Maquet Servo-S User manual

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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.

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• 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)

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, 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

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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

Description of functions SERVO-s Ventilator System

Optional equipment

Alarm output connector (optional)

The Alarm output connector P63 is integrated in PC 1862 DC/DC & Standard connectors and mounted on all units. The 'Alarm output'-option must however be enabled in the configuration software to access this function.

The Alarm output connector enables connection of an external alarm signal system to the SERVO-s. 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.

Pin configuration and signal names in P63 – Alarm output connector can be found in chapter 'Diagrams'.

For further information, refer to the 'Alarm output connector – Reference Manual'

Loudspeaker booster kit (optional)

By installing the accessory 'Loudspeaker booster kit', the alarm sound is amplified in a mechanical way. The sound level will be increased significantly. This increased sound level will raise the complete alarm sound setting range (20%–100%), i.e. also the lower sound level range will be increased.

The Loudspeaker booster consists of a rubber collar that is mounted onto the loudspeaker to direct the sound towards the loudspeaker grid.

All parts required for the installation are included in the Loudspeaker booster kit.

Isolation shield with drip guard (optional)

The optional Isolation shield with drip guard is connected to the Expiratory cassette outlet. The accessory will not affect the expiratory resistance of the system.

The main purpose of this accessory is to protect the expiratory outlet pipe from direct cooling draught favoring condensation.

The drip guard will also collect water that may be condensed during ventilation in connection with use of dual-heated patient tube during active humidification. The water collector has a maximum volume of 100 ml.

3 - 12 Service Manual Revision 02

SERVO-s Ventilator System Disassembling and assembling

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.

4.Disassembling and assembling

General .............................................................. 4 - 2

Preparations ...................................................... 4 - 2

Handling PC boards .......................................... 4 - 2

Replacing PC boards ........................................ 4 - 2

Assembling guidelines ...................................... 4 - 2

Tightening torque ........................................... 4 - 2

Threadlocking adhesives ............................... 4 - 2

User Interface .................................................... 4 - 3

PC 1777 Panel................................................ 4 - 4

Backlight inverter ........................................... 4 - 6

TFT Display ..................................................... 4 - 7

Backlight lamps .............................................. 4 - 9

Touch screen including frame ....................... 4 - 10

Membrane foil ................................................. 4 - 12

Patient Unit ........................................................ 4 - 14

Main and side covers ..................................... 4 - 14

Remove the User Interface from

the Patient Unit............................................... 4 - 15

Gas modules .................................................. 4 - 15

Battery modules ............................................. 4 - 16

PC 1771 Control and PC 1772 Monitoring.... 4 - 16

AC/DC Converter ........................................... 4 - 16

PC 1863 Power control .................................. 4 - 17

PC 1862 DC/DC & Standard connectors ...... 4 - 17

PC 1860 Main back-plane ............................. 4 - 17

Internal fan ...................................................... 4 - 18

Inspiratory channel ......................................... 4 - 18

Safety valve membrane.................................. 4 - 18

PC 1861 Pneumatic back-plane .................... 4 - 19

PC 1784 Expiratory channel .......................... 4 - 19

PC 1785 Expiratory channel connector......... 4 - 20

Expiratory valve coil ....................................... 4 - 20

Expiratory cassette membrane ...................... 4 - 21

Control cable ..................................................... 4 - 22

Revision 02 Service Manual 4 - 1

Disassembling and assembling SERVO-s Ventilator System

General

Disassembling of the SERVO-s is described in this chapter. If not stated otherwise, the assembling procedure is the reverse of the described disassembling procedure.

The illustrations in the SERVO-s Spare Parts List are very useful as a guide when disassembling and assembling the SERVO-s.

Preparations

Before disassembling or assembling the SERVO-s:

• Set the On / Off switch on the User Interface to Off.

• Disconnect the mains power cable.

• Disconnect the gas supplies (wall and/or

cylinder).

• Make sure that all gas conveying parts are cleaned according to instructions in the 'SERVO-s Ventilator System – User's Manual'.

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

Handling PC boards

The PC boards contain components that are highly sensitive to static electricity.

Those who come into contact with circuit boards containing sensitive components must take certain precautions to avoid damaging the components (ESD protection).

When working with ESD sensitive components, always use a grounded wrist band and grounded work surface. Adequate service tools must also be used.

PC boards (spare parts) must always be kept in protective packaging for sensitive electronic device.

PC boards must not be inserted or removed while the mains power or battery power is applied to the PC boards.

Remove and insert the PC boards very carefully to avoid damage to the connectors.

Replacing PC boards

The SERVO-s System SW is distributed on different subsystems, located on the following PC boards:

• PC 1771 Control

• PC 1772 Monitoring

• PC 1784 Expiratory Channel

• PC 1777 Panel. When delivered as spare parts, these PC boards are

equipped with a 'System SW version' that may differ from the version on the unit to be repaired. To keep the 'System SW version' used prior to the PC board replacement, the applicable 'System SW version' must be available on a PC Card for reinstallation purposes.

For functionality enhancement, the latest released 'System SW version' is always recommended.

Before installing a new 'System SW version' on a unit, ensure that the software is fully compatible with all HW-, SW- and mechanical components in the unit. If any compatibility conflicts are apparent this will be noted on the 'MCC SW download' website.

Assembling guidelines

All parts of the unit assembled with screws and nuts are tightened with a specified torque. In the User Interface, some of the screws are also secured with threadlocking adhesives as noticed during disassembling.

In order to maintain these specifications over time, it must be ensured that after any service intervention removed parts are re-assembled and secured according to instructions. Make sure to follow the guidelines stated below.

Tightening torque

• Thread size M3: 0.95 ±0.05 Nm

• Thread size M4–M6: 3.1 ±0.1 Nm.

Threadlocking adhesives

• Electrolube Bloc'Lube BLV15ML® on threads in contact with PC boards.

• Loctite 243® on all other threads.

4 - 2 Service Manual Revision 02

SERVO-s Ventilator System Disassembling and assembling

User Interface

With power supply connected to the SERVO-s, there are energized electrical components inside the unit, e. g. the backlight lamps that are supplied with 660 V by the Backlight Inverter. All personnel must exercise extreme caution if fault tracing or adjustments are performed with power supply connected and with the user interface rear cover removed.

ServoS-9021

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.

The electronics inside the User Interface differs and 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.

The User Interface in the adjacent illustration is equipped with the On/Off switch cover introduced Q2 2007. Refer to section 'PC 1777 Panel' for further information.

To separate the front panel section from the rear cover:

• Disconnect the control cable (1).

• Remove the screws (2). Threadlocking adhesive is not used on these screws.

• Lift off the rear cover from the front panel section.

All parts inside the front panel section are now accessible.

When removing the rear cover:

• The PC Card eject button can catch on the PC Card slot during disassembling. Carefully release the button from the rear cover before removing the cover.

HHH

When mounting the rear cover on units with the new version of the On/Off switch and switch cover:

• The switch must be set to 'On' before mounting the rear cover. If set to 'Off', the switch lever will not enter the hole in the switch cover.

The main parts of the User Interface are:

• Rear cover (3).

• PC 1777 Panel (4).

• Backlight Inverter (5).

• Support plate (6).

• TFT Display (7) including Backlight lamps.

• Touch screen incl. frame (8).

ServoS-9089

Revision 02 Service Manual 4 - 3

=;?@9

Disassembling and assembling SERVO-s Ventilator System

PC 1777 Panel

PC 1777A – D = Type 1 PC 1777F or higher = Type 2

To remove PC 1777 Panel (1):

• Carefully disconnect all cable connectors from PC 1777.

• Remove the screws (2) holding PC 1777.

• Lift off PC 1777.

Note: When replacing PC 1777 Panel, it can be necessary to re-install the System SW. For further information, refer to section 'Replacing PC boards' in this chapter. For PC 1777 of Type 2, System SW version V2.00.04 or higher is required.

ServoS-9022

Type 1 = PC 1777A – D

ServoS-9020

Type 2 = PC 1777F or higher

HH6

A new design of the On/Off switch was introduced Q2 2007. This switch also requires a new version of the switch cover. Refer to illustrations below.

With this new design, the switch cover will be kept open when the switch is Off and will be closed only when the switch is On.

PC 1777 Panel, when delivered as spare part, will be equipped with the new design of the On/Off switch.

HH6

The spare part will thus also include a new switch cover to be mounted on the User Interface.

On/Off switch and switch cover - Old design

ServoS-9110

4 - 4 Service Manual Revision 02

On/Off switch and switch cover - New design

SERVO-s Ventilator System Disassembling and assembling

Replacement of PC 1777 Type 1

PC 1777 Type 1 is discontinued and no longer supplied as spare part. To replace such PC 1777, the 'Replacement kit for PC 1777A–D' must be used.

Note: The Disassembling/Assembling instructions and the illustration below is valid only for the 'Replacement kit for PC 1777A–D'.

The kit contains all parts required for the replacement:

• PC 1777 of Type 2 (6)

• PC 1777–TFT Display cable of Type 2 (10)

• Support plate (5)

• Cushion for the EMC filter (9)

• Retainer (12)

• Screw, M3x8 mm (24 each)

• Screw, M3x6 mm (4 each).

9;< ?.

=@  A



Disassembling

Installation of the replacement kit must be performed in a clean and dustfree environment as the TFT Display is sensitive to contaminations.

• Separate the front panel section from the rear cover.

• Remove the loudspeaker (3) from the support plate.

• Remove PC board Backlight Inverter (4) from the support plate (5).

• Remove the support plate including PC 1777 Panel (6) and TFT Display (7) from the front panel section.

• Remove the TFT Display from the support plate.

• Discard the old PC 1777, the support plate and the PC 1777–TFT Display cable of Type 1.

Assembling

• Check type and version of the TFT Display (7).

• Adapt the setting of the DIP switch (8) on the new PC 1777 to the TFT Display. Refer to section 'TFT Display' below.

• Mount the TFT Display (7) onto the new support plate (5) using the new M3x6 mm screws.

• Attach the cushion (9) onto the EMC filter (11) as shown in the illustration.

• Connect the cable (10) to the TFT Display. Organize the cable, place the EMC filter in the support plate recess and secure with the retainer (12) as shown in section 'TFT Display' below.

• Mount the remaining parts onto the new support plate. Use the new M3x8 mm screws.

– PC 1777 (6) – PC board Backlight Inverter (4) – Loudspeaker (3).

• Restore the complete assembly into the front panel section.

• Connect all remaining cable connectors.

• Restore the User Interface.

Revision 02 Service Manual 4 - 5

Disassembling and assembling SERVO-s Ventilator System

Backlight Inverter

Type 1

To remove the PC board Backlight Inverter (1):

• Carefully disconnect the cable connector (2).

;

• Carefully disconnect the backlight lamp cable connectors (3).

• Remove the screws (4) holding PC board Backlight Inverter.

• Lift off PC board Backlight Inverter.

;

ServoS-9023

Type 2

To remove the PC board Backlight Inverter (5):

• Carefully disconnect the cable connector (6).

• Carefully disconnect the backlight lamp cable connector (7).

• Loosen the screws (8).

• Remove the screws (9) holding PC board Backlight Inverter.

• Lift off PC board Backlight Inverter.

Note: When assembling, make sure that the plastic washers on screws (8) are fitted between the PC board and the screwhead.

