SLE 2000 Service Manual

Ventilator

Service manual

Infant Ventilator

0120

Issue

6

Contact Information:

SLE Limited
Twin Bridges Business Park
232 Selsdon Road
South Croydon
Surrey CR2 6PL

Telephone: [phone]

Fax: [phone]

E-mail: [email protected]

Web site: www.sle.co.uk

(E-mail’s should be addressed to the Service Manager)

All rights reserved. No part of this publication may be reproduced, stored in any retrieval system, or
transmitted in any form or by any means, electronic, mechanical, photocopy, recording or otherwise,

without prior permission of SLE. © Copyright SLE 30/09/2001.

Manual : SM0007 Issue 6

Page 2 of 120

Contents

1. Introduction ............................ ..... ................................................................8

2. Principles of Operation SLE2000 Valveless System ................................ 8

3. User/Owner Responsibility ............................................. ..... ..... .... .............10

4. Warnings ...................................................................................................... 11

5. Symbols Used on or in the Equipment .....................................................12

6. Glossary Of Abbreviations .........................................................................13

7. Ventilator Control Description ...................................................................16

7.1. Front Panel.........................................................................................16

7.2. Function of Front Panel Controls and Indicators ................................17

7.3. Rear Panel..........................................................................................19

7.4. Side panel...........................................................................................20

8. Accessing the SLE2000 Internal Components. ........................................22

8.1. Electronic Module...............................................................................22

8.2. Pneumatic Module..............................................................................22

8.2.1. To Remove The Main PCB (A0702/01)........................................23

8.3. To Separate The Two Modules...........................................................24

8.4. Removal Of The Oxygen Blender.......................................................25

8.5. Removal Of Oxygen Cell....................................................................26

9. Maintenance ........................... ..... ................................................................28

9.1. Cleaning & Sterilisation.......................................................................28

9.1.1. Bacterial Filters............................................................................29

9.2. Expiratory Tube...................................................................................29

9.3. Monthly Operational Checks...............................................................30

9.3.1. Battery condition and LED display test........................................30

9.3.2. Air and Oxygen Supply Failure Alarm test................................... 30

9.3.3. Condition of O2 Cell .....................................................................30

9.3.4. Proximal Airway Pressure Gauge Accuracy ................................30

9.3.5. Inspiratory Nozzle........................................................................30

9.4. Preventative Maintenance..................................................................31

9.5. Overhaul.............................................................................................31

9.5.1. Service Parts List.........................................................................32

10. Test Equipment Required .........................................................................34

11. Electronic Module .....................................................................................35

4.1. Description of Operation.....................................................................35

4.2. Electronic Module Calibration Procedure ...........................................37

4.2.1. Preliminary Checks and Adjustments ..........................................37

Page 3 of 120

4.2.2. System watchdog................................................... ..... .... ..... ........37

4.2.3. Pressure Transducer PTR1 to ADC.............................................37

4.2.4. Pressure Transducer Buffered Output .........................................37

4.2.5. CPAP Alarm Set Point Control.....................................................38

4.2.6. PIP Control.................................................... .... ..... ......................38

4.2.7. Inspiration Time............................................................................38

4.2.8. Alarm Vo lume...............................................................................38

4.2.9. Fresh Gas Block and leak Alarm..................................................39

4.2.10. FIO2 Digital Display....................................................................39

4.2.11. Airway Trigger Calibration..........................................................39

4.3. SLE 2000 Electrical Troubleshooting Chart........................................41

5. Pneumatic Module .............................. ..... ..... .... .........................................42

5.1. Description of Operation.....................................................................42

5.2. Fresh Gas System..............................................................................44

5.3. CPAP System .....................................................................................45

5.4. Inspiratory System..............................................................................46

5.5. Pneumatic Calibration Procedure.......................................................47

5.6. Pneumatic Circuit Diagram.................................................................48

5.7. Pneumatic Module Parts List..............................................................49

5.8. SLE 2000 Pneumatic Troubleshooting Chart......................................51

6. Technical Specification ...............................................................................54

6.1. Conventional Ventilation .....................................................................54

6.2. Displays..............................................................................................54

6.3. Controls .............................................................................................. 55

6.4. Alarms.................................................................................................55

6.5. Power , Dimensions etc......................................................................56

