
For scrapping information, refer to the document
'SERVO-i Ventilator System – Product End-of-Life
Disassembly Instructions.
1
Power consumption
The power consumption depends on the operating
mode and whether the internal batteries are being
fast or trickle charged.
Mode Fast charging Trickle charging
In operation 70 W 38 W
Standby 65 W 33 W
Off 35 W 6 W
Revision 05 Service Manual 1 - 7
SERVO-i Ventilator System Important
Notes
1
1 - 8 Service Manual Revision 05
SERVO-i Ventilator System Introduction
Only personnel trained and authorized
by MAQUET shall be permitted to
perform installation, service or
maintenance of the SERVO-i.
Make sure to prepare the SERVO-i properly
before disassembling and assembling. Refer to
section 'Hazard notices' in chapter 'Important'.
Any service or maintenance must be noted in a
log book.
After any installation, maintenance or service
intervention in the SERVO-i, perform a 'Pre-use
check'. Refer to the 'SERVO-i Ventilator System –
User's Manual' for details.
This product contains electronic and
electrical components. Discard
disposable, replaced and left-over parts
in accordance with appropriate
industrial and environmental standards.
2. Introduction
Main units ......................................................... 2 - 2
User Interface ................................................ 2 - 4
Patient Unit .................................................... 2 - 6
SERVO-i software structure.............................. 2 - 9
General........................................................... 2 - 9
Breathing ....................................................... 2 - 9
Monitoring ...................................................... 2 - 9
Panel .............................................................. 2 - 10
System ID ...................................................... 2 - 10
Edi ................................................................. 2 - 10
2
Revision 05 Service Manual 2 - 1
Introduction SERVO-i Ventilator System
Main units
The SERVO-i is available in different main
configurations:
• Adult
User Interface
2
Patient Unit
SERVO-i
Mobile Cart
• Infant
• Universal Basic edition
• Universal Extended edition
These main configurations are as standard equipped
with a number of ventilation modes suitable for each
patient category. Further ventilation modes can be
installed via SW Upgrades.
The SERVO-i can be divided into the following main
units:
• User Interface. The User Interface contains all
controls used to set the ventilation and monitoring
parameters. Ventilation parameters as well as other
important information are shown on the User
Interface display.
• Patient Unit. The Patient Unit contains pneumatics
and electronics for gas supply to the patient.
Power supply and battery backup is also contained
in the Patient Unit.
The Control cable connects the User Interface and
the Patient Unit.
The SERVO-i shown in the illustration is mounted
onto the optional SERVO-i Mobile cart.
A number of optional equipment can be added to the
SERVO-i Ventilator System. For further information,
refer to the documents listed below.
Aeroneb Pro and Aeroneb Solo
• Aeroneb Pro – Instruction Manual
• Aeroneb Solo – Instruction Manual
• Aeroneb Pro / Aeroneb Solo – Installation Instructions
Alarm output connector
• SERVO-i – User's Manual
• Alarm output connector – Installation Instructions
• Alarm output connector – Reference Manual
Battery module
• SERVO-i – User's Manual
• Battery module – Installation Instructions
2 - 2 Service Manual Revision 05
SERVO-i Ventilator System Introduction
Compressor Mini
• SERVO-i – User's Manual
• Compressor Mini – Operating Manual
• Compressor Mini – Service Manual
• Compressor Mini – Installation Instructions
CO2 Analyzer Module
• SERVO-i – User's Manual
•CO2 Analyzer Module, SERVO-i – Installation
Instructions
Edi Module (NAVA)
• NAVA Ventilation – User's Manual
• Edi Module – Installation Instructions
Gas cylinder restrainer
• SERVO-i – User's Manual
• Gas cylinder restrainer – Installation Instructions
Gas trolley
• SERVO-i – User's Manual
• Gas trolley – Installation Instructions
Heliox
• SERVO-i – User's Manual
• Heliox Adapter kit – Installation Instructions
Holder
• SERVO-i – User's Manual
• SERVO-i Holder – Installation Instructions
Note: MR Environment considerations.
Humidifier and Humidifier Holders
• SERVO-i – User's Manual
• Humidifier – Operating Manual
• Humidifier Holder – Installation Instructions
Loudspeaker booster kit
• Loudspeaker booster kit – Installation Instructions
Mobile cart
• SERVO-i – User's Manual
• SERVO-i Mobile cart – Installation Instructions
Note: MR Environment considerations.
MR Environment kit
• MR Environment declaration
• MR Environment kit – Installation Instructions
Servo Ultra Nebulizer
• SERVO-i – User's Manual
• SERVO Ultra Nebulizer, SERVO-i – Installation
Instructions
Shelf base
• SERVO-i – User's Manual
• SERVO-i Shelf base – Installation Instructions
Note: MR Environment considerations.
Support Arm 176/177
• SERVO-i – User's Manual
• Support Arm 176/177 – Installation Instructions
User Interface panel cover
• SERVO-i – User's Manual
• User Interface panel cover – Installation
Instructions
Y Sensor Measuring
• SERVO-i – User's Manual
• Y Sensor Module – Installation Instructions
2
Interhospital transport kit
• Interhospital transport kit – Interhospital transport
declaration
• Interhospital transport kit – Installation Instructions
Isolation shield with drip guard
• Isolation shield with drip guard – Installation
Instructions
IV Pole
• SERVO-i – User's Manual
• IV Pole, SERVO-i – Installation Instructions
Revision 05 Service Manual 2 - 3
Introduction SERVO-i Ventilator System
2
SVX9011
User Interface
The User Interface can be mounted onto the Mobile
cart but can also easily be removed from the cart
and mounted on the bed post or table/shelf.
The User Interface can be rotated and tilted into a
suitable position. Locking levers, mounting devices
and some other items are shown in the illustration
above.
1. Display with touch screen.
2. Fixed keys for immediate access to special
windows.
3. Main rotary dial.
4. Special function keys.
5. Direct access knobs.
6. Mains indicator (green).
7. Standby indicator (yellow).
8. Start/Stop (Standby) ventilation key.
9. Luminescence detector, adjusts display
brightness automatically. On User Interface of
Type 1, the detector is placed in the upper left
corner. On User Interface of Type 2, the detector
is placed above the Fixed keys in the upper right
corner.
10. Loudspeaker grid.
11. Cable reel.
12. PC Card slot with slot cover.
13. Control cable between User Interface and
Patient Unit.
14. Service connector.
15. On/Off switch and switch cover, version
discontinued in production Q2 2007.
16. On/Off switch and switch cover, version
introduced in production Q2 2007.
17. Panel holder
18. Locking screw, alternative mounting
19. Locking arm, rotation
20. Locking arm, tilting.
21. Serial number label. The serial number stated on
this label is the ID number of the User Interface.
