Maquet Servo-S User manual

SERVO-s Ventilator System Service Manual

Important SERVO-s Ventilator System

Notes

1 - 2 Service Manual Revision 02

SERVO-s Ventilator System Important

Contents

1. Important .......................................................................

2. Introduction ...................................................................

3. Description of functions ...............................................

4. Disassembling and assembling ...................................

5. Service procedures.......................................................

6. Troubleshooting ............................................................

7. Preventive maintenance...............................................

8. Index ..............................................................................

9. Service Manual revision history...................................

10. Diagrams .......................................................................

Revision 02 Service Manual 1 - 3

Important SERVO-s Ventilator System

Important

General

• Service documentation for the SERVO-s

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-s System is also

available.

• The SERVO-s Ventilator System is referred to as

the SERVO-s throughout 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 left-over 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-s, there are energized electrical components inside the unit. Exercise extreme caution if power supply connected and covers are removed.

• Technical training. Refers to the Technical training supplied by MAQUET.

• Service contract. Refers to the Service contract 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 02

• Only personnel trained and authorized by MAQUET shall be permitted to install the SERVO-s. The installation and handing-over procedures are described in the 'SERVO-s Ventilator System – Installation Instructions'.

Functional check

• After any installation, maintenance or service intervention in the SERVO-s, perform a 'Pre-use check' according to instructions in the 'SERVO-s Ventilator System – User's Manual'.

Installation

SERVO-s Ventilator System Important

Important

Service

• The SERVO-s 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.

Hazard notices

• Before disassembling or assembling of the SERVO-s, make sure that the:

– On/Off switch is set to Off. – Mains power cable is disconnected. – Gas supply is disconnected (wall and/or

cylinder).

– 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-s, 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-s. 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-s Ventilator System – User's Manual'.

Revision 02 Service Manual 1 - 5

Important SERVO-s Ventilator System

Important

Environmental declaration

Purpose

This environmental declaration is for a SERVO-s base unit.

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 1771 Control, including a Lithium battery (C)

• PC 1772 Monitoring, including Lithium battery (M)

• PC 1777 Panel including Backlight Inverter (U)

• PC 1781 Pressure transducer, 2 each (T)

• PC 1784 Expiratory channel (F)

• PC 1785 Expiratory channel connector (E)

• PC 1786 Expiratory channel cassette (E)

• PC 1860 Main back-plane

• PC 1861 Pneumatic back-plane (I)

• PC 1862 DC/DC & Standard connectors (P)

• PC 1863 Power control (P)

Construction materials

The construction materials used in SERVO-s in % of the total weight.

Metal – total 72.5%

• Aluminium 70%

• Steel, zink, brass 2.5%

Polymeric material – total 8%

• 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)

Electronics – total 19.5%

Other electronics

• TFT assembly including backlight (U)

• Touch screen (glass) (U) cell, containing caustic lime and lead (Pb) (I)

•O

Sensor, containing PC boards (I)

•O

• Gas module Air, containing multiple PC boards (I)

• Gas module O

• AC/DC Converter, containing PC boards (P)

• Expiratory cassette (E)

• Expiratory valve coil (E)

• Safety valve pull magnet (I)

• Battery modules Nickel-Metal Hydride (P)

1 - 6 Service Manual Revision 02

, containing multiple PC boards (I)

• Battery modules Nickel-Metal Hydride

• Printed circuit boards, cables etc.

Others – very small amounts

• Filter paper of fibre glass

SERVO-s Ventilator System Important

Important

Articles of consumption

1. Bacteria filter

2. Filters for the gas modules

3. Filter for the inspiration pressure transducer

4. Filter for the O

5. Nozzle units for the gas modules

6. Battery modules

7. Lithium batteries

8. Expiratory cassette

9. Expiratory cassette membrane cell (if applicable)

10. O

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.

cell (if applicable)

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

• Shock-absorbing material of expanded polyethylene, EPE, or expanded polypropylene, EPP.

Product End-of-Life

For scrapping information, refer to the document 'SERVO-s Ventilator System – Product End-of-Life Disassembly Instructions.