7. Electronic Circuit Details ............................................................................58

7.1. Display Board A0700/01.....................................................................58

7.1.1. Display Board Circuit Diagram A0700/01.....................................59

7.2. LED Board A0701/01..........................................................................61

7.2.1. LED Circuit Board Diagram CD/A0701/01...................................62

7.3. Ventilator CPU Board AS/A0702/01 Issue 4......................................65

7.3.1. Ventilator CPU Board CD/A0702/01 Issue 2 Sheet 1 of 3 ........... 66

7.3.2. Airway Trigger Circuit Diagram CD/A0702/01 Sheet 2 of 3.........67

7.3.3. Window Pressure Alarm A0702/01 Sheet 3 of 3..........................68

7.4. Ventilator CPU Board AS/A0702/01 Issue 5......................................72

7.4.1. Ventilator CPU Board CD/A0702/01 Issue 6................................73

7.5. RS232/423 Option..............................................................................77

7.6. Power Supply, Alarms and Oxygen Signal Conditioner (A0703)........79

Page 4 of 120

7.6.1. Power Supply Circuit Diagram CD/A0703/01...............................80

7.7. CD/W0288 Wireloom..........................................................................83

7.8. Electronic Chassis..............................................................................84

7.8.1. Electronic Chassis........................................................................85

8. A3 Circuit Diagram Appendix ..................................... .... ...........................89

9. Service Information and Technical bulletins .................................... ..... ...100

9.1. TService Information...........................................................................101

9.1.1. SI 980301 Ventilator Alarms and INOSYS...................................101

9.1.2. SI 980302 Ventilator oxygen cells (N2191)..................................103

9.1.3. SI 990101 Ventilator Alarms and INOSYS ..................................104

9.1.4. SI 990302 Possible inadvertant solenoid failure messages.........106

9.1.5. SI 000201 Leak Alarm Trigger Threshold....................................108

9.2. Technical Bulletins..............................................................................110

9.2.1. TB 990603 Removal of hour counter from electrical chassis....... 110

9.2.2. TB 000201 New versions of control software...............................111

9.2.3. TB 000801 Ventilator firmware history.........................................112

10. Issue Revision Record ..............................................................................115

11. Index ...........................................................................................................116

Page 5 of 120

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Page 6 of 120

Introduction

Page 7 of 120

1. Introduction

The SLE2000 is a constant flow, time cycle, and pressure limited neonatal ventilator
with patient triggering.

Main features are that it has no expiratory valve but uses a reverse flow of mixed gas
that is injected from the exhaust manifold into the expira tory limb of the p atient circuit.
This flow of gas has the effect of compressing 5 LPM humidified gas into the patient
ET tube.

The advantage of this system is that there is no expiratory resist ance due to valves or
diaphragms, therefore no inadvertent PEEP is generated.

2. Principles of Operation SLE2000 Valveless System*

The patient circuit is supplied with a constant fixed flow of 5LPM fresh gas. This gas
comes from the internally mounted oxygen blender and its concentration is also
monitored by a fuel cell and displayed on the FlO2 digital display. This fresh gas
supply is then passed through a humidifier to the inspiratory port of the patient ET
connector. Built into the ventilator are circuits to detect either a gas flow failure or a
tubing blockage. The patient circuit requires a restrictor fitted into the inspiritory port.
Therefore, only SLE approved patient circuits must be used.

The Expiratory limb of the patient circuit is connected to the Exhalation port on the
ventilator. This consists of a removable block mounted on a manifold, accessed by
lowering the left hand side cover. The expiratory manifold has two nozzles. The front
one to generate CPAP/PEEP and is supplied via the CPAP regulator on the front
panel of the Pneumatic Module. The rear one to generate peak inspiratory
pressure(PIP).

To avoid the possibility of gas dilution these regulators are supplied with the same
oxygen concentration as t he Fr e s h Ga s sup ply . The fr on t no zzl e is u sed to generate
an opposing flow to the Fresh Gas in t he e x hala ti on b lo ck and t hu s cr ea te C PAP The
rear nozzle is used to generate the peak inspiratory pressure in the same way,
supplying constant pressures at all breathing rates.

Page 8 of 120

The PIP regulator and gauge on the
front panel set the pressure that is
supplied to a solenoid valve which is
connected to the rear nozzle.
The Electronic Modul e cont rols the r ate
and duration of the flow of Driv ing Gas
into the Exhalation block in opposition
to the Fresh Gas flow. This opposing
flow acts as a pneumatic piston and
creates a pressure wave at the ET
manifold. The lung inflation pressure
and hence the tidal volume are
controlled by the PIP regulator.

NOTE: The ventilator should be set to a square waveform for breathing rates
above 60 BPM

* The Valveless Ventilation Principle was designed and patented by Prof. J G Whitwam and Mr.
M. K. Chakrabarti of the R.P.G.M.S Hammersmith Hospital.
This patent is exclusively licensed to SLE

Page 9 of 120

3. User/Owner Responsibility

This SLE 2000 INFANT VENTILATOR equipment and the authorised accessories for
it are designed to function as specified in the relevant instruction manual only when
operated, maintained and repaired in accordance with supplied manuals and
instruction s. This equipment must be periodi cally checked, recalibrated, maintained
and components rep a ired an d repla ced whe n necessa ry for th e equi pment to opera te
safely and reliably. Parts that have failed, in whole or in part, or exhibit excessive
wear, or are contaminated, or are otherwise at the end of their useful life should not be
used and should be replaced immediately with parts su pplied by SLE or parts which
are otherwise approved by SLE. Equipment which is not functioning correctly or is
otherwise in need of repair or maintenance must not be used until all necessary
repairs and/or maintenance have been completed and a factory authorised service
representative has certified tha t the equipm ent is fit and rea dy for use. This equipment
and any of its accessories or component parts should not be modified.