This serial number must always be refered to
when ordering service, spare parts, etc for the
User Interface.
For further information regarding operation of the
User Interface, refer to the User's Manual.
2 - 4 Service Manual Revision 05
SERVO-i Ventilator System Introduction
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SVX9013
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SVX9012
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When the front panel section is removed from the
rear cover, the following parts are accessible:
1. Touch screen including frame.
2. TFT Display.
3. Backlight lamps.
4. PC board Backlight inverter.
5. PC 1777 Panel including PC Card slot.
6. Loudspeaker.
7. Main rotary dial (rotary encoder with switch).
8. Direct access controls (rotary encoder).
The illustration above shows User Interface of Type 2.
Revision 05 Service Manual 2 - 5
Introduction SERVO-i Ventilator System
2
SVX9014
Patient Unit
The Patient Unit can be rotated on and pulled out of
the SERVO-i Mobile cart. It can also be mounted
onto a SERVO-i Holder or a SERVO-i Shelf base.
Items accessible from the outside of the Patient Unit
are shown in the illustration above.
1. Handle.
2. Gas inlet for Air. The gas inlet for Air can also be
used for the optional Heliox adapter.
3. Gas inlet for O2.
4. Equipotentiality terminal.
5. Mains supply connector incl. fuses F11 and F12.
6. Internal fan with filter.
7. Connector for external +12V DC battery power
supply.
8. Fuse F1 for external +12V DC power supply.
9. Optional connector.
10. Control cable connector.
11. Serial port for data communication (RS- 232).
12. Expiratory outlet.
13. Inspiratory section cover.
14. Expiratory inlet.
15. Module unit with six slots for connecting optional
modules, i.e. Battery modules, CO2 Analyzer
Module, Edi Module and Y Sensor Module.
16. Connector for Servo Ultra Nebulizer, SERVO-i.
17. Inspiratory outlet.
18. Alarm output connector (optional).
19. Serial number label. The serial number stated on
this label is the ID number of the Patient Unit.
The serial number is also stored in the SW
memory as the 'System ID'. This serial number
must always be refered to when ordering service,
spare parts, software updates/upgrades, etc.
2 - 6 Service Manual Revision 05
SERVO-i Ventilator System Introduction
as d f l;
When the Patient Unit front cover is removed, the
following parts are accessible:
1. PC 1772 Monitoring.
2. PC 1771 Control.
3. PC 1784 Expiratory channel with the two
connected PC 1781 Inspiratory and Expiratory
Pressure Transducers.
4. Expiratory valve coil.
5. Module unit including PC 1775 Plug-and-play
back-plane.
6. AC/DC Converter.
7. Internal fan.
8. Mains supply inlet.
9. PC 1778 DC/DC & Standard connectors.
10. PC 1785 Expiratory channel connector.
11. PC 1789 Remote alarm connector (optional,
not shown in the illustration).
2
SVX9045
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DS
SVX9084
12. The PC boards, as listed above are directly or
indirectly connected to the PC 1770 Main backplane.
13. The gas modules, the O2 Sensor/cell and the
safety valve pull magnet are connected to the
PC 1780 Pneumatic back-plane.
Revision 05 Service Manual 2 - 7
Introduction SERVO-i Ventilator System
2
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SVX9124
21
20
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The upper part of the Patient Unit contains the
inspiratory section and the expiratory section.
The main parts of the inspiratory section are the:
14. Two gas modules, Air and O2, for regulation of
the inspiratory gas.
15. Connector muff.
16. Inspiratory pipe with housings for the O2 Sensor/
cell and for the safety valve.
17. O2 cell incl. bacteria filter.
18. O2 Sensor. Alternative to the O2 cell for oxygen
concentration measurement.
19. Safety valve.
20. Temperature sensor (inside the connector).
21. Inspiratory pressure transducer tube incl. bacteria
filter, to connect the inspiratory pressure
transducer.
SVX9122
22
:
;
The expiratory cassette (22) is a complete unit.
It contains the following parts:
• Expiratory inlet with moisture trap.
• PC 1786 Expiratory channel cassette.
• Ultrasonic flowmeter.
• Heating foil to keep a stable temperature in the
expiratory gas.
• Pressure transducer connection, incl. bacteria
filter, to connect the expiratory pressure
transducer.
• Expiratory valve incl. valve membrane.
• Expiratory one-way valve.
The expiratory valve coil, mounted under the
expiratory cassette compartment, controls the valve
membrane in the cassette.
PC 1786 Expiratory channel cassette inside the
expiratory cassette is electrically connected to
PC 1784 Expiratory channel via PC 1785 Expiratory
channel connector (10).
SVX9123 SVX9120
2 - 8 Service Manual Revision 05
SERVO-i Ventilator System Introduction
SERVO-i software structure
PC1777 PANEL
PANEL SW
General
The SERVO-i SW installed in the ventilator will
contain all available system functionality. The
software is separated into different subsystems and
stored on some of the PC boards. The separation of
the software is handled by the installation program.
The SERVO-i SW is divided into the following
software subsystems:
• Breathing
• Monitoring
• Panel
• System ID
• Edi
Breathing
The Breathing SW controls the delivery of gases to
the patient. This subsystem is responsible for the
breathing system, that is:
• Ventilation control and regulation
• Inspiratory channel
• Expiratory channel
• Nebulizer control (software option)
The Breathing SW is stored on PC 1771 Control and
PC 1784 Expiratory Channel. The software must be
re-installed if PC 1771 or PC 1784 is replaced. New
software can be installed via a SW Service Release.
The Breathing SW is executed by microprocessors
on PC 1771 and PC 1784.
2
Monitoring
PC1784
PC1771
PC1772
BREATHING
SW
MONITORING
SW
SYSTEM ID
PC1770
Edi
Edi SW
SVX9143
Revision 05 Service Manual 2 - 9
SW
The Monitoring SW controls all monitoring and alarm
functions in the system, including trends of
measured values. Events, such as alarms and
change of settings will also be logged.
The Monitoring SW is stored on PC 1772 Monitoring.
The software must be re-installed if PC 1772 is
replaced. SW related to Monitoring is also stored in
the O2 Sensor. New software can be installed via a
SW Service Release.
The Monitoring SW is executed by the
microprocessor on PC 1772.
Introduction SERVO-i Ventilator System
Panel
The Panel SW controls all user interaction, as well as
software updating to all subsystems via the PC Card
interface.
The Panel SW is stored on PC 1777 Panel. The
software must be re-installed if PC 1777 is replaced.
New software can be installed via a SW Service
Release.
2
The Panel SW is executed by the microprocessor on
PC 1777.