ServoS-9095

4 - 6 Service Manual Revision 02

SERVO-s Ventilator System Disassembling and assembling

TFT Display

Note: Disassembling of the TFT Display must be performed in a clean and dustfree environment, as the TFT Display is sensitive to contaminants.

6HH H

ServoS-9024

;;

;

Type 1

The TFT Display is mounted under the support plate (1). To remove the TFT Display:

• Carefully disconnect all cables from PC 1777. The Backlight Inverter cable and the Loudspeaker cable can remain connected.

• Carefully disconnect the Backlight lamp cables from PC board Backlight Inverter.

• Remove the screws (2) holding the support plate.

• Lift off the support plate-assembly, including TFT Display and PC boards.

Type 2

The TFT Display is mounted under the support plate (3). To remove the TFT Display:

• Carefully disconnect all cables from PC 1777. The Backlight Inverter cable and the Loudspeaker cable can remain connected.

• Carefully disconnect the Backlight lamp cable from PC board Backlight Inverter.

• Remove the screws (4) holding the support plate.

• Lift off the support plate-assembly, including TFT Display and PC boards.

DIP switch on PC 1777 Type 2

Faulty DIP switch (5) setting will result in a reversed display image.

ServoS-9094

;

Revision 02 Service Manual 4 - 7

;;

Settings for TFT Display:

• SHARP LQ12S41 • SHARP LQ121S1DG11

• NEC NL8060BC31-27

Disassembling and assembling SERVO-s Ventilator System

• Remove the screws (6) holding the TFT Display to the support plate.

ServoS-9025

Type 1

• Carefully release the Type 1-cable (7) from PC 1777 as shown in the illustration.

ServoS-9026

ServoS-9106

ServoS-9109

Type 2

On units produced prior to Q2 2007, the Type 2cable is secured with a self-adhesive cushion mounted on the cable connector at the TFT Display. There is also a similar cushion on the cables EMCfilter.

• To disconnect; carefully release the Type 2-cable

A new locking device for the Type 2-cable was introduced Q2 2007. This device replaces the cushion mounted on the cable connector at the TFT Display. The cushion on the EMC-filter remains.

• Slide the locking device (9) into position until it

• The adjacent illustration also shows PC 1777

AA

(8) from PC 1777 as shown in the illustration.

snaps in place. Note that there is no cushion on the cable (10).

mounted onto the support plate and the Type 2cable connected to PC 1777. The locking device (9) is visible between the support plate and PC 1777.

4 - 8 Service Manual Revision 02

SERVO-s Ventilator System Disassembling and assembling

Units with 'Replacement kit for PC 1777A–D'

!.

ServoS-9096

• Carefully release the cable (11) from the recess on PC 1777.

When assembling, make sure that the:

• Cushion (12) is attached to the EMC filter (13).

• EMC filter (13) is placed into the support plate recess.

• Retainer (14) is mounted correctly.

Backlight lamps

Using the Field Service System (FSS), a time meter for the lamps can be shown. This time meter must be reset after replacement of the lamps.

ServoS-9027

Type 1

66H

The Backlight lamp kit for TFT Display Type 1 includes two lamps. Always replace both lamps at the same time.

To access the Backlight lamps:

• Lift off the TFT Display. Refer to section 'TFT Display'.

• Remove the screws (1) holding the lamp.

• Lift off the lamp (2).

Type 2

On TFT Display Type 2, only one Backlight lamp is required.

To access the Backlight lamp:

• Lift off the TFT Display. Refer to section 'TFT Display'.

• Release the snap-in holder and pull out the lamp.

• Lift off the lamp (3).

ServoS-9097

Revision 02 Service Manual 4 - 9

Disassembling and assembling SERVO-s Ventilator System

Touch screen including frame

The illustration shows Type 1, but the procedure for Type 2 is the same.

To remove the Touch screen including frame (1):

• Lift off the TFT Display. Refer to section 'TFT Display'.

• Remove the Main rotary dial (2): – Pull off the Main rotary dial-knob. – Remove the nut holding the Main rotary dial. – Lift off the Main rotary dial.

• Remove the Direct access controls (3): – Remove the cover on each Direct access control-

ServoS-9040

69H

knob.

– Loosen the nut on each knob and pull off the

knobs.

– Remove the nut holding each Direct access

control and lift off the controls.

Note: When mounting the Main rotary dial and the Direct access controls on a new Touch screen incl. frame, make sure that the knobs are easy to turn.

ServoS-9028

Label strips

The Touch screen including frame is delivered with label strips which have to be mounted before the unit is taken into operation. Protective foils (1) separate the adhesive areas between the front panel film and the front panel.

Mount the label strips as follows:

• Select the two appropriate label strips: – One label strip for the Fixed keys on the upper

right-hand area, and

– One label strip for the Special functions keys on

the lower right-hand area of the User Interface.

Fixed keys label

• Insert the fixed keys label strip (2).

• Check its position through the button windows of the front panel film. Adjust if necessary.

Align the label strip with great care. Once installed the process cannot be reversed.

ServoS-9029

ServoS-9030

4 - 10 Service Manual Revision 02

SERVO-s Ventilator System Disassembling and assembling

• While holding the label strip in correct position,

remove the protective foils (3 and 4).

• Press the label strip against the adhesive area.

;

ServoS-9031

ServoS-9033

ServoS-9035

ServoS-9032

ServoS-9034

• Remove the protective foil (5).

• Press the front panel film (6) firmly against the front panel to ensure proper adhesion.

Special functions keys label

• Insert the Special functions keys label strip (7).

• Check its position through the button windows of the front panel film. Adjust if necessary.

Align the label strip with great care. Once installed the process cannot be reversed.

• While holding the label strip in correct position, remove the protective foils (8 and 9).

• Press the label strip against the adhesive area.

ServoS-9036

ServoS-9037

• Remove the protective foil (10).

• Press the front panel film (11) firmly against the front panel to ensure proper adhesion.





ServoS-9038

ServoS-9039

Revision 02 Service Manual 4 - 11

Disassembling and assembling SERVO-s Ventilator System

Membrane foil

Note: The membrane foil (1) can only be replaced on

User Interface of Type 1.

ServoS-9125

ServoS-9126

ServoS-9127

To replace the membrane foil:

• Separate the front panel section from the rear cover. Refer to section User Interface.

• Disconnect the membrane foil connector (2) from PC 1777.

• Remove the four Direct access knobs.

• Pull off the old membrane foil.

ServoS-9128

ServoS-9129

• Remove all remainings from the old membrane foil on the User Interface front panel. Clean the area for the membrane foil with ethanol or isopropanol.

ServoS-9130

• Carefully separate the old membrane foil and remove the label strip (3). The label strip must be used on the new membrane foil.

Note: The label strip is not included in the membrane foil spare part.

ServoS-9131

4 - 12 Service Manual Revision 02

SERVO-s Ventilator System Disassembling and assembling

When assembling the membrane foils adhesive parts, align the parts with great care. Once installed the process cannot be reversed.

• On the new membrane foil: – Carefully remove the protective foil (4). – Attach the front panel film (5) onto the membrane

button panel.

– Press the front panel film firmly against the

membrane button panel to ensure proper

ServoS-9132

adhesion.

• Remove the two remaining protective foils (6).

• Place the label strip (3) in correct position.

ServoS-9133

ServoS-9134

ServoS-9135

ServoS-9136

ServoS-9127

• Press the front panel film firmly against the membrane button panel to ensure proper adhesion.

• Remove the protective foils (7) and (8).

• Mount the membrane foil (1) onto the User Interface front panel.

• Press the membrane foil firmly against the front panel to ensure proper adhesion.

• Restore the User Inteface: – Mount the four Direct access knobs. – Connect the membrane foil connector to PC 1777.

Revision 02 Service Manual 4 - 13

Disassembling and assembling SERVO-s Ventilator System

Patient Unit

Main and side covers

The main cover and the side cover are secured with screws.

• Main cover screw (1).

• Side cover bayonet screws (2). To release or lock these screws, turn the screw 90° as shown in the illustration.

To open the Patient Unit main cover:

• Release the main cover screw (1).

• Pull the main cover (3) to stop.

The main cover is now partly open and the inspiratory section is accessible.

ServoS-9043

ServoS-9044

ServoS-9046

To remove the Patient Unit main cover:

• Open the main cover as described above.

• Press the latch (4) and slide off the main cover (3).

To remove the Patient Unit side cover:

• Release the side cover screws (2).

• Pull off the side cover (5).

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 the patient unit covers removed.

4 - 14 Service Manual Revision 02

SERVO-s Ventilator System Disassembling and assembling

Remove the User Interface from the Patient Unit

To remove the User Interface from the Patient Unit:

• Disconnect the Control cable at the Patient Unit.

• Open the main cover.

• While firmly holding the User Interface (1), loosen the screws (2).

• Lift off the User Interface.

ServoS-9042

Gas modules

To remove the gas modules:

• Open the main cover.

• Loosen the two screws holding the locking rail (1).

• Pull off the gas modules (2).

ServoS-9045

6 H

9;;

ServoS-9041

Revision 02 Service Manual 4 - 15

When assembling, make sure that the connector muff properly seals around the inspiratory pipe (3). The connector muff must not be pushed too far onto the nozzle units (4).

Disassembling and assembling SERVO-s Ventilator System

Battery modules

To remove the battery modules:

• Remove the main cover.

• Unscrew and remove the knob (3).

• Pull off the battery modules: – Battery module in slot 1 (1) – Battery module in slot 2 (2).

The battery modules to be used are the same as for SERVO-i.

ServoS-9048

Note: Replace both battery modules at the same time.

PC 1771 Control and PC 1772 Monitoring

ServoS-9050

69H

ServoS-9059

ServoS-9058

To remove PC 1771 and/or PC 1772:

• Remove the main cover.

• Release both locking devices at the PC board guides for the concerned PC board.

• Carefully pull out and lift off the concerned PC board:

– PC 1771 Control (1) – PC 1772 Monitoring (2).

Note: When replacing PC 1771 Control or PC 1772 Monitoring, it can be necessary to re-install the System SW. For further information, refer to section

'Replacing PC boards' in this chapter.

AC/DC Converter

To remove the AC/DC Converter:

• Remove the main cover.

• Remove the screws holding the AC/DC Converter: – Screws (1) at the mains inlet – Screws (2) inside the inspiratory section. Pull out

gas module to access the screws.

the O

– Screws (3) at the main cover rail.

ServoS-9060

• Carefully pull out the AC/DC Converter to make the cable connectors accessible.

• Disconnect the mains power cable (4) and the converter cable (5).

• Lift off the AC/DC Converter.

ServoS-9057

;

4 - 16 Service Manual Revision 02

SERVO-s Ventilator System Disassembling and assembling

PC 1863 Power control

To remove PC 1863:

• Remove the main cover.

• Remove the battery modules.

• Remove the screws (1) at the underside of the Patient Unit. These screws are accessible also with the SERVO-s mounted on a Mobile cart.

• Carefully pull out and lift off PC 1863 (2).

ServoS-9051

ServoS-9053

ServoS-9061

ServoS-9052

ServoS-9054

PC 1862 DC/DC & Standard connectors

To remove PC 1862:

• Remove the main cover.

• Remove the screws (1) on the rear panel.

• Carefully pull out and lift off PC 1862 (2).

PC 1860 Main back-plane

To remove PC 1860:

• Remove the main cover.