The owner/user of this equipment shall have the sole responsibility and liability for any
damage or injury to p er son s or property (includin g the eq ui pm e nt itself) resulting fr om
operation not in accordance with the operating instructions, or from faulty
maintenance not in acco rd an ce w i th the au tho ris e d mai nt en ance i nstr u ctions, or from
repair by anyone other than a factory authorised service representative, or from
unauthorised modification of the equipment or accessories, or from the use of
components or accessories that have either been damaged or not authorised for use
with this equipment by the factory.

Page 10 of 120

4. Warnings

1 Oxygen - Clinical use. Oxygen is a drug and sho uld be prescribed as such.
2 Oxygen - Fire Hazard. Oxygen vigorously suppor ts combustion and its use

requires special precaution to avoid fire hazards. Keep all sources of ignition
away when oxygen is in use. Do Not use oil or grease on oxygen fittings or
where oxygen is used.

3 The ventilator functional tests must be carried out each time the SLE 2000 is

used on patients. If any of th ese te sts do not function as d escr ibe d t hen there is
a problem and the ventilator must not be u sed until it is rectified.

4 The humidifier used in the patie nt circuit must be operated and maintained in

accordance with its manufacturer’s instructions. It is the owners responsibility to
ensure that the equipment is regularly maintained.

5 Failure to comply with the recommended service programs could lead to injury to

the patient, operator or damage to the ventilator. It is the owners responsibility
to ensure that the equipment is regularly maintained.

6 Functioning of this ventilator may be adversely affected by high frequency

surgical (Diathermy) , defibrillators, mobile phones, short-wave therapy or
equipment producing strong magnetic fields, operating the in vicinity.

7 The Ventilator must be plugged into a suitably rated and grounded electrical

power source.
8 There is no special protection provided against ingress of water or liquids.
9 The equipment is not suitable for use with, or in the p r esence of flammable

anaesthetic mixtures.
10 Use only SLE approved patient circuits. On no account should antistatic or

electrically conductive tubing be used in the patient circuit.
1 1 No external voltage shoul d be ap plied to the au xiliary socket. Any c onnections to

this socket must be approved by SLE and screened to comply with EMC

regulations. Ensure protection cap is fitted when socket is not in use.
12 The electronic module of the ventilator contains a primary battery for mains

failure alarm, if the ventilator is not to be used for 3 months or more, then the

battery should be removed.
13 Care should be taken when attaching other equipment as this may affect

stability.
14 If the SLE 2000 Infant Ventilator is adversely affected by equipment emitting

electromagnetic interference then that equipment should be switched off or

removed from the vicinity of the 2000. Conversely, if the 2000 is the source of

such interference to neighbouring equipment then it should be switched off or

taken to another location.
15

Page 11 of 120

5. Symbols Used on or in the Equipment

Protective Earth

Attention, C onsult accompanying documents.

B.S.I. and I.E.C. symbol for equipment with type B (non
isolated parts).

WARNING : - No external voltage should be applied to the
auxiliary socket.

Mains
Fuses

WARNING : - The electronic module contains a primary
battery. If the unit is not to be used for a period exceeding 3
months, it is recommended that the battery be removed.

Two externally accessible fuses are;
Type T 0.2 amps. For 200 - 250V
Type T 0.5 amps. For 100 - 120V

Page 12 of 120

6. Glossary Of Abbreviations

amp........................Ampere

BPM .......................Breaths Per Minute

cm ..........................Centimetre

cmH2O ...................Centimetres of Water Pressure

CMV.......................Continuous Mandatory Ventilation

CPAP......................Continuous Positive Airway Pressure

°C...........................Degrees Centigrade

°F............................Degrees Fahrenheit

DISS.......................Diameter Index Safety System

ETO........................Ethylene Oxide

ET...........................Endotracheal

Exp.........................Expiration Time

FIO2........................Fractional concentration of Inspired Oxygen

Hz...........................H ertz

ID............................Internal Diameter

I:E...........................Inspiratory : Expiratory ratio

Insp ........................Inspiration Time

IMV.........................Intermittent Mandatory Ventilation

MAP .......................Mean Airway Pressure

IPPB.......................Intermittent Positive Pressure Breathing

IPPV.......................Intermittent Positive Pressure Ventilation

kg ...........................Kilogram

lb ............................Pound

LPM........................Litres per Minute

Peak.......................Peak Airway Pressure

ml ...........................Millilitre

O2...........................Oxygen

PEEP......................Positive End Expiratory Pressure

PSI .........................Pounds per Squire Inch

psig.........................Pounds per Squire Inch Gauge

SIMV ......................Synchronous Intermittent Mandatory Ve ntilation

VAC........................Volts, Alternating Current

Vt............................Tidal Volume

Nist.........................Non interchangable Standard Terminal

PTV........................Patient Triggered Ventilation

PIP .........................Peak Inspiratory Pressure

ms ..........................Millisecond

Page 13 of 120

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Page 14 of 120

Ventilator Control

Description

Page 15 of 120

7. Ventilator Control Description

The SLE 2000 consists of two linked modules, Electronic and Pneumatic.