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 02 Service Manual 1 - 7

Important SERVO-s Ventilator System

Notes

1 - 8 Service Manual Revision 02

SERVO-s Ventilator System Introduction

Only personnel trained and authorized by MAQUET shall be permitted to perform installation, service or maintenance of the SERVO-s.

Make sure to prepare the SERVO-s 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-s, perform a 'Pre-use check'. Refer to the 'SERVO-s 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-s software structure ............................. 2 - 9

General ........................................................... 2 - 9

Breathing ........................................................ 2 - 9

Monitoring ...................................................... 2 - 9

Panel ............................................................... 2 - 9

System ID ....................................................... 2 - 9

Revision 02 Service Manual 2 - 1

Introduction SERVO-s Ventilator System

Main units

The SERVO-s is configured for adults and pediatrics with a number of ventilation modes suitable for these patient categories.

The SERVO-s 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 back-up is also contained in the Patient Unit.

The Control cable connects the User Interface and the Patient Unit.

ServoS-9000

User Interface

Patient Unit

Control cable

2 - 2 Service Manual Revision 02

SERVO-s Ventilator System Introduction

A number of optional equipment can be added to the SERVO-s Ventilator System. For further information, refer to the documents listed below.

Mobile cart SERVO-s

• SERVO-s – User's manual

• Mobile cart, SERVO-s – Installation Instructions

Shelf base SERVO-s

• SERVO-s – User's Manual

• Shelf base, SERVO-s – Installation Instructions

Support Arm 176/177

• SERVO-s – User's Manual

• Support Arm 176/177 – Installation Instructions

Gas cylinder restrainer SERVO-s

• SERVO-s – User's manual

• Gas cylinder restrainer, SERVO-s – Installation Instructions

Aeroneb Pro

• Aeroneb Pro – Instruction Manual

• Aeroneb Pro – Installation Instructions

User Interface panel cover

• SERVO-s – User's Manual

• User Interface panel cover – Installation Instructions

Loudspeaker booster kit

• Loudspeaker booster kit – Installation Instructions

Isolation shield with drip guard

• Isolation shield with drip guard – Installation Instructions

Compressor Mini

• SERVO-s – User's Manual

• Compressor Mini – Operating Manual

• Compressor Mini – Service Manual

• Compressor Mini – Installation Instructions

Alarm output connector

• SERVO-s – User's Manual

• Alarm output connector – Reference Manual

Humidifier, Humidifier Holder and Humidifier Holder for rail

• SERVO-s – User's Manual

• Humidifier – Operating Manual

• Humidifier Holder – Installation Instructions

Waterbag pole

• Instructions mounted on the pole.

Revision 02 Service Manual 2 - 3

Introduction SERVO-s Ventilator System

ServoS-9002

User Interface

Items accessible from the outside of the User Interface are shown in the above illustration.

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, for PC.

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. Locking arm, tilting.

18. 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 02

SERVO-s Ventilator System Introduction

;

ServoS-9004

ServoS-9003

When the front panel section is removed from the rear cover, the following parts are accessible:

1. Touch screen incl. frame.

2. TFT Display.

3. Backlight lamp.

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 02 Service Manual 2 - 5

Introduction SERVO-s Ventilator System

ServoS-9005

Patient Unit

Items accessible from the outside of the Patient Unit are shown in the illustration above. All labels attached to the rear side of the Patient Unit are described in the User's Manual.

1. Expiratory outlet.

2. Gas module for Air.

3. Gas module for O

4. Internal fan with filter.

5. Control cable connector.

6. Serial port for data communication (RS 232).

7. Alarm output connector (optional).

8. Connector for external +12V DC power supply.

9. Fuse F1 for external +12V DC power supply.

10. Mains supply connector incl. fuses F11 and F12.

11. Equipotentiality terminal.

12. Inspiratory outlet.

13. Expiratory inlet.

14. 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 02

SERVO-s Ventilator System Introduction

When the Patient Unit main cover is opened, the following parts are accessible:

1. The inner part of the two gas modules including their nozzle units.

2. Connector muff.

3. Inspiratory pressure transducer tube, incl. bacteria filter, to connect the inspiratory pressure transducer.

4. Inspiratory pipe with housings for the O cell and for the safety valve.

cell incl. bacteria filter.