System ID
The System ID SW is a configuration file, stored on
PC 1770 Main back-plane, that is unique for each
ventilator. The System ID SW will enable the
functions selected for this ventilator.
To change the functions of the ventilator, a new
System ID SW can be installed via an Option
Upgrade.
When replacing PC 1770 Main back-plane, a spare
part that is factory programmed for the concerned
ventilator must be used.
Edi
The Edi SW processes and filters the signals from the
Edi Catheter, and transmits Edi and leads data to the
ventilator.
The Edi SW is stored on PC 1874 Edi Module. New
software can be installed via a SW Service Release.
If an Edi Module is part of the system, make sure that
this module is connected during software installation.
The Edi SW is executed by the microprocessor on
PC 1874.
2 - 10 Service Manual Revision 05
SERVO-i Ventilator System Description of functions
Only personnel trained and authorized
by MAQUET shall be permitted to
perform installation, service or
maintenance of the SERVO-i.
Make sure to prepare the SERVO-i properly
before disassembling and assembling. Refer to
section 'Hazard notices' in chapter 'Important'.
Any service or maintenance must be noted in a
log book.
After any installation, maintenance or service
intervention in the SERVO-i, perform a 'Pre-use
check'. Refer to the 'SERVO-i Ventilator System –
User's Manual' for details.
This product contains electronic and
electrical components. Discard
disposable, replaced and left-over parts
in accordance with appropriate
industrial and environmental standards.
3. Description of functions
About this chapter ............................................ 3 - 2
Memory types used in the SERVO-i ................. 3 - 2
User Interface ................................................... 3 - 2
User Interface controls .................................. 3 - 2
PC 1777 Panel ............................................... 3 - 2
Loudspeaker .................................................. 3 - 2
Backlight Inverter ........................................... 3 - 3
Touch screen including frame ....................... 3 - 3
TFT Display with Backlight ............................ 3 - 3
Patient unit ........................................................ 3 - 3
Inspiratory section ......................................... 3 - 3
Expiratory section .......................................... 3 - 6
PC 1770 Main back-plane ............................. 3 - 8
Pressure transducers..................................... 3 - 8
PC 1771 Control ............................................ 3 - 8
PC 1772 Monitoring ....................................... 3 - 9
PC 1784 Expiratory Channel ......................... 3 - 9
Power supply ................................................. 3 - 9
Module unit .................................................... 3 - 10
Internal fan ..................................................... 3 - 11
Optional PC board slots ................................ 3 - 11
Battery module .............................................. 3 - 11
Control cable .................................................... 3 - 11
Optional equipment .......................................... 3 - 12
Aeroneb Pro and Aeroneb Solo ..................... 3 - 12
Alarm output connector ................................. 3 - 12
Battery module .............................................. 3 - 12
Compressor Mini ........................................... 3 - 12
CO2 Analyzer module ..................................... 3 - 12
Edi Module (NAVA) ........................................ 3 - 13
Gas cylinder restrainer ................................... 3 - 13
Gas trolley ...................................................... 3 - 13
Heliox ............................................................. 3 - 13
Holder ............................................................ 3 - 13
Humidifier and Humidifier Holder .................. 3 - 14
Interhospital transport kit .............................. 3 - 14
Isolation shield with drip guard...................... 3 - 14
IV Pole ............................................................ 3 - 14
Loudspeaker booster kit ................................ 3 - 14
Mobile cart ..................................................... 3 - 14
MR Environment kit ....................................... 3 - 14
Servo Ultra Nebulizer ..................................... 3 - 14
Shelf base ...................................................... 3 - 15
Support Arm 176 and Support Arm 177........ 3 - 15
User Interface panel cover ............................ 3 - 15
Y Sensor Measuring ...................................... 3 - 15
3
Revision 05 Service Manual 3 - 1
Description of functions SERVO-i Ventilator System
About this chapter
This text refers to the Functional Main Blocks
diagram in chapter 'Diagrams'.
Memory types used in SERVO-i
There are four different types of memories used in
the SERVO-i:
• Flash memory. For System SW storage. Present on
PC 1771, PC 1772, PC 1777, PC 1784 and in the
O2 Sensor and the Edi Module. The System SW
can be re-installed/updated using a SW Service
Release.
• RAM. For temporary storage of software and data.
3
Present on PC 1771, PC 1772 and PC 1777 and in
the CO2 Module, Edi Module and Y Sensor Module.
• Non-volatile memory. RAM with battery backup.
For settings, trends and logs. Present on PC 1771
and PC 1772.
• EEPROM. For PC board information, configuration,
calibration data, etc. Present on almost all PC
boards and in the O2 cell, CO2 Module, Edi Module
and Y Sensor Module. In the O2 Sensor, an
EEPROM is emulated by the Flash memory.
User Interface
Functional Main Blocks diagram marking: 'U'.
There are two different versions of the User
Interface. In this manual, they are described as:
• Type 1 – Up to User Interface S/N 114000
(SERVO-i S/N 17000).
• Type 2 – User Interface S/N 114001
(SERVO-i S/N 17001) and higher.
There is no difference in the clinical operation
between the two versions, but the electronics inside
the User Interface differs. As a consequence, some
of the spare parts are not compatible between the
two versions. Further information can be found
below and also in the SERVO-i Spare Parts List.
User Interface controls
Setting of different parameter input values is made
with the help of the following different interface
devices:
• Main Rotary Dial (rotary encoder with switch).
• Direct Access Knob, 4 each (rotary encoders).
• Membrane buttons. Integrated parts of the Touch
screen assembly.
• Touch screen.
PC 1777 Panel
Some features included on PC 1777 Panel are:
• SIMM (Single In-line Memory Module) mounted on
its connector P77. Memory type: SDRAM
• PC Card Slot intended for connection/insert of a
PC Card. PC Cards are used to:
– Download software into the different flash
memories situated on PC-boards marked µP and
into the EEPROM on PC 1770 Main back-plane.
– Transfer patient and system data for further
transfer to a computer.
– Service purpose.
• Microprocessor µP on this board includes control
of the functions of the User Interface.
• ID-PROM: The ID information can be read by the
SERVO-i.
• On/Off switch: Switch to Power up or Power down
the SERVO-i. Refer to section 'Power supply'.
A new design of the On/Off switch and the switch
cover was introduced Q2 2007. Refer to chapter
'Disassembling and assembling' for further
information.
• Service connector (P86): Ethernet port for MCare
Remote Services.
• Microphone used to monitor of sounds from the
Loudspeaker.
There are two different versions of PC 1777, Type 1
and Type 2. The PC 1777 spare part is not
compatible between the two versions.
For PC 1777 of Type 2, System SW version V2.00.04
or higher is required.