Electronic
Module

Pneumatic
Module

7.1 Front Panel

2

28

27

26

25

3

1

4

5

7

6

9

8

10

11

12

13

14

15

16

17

18

Page 16 of 120

24

23

22

21

20

19

7.2 Function of Front Panel Controls and Indicators

Nº Item Description

1 POWER and

OPERATIONAL

Selects Power OFF, ALARM TEST/CPAP, CMV,
PTV, SIMV modes.

MODE Switch

2POWER LED Indicates power is ‘ON’.

3 SYSTEM FAIL LED When this LED lights and the alarm sounds, it

indicates failure of the main processor. If this
happens, the ventilator must be removed from
service.

4 BPM digital display

with adjustment
knob

5 INSP. TIME digital

display with
adjustment knob

6 FRESH GAS

Displays between 1-250 BPM.
Available in two ranges: 1-125 BPM& 126-250
BPM, selectable by rear security key switch

Inspiratory Time
Displays 0.1-3.0 seconds in 1-125 BPM range
or 0.01-0.3 seconds in 126-250 BPM range.

Indicates problems within the patient circuit line.
BLOCK audible
alarm.

7 I:E RATIO digital

display

Displays from 9.9:1 to 1:9.9 calculated from BPM

and insp. time

8 LEAK LED’s

Indicates problems within the patient circuit line.
audible alarm.

9 MAX MEAN MIN

switch with digital

Selects and displays Max., Mean or Min airway

pressures.
PRESSURE display

10 FIO2 digital display Accurately displays the % O2 as set by the Air-

Oxygen Blender.

11 TRIGGER BACK-

UP LED

Indicates a machine-d elivered brea th due to p atient

failure to trigger ventilate or during back- up time

window.

12 MANUAL BREATH

Pushbutton

Causes delivery of a single breath in CPAP, CMV

and PTV modes to preset inspiration times and

pressures.

13 Pressur e Gauge -6

to +60 cmH2O.

Proximal Airway Pressure. This pressure is

displayed more accurately by the independent

digital display.

14 PTV SENSITIVITY

control

Variable patient trigger level setting.

Sensitivity between 1(least sens iti ve t o p at ient

effort) and 5 (most sensitive to patient effo rt).

Page 17 of 120

Nº Item Description

15 PRESSURE WAVE

switch

16 ALARM MUTE

Permits change of lead ing edge of pressure wave

from square to taper in 1-125 BPM range only.

Mutes audible alarms for one minute.
Pushbutton and
LED

17 AIR OXYGEN

BLENDER control

Sets air/oxygen mix between 21 and 100% 02 ±

3%

with digital indication from independent monitoring

circuits.

18 O2 inlet O2 hose connector.
19 Medical air inlet Medical air hose connector.

20 Inspiratory

Pressure
Regulator

21 SYSTEM DRIVING

PRESSURE gauge

Adjusts driving pressure to set circuit inspiratory

pressure.

Range 0-60 cmH2O.

Approximate indication of the pressure above

PEEP which will be delivered to the patient in CMV,

PTV, SIMV or manual breath modes.

22 CPAP/PEEP

regulator

Sets CPAP level in the circuit, range is 0 to 15

cmH2O (nominal).

23 ALARM RESET

Resets audible an d visual alarms.
Pushbutton

24 Fresh Gas Port 5LPM blended gas supply to patient (ventilator

powered up).

1LPM blended gas supply to patient (ventilator

OFF)

25 Proximal airway Proximal airway tube connector.
26 Exhalation block Connection for expiratory limb of patient circuit.
27 PIP, CYCLE FAIL

and HIGH alarm

Sets visual and audible alarm level for inspiratory

pressure between 0 and 60 cmH2O.
LED’s with control

28 CPAP Alarm LED

and control

Sets visual and audible alarm level for CPAP

pressure.

Page 18 of 120

7.3 Rear Panel

1

2

3

4

8

7

6

5

Nº Item

1FIO

calibration adjustment.

2

2 125 - 250 BPM range switch
3 Aux. Output socket.
4 Fuse Holders
5 Optional serial port
6 Running Time Indicator
7FIO

adjustment tool.

2

8 Alarm sounder

Page 19 of 120

7.4 Side panel

1

2

3

Nº Item

1 Side flap latching mechanism.
2 Fixed jet.
3 Expiratory tube guide.

Page 20 of 120

Components

Access to Internal

Page 21 of 120

8. Accessing the SLE2000 Internal Components.

Caution: All electrical and pneumatic connections must be disconnected before

attempting to gain access to either Electronic or Pneumatic modules.

8.1 ELECTRONIC MODULE

«

A

«

A

«

«

B

1) Remove 2 screws at rear (A) and 2 screws at each side of the unit (B).

2) Slide top cover to rear and remove.

8.2 PNEUMATIC MODULE

B

«

1) Open Side Flap (C).

2) Remove 2 screws at rear (D) and 2 screws at base of unit (E).

3) Lift complete unit from base and turn upside down.

Page 22 of 120

8.2.1 To Remove The Main PCB (A0702/01)

Caution: Observe anti static precautions when handling the PCB.

1) To remove the main PCB
A0702/01 loosen the two
retaining washers (A.)