5. O

Sensor. Alternative to the O2 cell for oxygen

6. O

concentration measurement.

Sensor/

7. PC 1861 Pneumatic back-plane (covered by the metal plate). The gas modules, the O and the safety valve pull magnet are connected

Sensor/cell

to PC 1861.

ServoS-9012

ServoS-9013

?< ;H69

ServoS-9108

@"

When the Patient Unit main cover is removed, the following parts are accessible:

8. AC/DC Converter.

9. PC 1772 Monitoring.

10. PC 1771 Control.

11. PC 1863 Power control.

12. PC 1862 DC/DC & Standard connectors.

13. PC 1860 Main back-plane. The PC boards listed above are connected to PC 1860 Main backplane.

14. Battery modules.

15. Internal fan.

A!.

Revision 02 Service Manual 2 - 7

Introduction SERVO-s Ventilator System

ServoS-9014

ServoS-9015

When the Patient Unit side cover is removed, the following parts are accessible:

16. PC 1784 Expiratory channel with the two connected PC 1781 Inspiratory and Expiratory Pressure Transducers.

17. PC 1785 Expiratory channel connector.

18. Expiratory valve coil.

The expiratory cassette (19) 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 (17).

ServoS-9016

2 - 8 Service Manual Revision 02

SERVO-s Ventilator System Introduction

EXP.

INLET

SERVO-s software structure

General

The SERVO-s software 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-s software is divided into the following software subsystems:

• Breathing

• Monitoring

• Panel

• System ID

PC 1777

PANEL SW

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 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.

Monitoring

The Monitoring SW controls all monitoring and alarm functions in the system, including trends of measured values (trend data not available in SERVO-s v1.0). 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

Sensor. New software can be installed via a

the O

SW Service Release. The Monitoring SW is executed by the

microprocessor on PC 1772.

Panel

AC/DC CONVERTER

MONITORING SW

BREATHING SW

PC 1863

PC 1862

BATTERY BATTERY

ServoS-9017

PC 1772

PC 1771

INSP.

OUTLET

SYSTEM ID SW

PC 1861

PC 1860

BREATHING SW

EXP.

INLET

PC 1785

PC 1781

PC 1784

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.

The Panel SW is executed by the microprocessor on PC 1777.

EXP.

System ID

The System ID SW is a configuration file, stored on PC 1860 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 1860 Main Back-Plane, a spare

Revision 02 Service Manual 2 - 9

part that is factory programmed for the concerned ventilator must be used.

Introduction SERVO-s Ventilator System

Notes

2 - 10 Service Manual Revision 02

SERVO-s Ventilator System Description of functions

Only personnel trained and authorized by MAQUET shall be permitted to perform installation, service or maintenance of the SERVO-s.

Make sure to prepare the SERVO-s 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-s, perform a 'Pre-use check'. Refer to the 'SERVO-s 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-s ................ 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 1860 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

Control cable ..................................................... 3 - 11

Optional equipment ........................................... 3 - 12

Alarm output connector ................................. 3 - 12

Loudspeaker booster kit ................................ 3 - 12

Isolation shield with drip guard ...................... 3 - 12

Revision 02 Service Manual 3 - 1

Description of functions SERVO-s Ventilator System

About this chapter

This text refers to the Functional Main Blocks diagram in chapter 'Diagrams'.

Memory types used in the SERVO-s

There are four different types of memories used in the SERVO-s:

• Flash memory. For System SW storage. Present on PC 1771, PC 1772, PC 1777, PC 1784 and in the

Sensor. The System SW can be re-installed/

updated using a SW Service Release.

• RAM. For temporary storage of software and data.

Present on PC 1771, PC 1772 and PC 1777.

• 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 O EEPROM is emulated by the Flash memory.

cell. In the O2 Sensor, an

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 201200 (SERVO-s S/N 02000).

• Type 2 – User Interface S/N 201201 (SERVO-s S/N 02001) 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-s Spare Parts List.