Note: The System SW must be re-installed if
PC 1777 is replaced.
Note: MR Environment considerations.
Loudspeaker
For generation of sound, e.g. alarm. Connected to
P72 on PC 1777 Panel.
The loudspeaker generates different tones with
individual sound volumes. At startup and during Preuse check the function of the loudspeaker is
monitored by the microphone on PC 1777. During
operation it is continuously monitored through
current sensing.
With the optional accessory 'Loudspeaker booster
kit', the alarm sound is amplified. Refer to section
Optional equipment.
3 - 2 Service Manual Revision 05
SERVO-i Ventilator System Description of functions
Backlight Inverter
PC board with driving stage for backlight (lamps)
mounted behind the TFT Display. The supply voltage
delivered by the Backlight Inverter is 660 V.
The Backlight Inverter is connected to P73 on
PC 1777 Panel.
There are two different versions of the Backlight
Inverter, Type 1 and Type 2. The Backlight Inverter
spare part is not compatible between the two
versions.
Touch screen including frame
The Touch screen implies the touch function of the
front panel screen and is interactive with information
displayed on the TFT Display. The front panel frame
with the touch screen, membrane buttons and DIM
sensor forms the assembly Touch screen including
frame and must be handled as one complete part.
The DIM sensor measures the ambient light and the
screen brightness is automatically adjusted.
There are two different versions of the Touch screen
including frame, Type 1 and Type 2. The Touch
screen including frame spare part is not compatible
between the two versions.
Patient unit
Inspiratory section
Functional Main Blocks diagram marking: 'I'
The main block Inspiratory Section conveys the
breathing gas from its gas inlets for Air and O
supply to the patient breathing system. It comprises
the following main functions:
• Gas Modules – Air and O2. The Air Gas Module can
also be used for Heliox (HeO2), refer to section
'Heliox' below in this chapter.
• Connector Muff.
• Inspiratory Pipe.
•O2 Sensor/cell.
• Temperature Sensor.
• Inspiratory Pressure Tube.
• Safety Valve incl. pull magnet.
• Inspiratory Outlet.
• PC 1780 Pneumatic back-plane.
Gas modules – Air and O
The Air and O2 Gas Modules regulates the inspiratory
gas flow and gas mixture.
2
2
3
TFT Display with Backlight
The TFT Display is a Thin Film Transistor Screen for
color display of picture- and alphanumeric data.
There are two different versions of the TFT Display:
• Type 1 with Backlight consisting of two separate
fluorescent lamps mounted behind the TFT Screen.
• Type 2 with Backlight consists of one fluorescent
lamp mounted behind the TFT Screen.
The TFT Display spare part is not compatible
between the two versions.
The Backlight lamps are driven from the Backlight
Inverter. Estimated lifetime (with acceptable
brightness level) for the lamps is 30.000 hours.
Using the Field Service System (FSS), a time meter
for the lamps can be shown. The time meter must be
reset after replacement of the lamps.
Note: MR Environment considerations.
SVX9003
1.Filter
2.Inspiratory valve temperature sensor
3.Supply pressure transducer
4.Flow transducer (Delta pressure transducer and net)
5.Nozzle unit with valve diaphragm
6.Inspiratory solenoid
The Gas Modules are factory calibrated. Each Gas
Module must not be disassembled further than
described in chapter 'Preventive maintenance'.
Revision 05 Service Manual 3 - 3
Description of functions SERVO-i Ventilator System
Gas inlet
Gas supply is connected to the ventilators gas inlet
nipples. The design of the gas inlet nipples vary
according to the standard chosen.
Gas is to be connected from hospital central gas
supply or from gas cylinders. The Air supply may be
connected from a compressor for medical air.
Refer to 'Technical data' in the User's Manual for gas
quality specifications.
For Heliox information refer to section 'Heliox' below
in this chapter.
Filter
3
The Filter protects the ventilator from particles in the
gas delivered to the Gas Modules. The filter must be
replaced during the 'Preventive maintenance'.
The filter housing and the filter cover are provided
with matching guide pins. These guide pins prevent
mounting of the filter cover (with gas inlet nipple) on
the wrong module.
A non-return valve for the gas inlet is located in the
filter cover. This valve will suppress short pressure
drops in the gas supply.
The non-return valve is also designed to slowly
evacuate compressed gas from the module, if the
gas supply to the module is disconnected.
Nozzle unit
The plastic Nozzle Unit contains a valve diaphragm.
The valve diaphragm, controlled by the Inspiratory
Solenoid, regulates the gas flow through the Gas
Module.
The complete plastic nozzle unit must be replaced
during the 'Preventive maintenance'.
After replacement, allow the diaphragm to settle
during approx. 10 minutes before gas pressure is
connected to the Gas Module.
Inspiratory solenoid
The gas flow through the Gas Module is regulated by
the Inspiratory Solenoid via the Nozzle Unit.
The current supplied to the solenoid is regulated so
that the gas module will deliver a gas flow according
to the settings on the User Interface.
Gas module key
The Gas Modules are provided with a mechanical
key to prevent that the module is mounted in the
wrong slot.
The key consists of a plastic guide mounted
underneath the module and a corresponding guide
mounted in the patient unit.
Inspiratory valve temperature sensor
The temperature of the supplied gas is measured by
the Inspiratory Valve Temperature Sensor. This
sensor is situated in the gas flow.
The output signal from this sensor is used to
compensate for the gas density variations due to
temperature.
Supply pressure transducer
The pressure of the supplied gas is measured by the
Supply Pressure Transducer.
The output signal from this transducer is amplified. It
is then used to calculate the absolute pressure of the
gas to compensate for gas density variations due to
pressure.
Flow transducer
The gas flows through a net (resistance) which
causes a pressure drop. The pressure is measured
on both sides of this net and the differential pressure
value is then amplified.
ID PROM
Each Gas Module is provided with an ID-PROM. The
ID information can be read by the SERVO-i System.
Connector muff
The Connector Muff connects the Gas Module
outlets to the Inspiratory Pipe inlet.
Inspiratory pipe
The Inspiratory Pipe leads the gas from the
Connector Muff to the Inspiratory Outlet.
The Inspiratory Pipe comprises:
• Housing for the O2 Sensor as well as housing and
locking lever for the O2 cell with its bacteria filter.
• Housing for the Safety Valve.
• Connection for measurement of inspiratory
pressure.
The pipe is provided with internal flanges with the
purpose to improve mixing of O2 and Air.
The O2 Sensor requires a changed design of the
Inspiratory pipe. The O2 Sensor and the Inspiratory
3 - 4 Service Manual Revision 05
SERVO-i Ventilator System Description of functions
pipe are equipped with a mechanical key to prevent
that the O2 Sensor is mounted on wrong type of
Inspiratory pipe. The O
versions of the Inspiratory pipe.