«

«

A

A

2) Cut the ca ble tie connecting
the fresh gas tube to PTR1 (B)

3) Pull the fresh gas tube from
the transducer.

4) Disconnect the two ribbon
cables (C) from the PCB

5) Cut the ca ble tie connecting
the Proximal Airway Tube to
PTR1 (D)

6) Pull the Proximal Airway T ube
from the transducer.

7) The PCB can now be
removed.

D

«

C

«

«

C

B

«

Page 23 of 120

8.3 To Separate The Two M odules

1 Invert ventilator to gain access to the base of the pneumatic module.
2 Remove the four screws (A).

View A

«

«

A

C

«

A

«

D

«

«

B

«

A

«

A

View A

C) Remove proximal airway pressure tube connection (B).
D) Remove Fresh gas monitoring tube connection (C).
E) Release both locking screws and disconnect the 15 way plug (D).
It is now possible to separate the pneumatic module from the electronic chassis.

Page 24 of 120

8.4 Removal Of The Oxygen Blender

1) Gain access to the pneumatic module.

2) Remove the flowmeter outlet (A) (if fitted).

3) Unclip the large volume chamber (B) and
move it to one side. It is not necessary to
disconnect the tubing connector.

B

«

A

«

4) Undo and remo ve the two nuts, screws
and washers (C) from the side panel.

5) It is now possible to manoeuvre th e Oxygen blender ou t
of the front panel aperture a sufficient distance to enable
the main supply connector (D) to be uncoupled.

6) It will now be possible to completely remove blender
from module.

To instal l new blender repeat the above proc ess in reverse order.

C

«

«

D

«

Page 25 of 120

8.5 Removal Of Oxygen Cell

«

A

«

«

B

«

C

«

E

A. Loosen two screws (A) and lift manifold (B) away from cell (C).
B. Disconnect cell connector (D)
C. Replace cell (Part No. N2191) and reconnect (D). Ensure that foam rubber pad

(E) is fitted between cell and mounting base.

«

D

Note: When replacing cell ensure that the base of the cell is aligned correctly in
mounting base, also that the manifold is securely fitted into the new cell prior to
repositioning the manifold block.

To recalibrate the new cell turn oxygen blender to 100% and switch ventilator on and
remove air supply. Adjust digital display reading to read 100% using the FIO2

calibrating control on the rear of the electronic module.

Page 26 of 120

Maintenance

Page 27 of 120

9. Maintenance

9.1 Cleaning & Sterilisation

Following each pati e nt u se i t i s i mpor t ant to clean the exteri or of the v ent il a tor wi th a n
all purpose liquid cleaner or detergent, as well as to disassemble and clean the
various components in the patient circuit system, heated humidifier chamber, and
exhalation tube.

Before cleaning the exterior of the ventila tor and the humid ifier, the power cords
should be unplugged from the mains supply.

CAUTION. Do not allow water to enter the control module or its electrical sockets.
Electronic malfunction may result.

DO NOT steam autoclave the Oxygen blender o r oth er wi se subject it to tem pe ratu re s

above 145°F.
DO NOT immerse any part of the SLE2000 in any liquid decontaminant or fluids, with

the exception of the expiratory valve assembly.
DO NOT use any strong solvent cleaners on the front panels or labe ls.
The expiratory tube system with the exception of any bacteria filters should be

cleaned with a warm deter ge nt solu ti on . All p a r t s sho ul d th en be thoro ug hly rin sed i n
warm water and prepared for steri lisation. A bacter ia filter fitte d between the patien t
circuit and the expiratory tube connection, will reduce the need to autoclave the
exhalation block. Should this block require sterilisa tion it can be autoclaved at 134°C
in a standard chamber.

Page 28 of 120

9.1.1 Bacterial Filters

C

A

B

A. Filter SLE Part Nº N2029 can be fitted to fresh gas supply.
B. Filter SLE Part Nº N2587 or N2187 (not illu strated) can be fitted to expiratory

tube. This removes the need to sterilise the expiratory tube between patients.

C. Silencer SLE Part Nº N2186 can be fitted to the rear of the expiratory tube. This

serves the purposes of reduceing the noise of the inspiratory gas flow.

9.2 Expiratory Tube

This can be removed and steam autocla ved. The bl ock mounting the two flow no zzles
can be wiped with a lint free cloth and a mild detergent.

Page 29 of 120

9.3 Monthly Operational Checks

9.3.1 Battery condition and LED display test.

Switch unit to CPAP position. All alarms should sound for two seconds. All digital
displays should show a sequ ence of digit s fro m 0 to 9 an d all ala rm LE D’ s ( except th e
Block LED) will be on for the duration of this test.

9.3.2 Air and Oxygen Supply Failure Alarm test.

With the FIO2 blender set to 60% rem ove in turn both air a nd oxygen supplies. C heck
that in each case the alarm sounds, and on replacement the alarm cancels.

9.3.3 Condition of O2 Cell

Set blender to 21% and observe th at displaye d FIO2 is 21%. Set blender to 100% and
observe that displayed FIO2 is 100%. Adjust if necessary. If error prior to adjustment
exceeds 10% replace O2 cell.