• Remove the: – Battery modules – PC 1771 Control – PC 1772 Monitoring – PC 1863 Power control – PC 1862 DC/DC & Standard connectors – Internal fan.

• Disconnect the converter cable (1).

• Remove the screws (2).

• PC 1784 Expiratory channel and PC 1861 Pneu-

H69H

matic back-plane is connected to the rear side of PC 1860. Carefully pull out and lift off PC 1860 (3).

Note: The ventilators System ID, 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. For further information refer to chapter 'Description of functions'.

Revision 02 Service Manual 4 - 17

Disassembling and assembling SERVO-s Ventilator System

Internal fan

To remove the internal fan:

• Remove the main cover.

• Remove PC 1862 DC/DC & Standard connectors (to make the internal fan cable connector accessible).

• Remove the internal fan filter.

• While holding the internal fan, remove the screws (1).

ServoS-9055

ServoS-9056

• Disconnect the internal fan cable connector (2)

• Lift off the internal fan.

Note: An arrow on the fan housing indicates the air flow direction. When mounting the fan, make sure that the cooling air flow is directed into the unit.

ServoS-9090

Inspiratory channel

Removal of the inspiratory channel, as well as removal of O in the User's manual.

Sensor and O2 cell/filter, is described

Safety valve membrane

To remove the safety valve membrane:

• Remove the inspiratory channel.

• Release the latches (1), one on each side of the safety valve housing, and lift off the membrane holder (2).

• The membrane (3) and the valve seat (4) are now accessible, e.g. for inspection and cleaning.

ServoS-9091

4 - 18 Service Manual Revision 02

SERVO-s Ventilator System Disassembling and assembling

PC 1861 Pneumatic back-plane

To remove PC 1861:

• Remove the main cover.

• Remove PC 1860 Main back-plane. (PC 1861 cannot be removed with PC 1860 mounted.)

• Remove the inspiratory channel including filter for the inspiratory pressure transducer.

• Remove the screws (1).

• Carefully lift the mounting plate (2) and disconnect

Sensor/cell connector and the safety valve

the O

pull magnet connector from PC 1861.

• Lift off the mounting plate (2). The safety valve pull

ServoS-9063

ServoS-9064

;

magnet is mounted on this plate.

• Pull out the gas modules to disconnect them from PC 1861.

• Remove the threaded studs (3).

• Lift off PC 1861 (4).

Note: When assembling, the mounting plate (2) must be adjusted to correspond with the inspiratory channel latches.

ServoS-9065

;

PC 1784 Expiratory channel

To remove PC 1784:

• Remove the side cover.

• Disconnect the: – Inspiratory pressure transducer tube (1) – PC 1785 cable connector (2) – Expiratory pressure transducer tube (3) – Expiratory valve coil cable connector (4).

• Release PC 1784 from the standoffs (5).

• Carefully pull out and lift off PC 1784 (6).

Note: When replacing PC 1784 Expiratory channel,

<<=

it can be necessary to re-install the System SW. For further information, refer to section 'Replacing PC boards' in this chapter.

Revision 02 Service Manual 4 - 19

Disassembling and assembling SERVO-s Ventilator System

PC 1785 Expiratory channel connector

ServoS-9066

ServoS-9067

ServoS-9068

66H

;

To remove PC 1785:

• Remove the side cover.

• Disconnect the PC 1785 cable connector (1).

• Remove the screws (2).

• Pull down and lift off PC 1785 (3).

Note: When assembling, make sure that the rubber seal (4) is correctly seated around PC 1785.

Expiratory valve coil

To remove the expiratory valve coil:

• Remove the side cover.

• Disconnect pressure transducer tubes and cable connectors from PC 1784. Refer to section 'PC 1784 Expiratory channel'.

• Remove the screws (1).

• Lift off the cassette compartment (2).

ServoS-9069

• Remove the screws (3).

• Lift off the expiratory valve coil (4).

ServoS-9070

99;

4 - 20 Service Manual Revision 02

SERVO-s Ventilator System Disassembling and assembling

Expiratory cassette membrane

It is very important for the function of the expiratory valve that the valve membrane is removed and mounted correctly as described below.

The expiratory cassette is a complete unit and must not be disassembled. The only part that can be replaced is the valve membrane.

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.

Note: If the metal washer has been separated from the membrane, it is important that the washer is correctly mounted.

• Washers of old version have a raised hub (1) that must be facing outwards as shown in the adjacent illustration.

• Washers of new version do not have this raised hub and can be mounted in both directions.

ServoS-9107

ServoS-9071

To remove the valve membrane from the cassette:

• Carefully remove the membrane including retaining ring using a suitable retaining ring pliers.

To mount the valve membrane into the cassette:

• Place the retaining ring (2) correctly into the membrane.

It is very important that the valve membrane and the membrane seat in the cassette is clean. Dirt particles can create leakage in the cassette.

ServoS-9072

Revision 02 Service Manual 4 - 21

Disassembling and assembling SERVO-s Ventilator System

• Place the membrane onto the cassette as shown in the illustration.

ServoS-9071

• Squeeze the retaining ring pliers and carefully press the membrane in place into the cassette as shown in the illustration.

ServoS-9074

ServoS-9073

ServoS-9075

• Carefully release and remove the pliers.

• Check that the membrane is not deformed by the retaining ring. If necessary, remove the membrane and redo the complete mounting procedure.

• Mount the expiratory cassette onto the Patient Unit.

• Reset the operating capacity meter after replacement of the membrane. To access the reset button, select Menu / Biomed / Service.

Control cable

The control cable connectors must be connected carefully to avoid damages on the connector pins.

• Carefully find the correct position; the connector pins and the guides in the connectors must correspond. Do not turn the connector while inserting!

• When correct position is found, insert the connector.

• Secure the connector with its locking ring.

The illustration shows the Patient Unit connector, but the procedure for the User Interface connector is the same.

Note: The Control cable must only be connected or disconnected when the ventilator is switched Off.

4 - 22 Service Manual Revision 02

SERVO-s Ventilator System Service procedures

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.

5. Service procedures

Battery modules ................................................ 5 - 2

Replacing the lithium batteries on

PC 1771 and PC 1772 ...................................... 5 - 3

Using the Menu and Biomed key...................... 5 - 4

Menu ............................................................... 5 - 4

Biomed ........................................................... 5 - 4

Software installation .......................................... 5 - 6

General ........................................................... 5 - 6

Software information ...................................... 5 - 6

Software delivery ............................................ 5 - 6

Software installation procedure ..................... 5 - 6

Field Service System ......................................... 5 - 6

General ........................................................... 5 - 6

Field Service System functions ..................... 5 - 6

Revision 02 Service Manual 5 - 1

Service procedures SERVO-s Ventilator System

Battery modules

System SW version V2.01.00 (or higher) includes an improved monitoring of the battery status. Select 'Status / Batteries' on the User Interface to check battery status. Refer to the illustrations below.

On ventilators with this improved battery monitoring, the batteries condition and capacity are verified during the Pre-use check and also continuously during operation of the unit. No further functions checks of the batteries are required.

With this improved battery monitoring, the Battery status window shows:

• Usable backup time. Calculated as the sum of the estimated backup time for the connected Battery modules reduced with 10 minutes as an extra safety feature.

• Slot number. Note that slot 1 is the lower slot and slot 2 is the upper.

• Battery module S/N.

• Charge indicator for each battery, where: 0 boxes filled = < 10% relative charge 1 box filled = 10–25% relative charge 2 boxes filled = 26–50% relative charge 3 boxes filled = 51–75% relative charge 4 boxes filled = 76–100% relative charge

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.

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 modules.

• Remaining operating time in minutes for each battery.

Furthermore, an activity instruction, displayed directly next to the operating time, may show:

• Expires soon. Message activated if expiry date will be reached within 60 days.

• Replace battery. The battery must be replaced and discarded. Message activated if:

– The batteries expiry date is passed and its life

span is exceeded. Note: Due to the age of the battery, the calculated backup time may in this case not be reliable. Even if the battery indicates a significant backup time, the battery must be replaced.

– The batteries operational capacity is too poor for

continued usage, caused e.g. by the chemical process in an aging battery.

Manufacturing date = YYWW

(YearWeek)

Version 1 Version 2 Version 3

Batteri Module

Part No:. 64 87 180 E407E Manufacturing Date: 0245

Hardware Version: xxxxx

ServoS-9101

ServoS-9099ServoS-9100

Manufacturing Date : Hardware Revision : Batch No :

0420 xxxxx xxxxx

Man. Date : 0520

S N xxxxx

5 - 2 Service Manual Revision 02

SERVO-s Ventilator System Service procedures

Replacing the lithium batteries on PC 1771 and PC 1772

The lithium batteries must be replaced after 5 years. A Technical error message will appear on the screen if the battery voltage level is too low.

Always replace both batteries at the same time to keep the same replacement date for both batteries.

Preparations

• Set the On/Off switch on the control unit to Off.

• Disconnect the mains power cable.

• Disconnect the gas supplies (wall and/or cylinder).

• Remove patient tubing.

Replacing the lithium battery

• The lithium batteries are mounted on ESD sensitive PC boards. Refer to chapter 'Disassembling and assembling', section 'Handling PC boards' for further information regarding ESD sensitive components.

• Remove the Patient Unit main cover. Refer to chapter 'Disassembling and assembling'.

• Carefully pull out PC 1771 and PC 1772.

ServoS-9078

;

• There are two equal battery connectors (2 and 3)

• Cut the cable ties holding the old battery (4) to the

• Disconnect and remove the old battery.

• Mount the new battery onto the PC board using

• Insert the PC board into the correct PC-board slot

After any maintenance or service of the SERVO-s, perform a 'Pre-use check'. Refer to the 'SERVO-s Ventilator System – User's Manual'.

Do not remove the cable connector (1).

Note: Information stored in the PC board memory will be erased if the connector is removed:

– If the battery on PC 1771 is disconnected;

user default configurations made via the Field Service System (FSS) and Pre-use check results including transducer calibrations will be erased.

– If the battery on PC 1772 is disconnected;

all trends, all logs and Pre-use check results including transducer calibrations will be erased.

on the PC boards. Connect the new battery to the un-used connector. The memory functions are now secured by the new battery.

PC board.

new cable ties as shown in the illustration.

and reassemble the Patient Unit.

Revision 02 Service Manual 5 - 3

Service procedures SERVO-s Ventilator System

Using the Menu and Biomed key

The 'Menu' and 'Biomed' functions are useful tools during service.

The adjacent flowchart shows the 'Biomed' functions in System version V3.1. A complete set of flowcharts showing all 'Keys' and 'Screen touch pad' functions can be found in the 'SERVO-s Ventilator System – User's Manual'.

Biomed

Service

Event log

Alarms

Ventilator settings

Apnea periods

Functions

Latest

Time selection

Service log

Technical alarms

Test results

Preventive Maintenance

Service report history

Installation log

Latest

Time selection

Report PM

Replaced Exp

membrane

Edit

configuration

Alarm

sound level

Alarm

limits

Displayed

values

NIV

alarms

Startup

configuration

Copy

configuration

Set date

and clock

Enter code 1973 to access the Biomed menues.

Display Event logs.

Possible selections:

• Latest logs

• Selected time interval

Display Service logs.

Possible selections:

• 21 latest logs

• Selected time interval

Enters date for a performed Preventive Maintenance into the Service Log. Setting time stamp until next PM.