O
cell
2
cell can be used on both
2
The O2 cell is mounted in a housing on the
Inspiratory pipe and is protected by a bacteria filter.
Maintenance including exchange of bacteria filter
according to the User´s manual. The bacteria filter
must also be replaced during the 'Preventive
maintenance'.
The O2 cell gives an output voltage proportional to
the partial pressure of oxygen inside the Inspiratory
pipe. At constant ambient pressure this output is
proportional to the O2 concentration in percent.
In each O2 cell, the output signal will stay at a fairly
constant level usually within 10–17 mV in normal air
and at standard barometric pressure during the life
time of the cell.
The life time of the cell is affected by the O
concentration. With a concentration (at the cell) in %
2
and expected cell life time in hours the following
applies at 25oC (77oF):
O2 Conc. x Expected cell life = 500 000% hours.
The O2 cell is automatically calibrated each time a
Pre-use check is performed (if O2 is connected to the
ventilator).
If the ventilator has continually been in use for a long
time, the measured O2 concentration may drop due
to normal degradation of the O2 cell. This will activate
a nuisance alarm. For further information, refer to the
User's Manual.
Note: Pre-use check is recommended to use to
calibrate the O2 cell.
An ID PROM is integrated into each O2 cell. Its ID
information and remaining lifetime can be read by
the SERVO-i.
O2 Sensor
The O2 Sensor is mounted in a housing on the
Inspiratory pipe as an alternative to the O2 cell.
3
SVX9110
The O2 Sensor is a measuring device for the inspired
oxygen concentration, using ultrasound technique
with two ultrasonic transducers/receivers.
The sound velocity in oxygen is lower than in air.
By measuring the sound velocity in a binary gas mix,
where the two gases are known (air and oxygen),
the ratio between the gases can be calculated,
i.e. O2 concentration.
The technique for the O2 Sensor is similar to the one
in the expiratory cassette, with one transducer
transmitting an ultrasonic pulse through the gas and
the other one receiving the pulse. The measured
time difference between the transmission and the
reception of the pulse is used for calculation of the
sound velocity, which is then used for calculation of
the O2 concentration.
A temperature sensor inside the O2 Sensor measures
the gas temperature and this measurement is used
when calculating the O2 concentration.
The O2 Sensor cannot be used with the Heliox
option.
Each O2 Sensor is provided with an ID-PROM. The
ID information can be read by the SERVO-i System.
Temperature sensor
A Temperature Sensor is integrated into the
connector on top of the O2 Sensor/cell.
This Temperature Sensor measures the temperature
inside the Inspiratory Section.
The output signal, corresponding to the temperature
in the Inspiratory Section, is used for regulation of
the Internal Fan. The electronics for this regulation is
located on PC 1775 Plug-and-play back-plane.
Revision 05 Service Manual 3 - 5
Description of functions SERVO-i Ventilator System
Inspiratory pressure tube
The Inspiratory Pressure Tube connects the Inspiratory Pipe with the Inspiratory Pressure Transducer.
A bacteria filter protects the pressure transducer on
PC 1781 Pressure Transducer from contamination.
Maintenance including exchange of bacteria filter
according to User´s manual. The bacteria filter must
also be replaced during the 'Preventive maintenance'.
Safety valve
The movable axis of the Safety Valve Pull Magnet
controls the opening and closing of the safety valve
membrane in the Inspiratory Pipe. The pull magnet is
electrically activated (closed) from the main block
3
Expiratory Channel.
When the Safety Valve is not activated, the weight of
the pull magnet axis, in combination with the design
of the valve membrane, pushes the pull magnet axis
downwards. This actuates the Safety Valve to be
opened and the inspiratory gas is let out from the
Inspiratory Pipe via the Safety Outlet thus enabling a
decrease in the inspiratory pressure. The Safety
Outlet is covered by a plastic grid.
This is normal safety (pop-off) function.
The opening conditions for the safety valve are:
• The ventilator is switched Off or to Standby.
• The pressure inside the inspiratory pipe is
5 cm H2O above the preset Upper Pressure
Alarm limit. This condition is controlled by the
Monitoring subsystem.
• The pressure inside the inspiratory pipe is
7 cm H2O above the preset Upper Pressure
Alarm limit. This condition is controlled by the
Breathing subsystem.
• The pressure inside the inspiratory pipe is above
117 ±7 cm H2O. This is an extra safety function
and this situation will normally not occur.
• The safety valve will also be opened by some other
alarms, e. g. the Out of gas-alarm.
During startup, the pull magnet is electrically
activated so that the pull magnet axis is pushed up
(with a clicking sound). This is the normal operational
position of the pull magnet; the Safety Valve is
normally kept closed.
The safety valve opening pressure is calibrated to
117 ±3 cm H2O during each Pre-use check.
Inspiratory outlet
22 mm / 15 mm tube connector for the inspiratory
tube of the patient breathing system.
PC 1780 Pneumatic back-plane
Interconnecting board including connectors for
cables to the Gas Modules as well as to the Safety
Valve and to the O2 Sensor/cell and the Temperature
Sensor.
Expiratory section
Functional Main Blocks diagram marking: 'E'.
The main block Expiratory Section conveys the
breathing gas from the patient breathing system to
the Expiratory Outlet. It comprises:
• Measurement of expiratory flow
• Connection for measurement of expiratory
pressure.
• Controlling element for the regulation of expiratory
pressure.
Expiratory cassette
The expiratory gas conveying parts and PC 1786
Expiratory Channel Cassette are integrated into one
part – the Expiratory Cassette – which can be easily
removed for cleaning or exchange. See SERVO-i
Ventilator System – User’s Manual.
The expiratory cassette can be interchanged between
different SERVO-i systems. A Pre-use check is
always required after exchanging the expiratory
cassette.
A re-designed version of the Expiratory cassette was
introduced during Q1 2005 starting with cassette S/N
35000. The new cassette has a larger pressure
transducer channel and this will significantly reduce
the drying time needed before use.
PC 1786
Ultrasonic
transducer
Inlet
SVX9017
Heating
foil
Expiratory
channel cassette
Bacteria
filter
Ultrasonic
transducer
Expiratory pressure
tube connector
Outlet
3 - 6 Service Manual Revision 05
SERVO-i Ventilator System Description of functions
Expiratory inlet
22 mm / 10 mm tube connector for the expiratory
tube of the patient breathing system. The inlet is
designed to make condensed water drip out and
allow use of a water trap for such water to be
collected. Expiratory inlet bacteria filter can be
connected to protect the cassette from
contamination.