9.3.4 Proximal Airway Pressure Gauge Accura cy

Set ventilator to CMV; 60 BPM: 0.5 sec. inspiration time. Adjust PIP pressure to 50
cmH2O digitally displayed. Compare digital pressure display with mechanical gauge.

Error should not exceed 3%.

9.3.5 Inspiratory Nozzle

Turn the inspiratory pressure regulator fully clockwise, adjust PIP alarm fully
clockwise. Set ventilator to CMV: 60BPM: 0.5 sec inspiration time. Peak inspiration
pressure should be greater than 60 cmH2O.

Page 30 of 120

9.4 Preventative Maintenance

Preventative maintenance should be completed at a maximum of every 5000 hours
operation or at 6 monthly intervals. This maintenance is intended to be carried out in
the hospital.

Preventative Maintenance will include :

• Visual insp ection and clea ning of a ll exteri or surfac es, controls, att achment s and
accessories.

• Removing the covers and cleaning all dust from the interior of the unit.

• Visual inspection of all tubing, electrical wiring, connectors, crimps, screws, nuts,
hardware and checking the general condition of all other internal components
and assemblies.

• Inspection of the mains failure battery holder for corrosion and replacement of
the battery.

• Pneumatic and electronic testing and where necessary calibration of ventilator.

• Replacement of orifice block ‘O’ ring.

• Replacement of battery.

9.5 Overhaul

Overhaul should be carri ed out a t a m axim um of 10,000 hours operation o r e ver y tw o
years of service which ever is sooner. This overhaul will be performed by an SL E
trained hospital engineer or an SLE service engineer.

In addition to the checks and items performed during the preventative maintenance,
an overhaul will include :

• Replacement of oxygen monitor cell,

• Replacement of oxygen blender,

• Replacement of main solenoid SV1,

• Replacement of PIP and CPAP regulators

• Replacement of orifice block ‘O’ ring.

• Replacement of battery.

• Checking operation and general condition and replacing where necessary the
following components :

Solenoid valves SV2 and SV3.
Tubing and connectors
Battery holder
Alarm sounders
Mode, wave shape, frequency range and pressure range switches.
Pressure relief valves.

SLE offer an exchange service for the pneumatic module.

Page 31 of 120

9.5.1 Service Parts List

Preventative Maintenance 5,000 Hour

Item Part Number

‘O’ Ring N2042
Battery MN1500

Overhaul 10,000 Hour Service or 2 Years

Item Part Number
Blender N2185 EX
Oxygen Cell N2191
Solenoid Valve SV1-SV3 N2195/05
0-4 Bar regulator N2181
0-1 Bar regulator N2182
‘O’ Ring N2042
Battery MN1500

Page 32 of 120

Calibration

Setup and

Page 33 of 120

10. Test Equipment Required

The following test equipment is required to perform the calibration and set up

procedures as described in See “Electronic Module Calibration Procedure” on
page 37.

Electronic: Digital multimeter (Fluke 77 or similar ).

Twin beam oscilloscope ( Hameg HM205 or similar).

Pneumatic: Multi-range Pressure and Flow analyser (Timeter RT200 or similar).

O2 Analyser (Servomex 570A or similar)

Miscellaneous: Connectors and tubing.

Metric hexagonal keys 3mm, 2.5mm, 2mm.
2mL syringe.
10mL syringe.
Variable Flow Restrictor

Electronic Module Dummy Load (optional):

This is a test load which plugs into the 15 way ‘D’ connec tor on the
base of the electronic module. It emulates the resistive loads of the
pneumatic module solenoids thus allowing the electronic unit to be
tested in isolation.

details as follows;

Page 34 of 120

11. Electronic Module

The SLE 2000 is arranged in two modules. The Electronic Module is the upper of the
two modules which contains all of the electronic controls an d displays.

4.1 Description of Operation

Refer to circuit diagram “Vent ilator CPU Board CD/A0702/01 Issue 6” on page 73.

The processor board comprises the main microprocessor and ventilator control
circuitry, the display drivers, the patient trigger system, and pneumatic alarm circuitry

The processor (U14) is an 80C31 running at 11.0592MHz. It is an 8 bit processor,
employing time m ultipl exed addr ess and dat a ope ration s. Softw are is pro vided by the
EPROM (U6).

Analogue input parameters from panel control settings (BPM rate, ins piration time,
CP A P alarm thr eshold, PIP alarm th reshol d) are con verted to digit al 8 bit w ords b y the
ADC (U18) which scans each input in turn. Open circuit input fault conditions are
detected by software and pull-up resistor array (RU3). Switched input parameters
(mode, Range, Reset, Mute, Pressure display Mode) are scanned by (U12).

Confirmation of correct solenoid valve energisation voltages is fed to (U14/14) by
potential divider R34, R32 and clam p D3.

Supply voltage supervisor (U7) will attempt to reset the processor (U14/9) should the
logic supply voltage of 5.12V dc fall below 4.8V dc. It also holds the processor reset
for a 2 second test period on power up.