Reset of breath counter in expiratory cassette.

User default configuration setup.

Copy configuration to / from PC Card.

Date and time setup.

Pressing the fixed key 'Menu' will open the 'Menu window' on the User Interface.

The 'Menu' is active in Standby and during ventilation mode, but the available submenus differs.

Possible selections in the 'Menu' window are:

• Alarm

• Review

• Complience compensation

• Biomed

• Panel lock

Biomed

Submenu 'O2 cell adaptation', active only during ventilation modes in units with O code is required.

All other 'Biomed' submenus are available only during Standby and requires an access code. The default code is 1973, but the code can be changed in the Biomed menu.

Service

Available only in Standby mode.

Event Log: Displays Event logs. Useful during troubleshooting.

Service Log: Displays Service logs. Useful during troubleshooting.

Report PM: This button must be pressed when a Preventive

Maintenance has been performed. This will reset the timer that indicates operating hours until next Preventive Maintenance. Default value is 5,000 hours. In the Report PM submenu, it is possible to enter a new value, e.g. if the time stamp was erased during a SW installation.

cell. No access

ServoS-9092

Change

access code

cell

adaptation

Change access code to Biomed menu.

Measured O2 concentration will be adapted in

relation to set value.

5 - 4 Service Manual Revision 02

SERVO-s Ventilator System Service procedures

Replaced Exp membrane: This button must be pressed when the Expiratory

cassette membrane has been replaced. This will reset the operating capacity meter (breath counter) in the expiratory cassette.

Edit configuration

Available only in Standby mode.

Alarm sound level Default alarm sound level can be changed in this

window.

Alarm limits Default invasive alarm limits can be changed in this

window:

• Pressure – Upper alarm limit

• Minute Volume – Lower and Upper alarm limit

• Respiratory Rate – Lower and Upper alarm limit

• End Exp. Pressure – Lower and Upper alarm limit

• Apnea time – Upper alarm limit. Default configuration regarding 'General' and 'Units'

cannot be changed in this window. Access to the Field Service System (FSS) is required.

Startup configuration Requires Software Version 3. Startup configuration

can be changed in this window:

• Type of ventilation

• Volume setting

• Breath Cycle setting

• Pre-post oxygenation conc. above set O

conc.

Copy configuration

Available only in Standby mode. Default user configuration can be copied to / from a

PC Card. Default configuration regarding 'General', 'Units' and

'Alarm limits' will be copied. Useful when applying the same user configuration on

a number of units.

Set date and clock

Available only in Standby mode. Date and time setting can be changed in this

window.

Displayed values The Measured value boxes on the User Interface

shows different parameters. Some of these parameters are fixed and some are selectable in this window.

NIV alarms Default NIV alarms can be changed in this window:

• Pressure – Upper alarm limit

• Minute Volume – Lower and Upper alarm limit

• Respiratory Rate – Lower and Upper alarm limit

• End Exp. Pressure – Lower and Upper alarm limit The alarms listed above, except Pressure alarm, can

be permanently silenced in this window. Default configuration regarding 'General' and 'Units'

cannot be changed in this window. Access to the Field Service System (FSS) is required.

Change access code

Available only in Standby mode. Access code to the 'Biomed' menu can be changed

in this window.

cell adaptation

Available only during ventilation in units with O Adjustment of the O

concentration reading.

cell.

Refer to the 'SERVO-s Ventilator System – User's Manual' for further information.

Revision 02 Service Manual 5 - 5

Service procedures SERVO-s Ventilator System

Software installation

General

• Before starting any SW Upgrade or Update, check: – Installed System SW version (see 'System SW

version' in the Status / General window)

– System SW version stored on the PC Card.

not recommended to install System SW with

It is lower version number than already installed in the SERVO Ventilator System.

• 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

Software information

There are two different intentions for software installation:

SW Update

A SW Update will install a new System SW version in the SERVO Ventilator System. SW Updates are not dependent on the serial number of the ventilator and will not alter the installed SW Options.

SW Upgrade

A SW Upgrade will change the function of the SERVO Ventilator System. A SW Upgrade is individually created for each ventilator and can only be installed on this ventilator. S/N of the ventilator must be stated when ordering a SW Upgrade.

SW Upgrade

Option Upgrade

All System versions

– User's Manual'.

SW Option SW Option

SW Option

SW Option SW Option

SW Update

Software delivery

SW Updates and SW Upgrades can be downloaded from the 'MCC SW Download' website or delivered via freight on a PC Card.

• SW Updates are not dependent on the S/N of the ventilator and can thus be installed on any unit.

• SW Upgrades are specific for each ventilator and can only be installed on this unit. SW Upgrades must thus be ordered and created in factory before they can be available on the website or delivered on a PC Card.

Software installation procedure

Further information regarding the different softwares and the software installation procedure can be found in the 'SERVO-i / SERVO-s Software – Installation Instructions'.

Field Service System

General

• The Field Service System (FSS) is a software provided to facilitate troubleshooting, service and maintenance of the SERVO Ventilator System.

• To access the Field Service System, a Service card (PC Card) and an access code must be used. The access code is unique for each Service card.

• The Service card is personal and handed-over to anyone else.

• It is only possible to access the Field Service System with the ventilator in Standby mode.

• The Field Service System must not be activated with a patient connected the ventilator.

must not be

Major

function

improvement

Software Version

System version V3.0 or higher

ServoS-9105

5 - 6 Service Manual Revision 02

Corrections

and minor

function

improvement

SW Service Release

System version V3.0 or higher

Field Service System functions

In the Field Service System, it is possible to:

• Display information regarding the ventilator including options and parts installed.

• Calibrate the internal barometer.

• Display service and event logs.

• Run complete or selected test sequences.

System SW Update

System version V1.0 - V2.1

• Create and save service reports.

• Export selected logs to a PC Card.

• Create user default configurations.

SERVO-s Ventilator System Troubleshooting

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.

6. Troubleshooting

General .............................................................. 6 - 2

Pre-use check ................................................... 6 - 3

Technical error codes........................................ 6 - 11

Revision 02 Service Manual 6 - 1

Troubleshooting SERVO-s Ventilator System

Possible causes to malfunction not mentioned in the following troubleshooting guides are:

• The system has not been correctly assembled

after cleaning, maintenance or service.

• Disconnection or bad connection in cable

connectors, PC board connectors, and interconnection boards.

• Disconnected or defective gas tubes. These possible causes to malfunction must

always be considered during troubleshooting.

General

Before starting troubleshooting, try to eliminate all possibilities of operational errors. If the malfunction remains, use the troubleshooting guides below as well as the information in chapter 'Description of functions' to locate the faulty part. Perform actions step by step and check that the malfunction is eliminated.

When the fault is corrected, carry out a complete 'Pre-use check' as described in the 'SERVO-s Ventilator System – User's Manual'.

The troubleshooting guides below are focused only on technical problems. Information about clinical related problems can be found in the 'SERVO-s Ventilator System – User's Manual'.

For functionality enhancement, the latest released System SW version is always recommended.

The Information in this chapter applies to System version V3.1 (or higher).

6 - 2 Service Manual Revision 02

SERVO-s Ventilator System Troubleshooting

Pre-use check

The SERVO-s demands the user to start the automatic Pre-use check at every startup of the unit. It is also possible to select the Pre-use check via the Standby menu.

The 'SERVO-s Ventilator System – User's Manual' describes how to perform this Pre-use check. The Pre-use check-description on the following pages gives more detailed information about the Pre-use check. This information can be used e.g. during troubleshooting of the unit.

* Text within brackets refers to the tested subsystem; BRE = Breathing, MON = Monitor, PAN = Panel.

Test Test description * Recommended action if the test fails

During system startup.

Internal technical tests:

• SW check

• Reading EEPROM

• Checksum EEPROM

• Panel button stuck test

• Audio test.

(BRE + MON + PAN)

Some of the recommended actions described below refer to the Field Service System (FSS). The Service card is required to access the FSS. Troubleshooting can of course be performed without access to the FSS, but for some of the recommended actions, the FSS will make troubleshooting faster and easier.

Check if the fault remains after each performed service action. Re-run the complete Pre-use check or run the concerned test using the FSS.

Via the Standby menu it is possible to perform a separate Patient circuit test to evaluate circuit leakage and measure circuit compliance. This test does not replace the complete Pre-use check.

1. Restart the unit. Do not touch the User Interface during system startup. Interfering with the knobs, keys, touch screen, loudspeaker grid, etc, may affect the internal technical tests.

2. Reinstall the System SW.

Start Pre-use check

Internal tests

Revision 02 Service Manual 6 - 3

Audio test. (MON + PAN)

Alarm output connector test. Performed only if this option is

installed. (MON)

Power failure test. (MON)

If possible, check the ‘Test results’-log in the ‘More detailed’ mode (FSS).

If the audio test failed:

1. Make sure that the Patient Unit main cover and the User Interface rear cover are correctly mounted. Otherwise the audio tests may fail.

2. Check in the Test results-log (FSS) if it was the Panel test or the Monitoring test that failed:

• If the Monitoring test failed:

Replace PC 1772 Monitoring.

• If the Panel test failed:

Replace the loudspeaker or PC 1777 Panel.

Troubleshooting SERVO-s Ventilator System

Test Test description * Recommended action if the test fails

Internal tests (continued)

Barometer test Checks that the barometric pressure

measured by the internal barometer is within 630–1080 hPa.

Checks that the measured barometric pressure values differs less than 8 hPa between BRE and MON.

(BRE + MON)

If the Alarm output connector test failed:

1. Replace PC 1862 DC/DC & Standard Connectors.

2. Replace PC 1772 Monitoring

If the power test failed:

1. Replace PC 1772 Monitoring.

Check the Barometric pressure value in the Status window:

If that value is within 630–1080 hPa:

1. Replace PC 1771 Control

2. Replace PC 1772 Monitoring

3. Replace PC 1784 Expiratory channel

4. Replace the gas modules. Replace one gas module at a time.

If that value is outside 630–1080 hPa:

Gas supply pressure test

Checks that the gas supply pressures (Air and O

) measured by the internal

gas supply pressure transducers are within 200–650 kPa (2.0–6.5 bar).

Checks that the measured supply gas pressure values differs less than 20 mbar between MON and BRE.

(BRE + MON)

1. Replace PC 1772 Monitoring.

1. Check that the connected gas supply pressure (Air and O

) is

within the specified range.

2. Start the unit in a ventilation mode and check the alarms:

• If an Air supply pressure-alarm

is activated, replace the Gas module Air.

• If an O

supply pressure-alarm

is activated, replace the Gas module O

3. Replace PC 1771 Control.

4. Replace PC 1772 Monitoring.

6 - 4 Service Manual Revision 02

SERVO-s Ventilator System Troubleshooting

Test Test description * Recommended action if the test fails

Internal leakage test Checks the internal leakage, with test

tube connected, using the inspiratory and expiratory pressure transducers.

Checks that the leakage at 80 cm H is max. 10 ml/min.

Checks that the measured pressure values differs less than 5 cm H between Insp. and Exp.

(BRE)

If message ‘Leakage’ or ‘Excessive leakage’ appears:

1. Check that the test tube is

correctly connected.

2. Check the expiratory cassette:

• Check that the cassette is

correctly seated in the cassette compartment.

• If possible, replace the

expiratory cassette and check if the new cassette is accepted by the Pre-use check.