Heating foil
An electrical Heating Foil applied on the outside of
the expiratory pipe where the Ultrasonic Flowmeter
is situated. The purpose of the Heating Foil to reduce
condensation and maintain a stable temperature in
the expiratory gas.
Ultrasonic flowmeter
The Ultrasonic Flowmeter is a measuring device for
the expiratory gas flow, using ultrasound technique
with two ultrasonic transducers/receivers.
The measuring process is controlled from the main
block PC 1784 Expiratory Channel.
SVX9018X
The time difference between the downstream and
the upstream time measurements provides flow
information.
A temperature sensor inside the cassette measures
the expiratory gas temperature. This temperature
measurement is also used when calculating the
expiratory flow.
The sound velocity in Heliox is higher than in air.
By measuring the sound velocity in the gas mix,
it will be detected if Heliox is used.
Bacteria filter and expiratory pressure tube
Via a Bacteria Filter inside the cassette, the
Expiratory Pressure Tube connects the cassette to
the Expiratory Pressure Transducer. The filter and
the connector are integrated parts of the cassette.
The filter protects the transducer on PC 1781
Pressure Transducer from contamination.
Expiratory valve
The Expiratory Valve consists of a membrane in the
cassette that is operated by the axis of the
Expiratory Valve Coil. The valve is fully open as long
as no power is supplied to the coil.
Operating capacity for the membrane is estimated to
10.000.000 breathing cycles. When this limit is
passed or if the membrane for some reason has
become defective, it must be replaced. Refer to
instructions in chapter 'Disassembling and
assembling'.
Remaining operating capacity (in %) for the
membrane can be shown in the Status window.
Select Status / Exp. cassette to check 'Remaining
membrane capacity'. The operating capacity meter
must be reset after replacement of the membrane.
3
The left hand side transducer is sending out
ultrasonic sound that is reflected against the inner
wall of the expiratory channel. The ultrasonic sound
is received by the right hand side transducer now
acting as a receiver. The time from sending to
receiving ultrasonic sound in downstream expiratory
gas flow is measured.
Then the right hand side transducer (earlier receiving)
is sending out ultrasonic sound upstream the
expiratory gas flow. The ultrasonic sound is received
by the left hand side transducer now acting as a
receiver. The time from sending to recieving
ultrasonic sound in upstream expiratory gas flow is
measured.
Revision 05 Service Manual 3 - 7
Expiratory valve coil
The movable axis of the Expiratory Valve Coil
controls the opening of the Expiratory Valve by
pushing the valve membrane into desired position.
The power supply to the coil is regulated so that the
remaining pressure in the patient system, towards
the end of the expiration time, is kept on the PEEP
level according to front panel setting.
Expiratory outlet with expiratory one-way valve
The gas from the patient system leaves the ventilator
via this Expiratory Outlet. Backflow via the cassette
is prevented by the Expiratory One-Way Valve. Its
rubber membrane and valve seat are integrated
parts of the Expiratory Outlet.
Description of functions SERVO-i Ventilator System
PC 1786 Expiratory channel cassette
The PC 1786 Expiratory Channel Cassette is a
connection board, integrated into the Expiratory
Cassette, for the Ultrasonic Flowmeter and for the
Heating Foil. It connects to PC 1785 mounted in the
expiratory cassette compartment.
Includes an ID PROM. The ID information can be
read by the SERVO-i System.
PC 1785 Expiratory channel connector
The PC 1785 Expiratory Channel Connector is a
connector board including signal filters that is
mounted in the expiratory cassette compartment.
It connects to PC 1786 mounted in the Expiratory
3
Cassette when the cassette is docked to the
expiratory cassette compartment.
PC 1770 Main back-plane
Interconnection board for the PC boards in the lower
part of the patient unit.
The ventilators System ID (Serial No.), configuration,
operating time, etc, is stored in an EEPROM on PC
1770. Thus, when replacing PC 1770, a spare part
that is factory programmed for the concerned
ventilator must be used.
As the preventive maintenance time stamp will be
reset when replacing PC 1770, a new time stamp
must be set via the Biomed menu. In order to make
this new time stamp correct, the preventive
maintenance must be performed. Refer to chapter
'Preventive maintenance'.
Pressure transducers
Functional Main Blocks diagram marking: 'T'.
PC 1781 Inspiratory pressure transducer
The pressure, conveyed via the pressure tube
connected to this block, is led to and measured by
its differential pressure transducer. With differential
reference to the ambient pressure, the output signal
is proportional to the measured pressure thus giving
a linear measurement in the range -40 cm H2O to
+160 cm H2O.
Technical limitation: Pressure exceeding ±400 cm
H2O must be avoided.
Includes an ID PROM. The ID information can be
read by the SERVO-i System.
PC 1781 Expiratory pressure transducer
Function identical to PC 1781 Inspiratory Pressure
Transducer.
PC 1771 Control
Functional Main Blocks diagram marking: 'C'.
The main block Control comprises microprocessor
control of Breathing pattern for all different
ventilation modes.
Electronics including microprocessor (µP) control to
achieve:
1. Regulation of Inspiratory flow which is used
during inspiration time in Volume Control (VC)
mode.
2. Regulation of Inspiratory pressure which can be
used during inspiration time in any mode.
3. Regulation of a constant Inspiratory flow which is
used during expiration time in all modes.
4. Respiratory timing pattern including frequency as
well as distribution of the duration for Inspiration
time, Pause time and Expiration time according
to front panel settings.
5. Regulation of Inspiratory flow during inspiration
time. The desired total Inspiratory flow value
according to front panel settings is used to
generate the flow reference signals Insp Flow Ref
1 and Insp Flow Ref 2. The level relation between
these two flow reference signals depends on the
desired O2 concentration according to front
panel setting. Insp Flow Ref 1 and Insp Flow Ref
2 are used for the control of its respective Gas
Module (Air and O2).
Regulation of a constant Inspiratory flow during
expiration time: The desired constant Inspiratory flow
value is the default Bias flow value (see User’s
Manual).
This desired constant Inspiratory flow value is used
to generate the flow reference signals Insp Flow Ref 1
and Insp Flow Ref 2 with the same relation and same
handling as described above under 'Regulation of
Inspiratory flow…' except this occurs during
expiration time.
The electronics controlling the optional Servo Ultra
Nebulizer is located on PC 1771 Control.
Includes an ID PROM. The ID information can be
read by the Servo-i System.
Note: The System SW must be re-installed if PC
1771 is replaced.
A lithium battery on PC 1771 power supplies the
internal memory on the PC board. If the battery on
PC 1771 is disconnected or if the battery voltage is
too low, user default configurations made via the
Field Service System (FSS) and Pre-use check
results including transducer calibrations will be
erased. The lithium batteries must be replaced after
5 years.