Unlatched audible alarm BZ1 is activated when any analogue input is detected to be
outside the predetermined range. It is driven from (U14/4) via (U13) to PLB 7a. In
conjunction with BZ1 there are three visual latched alarms (CPAP Fail, High Pressure,
Cycled Failed); all are processor activated from outputs (U14/2,6,1) which are
buffered by (U1 0) an d con ne c ted to P LB 1 4a, 3b, and 14b respecti vely. The buffered
high pressure alarm output also de-energises the dump valve solenoid via PLB20b.

Trigger back-up and alarm mute indication LED's are driven by the processor from
(U14/5) and (U14/7) via buffer (U10) and are connected to PLB3a and PLB 15b.

The main PIP solenoid valve and the wavesha pe solen oid valve are driven from (U14/
8 via buffer (U10) and MOS driver Q4.

The LED Board A0701/01 (See “LED Circuit Board Diagram CD/A0701/01” on
page 62.) accommodates the max., mean, min. LED buffer (U400) and LED’s CPAP,
Cycle Fail, High Pressure, Block, Leak and Trigger.

(U1) and (U2) are 7 segment display drivers.

Page 35 of 120

There is a supervisory watchdog alarm system which consists of (U8) and BZ2. This
monitors a train of 10ms pulses from (U14/3) to confirm the correct running of the
software. A disruption of these pulses will activate a latched audible alarm BZ2. In
addition, reset pulses from (U7/6) to (U14/9) will attempt to restart the software until
the 10ms watchdog pulses are restored.

The Mains Failure Alarm relay RL1 is energised from the 5.12 volt logic supply and
holds pins 1 and 14 open. Should the relay de-energise contacts 1 and 1 4 will close,
and a battery powered alarm will be activated via connections P LB 18a and PLB 20 a.

On power-up, a short test period is initialised. Time constant R2, C5 via (U4) forward
biases (Q1) for approx. 2 seconds, therefore shorting PLB 18a and PLB 20a and
operating the battery alarm.

PTR1 is connecte d to th e pro ximal airw ay pressur e lin e. (U 13/1 , 2, 3) and associa ted
components form an 8V dc voltage regulator. (U13/8. 9, 10) process the analogue
voltage output from PTR1 into the range 1-3.4V corres ponding to pres sures of 0-40
cmH2O prior to A to D conversion. (U13/5, 6, 7) process the analogue voltage output

to the range 1-6V dc for an input of 0-50 cm H2O for an analogue output signal.

Fresh gas failure pressure transducer PTR2 monitors the fresh gas supply pressure
transducer PTR1 monitors the fresh gas supply pressure and activ ates the audibl e
alarm BZ3 and also drives the leak alarm LED should the pressure fall below 17.5
cmH2O. If the pressure rises above 80 cmH2O then the block LED is operated and

the audible alarm will activate.

Page 36 of 120

4.2 Electronic Module Calibration Procedure

Note: If electronic module is being set up without the pneumatic module attached,
then a dummy load must be conn ected to 15 way ’ D ’ connector on base of module as
a substitute for the solenoid valves. (See “Test Equipment Required” on page 34.)

4.2.1 Preliminary Checks and Adjustments

Remove printed circuit board A702 from PLB connector.
Check that PLB 1b is connected to the chassis earth terminal.
Connect -ve probe of DVM to PLB 1b (0V).
Check the voltage on PLB 32b is approx. 5.12V dc ±0.01V.
Check the voltage on PLB 22b is approx. +12-14 V dc.
Check the voltage on PLB 6b is approx. +55V dc ± 5V.
Power down unit under test and replace PCB A702 into its socket.
Power up unit and set mode to CPAP.
Monitor PLB 32b adjust RV 102 on A703 to give 5.12V dc ±10mV
Monitor voltage at cathode of D5, check that voltage is 55V dc ±5V.
Set inspiration control to 3 seconds. With wave shape switch set to square position,
press manual breath button, and confirm that voltage falls to 30V ± 5Vdc.
With the pressure wave switch set to taper position, press manual breath button, and
confirm that voltage falls to 25V ±3V dc.

4.2.2 System watchdog

Note: This control is factory set and should not normally require adjustment on
service.

Monitor (U3) pin 11. By adjusting RV10 ascertain the two points where the voltage
falls from 5.12V to 0V, then set RV10 to midway between these positions, and
ensure that the voltage on (U3) pin 11 is a continuous +5.12V.

4.2.3 Pressure Transducer PTR1 to ADC

With PTR1 open to atmosphere monitor the DC voltage on pin 26 (U18). Adjust RV2
to set voltage to 1V ± 10mV. Using a suitable accurate reference apply a pressure of
40 cmH2O ± 0.1 cmH2O to PTR 1,P2. Adjust RV5 to give 3.4V dc ± 10mV. Repeat

this procedure until both voltages are correct to within ±10mV for their respective
pressures.

4.2.4 Pressure Transducer Buffered Output

With PTR1 open to atmosphere, monitor voltage on PLB 23b and adjust RV3 to give
1V dc ±10mV. Then with a suitably accurate pressure source apply a pressure of 50
cmH2O ±0.1 cmH2O to PTR1 P2, then adjust RV4 to 6.0V dc ±10mV. Repeat this

procedure until both voltages are accurate to within ±10mV for their respective
pressures.