• If the new cassette was

accepted by the Pre-use check, the fault was located to the cassette. To repair the old cassette, check that the expiratory valve membrane is clean and correctly seated in the cassette. Replace the membrane if required.

3. Check that the pressure transducer tubes/filters are correctly mounted.

4. Check the inspiratory section:

• Check that the inspiratory pipe

is correctly mounted in the inspiratory section.

• Check that the safety valve

membrane is clean and correctly seated in the inspiratory pipe.

• Check that the safety valve

closes properly when the Preuse check is started (distinct clicking sound from the valve). If the safety valve opens during this test, the opening pressure may not be correctly calibrated (see ‘Safety valve test’ below). Run the ’Safety valve test’ and repeat the complete Pre-use check.

Revision 02 Service Manual 6 - 5

Troubleshooting SERVO-s Ventilator System

Test Test description * Recommended action if the test fails

Internal leakage test (continued)

If message ‘Pressure Transducer

difference > 5 cm H

1. Check that the pressure transducer tubes and the inspiratory filter are correctly mounted.

2. Check that both PC 1781 Pressure transducer (Insp. and Exp.) are correctly mounted.

3. If the ‘Pressure transducer test’ also fails (see below), refer to the recommended actions if ‘Pressure transducer test’ failed.

If message ‘System volume too small’ appears:

1. Replace the gas modules. Replace one gas module at a time.

If message ‘System volume too large’ appears:

1. Check that the correct test tube is used during the Pre-use check.

O’ appears:

2. If the ‘Flow transducer test’ also fails (see below), replace the gas modules. Replace one gas module at a time.

3. Refer to troubleshooting as described for ‘Leakage’ or ‘Excessive leakage’ above.

6 - 6 Service Manual Revision 02

SERVO-s Ventilator System Troubleshooting

Test Test description * Recommended action if the test fails

Pressure transducer test

Calibrates and checks the inspiratory and expiratory pressure transducers.

The new zero value for the pressure transducers may not differ more than ±6 cm H

With the inspiratory pressure transducers used as a reference, a new gain factor is set for the expiratory pressure transducer. The new gain factor may not differ more than ±5% from factory calibration.

During this test, the different subsystems concerned are compared. The difference between the subsystems must not be more than ±1 cm H

Expiratory valve coil test. Measures offset and gain in the valve coil.

(BRE + MON)

O from factory calibration.

O at 60 cm H2O.

Check the ‘Test results’-log in the ‘More detailed’ mode. (FSS)

If ‘Pressure transducer test’ failed:

1. Check the expiratory cassette:

• If possible, replace the

expiratory cassette and check if the new cassette is accepted by the Pre-use check.

• If the new cassette was

accepted by the Pre-use check, the fault was located to the cassette. The fail with the old cassette may in this case be due to water collected at the pressure transducer filter inside the cassette. Dry the old cassette properly.

2. Check/replace PC 1781 Pressure transducer (Insp. and Exp.). To locate the faulty pressure transducer, replace one transducer at a time.

3. Replace PC 1771 Control.

4. Replace PC 1772 Monitoring.

If ‘Expiration valve test’ failed:

1. Check the expiratory cassette:

• If possible, replace the

expiratory cassette and check if the new cassette is accepted by the Pre-use check.

• If the new cassette was

2. Replace the Expiratory valve coil.

Revision 02 Service Manual 6 - 7

Troubleshooting SERVO-s Ventilator System

Test Test description * Recommended action if the test fails

Safety valve test Checks and if necessary adjusts the

opening pressure for the safety valve to 117 ±3 cm H

Checks the hardware signals related to the safety valve functions.

(BRE + MON)

O2 cell/sensor test Calibrates and checks the O2 Sensor/

cell at 21% O Checks if the O

and 100% O2.

cell is worn out.

As different gas mixtures are used during this test, calibration and check

Sensor/cell will not be performed

of O

if one gas is missing. The O

Sensor test requires 21% O2

and 100% O used (e.g. O instead of 100%) the O

. If other gas mixtures are

supply delivers 96% O2

cell/sensor test

may fail.

1. Check the inspiratory section:

• Check that the inspiratory pipe

is correctly mounted in inspiratory section.

• Check that the safety valve

membrane is clean and correctly seated in the inspiratory pipe.

2. Replace the safety valve pull magnet.

3. Replace PC 1784 Expiratory channel.

4. Replace PC 1772 Monitoring.

1. Check that the connected gas supply pressure (Air and O

) is

within the specified range.

2. Replace the O

Sensor/cell.

3. Replace the gas modules. Replace one gas module at a time.

4. Replace PC 1771 Control.

5. Replace PC 1772 Monitoring.

(BRE + MON)

6 - 8 Service Manual Revision 02

SERVO-s Ventilator System Troubleshooting

Test Test description * Recommended action if the test fails

Flow transducer test

Checks the inspiratory flow transducer. Calibrates and checks the expiratory flow transducer.

Calibrates at 60% O 100% and 21% O

and checks at

. As different gas

mixtures are used during this test, calibration of the expiratory flow transducer will only be performed if both gases are connected. The check using the connected gas, (100% alt. 21% O

) will however be performed.

The ‘Flow transducer test’ will pass if the result of this check corresponds to the old calibration factor from a previous Pre-use check. The same expiratory cassette must be used.

The new calibration factor for the expiratory flow transducer may not differ more than -10% to +15% from factory calibration.

During this test, the different subsystems concerned are compared. The difference between the subsystems must not be more than ±0.3 l/min.

(BRE + MON)

1. Check that the connected gas supply pressure (Air and O

) is

within the specified range.

2. Check the expiratory cassette:

• Check that the cassette is

correctly seated in the cassette compartment.

• If possible, replace the

expiratory cassette and check if the new cassette is accepted by the Pre-use check.

• If the new cassette was

accepted by the Pre-use check, the fault was located to the cassette. The fail with the old cassette may in this case be due to water collected inside the cassette. Dry the old cassette properly.

3. Replace the gas modules. Replace one gas module at a time.

4. Replace PC 1785 Expiratory channel connector.

5. Replace PC 1771 Control.

Battery switch test Checks that the power supply switches

to battery when mains power is disconnected.

Checks that the power supply switches back to mains power when reconnected.

This test will not be performed if:

• Less than 10 min. backup time

remains in the internal battery.

(MON)

6. Replace PC 1772 Monitoring.

7. Replace PC 1784 Expiratory channel.

1. Check that the total remaining time for the internal battery is >10 min. If not, allow the internal battery to charge and repeat the test.

2. Replace PC1863 Power control.

3. Replace the battery modules. Always replace both battery modules at the same time.

Revision 02 Service Manual 6 - 9

Troubleshooting SERVO-s Ventilator System

Test Test description * Recommended action if the test fails

Patient circuit test

Alarm state test Checks that no Technical error alarms

External alarm system test

Checks the patient circuit leakage, with patient tubing connected, using the inspiratory and expiratory pressure transducers.

Checks that the leakage at 50 cm H is max. 80 ml/min.

Will allow the system to calculate a compensation for circuit compliance (if the leakage requirements are met).

(BRE)

are active during the Pre-use check. (MON)

If the option Alarm Output Connector is enabled, the user can test the external alarm system.

The external alarm output signal is activated and the user must verify the external alarm.

If the internal leakage test (see above) has passed, the leakage is to be located to the patient circuit. Check for leakage or replace the patient circuit.

Refer to section regarding Technical error alarms for further information.

1. Check the external alarm system.

2. Replace PC 1862 DC/DC & Standard Connectors.

The result of the test does not affect the outcome of the Pre-use check

Test Test description * Recommended action if the test fails

Separate Patient circuit test.

This test separately performs the Patient circuit test as described above.

See above

6 - 10 Service Manual Revision 02

SERVO-s Ventilator System Troubleshooting

Technical error codes

The table below shows recommended actions in case of Technical error alarms.

Error code

Error message / Possible cause Recommended action

Some of the Error codes are intended only for R&D, not for field service. If so, the text ‘N/A’ is stated in the ‘Recommended action’-column.

Monitoring

1 POWER_FAILURE_MINUS_12_VOLTS_

TOO_LOW (i.e. < -13.2 V)

2 POWER_FAILURE_MINUS_12_VOLTS_

TOO_HIGH (i.e. > -10.8 V)

3 POWER_FAILURE_12_VOLTS_TOO_LOW 1. Check status of external battery

1. Replace PC 1862 DC/DC & Standard Connectors.

1. Check status of external battery (if connected).

2. Replace PC 1862 DC/DC & Standard Connectors.

3. Replace PC 1863 Power control.

(if connected).

2. Replace PC 1862 DC/DC & Standard Connectors.

3. Replace PC 1863 Power control.

4 POWER_FAILURE_12_VOLTS_TOO_HIGH 1. Replace PC 1862 DC/DC & Standard

Connectors.

5 POWER_FAILURE_24_VOLTS_TOO_LOW 1. Replace PC 1862 DC/DC & Standard

Connectors.

2. Replace the gas modules. Replace one gas module at a time and check that this technical error code will not appear.

6 POWER_FAILURE_24_VOLTS_TOO_HIGH 1. Replace PC 1862 DC/DC & Standard

Connectors.

7 INSP_VALVE_RANGE_ERR 1. Replace PC 1771 Control.

2. Replace PC 1772 Monitoring.

3. Replace the gas modules. Replace one gas module at a time and check that this technical error code will not appear.

8 TECH_ERR_INSP_PAUSE_HOLD_TIME_

EXCEEDED

9 TECH_ERR_EXP_PAUSE_HOLD_TIME_

EXCEEDED

1. Replace PC 1771 Control.

Revision 02 Service Manual 6 - 11

Troubleshooting SERVO-s Ventilator System

Error code

Error message / Possible cause Recommended action

10 VALVES_DISABLED 1. Replace PC 1784 Expiratory channel.

2. Replace PC 1771 Control.

3. Replace PC 1862 DC/DC & Standard Connectors.

4. Replace PC 1772 Monitoring.

11 SAFETY_VALVE_OPEN 1. Check inspiratory channel.

2. Replace safety valve pull magnet.

3. Replace PC 1784 Expiratory channel.

12 BRE_NODE_DISCON 1. Replace PC 1771 Control.

2. Replace PC 1862 DC/DC & Standard Connectors.

13 BRE_NODEID_CONFLICT N/A 14 PANEL_NODE_DISCON 1. Check the control cable

2. Replace PC 1777 Panel.

3. Replace PC 1862 DC/DC & Standard Connectors.

Note: This error indicates communication failure between PC 1777 and PC 1772 and the error code will thus not be shown on the display (but

will be logged). 15 PANEL_NODEID_CONFLICT N/A 16 EXP_FLOW_MTR_NODE_DISCON 1. Replace PC 1784 Expiratory channel. 17 EXP_FLOW_MTR_NODEID_CONFLICT N/A 18 N/A N/A 19 N/A N/A 20 N/A N/A 21 N/A N/A 22 BUZZER_SILENCER 1. Replace PC 1772 Monitoring. 23 N/A N/A 24 BACKUP_CAP_ERR_MON 1. Replace PC 1772 Monitoring

6 - 12 Service Manual Revision 02

SERVO-s Ventilator System Troubleshooting

Error code

Error message / Possible cause Recommended action

25 TECH_MON_DEVICE_COMM_ERR Depending on ID #.

If repeated, replace parts as follows:

0: Report to MCC HSC for further information.