Note: MR Environment considerations.
3 - 8 Service Manual Revision 05
SERVO-i Ventilator System Description of functions
PC 1772 Monitoring
Functional Main Blocks diagram marking: 'M'.
The main block Monitoring comprises microprocessor
(µP) calculation of parameters and monitoring of
alarm limits with control of alarms (as well as backup alarm). The main block Monitoring co-operates
with the Loudspeaker in the User Interface.
The PC 1772 Monitoring handles all supervision and
alarms in the system. It activates pressure reducing
mechanisms, including activation of the safety valve,
in case of excessive breathing system pressure.
All alarms are conveyed and displayed on the front
panel and the alarm sound is also generated. In case
of malfunction in the loudspeaker located on PC
1777 Panel, a backup sound generating device
(buzzer) on PC 1772 will be activated automatically.
This buzzer is monitored by a microphone at startup
and during the Pre-use check.
The following voltages are supervised:
• +24 V
• +12 V
• -12 V
• +5 V
• +3.3 V
The buzzer on PC 1772 Monitoring generates the
alarm signal in case of +5 V or +3.3 V power failure.
The buzzer and +5 V / +3.3 V failure logic is powered
by backup capacitors in case of power failure.
The alarm signal used by the optional 'Alarm output
connection' is generated on PC 1772.
PC 1772 also contains a barometric transducer and
the measured barometric pressure is supplied to the
other sub-units in the system.
Trending of measured parameters are performed by
Monitoring.
A thermistor on PC 1772 monitors the temperature
inside the Patient Unit. An alarm is activated if the
temperature is 77 ±5 °C (170 ±9 °F) or higher.
Includes an ID PROM. The ID information can be
read by the SERVO-i System.
Note: The System SW must be re-installed if PC
1772 is replaced.
A lithium battery on PC 1772 power supplies the
internal memory on the PC board. If the battery on
PC 1772 is disconnected or if the battery voltage is
too low, all logs and Pre-use check results including
transducer calibrations will be erased. The lithium
batteries must be replaced after 5 years.
Note: MR Environment considerations.
PC 1784 Expiratory channel
Functional Main Blocks diagram marking: 'F'.
The main block Expiratory channel comprises
microprocessor control to achieve measurement of
expiratory flow. The output signal Exp. Flow is used
in the main block Control.
Electronics including microprocessor (µP) for
handling of:
• All electronic connections to and from the
Expiratory Section functions.
• Measurement of airway pressures in both
Inspiratory Section and Expiratory Section.
• Control of the Safety Valve functions in the
Inspiratory Section.
A thermistor on PC 1784 monitors the temperature
inside the Patient Unit. An alarm is activated if the
temperature is 77 ±5 °C (170 ±9 °F) or higher.
Includes an ID PROM. The ID information can be
read by the SERVO-i System.
Note: The System SW must be re-installed if PC
1784 is replaced.
Note: MR Environment considerations.
Power supply
Functional Main Blocks diagram marking: 'P'.
The main block Power Supply comprises conversion
of mains power to internal power supply as well as
the Module unit-connections for optional Battery
modules and/or other optional modules.
The power modes in the SERVO-i System are:
• At Power up, i. e. when the On/Off switch is turned
On, all internal voltages will be enabled.
• At Power down, the Power supply system will
deactivate the hardware signal Power_Good.H,
and at the same time keep the internal voltages +5
V and +3.3 V for at least 1 ms, in order to let the
different subsystems save their current settings in
non-volatile memory. Power down can be caused
by:
– Turning the On/Off switch Off.
– Mains failure resulting in a switch to battery, but
the backup battery voltage is too low for proper
operation of the system or no backup battery
connected.
– The system is powered from a battery, but the
battery voltage becomes too low for proper
operation of the system.
In this Off mode, only charging of Battery modules
is enabled (if the system is connected to mains).
All other circuitry is un-powered.
3
Revision 05 Service Manual 3 - 9
Description of functions SERVO-i Ventilator System
• In Standby all circuitry is powered from the Power
supply, but no breathing will be active. The
operator can set all parameters, including
breathing mode, during Standby.
If the internal DC supply voltage +12 V_Unreg drops
below 10 V, due to power supply failure, the power
supply source will automatically switch. The
following power supply source priority is used:
1. Mains power
2. External +12 V DC supply (if connected)
3. Backup Battery modules.
Power supply selection is managed by:
• PC 1778 – Between Mains power and External
3
+12 V DC power supply.
• PC 1775 – Between Mains power/External
+12 V DC and Battery module power supply.
Mains inlet
Inlet for mains power supply including grounding
connection.
The SERVO-i System will automatically adjust to the
connected mains power if the mains power is within
specified range. No voltage or frequence setting is
required.
The mains inlet is equipped with two mains power
fuses, F11 and F12, rated 2.5 A.
Note: MR Environment considerations (two ferrite
blocks mounted on the mains power cable).
AC/DC Converter
Converts the connected AC Power to the internal DC
supply voltage +12 V_Unreg.
PC 1778 DC/DC & Standard connectors
Converts the internal DC supply voltage +12 V_Unreg
into the following internal DC supply voltages:
• +24 V
• +12 V
• -12 V
• +5 V
• +3.3 V
PC 1778 also controls switching between Mains
power and External 12 V DC power supply.
All standard connectors are located on this board.
The connectors are the following:
• N26 – External +12 V DC supply input. The
connector is equipped with a fuse F1, rated 10 A.
There are no alarms indicating power supply failure
related to the External +12 V DC supply. Thus,
when the External +12 V DC supply is used,
backup Battery modules must be installed to
ensure proper operation.
• N27 – Optional equipment.
• N28 – Control cable.
• N29 – RS232.
Pin configuration and signal names can be found in
chapter 'Diagrams'.
Includes an ID PROM. The ID information can be
read by the SERVO-i System.
PC 1775 Plug-and-play back-plane
Connects the Optional Modules that are inserted in
the Module Unit.
PC 1775 also controls:
• Charging / discharging of the Battery modules.
• Switching between Mains power/External 12 V DC
and Battery module power supply.
• Internal fan using input signals from the
Temperatur sensor in the O2 Sensor/cell connector.
Includes an ID PROM. The ID information can be
read by the SERVO-i System.
Module unit
Connection slots for 6 optional modules, i.e. Battery
modules, CO2 Analyzer Module, Edi Module and
Y Sensor Module.
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SERVO-i Ventilator System Description of functions
Internal fan
The Internal Fan forces cooling air through the
Patient Unit. The cooling air flow inside the Patient
Unit is indicated in the 'Functional Main Block
Diagram'. The cooling air outlets are located in the
expiratory section.