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 1860 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-s.

• On/Off switch: Switch to Power up or Power down the SERVO-s . 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.

• Connection for PC (P86): Ethernet port intended for test and service purpose. Connected via a service cable. For future options.

• Microphone used to monitor 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.

Loudspeaker

For generation of sound, e.g. alarm. Connected to

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.

3 - 2 Service Manual Revision 02

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.

SERVO-s 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 incl. 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 incl. frame, Type 1 and Type 2. The Touch screen incl. 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 to the patient breathing system. It comprises the following main functions:

• Gas Modules – Air and O

• Connector Muff.

• Inspiratory Pipe. Sensor/cell.

•O

• Inspiratory Pressure Tube.

• Safety Valve including pull magnet.

• Inspiratory Outlet.

• PC 1861 Pneumatic Back-Plane.

Gas modules – Air and O

The Air and O2 Gas Modules regulates the inspiratory gas flow and gas mixture.

supply

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.

ServoS-9018

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 02 Service Manual 3 - 3

Description of functions SERVO-s 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.

Filter 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.

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.

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.

ID PROM Each Gas Module is provided with an ID-PROM. The

ID information can be read by the SERVO-s.

Connector muff

The Connector Muff connects the Gas Module outlets to the Inspiratory Pipe inlet.

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.

Inspiratory pipe

The Inspiratory Pipe leads the gas from the Connector Muff to the Inspiratory Outlet.

The Inspiratory Pipe comprises:

• Housing for the O locking lever for the O

Sensor as well as housing and

cell with its bacteria filter.

• Housing for the Safety Valve.

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.

Nozzle unit The plastic Nozzle Unit contains a valve diaphragm.

The valve diaphragm, controlled by the Inspiratory

• Connection for measurement of inspiratory pressure.

The pipe is provided with internal flanges with the purpose to improve mixing of O

The O Inspiratory pipe. The O pipe are equipped with a mechanical key to prevent that the O Inspiratory pipe. The O versions of the Inspiratory pipe.

Sensor requires a changed design of the

Sensor is mounted on wrong type of

Sensor and the Inspiratory

cell can be used on both

and Air.

Solenoid, regulates the gas flow through the Gas Module.

3 - 4 Service Manual Revision 02

SERVO-s Ventilator System Description of functions

cell

The O Inspiratory Pipe and is protected by a bacteria filter.

cell is mounted in a housing on the

Sensor

The O Inspiratory pipe as an alternative to the O

Sensor is mounted in a housing on the

cell.

Maintenance including exchange of bacteria filter according to the User´s manual. The bacteria filter must also be replaced during the 'Preventive maintenance'.

The O the partial pressure of oxygen inside the Inspiratory pipe. At constant ambient pressure this output is proportional to the O

In each O 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 % and expected cell life time in hours the following applies at 25

The O Pre-use check is performed (if O ventilator).

If the ventilator has continually been in use for a long time, the measured O to normal degradation of the O a nuisance alarm. For further information, refer to the User's Manual.

Note: Pre-use check is recommended to use in order to calibrate the O

An ID PROM is integrated into each O information and remaining lifetime can be read by the SERVO-s.

cell gives an output voltage proportional to

concentration in percent.

cell, the output signal will stay at a fairly

C (77oF):

Conc. x Expected cell life = 500 000% hours.

cell is automatically calibrated each time a

concentration may drop due

cell.

is connected to the

cell. This will activate

cell. Its ID

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,

concentration.

i.e. O

The technique for the O in the expiratory cassette, with one transducer

Sensor is similar to the one

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

concentration.

the O

A temperature sensor inside the O the gas temperature and this measurement is used when calculating the O

Each O information can be read by the SERVO-s System.

Sensor is provided with an ID-PROM. The ID

concentration.

Sensor measures

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'.

Revision 02 Service Manual 3 - 5

Description of functions SERVO-s Ventilator System

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 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 H Alarm limit. This condition is controlled by the

O above the preset Upper Pressure

Monitoring subsystem.

• The pressure inside the inspiratory pipe is 7 cm H Alarm limit. This condition is controlled by the

O above the preset Upper Pressure

Breathing subsystem.