1: PC 1772 Monitoring.

2: PC 1863 Power control.

3: PC 1862 DC/DC & Standard Connectors.

4: PC 1781 Inspiratory pressure transducer.

5: PC 1781 Expiratory pressure transducer.

6: O2 Sensor/cell or O2 cell Sensor/cable or

PC 1772 Monitoring.

32: PC 1784 Expiratory channel or PC 1772

Monitoring. 33: Gas module Air or PC 1772 Monitoring. 34: Gas module O2 or PC 1772 Monitoring. 35: PC 1772 Monitoring. 256: PC 1771 Control. 512: PC 1777 Panel. 784: N/A

27 TECH_ERR_BUZZER_FAILURE 1. Replace PC 1772 Monitoring.

Note: If the Patient Unit main cover is removed, this error may be activated.

28 PANEL_AUDIO_FAIL 1. Replace the loudspeaker.

2. Replace PC 1777 Panel. Note: If the User Interface rear cover is removed,

this error may be activated.

29 LITHIUM_BATTERY_LOW 1. Replace battery on PC 1772 Monitoring. 32 ALARM_ID_MISMATCH N/A 33 BRE_NODE_CONNECT_TIMEOUT 1. Replace PC 1771 Control. 34 PANEL_NODE_CONNECT_TIMEOUT 1. Check the control cable.

2. Replace PC 1777 Panel.

3. Replace PC 1862 DC/DC & Standard

Connectors.

Note: This error indicates communication failure between PC 1777 and PC 1772 and the error code will thus not be shown on the display (but will be logged).

Revision 02 Service Manual 6 - 13

Troubleshooting SERVO-s Ventilator System

Error code

Error message / Possible cause Recommended action

35 EXP_FLOW_MTR_NODE_CONNECT_TIME-

OUT 36 N/A N/A 37 EXP_FLOW_MTR_RANGE_ERR N/A

38 BARO_UPPER_LIMIT_EXCEEDED 1. Check/calibrate barometer.

39 BARO_LOWER_LIMIT_EXCEEDED

40 INVALID_METRIC N/A 41 REAL_TIME_CLOCK_ERR 1. Replace PC 1772 Monitoring. 42 PERSISTENT_CHECKSUM_ERR

43 POWER_COMM_ERR

44 ALARM_LIM_XOR_ERR

45 ABNORMAL_SHUTDOWN

46 REMOTE_ALARM_ERR

47 FIXED_BATTERY_MISSING

1. Replace PC 1784 Expiratory channel.

2. Replace PC 1772 Monitoring.

1. Check/calibrate barometer.

2. Replace PC 1772 Monitoring. Note: This alarm will be activated if the ambient

pressure is below 650 hPa, e.g. on a high altitude.

1. Restart the unit.

2. Replace PC 1772 Monitoring (if not Error code 29).

1. Replace the battery modules. Always replace both battery modules at the same time.

2. Replace PC 1863 Power control.

3. Replace PC 1772 Monitoring.

1. Restart the unit.

2. Replace PC 1772 Monitoring (if not Error code 29).

1. Restart the unit and run a Pre-use check.

2. Replace PC 1772 Monitoring.

1. Replace PC 1862 DC/DC & Standard Connectors.

2. Replace PC 1772 Monitoring.

1. Check that the internal battery modules are properly connected.

2. Replace the battery modules. Always replace both battery modules at the same times

3. Replace PC 1863 Power control.

4. Replace PC 1772 Monitoring.

48 PRE_OXYGEN_PHASE_TOO_LONG 1. Replace PC 1771 Control. 49 DISCONNECT_PHASE_TOO_LONG 1. Replace PC 1771 Control. 50 BACKPLANE_EEPROM_INVALID 1. Replace PC 1772 Monitoring.

2. Replace PC 1860 Main back-plane.

6 - 14 Service Manual Revision 02

SERVO-s Ventilator System Troubleshooting

Error code

Error message / Possible cause Recommended action

Breathing

10001 BATTERY_MIN_VOLTAGE 1. Replace battery on PC 1771 Control. 10002 BRE_I2C_ERROR 1. Replace PC 1771 Control. 10003 BRE_FATAL_MEMORY_ERROR 1. Restart the unit.

2. Replace PC 1771 Control.

Panel

20001 PANEL_DEVICE_ERROR 1. Replace PC 1777 Panel. 20002 PANEL_BACKLIGHT_BROKEN

This error message may also be logged immediately before the ‘No battery capacity’ alarm when the unit is running in battery mode.

If the display is lit (and the error code is shown on the display):

1. Replace PC 1777 Panel.

If the display is not lit (the display is dark):

1. Replace backlight lamps.

2. Replace PC board Backlight Inverter.

Note: If one of the lamps is broken, the other lamp will automatically be switched off. Thus, with a failure on a backlight lamp, or likely also on PC board Backlight Inverter, the User Interface display will become dark. This error code will in such case not be possible to see (but will be logged).

20003 PANEL_BUTTON_STUCK 1. Restart the unit. Do not touch the User

Interface during system startup. Interfering with the knobs, keys, touch screen, loudspeaker grid, etc, may affect the internal technical tests.

2. Check the user interface membrane buttons (FSS).

3. Replace the touch screen.

4. Replace PC 1777 Panel.

20004 PANEL_AUDIO_FAILED 1. Restart the unit. Do not touch the User

Interface during system startup. Interfering with the knobs, keys, touch screen, loudspeaker grid, etc, may affect the internal technical tests.

2. Replace the loudspeaker.

3. Replace PC 1777 Panel.

20005 PANEL_PERSISTENT_CHECKSUM_ERR 1. Replace PC 1772 Monitoring.

Revision 02 Service Manual 6 - 15

Troubleshooting SERVO-s Ventilator System

Error code

Error message / Possible cause Recommended action

Communication error between PC 1777 Panel and PC 1772 Monitoring.

Restart ventilator

Expiratory Flow Meter

40001 Technical error in Exp flow meter.

If the technical alarm ‘Expiration flow meter PC 1784 60 V underrange’ is logged together with error code 40001, see recommended action for this specific fault.

1. Restart the ventilator and perform a Pre-use check.

2. Check the Control cable that connects the Patient Unit with the User Interface.

3. Replace PC 1862 DC/DC & Standard connectors.

4. Replace PC 1772 Monitoring.

1. Replace the expiratory cassette.

2. Replace PC 1784 Expiratory channel.

3. Replace PC 1785 Expiratory channel connector.

If technical alarm ‘Expiration flow meter PC 1784 60 V underrange’ is present:

1. Replace PC 1862 DC/DC & Standard Connectors.

Technical error in

Expiratory cassette

Technical error in Expiratory cassette or in the communication with the cassette.

If the technical alarm ‘Expiration flow meter Exp. cassette power failure’ is logged together with error code ‘Technical error in Expiratory cassette’, see recommended action for this specific fault.

5. Replace the expiratory cassette.

6. Replace PC 1785 Expiratory channel connector.

7. Replace PC 1784 Expiratory channel.

If technical alarm ‘Expiration flow meter Exp. cassette power failure’ is present:

1. Replace PC 1862 DC/DC & Standard Connectors.

6 - 16 Service Manual Revision 02

SERVO-s Ventilator System Preventive maintenance

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.

7. Preventive maintenance

General .............................................................. 7 - 2

Preparations ...................................................... 7 - 2

Equipment ......................................................... 7 - 2

Preventive maintenance .................................... 7 - 3

Maintenance kit, 5,000 hours ........................ 7 - 3

Performing the Preventive maintenance ....... 7 - 3

Revision 02 Service Manual 7 - 1

Preventive maintenance SERVO-s Ventilator System

General

• A '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.

• 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.

• The internal Lithium batteries on PC 1771 and PC 1772 shall be replaced every five years.

• It is recommended that a regular cleaning and an extended cleaning of the inspiratory channel should be performed before carrying out 'Preventive maintenance'. Refer to instructions in the User's Manual.

• In some parts of the Preventive maintenance, as described in this chapter, access to the Field Service System (FSS) is required.

• Some optional equipment used with the SERVO-s, but not covered by this Service Manual, may also demand maintenance actions. Refer to the optional equipments documentation. Example on such optional equipment are:

– Humidifier – Compressor Mini.

Preparations

• Make sure that the SERVO-s works properly before performing any maintenance.

• Check if there are any unexpected 'Technical alarms' in the 'Service log' available via the 'Biomed menu'. 'Technical alarms' are available also via the Field Service System (FSS).

• Set the On/Off switch on the User Interface to Off.

• Disconnect the mains power cable.

• Disconnect the gas supplies (wall and/or cylinder).

• Remove patient tubing.

• If fitted, remove bacteria filter from the expiratory inlet.

Equipment

• Standard service tools.

• Barometer (or information about the actual barometric pressure).

• Access to the Field Service System (FSS). Recommended but not required.

• Preventive maintenance kit containing all parts needed during the maintenance.

7 - 2 Service Manual Revision 02

SERVO-s Ventilator System Preventive maintenance

Preventive maintenance

Maintenance kit, 5,000 hours

Only original parts from the manufacturer must be used. Spare parts and maintenance kits can be ordered from your local MAQUET representative.

When performing this maintenance, a 'Maintenance kit, 5,000 hours' should be used.

The following parts shall be replaced and they are included in the 'Maintenance kit, 5,000 hours':

A. Filters for the gas modules B. Nozzle units for the gas modules C. Bacteria filter for the inspiratory pressure

transducer

D. Bacteria filter for the O

cell

ServoS-9079

Performing the Preventive maintenance

• Disassembling and assembling of the unit is required when replacing parts included in the 'Maintenance kit, 5,000 hours'. If not stated otherwise, refer to chapter 'Disassembling and assembling' for instructions.

• The letters A – D in the text below refers to the description of the Maintenance kit above.

• Prepare the unit as described in section 'Preparations' above in this chapter.

Gas modules

A. Replace filters in the gas modules. When

replacing filter, move the rubber seal from the old to the new filter.

ServoS-9082

Revision 02 Service Manual 7 - 3

Preventive maintenance SERVO-s Ventilator System

B. Replace plastic nozzle units in the gas modules.

After replacement of plastic nozzle units, wait 10 minutes before connecting pressure to the gas modules.

Inspiratory pressure transducer filter

C. Replace the filter for the inspiratory pressure

transducer. Make sure that the filter is correctly seated into the rubber ring.

Refer to instructions in the 'SERVO-s Ventilator System – User's Manual'.

ServoS-9080

Note: This filter may already be replaced as a part of the 'Extended cleaning of Inspiratory channel' performed in combination with the Preventive maintenance.

Bacteria filter for O

D. Replace the bacteria filter for the O

applicable).

cell

cell (if

Refer to instructions in the 'SERVO-s Ventilator System – User's manual', chapter 'Maintenance'.

Note: This filter is not used on the O

Sensor.

ServoS-9081

7 - 4 Service Manual Revision 02

SERVO-s Ventilator System Preventive maintenance

Internal fan filter

• Remove the internal fan filter (1).

• Check if the filter is damaged. Replace damaged filter.

• If not damaged, clean the filter. The filter can be rinsed in water. Shake out and make sure that the filter is free from excess water.

• Mount the new/cleaned filter.

ServoS-9084

Internal fan

• Connect the mains power cable.

• Set the On/Off switch to Standby.