The Internal Fan is controlled by the Temperature
Sensor in the O2 Sensor/cell connector via
electronics on PC 1775 Plug-and-play back-plane.
The fan will start with half effect at approx. 33 °C
(91 °F) and with full effect at approx. 43 °C (109 °F).
When the temperature drops below approx. 37 °C
(99 °F), the fan turns to half effect and when the
temperature drops below approx. 27 °C (81 °F),
the fan stops.
The air inlet is protected by a filter that must be
cleaned or replaced during the 'Preventive
maintenance'.
Optional PC board slots
Functional Main Blocks diagram marking: 'X'.
For optional equipment, the SERVO-i is equipped
with two extra PC-board slots.
The optional Alarm output connector (see below) is
mounted in one of the extra PC-board slots.
Battery module
The Battery module is a 12 V / 3.5 Ah Nickel-Metal
Hydride rechargeable 'smart battery'. Up to six
backup Battery modules can be connected to the
Module unit. To guarantee safe battery backup,
always use at least two batteries.
To calculate its own status, the battery uses an
internal highly accurate voltmeter, amperemeter and
time clock to measure actual charge in and out of
the battery. In addition, there are algorithms to
compensate for the effects of discharge rate,
discharge temperature, self-discharge and charging
efficiency, etc.
Even with this technology, the only time at which the
battery charge status is absolutely reliable is when it
is either completely full or completely empty. What’s
more, if the battery only sees partial charges and
discharges during its application, then it may not get
the benefit of a 'full' or 'empty' reference point for
some time, and must rely more and more on its
calculated figure.
The life span for the Battery module is calculated to
two and a half year from manufacturing date. Normal
time for logistics and storage are included in this
calculation. The calculation corresponds thus to an
estimated operational time of two years.
Manufacturing date (year-week) is printed on the
battery label.
System SW version V2.01.00 (or higher) includes an
improved monitoring of the battery status. This
System SW will, among others, monitor:
• Expiry date.
• If the operational capacity is too poor for continued
usage.
In both cases, battery replacement information will
be shown on the User Interface.
Select 'Status / Batteries' on the User Interface to
check battery status. For further information, refer to
chapter 'Service procedures', section 'Battery
modules'.
With the charge status indicator on the User
Interface, the four green LEDs on the Battery module
are no longer required and will be removed from the
Battery modules.
Recharge time for a discharged battery is approx.
3 hours/battery. If a battery is fully discharged, e.g.
due to long storage time, it may require up to 12
hours charging time.
Each battery includes an ID PROM. The ID
information can be read by the SERVO-i System.
Control cable
This Control Cable connects the Patient Unit and the
User Interface. The cable can be partly winded up
under a rubber cover on the rear of the User
Interface.
Note: The Control cable must only be connected or
disconnected when the ventilator is switched Off.
Note: MR Environment considerations (two ferrite
blocks mounted on the Control cable).
3
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Description of functions SERVO-i Ventilator System
Optional equipment
Aeroneb Pro and Aeroneb Solo
The Aeroneb® Nebulizer Systems, Aeroneb Pro and
Aeroneb Solo, are devices intended to aerosolize
physician-prescribed medications, for inhalation, that
are approved for use with a general purpose
nebulizer.
The Aeroneb Pro / Aeroneb Solo are designed to
operate in-line with standard ventilator circuits and
mechanical ventilators in acute and sub acute care
environments. It operates without changing patient
ventilator parameters.
• Aeroneb Pro: Nebulizer system using the Aeroneb
3
Pro control module and the reusable nebulizer unit.
• Aeroneb Solo: Nebulizer system using the Aeroneb
Pro-X control module and the single use nebulizer
unit Aeroneb Solo.
The Aeroneb Pro / Aeroneb Solo are delivered with
an allround mounting bracket and adapter. For
SERVO-i, an additional holder (accessory) is
available.
The Aeroneb Pro / Aeroneb Solo are an in sourced
finished product manufactured by Aerogen Limited.
For further information, refer to manufacturer's
documentation.
Alarm output connector
Functional Main Blocks diagram marking: 'A'.
PC 1789 Remote alarm connector containing the
optional function Alarm output connector is mounted
in the extra PC-board slot located below PC 1778
DC/DC & Standard connectors.
The Alarm output connector enables connection of
an external alarm signal system to the SERVO-i. High
and medium priority alarms are transferred, and the
alarm output signal is active as long as the audio
alarm is active on the ventilator.
The Alarm output connector has two contact
functions: NO (Normally Open) and NC (Normally
Closed). In an alarm situation the open contact will
close and the closed one will open. The contacts are
independent of polarity and can be used both with
AC and DC systems.
Preferably the NC contact should be used, as this
will detect any interruption in the alarm system or
unintentional disconnection of the cable between the
system and the ventilator. Furthermore, if both the
NO- and the NC-contacts are utilized, an even higher
safety level for unforeseen failures can be achieved.
Note that, in both cases, even an intentional
disconnection of the ventilator will trigger the
external alarm.
Pin configuration and signal names in P67 – Alarm
output connector can be found in chapter
'Diagrams'.
The Alarm output- function must be enabled in the
configuration software.
For further information, refer to the 'Alarm output
connector – Reference Manual'
Battery module
The Module unit allows up to six Battery modules.
To guarantee safe battery backup, always use at
least two batteries.
For further information, refer to section 'Battery
modules' above in this chapter.
Compressor Mini
The Compressor Mini is designed to supply
medicalgrade compressed air. The compressor has
a capacity of approx. 30 l/min at a pressure of 350 450 kPa (50 - 64 psi).
The Compressor Mini can be placed on the ventilator
cart to form a compact unit which is easy to move. It
can also be used as a stand-alone unit.
The Compressor Mini is well insulated against noise
and therefore does not cause disturbance when
used during operations.
The Compressor Mini is equipped with a standby
function. In the standby mode, the compressor will
start to deliver compressed air if the hospital central
gas supply fails.
For further information, refer to separate Compressor
Mini documentation.
CO2 Analyzer Module
The CO2 Analyzer Module is an optional accessory
that is connected to the Module unit.
The CO2 Analyzer option allows for continuous
monitoring shown in a waveform (capnogram) and as
numericals on the screen.
The CO2 Analyzer Module is, via a cable, connected
to a Capnostat sensor mounted on an airway
adapter at the Y-piece. The sensor uses a solid state
and IR based optical system with no moveable parts.
It measures the difference between a reference light
beam and one filtered for CO2 wavelength.
The CO2 Analyzer- function must be enabled in the
configuration software.
For electrical safety test of the module, refer to
standard procedures regulated by IEC/EN 60601-1
Class 1, Type BF or corresponding national standard.
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