• The pressure inside the inspiratory pipe is above 117 ±7 cm H this situation will normally not occur.

O. This is an extra safety function and

• 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 H

O during each Pre-use check.

Inspiratory outlet

22 mm / 15 mm tube connector for the inspiratory tube of the patient breathing system.

PC 1861 Pneumatic back-plane

Interconnecting board including connectors for the Gas Modules as well as cable connectors for the Safety Valve and the O

Sensor/cell.

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-s Ventilator System – User’s manual.

The expiratory cassette can be interchanged between different SERVO-s 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

ServoS-9019

Heating

foil

Expiratory

channel cassette

Bacteria

filter

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.

Ultrasonic

transducer

Expiratory pressure

tube connector

Outlet

3 - 6 Service Manual Revision 02

SERVO-s Ventilator System Description of functions

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.

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.

SVX9018X

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 receiving ultrasonic sound in upstream expiratory gas flow is measured.

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.

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.

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-s.

Revision 02 Service Manual 3 - 7

Description of functions SERVO-s Ventilator 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 Cassette when the cassette is docked to the expiratory cassette compartment.

PC 1860 Main back-plane

Interconnection board for the PC boards in the leftside part of the patient unit.

The ventilators System ID (Serial No.), configuration, operating time, etc, is stored in an EEPROM on PC

1860. Thus, when replacing PC 1860, 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 1860, 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 H +160 cm H

Technical limitation: Pressure exceeding ±400 cm

O must be avoided.

Includes an ID PROM. The ID information can be read by the SERVO-s.

PC 1781 Expiratory pressure transducer

Function identical to PC 1781 Inspiratory Pressure Transducer.

O to

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 O setting. Insp Flow Ref 1 and Insp Flow Ref 2 are used for the control of its respective Gas Module (Air and O

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.

Includes an ID PROM. The ID information can be read by the SERVO-s.

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.

concentration according to front panel

3 - 8 Service Manual Revision 02

SERVO-s 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-s.

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.

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-s.

Note: The System SW must be re-installed if PC 1784 is replaced.

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 connections for the Battery modules.

The power modes in the SERVO-s System are:

Power up, i. e. when the On/Off switch is turned

• At On, all internal voltages will be enabled.

Power down, the Power supply system will

• At 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.

– 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.

Standby all circuitry is powered from the Power

• In supply, but no breathing will be active. The operator can set all parameters, including breathing mode, during Standby.

Revision 02 Service Manual 3 - 9

Description of functions SERVO-s Ventilator System

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 1862 – Between Mains power and External +12 V DC supply.

• PC 1863 – Between Mains power/External +12 V DC and Battery module power supply.

Mains inlet

Inlet for mains power supply including grounding connection.

The SERVO-s 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.

AC/DC Converter

Converts the connected AC Power to the internal DC supply voltage +12 V_Unreg.

PC 1862 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 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.

• N28 – Control cable.

• N29 – RS232.

• P63 – Alarm output connector. Refer to section Optional equipment.

Pin configuration and signal names can be found in chapter 'Diagrams'.

Includes an ID PROM. The ID information can be read by the SERVO-s.

PC 1863 Power control

Connects and controls charging of the Battery modules.

A Temperature Sensor is integrated on PC 1863. This sensor measures the temperature inside the Patient Unit. The output signal, corresponding to the temperature inside the Patient Unit, is used for regulation of the Internal Fan.

Includes an ID PROM. The ID information can be read by the SERVO-s.

3 - 10 Service Manual Revision 02

SERVO-s Ventilator System Description of functions

Battery modules

There are two backup Battery modules connected. The Battery module is a 12 V / 3.5 Ah Nickel-Metal Hydride rechargeable 'smart battery'.

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 module includes an ID PROM. The ID information can be read by the SERVO-s.

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 Internal Fan is controlled by the Temperature Sensor on PC 1863 Power control. 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'.

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.

Revision 02 Service Manual 3 - 11

+ 65 hidden pages

Maquet Servo-S User manual

Specifications and Main Features

Frequently Asked Questions

User Manual