• The temperatur sensor controlling the Internal fan is mounted on PC 1863 Power control. Carefully warm-up PC 1863 (2) and check that the Internal fan starts. Use e.g. a light bulb or a heat fan to warm the PC board.

The Internal fan will start at approx.:

33 °C (91 °F) with half effect 43 °C (109 °F) with full effect.

Note: The temperature must not exceed 70 °C (158 °F).

ServoS-9013

It is also possible to check the Internal fan by running the unit in a ventilation mode and wait until the Internal fan starts. If this test method is used, the main cover must be mounted in order to raise the temperature inside the compartment.

Expiratory cassette

• Remaining operating capacity (in %) for the membrane can be shown in the 'Status' window. Select Status / Exp. cassette to check 'Remaining membrane capacity'.

• When this capacity 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'.

• The operating capacity meter must be reset after replacement of the membrane. To access the reset button, select Menu / Biomed / Service.

Revision 02 Service Manual 7 - 5

Preventive maintenance SERVO-s Ventilator System

User Interface

• Check the touch screen readability: – Transparency – Surface – Brightness (backlight). 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.

• Check if pixels on the touch screen are defective. Open the Status window. A few defective pixels can be accepted. Check that defective pixels are not concentrated to a small area thus reducing the readability in this area. FSS is recommended but not required.

• Perform the checks listed below and make sure that the software responds to these actions. FSS is recommended but not required.

– Check the touch screen functions. Press buttons

on different parts of the touch screen.

– Check the Main Rotary Dial. Turn and press the

Main Rotary Dial.

– Check the Direct Access Knobs. Turn all Direct

Access Knobs.

– Check the membrane buttons. Press all

membrane buttons.

Barometric pressure

• Select Status / General on the User Interface. Check that the Barometric pressure value shown on the User Interface corresponds to the actual Barometric pressure value at the local site. The

value shown on the User Interface may not differ more than ±5% from the actual barometric pressure.

• If the value shown on the User Interface differs more than ±5% from the actual barometric pressure, the barometer in SERVO-s must be calibrated. FSS is required.

Battery modules

System SW version V2.01.00 (or higher) includes an advanced monitoring of the battery status. The System SW will, among others, monitor:

• Expiry date. The life span for the Battery module is calculated to two and a half year from manufacturing 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'.

Note: Replace both batteries at the same time.

Lithium batteries

• Check manufacturing date for the lithium batteries mounted onto PC 1771 and PC 1772. The batteries must be replaced after 5 years. Replacement is described in chapter 'Service procedures'.

Safety inspection

• Make a visual inspection of the SERVO-s for external defects or damages. Replace defective or damaged parts.

• Check the mains power cable and control cable and their connections for damage.

• Perform a leakage current test. The leakage current test is a standard procedure regulated by IEC 60 601-1 or corresponding national standards. Allowable values and test methods are defined in the standard. The use of a leakage tester, e. g. Bender Safety Tester 601/751 or equivalent is recommended.

• Check that a 'SERVO-s Ventilator System – User's Manual' corresponding to the installed System version is present. Also check that operating manuals for all optional equipment connected to the SERVO-s are present.

Gas supply pressure transducers

• Connect the gas supplies (Air and O

• Select Status / General on the User Interface.

• Disconnect the gas supply, one gas at the time.

• Check that the corresponding supply pressure value in the 'Status'-window drops.

7 - 6 Service Manual Revision 02

Completing the Preventive maintenance

• Perform a 'Pre-use check'. Refer to the 'SERVO-s Ventilator System – User's Manual'.

• Perform 'Function checks' on the optional equipments connected to the SERVO-s. Refer to the operating manuals for these optional equipments.

• Reset the Preventive maintenance time meter. Use the reset button (select Menu / Biomed / Service / Report PM) or use the FSS. Also note in a SERVO-s log book that a Preventive maintenance has been performed.

SERVO-s Ventilator System Index

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.

8. Index

Alphabetic index ................................................ 8 - 2

Revision 02 Service Manual 8 - 1

Index SERVO-s Ventilator System

AC/DC Converter 2-7, 3-10, 4-16 Aeroneb Pro 2-3 Alarm output connector 2-3, 2-6, 3-12, 10-2 Assembling guidelines 4-2

Backlight Inverter 2-5, 3-3, 4-3, 4-6 Backlight lamps 2-5, 3-3, 4-3, 4-9 Bacteria filter for O2 cell 7-4 Barometric pressure 7-6 Battery modules 2-7, 3-11, 4-16, 5-2, 7-6 Biomed key 5-4 Breathing SW 2-9

Cable reel 2-4 Change access code 5-5 Compressor Mini 2-3 Connector muff 2-7, 3-4, 4-15 Control cable 2-4, 3-10, 4-22 Control cable connector 2-6, 10-2 Copy configuration 5-5

Direct access controls/knobs 2-4, 2-5 Display with touch screen 2-4

Fuse F1 2-6, 3-10 Fuse F11 2-6, 3-10 Fuse F12 2-6, 3-10

Gas cylinder restrainer 2-3 Gas inlet 2-6, 3-4 Gas modules 2-6, 3-3, 4-15, 7-3 Gas supply pressure transducers 7-6

Handling PC boards 4-2 Hazard notices 1-4 Heating foil 2-8, 3-7 Humidifier holder 2-3

Inspiratory channel 4-18 Inspiratory outlet 2-6, 3-5 Inspiratory pipe 2-7, 3-4, 4-15 Inspiratory pressure transducer filter 7-4 Inspiratory pressure transducer tube 2-7, 3-5 Inspiratory section 3-3 Installation 1-5 Installation Instructions 1-4 Internal fan 2-6, 2-7, 3-11, 4-18, 7-5 Internal fan filter 7-5

EEPROM 3-2 Edit configuration 5-5 Environmental declaration 1-6 Equipotentiality terminal 2-6 ESD protection 1-4, 4-2 Expiratory cassette 2-8, 3-6, 6-16, 7-5 Expiratory cassette membrane 4-21 Expiratory inlet 2-6, 2-8

Expiratory one-way valve 2-8 Expiratory outlet 2-6 Expiratory section 3-6 Expiratory valve coil 2-8, 4-20 External +12 V DC supply 2-6, 10-2

Field service system (FSS) 5-6 Fixed keys 2-4 Fixed keys label 4-10 Flash memory 3-2 Functional check 1-5 Functional main blocks diagram 10-3

8 - 2 Service Manual Revision 02

Label strips 4-10 Lithium batteries 1-5, 5-3, 7-2, 7-6 Locking arm 2-4 Loudspeaker 2-5, 3-2 Loudspeaker booster kit 2-3, 3-12 Loudspeaker grid 2-4 Luminescence detector 2-4

Main blocks diagram 10-3 Main cover 4-14 Main rotary dial 2-4, 2-5 Main units 2-2 Mains indicator 2-4 Mains inlet 3-9 Mains supply connector 2-6 Maintenance kit 5,000 hours 7-3 Memory types 3-2 Menu key 5-4 Mobile cart 2-3 Monitoring SW 2-9

SERVO-s Ventilator System Index

N26 connector 9-2 N28 connector 9-2 N29 connector 9-2 N70 connector 9-2 Non-volatile memory 3-2

O2 cell 2-7, 3-5 O2 cell adaption 5-5 O2 Sensor 2-7, 3-5 On/Off switch 2-4, 3-2, 4-3, 4-4 On/Off switch cover 2-4, 3-2, 4-3, 4-4 Optional equipment 2-3

P63 connector 10-2 Panel SW 2-9 Patient Unit 2-2, 2-6, 3-3, 4-14, 4-15 PC 1771 Control 2-7, 3-8, 4-2, 4-16, 5-3 PC 1772 Monitoring 2-7, 3-9, 4-2, 4-16, 5-3 PC 1777 Panel 2-5, 3-2, 4-2, 4-3, 4-4 PC 1781 Expiratory pressure transducer 2-8, 3-8 PC 1781 Inspiratory pressure transducer 2-8, 3-8 PC 1784 Expiratory channel 2-8, 3-9, 4-2, 4-19 PC 1785 Expiratory channel connector 2-8, 3-8, 4-20 PC 1860 Main back-plane 2-7, 3-8, 4-17 PC 1861 Pneumatic back-plane 2-7, 3-6, 4-19 PC 1862 DC/DC & Standard con. 2-7, 3-10, 4-17 PC 1863 Power control 2-7, 3-10, 4-17 PC board Backlight inverter 2-5, 3-3, 4-3, 4-6 PC card 4-2 PC card slot 2-4 Power supply 3-9 Pressure transducers 3-8 Pre-use check 6-3 Preventive maintenance 7-3

Service connector 2-4 Service contract 1-4 Set date and clock 5-5 Shelf base 2-3 Side cover 4-14 Software information 5-6 Software installation 5-6 Software structure 2-9 Spare parts information 1-4 Special function keys 2-4, 4-12 Special waste 1-4 Standard connectors 10-2 Standby indicator 2-4 Start/Stop/Standby ventilation key 2-4 Support Arm 176/177 2-3 Support plate 4-3 SW Update 5-6 SW Upgrade 5-6 Symbols used in this manual 1-4 System ID 2-9, 4-17 System SW 3-2, 4-2, 5-6 System version 1-4

Technical error codes 6-11 Technical training 1-4 Temperature sensor 3-9, 3-10 TFT Display 2-5, 3-3, 4-7 Threadlocking adhesives 4-2 Tightening torque 4-2 Touch screen incl. frame 2-5, 3-3, 4-3, 4-10

Ultrasonic flowmeter 2-8, 3-7 User Interface 2-2, 2-4, 3-2, 4-3, 7-6 User Interface controls 3-2 User interface panel cover 2-3 User's Manual 1-4

RAM 3-2 Rear cover 4-3 Replacing PC boards 4-2 RS232 2-6, 10-2

Waterbag pole 2-3

Safety inspection 7-6 Safety valve 2-7, 3-6, 4-18 Safety valve membrane 4-18 Serial number label 1-4, 2-4, 2-6 Serial port 2-6 Service card 5-6

Revision 02 Service Manual 8 - 3

Index SERVO-s Ventilator System

Notes

8 - 4 Service Manual Revision 02

SERVO-s Ventilator System Service Manual revision history

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.

9. Service Manual revision history

Revision 01 ........................................................ 9 - 2

Revision 02 ........................................................ 9 - 4

Revision 02 Service Manual 9 - 1

Service Manual revision history SERVO-s Ventilator System

Revision 01

Revision history table – Revision 01

In the table below, the following keywords are used in ‘Comment’ column:

• Added. Information added to the manual e.g. due

to new functionality.

• Changed. Information changed in the manual e.g.

due to changed functionality.

• Corrected. Corrections made due to printing

errors or lack of information in the previous version of the manual.

Page Section Comment

1-4 Symbols used in this manual Texts corrected. 1-5 Service Battery module replacement interval changed.

1-6 Environmental declaration Battery modules information corrected. 1-7 Articles of consumption Item 6 and 7; replacement interval changed. 2-3 Descriptions of optional equipment Information regarding Aeroneb Pro added. 2-4 User Interface User Interface Type 2 information added. 2-6 Patient Unit Serial number information corrected. 2-8 Expiratory cassette PC 1786 information corrected. 2-9 SERVO-s software structure SW Service Release information added.

3-2 Memory types used in SERVO-s SW Service Release information added.

3-2 User Interface User Interface Type 2 information added. 3-2 PC 1777 Panel PC 1777 Type 2 information added. 3-2 Loudspeaker Loudspeaker booster kit information added. 3-3 Backlight Inverter Backlight Inverter Type 2 information added. 3-3 Touch screen including frame Touch screen including frame Type 2 information

3-3 TFT Display with Backlight TFT Display with Backlight Type 2 information

3-6 Expiratory cassette Cassette design information changed Q1 2005. 3-8 PC 1784 Expiratory channel Thermistor information corrected. 3-9 PC 1772 Monitoring Trend information added. 3-9 Power supply Internal DC supply voltage and Power supply

3-9 PC 1862 DC/DC & Standard connectors N26 information regarding alarm corrected.

3-10 PC 1862 DC/DC & Standard connectors P63 information regarding Alarm output connector

Texts regarding worn-out batteries and other disposable parts corrected.

Trend information added.

added.

selection information corrected.

corrected.

9 - 2 Service Manual Revision 02

SERVO-s Ventilator System Service Manual revision history

3-10 Battery modules Battery module functional description changed. 3-10 Control cable Connect/disconnect information corrected.

4-3 User Interface User Interface Type 2 information added. 4-4 PC 1777 Panel PC 1777 Type 2 information added. 4-5 Replacement of PC 1777 Type 1 New spare part kit, assembling information added. 4-6 Backlight Inverter Backlight Inverter Type 2 information added. 4-7 4-8

4-9 Backlight lamps Backlight lamps Type 2 information added. 4-14 Battery modules Slot number information corrected. 4-19 Expiratory cassette membrane Changed spare part (metal washer), assembling

4-20 Control cable Connect/disconnect information corrected.

5-2 Battery modules Battery module service procedure changed.

5-4 Using the Menu and Biomed key Minor changes due to System version 3.0.

5-4 Biomed Information corrected.

5-5 Edit configuration Minor changes in Alarm sound level, Alarm limits

5-5 Change access code Change access code information added.

5-6 Software installation Software information changed.

5-6 Field Service System Information corrected.

6-2 General System version reference changed.

6-3 Pre-use check Patient circuit test information added.

6-8 Safety valve test PC 1772 replacement information corrected.

6-9 Flow transducer test Information about water in the cassette corrected.

6-9 Battery switch test Information that the test will not be performed if

6-10 Separate Patient circuit test Patient circuit test information added. 6-11 Error code 2 and 3 Recommended actions corrected. 6-14 Error code 48, 49 and 50 Information added. 6-15 Error code 20005 Information added. 6-16 Restart ventilator Information added.

7-2 General Battery module life span information changed.

7-6 Battery modules Battery module maintenance information changed.

7-6 Completing the Preventive maintenance Preventive maintenance time meter and log book

TFT Display TFT Display Type 2 information added.

information changed.

and NIV alarms. Startup configuration information added.

Software delivery information changed.

less than 10 minutes backup time remains added.

information corrected.

Revision 02 Service Manual 9 - 3

Service Manual revision history SERVO-s Ventilator System

Revision 02

Revision history table – Revision 02

In the table below, the following keywords are used in ‘Comment’ column:

• Added. Information added to the manual e.g. due

to new functionality.

• Changed. Information changed in the manual

e.g. due to changed functionality.

• Corrected. Corrections made due to printing

errors or lack of information in the previous version of the manual.

Page Section Comment

1-4 Symbols used in this manual Symbols changed.

1-5 Service System SW recommendation added.

1-5 Hazard notices Cleaning information corrected.

1-6 Environmental declaration Backlight Inverter corrected.

1-7 Environmental declaration Product End-of-Life information added.

2-3 Descriptions of optional equipment Support Arm 176 added.

2-4 User Interface On/Off switch and switch cover information in text

2-7 Patient Unit O2 Sensor information in text and illustration

2-9 Monitoring O2 Sensor information added.

3-2 Memory types used in SERVO-s O2 Sensor information added.

3-2 PC 1777 Panel On/Off switch and switch cover information added.

3-2 Loudspeaker Loudspeaker booster kit information moved to

3-4 Inspiratory pipe O2 Sensor information added.

3-5 O2 Sensor O2 Sensor functional description added. 3-10 PC 1862 DC/DC & Standard connectors P63 Alarm output connector information moved to

3-12 Optional equipment Alarm output connector information extended and

General changes – Revision 02

Sensor is added as an alternative to the O2 cell

• O

in several texts throughout the manual.

These changes are not included in the Revision history table below.

cell corrected.

Sensor added.

Humifier Holder for rail added. Loudspeaker booster kit added. Isolation shield with drip guard added.

and illustration added.

added.

section ‘Optional equipment’.

moved from section ‘PC 1862 DC/DC & Standard connectors’.

Loudspeaker booster kit information extended and moved from section ‘Loudspeaker’.

Isolation shield with drip guard added

9 - 4 Service Manual Revision 02

SERVO-s Ventilator System Service Manual revision history

4-3 User Interface On/Off switch cover information added.

Threadlocking adhesive information corrected. Text regarding PC Card eject button corrected. On/Off switch position during assembling

information added. 4-4 PC 1777 Panel On/Off switch and switch cover information added. 4-8 TFT Display Type 2 New TFT Display cable and cable locking device on

Type 2, information added.

4-12 4-13

5-4 Using the Menu and Biomed key Minor changes due to System version 3.1. 5-4 Biomed Report PM functionality changed. 5-5 Startup configuration Corrected, System Version 3 required. 5-5 O2 cell adaption Corrected. 6-2 General System version reference changed. 6-8 O2 cell/sensor test O2 Sensor and gas mixture information added.

6-12 Error code 12 Recommended actions corrected.

7-2 General Text regarding regular cleaning and extended

7-2 Preparations Text regarding check of ‘Technical alarms’ added. 7-4 Bacteria filter for O2 cell O2 Sensor information added. 9-1 9-5

10-1 Diagrams Chapter number changed from 9 to 10. 10-3 Functional Main Blocks diagram O2 Sensor information added.

Membrane foil New spare part, assembling information added.

cleaning corrected (adapted to the User’s Manual).

Service Manual revision history New chapter added.

Battery module information corrected.

PC 1786 Exp. channel cassette corrected,

temperature sensor shown in the diagram.

Revision 02 Service Manual 9 - 5

Service Manual revision history SERVO-s Ventilator System

Notes

9 - 6 Service Manual Revision 02

SERVO-s Ventilator System Diagrams

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.

10. Diagrams

Standard connectors ......................................... 10 - 2

Functional Main Blocks diagram ...................... 10 - 3

Revision 02 Service Manual 10 - 1

Diagrams SERVO-s Ventilator System

Standard connectors

N28 / N70 – Control cable

1. +12V_UNREG_PANEL

2. GND

3. LED_CONTROL

4. ON_OFF_CONTROL

5. CAN_PANEL.H

6. CAN_PANEL.L

N26 – External +12 V DC supply input

1. +12V_UNREG_EXT_DC

2. +12V_UNREG_EXT_DC

3. –

4. GND

5. GND

N29 – RS232

1. –

2. CI_RDX_ISO

3. CI_TDX_ISO

4. CI_DTR_ISO

5. GND_ISO

6. –

7. –

8. –

9. –

10 - 2 Service Manual Revision 02

1. NO – Normally Open

2. NC – Normally Closed

3. Common

4. Common

P63 – Alarm output connector

SERVO-s Ventilator System Diagrams

Functional Main Blocks diagram

PNEUMATICS VIEW FROM: RIGHT SIDE

INSP. OUTLET

SAFETY OUTLET

To PC 1860: P10

EXP. INLET

ELECTRONICS VIEW FROM: REAR SIDE

MAINS INTERNAL FAN

EQUIPOTENTIAL PIN

ServoS 07-05-22

INLET

& FUSES

PC1862

DC/DC & STANDARD CONNECTORS

FUSE F1

N28

N29

N26

P63

INSP. PRESS. TUBE

INSPIRATORY PIPE

SAFETY VALVE

SAFETY

VALVE

PULL

MAGNET

N17

P17

N10

HEATING FOIL

INSP.

ID ID

PRESSURE

PC1781

TRANSDUCER

P50

MOD2

TEMP.

SENSOR

LEFT SIDE

N92 P92

P5 N5

AC/DC CONVERTER

P N

N14 P14

N22

PC1772 MONITORING

P23P23

N22

PC1771 CONTROL

TEMP.

SENSOR

P32 N32

BATTERY MODULE

PC1863 POWER CONTROL

P31 N31

BATTERY MODULE

INSPIRATORY SECTION

N19

P19

O2 CELL

P18

N18

PC1861 PNEUMATIC BACK-PLANE

EXPIRATORY SECTION

PC1786 EXP. CHANNEL

H B

PC1785 EXPIRATORY CHANNEL CONNECTOR

ULTRASONIC FLOWMETER

N46

P46

CASSETTE

PC1785

P45 N45

PRESSURE TRANSDUCERS

EXP. PRESSURE

TRANSDUCER

N41 P41

P24

μP

To PC 1860: N4

PC 1860 MAIN BACK-PLANE

μP

CONNECTOR

MUFF

CCM

P2 N2

GAS

MODULE

VALVE

P40 N40

GAS

MODULE

AIR

EXP.

ONE-WAY

VALVE

EXP. VALVE COIL

EXPIRATORY OUTLET

N16

PC 1781

P1N15

EXPIRATORY CASSETTE

EXPIRATORY

EXP. PRESS. TUBE

P50

MOD1

PC1784 EXPIRATORY CHANNEL

PS1

BATTERY

P10

P21A/B

N21

P21A/B

N21

TO PC 1861: N10

TO PC 1784: P4

FILTER

TEMP. SENSOR

N19 P19

INLET

AIR

INLET

O2 SENSOR

INSPIRATORY PIPE

N18

P18

FUNCTIONAL MAIN BLOCKS

C CONTROL E EXPIRATORY SECTION F EXPIRATORY CHANNEL I INSPIRATORY SECTION M MONITORING P POWER SUPPLY T PRESSURE TRANSDUCERS U USER INTERFACE

SYMBOLS

N/PXX

CONNECTOR

N/PXX

INCLUDING CAN BUS

ID PROM COMMUNICATING

WITH MONITORING

COOLING AIR FLOW

μP

MICRO PROCESSOR

PANEL VIEW FROM REAR SIDE

LIGHT

BACK-

P72

P73

P80

P79

PC1777 PANEL

P81

SW1

μP

N70

P82

P71

P77

SW2

P83

P84

CONNECTION

PC CARD

P74

SLOT

P75

P85

P86

FOR PC

(SERVICE)

P76

P78

Revision 02 Service Manual 10 - 3

Maquet Critical Care AB SE-171 95 Solna, Sweden Phone: +46 8 730 73 00 www.maquet.com/criticalcare

For local contact:

Please visit our website www.maquet.com

GETINGE GROUP is a leading global provider of equipment and systems that contribute to quality enhancement and cost efficiency

within healthcare and life sciences. Equipment, services and technologies are supplied under the brands ARJO for patient hygiene, patient handling and wound care. GETINGE for infection control and prevention within healthcare and life science and MAQUET for Surgical Workplaces, Cardiopulmonary and Critical Care.

Order No.: 66 28 825. Revision 02, May 2007. Price group: 7. Printed in Sweden.

Maquet Servo-S User manual

Specifications and Main Features

Frequently Asked Questions

User Manual