Page 37 of 120

4.2.5 CPAP Alarm Set Point Control

Monitor voltage on (U18) pin 27.
With the CPAP control fully ACW slowly rotate control until voltage just exceeds 0V

and not more than 50mV.
Then release the collet on the control knob and re-position it so that the pointer points

to -5 cmH2O. Tighten collet and rotate control to 15 cmH2O and adjust RV9 to 1.2V

dc ±10mV.

4.2.6 PIP Control

Monitor voltage on (U18) Pin 2. With control turned fully ACW rotate clockwise and
note position where voltage = 0.3V ±5mV. Loosen collet on knob and reposition to
point to 10 cmH2O. Retighten collet. Adjust control pointer to 50 cmH2O and adjust

RV7 to 2.7V ±10mV. Turn knob back to 10 cmH2O and check voltage is 0.3V. Repeat
adjustment if necessary.

4.2.7 Inspiration Time

Rotate Inspiration time control knob fully clockwise and adjust RV6 to give a digital
display of 3.0 seconds.

4.2.8 Alarm Volume

Note: This control is factory set and should not normally require adjustment on
service.

Check that adjustment to RV1 varies the audible alarm volume, then set RV1 to
middle of its travel. Verify that a suitable alarm volume is present.

Page 38 of 120

4.2.9 Fresh Gas Block and leak Alarm

Remove gas supplies from vent ilator and connect digital voltme ter between pins 2 an d

4 of PTR2. Adjust RV500 to give voltage of 0V ±0.1mV.
With Air and O2 connected to the pneumatic module and the blender set to 21%

monitor the fresh gas flow and confirm that flow is 5LPM ±0.25LPM. With a suitable
flow control valve create a pressure in the fresh gas line of 17.5 ±0.5 cmH2O. Adjust

RV501 so that the leak alarm and LED just trip on.
Close the flow control valve until pressure in the line increases to 80±1 cmH2O and

adjust RV502 until the block alarm and LED just trip on.

4.2.10 FIO2 Digital Display

With both Air and O2 supplies at approximately 4 bar pressure, monitor gas at the
fresh gas outlet with an Oxygen analyser with an accuracy 1% or better. Set O2
blender to 100% oxygen. Remove air supply and note reading on analyser. Then

adjust the calibration potentiometer on rear panel of electronic module so that the
FIO2 digital display agrees with the analyser reading to within ±0.5%.

Return Air supply.

Note: This following control is factory set and should not normally require
adjustment on service.

Set blender contr ol to 21 %, then remov e o xygen su pply and adj ust R V101 on P CB
A703 until digital display show s 21 %. R ep ea t b oth at 21% and 100% set ti ngs until
both readings are better than 1%.

Check for linearity at all 10% points on the front panel FIO2 scale and ensure
accuracy checked against analyser is better than 3% on the blender and 1% on the

digital display.

4.2.11 Airway Trigger Calibration

Using a complete standard patient circuit (N2188) with a humidifier chamber and test
lung fitted, perform the following.

1) To set the expiratory time window, with a dual beam oscilloscope connect CH1
to pin 2 (U200) and gr ou nd , w ith tr ace i nve rte d, CH2 to p in 4 ( U20 0) ; ( ti meba s e
100ms/cm; sensitivity 2V/cm); set ventilator to CMV, 60 BPM, 0.5s Insp. time.
This will produce two positive going similar waveforms. Adjust RV200 such that
the interval between the two leading edges is 200ms ±10ms.

2) Select a BPM rate of 1 BPM and an inspirat ion time of 0. 5 seconds, set PIP to 30
cmH2O and with the CPAP regulator turned off completely and the alarm

parameters set CPAP = 0 cmH2O, PIP = 30 cmH2O.

Page 39 of 120

3) Switch ventilator into PTV Mode and adjust PTV threshold potentiometer fully
clockwise.

4) Fit a 2 ml syringe into the tracheal port of the ET manifold.

5) Slowly draw 2 ml of air from the tracheal port at an approximate rate of 2ml in 0.5
second.

6) If ventilator fails to trigger or falsely triggers, it will be necessary to adjust RV202
until the desired response is achieved.

7) Remove 2ml syringe and replace with 10ml syringe.

8) Turn PTV threshold fully anti-clockwise, draw 10ml over 0.5 seconds ensuring
that the ventilator triggers on this inspiratory effort.

Page 40 of 120

4.3 SLE 2000 Electrical Troubleshooting Chart

PROBLEM

1. When unit is switched
ON, POWER light is not
illuminated, battery fail
alarm sounds continu­ously.

2. SYSTEM FAIL alarm will
not cancel

POSSIBLE CAUSE REMEDY

a) No A.C power

b) No A.C power to trans-

former

c) No secondary voltages

(45V rms & 10V rms)

d) No DC voltages from

PSU PCB (60V, 12V, &

5.12V)

e) Fault on processor PCB

Check wall sockets.

Check: fuses
mains filter
on-off switch

Check for short circuits, oth­erwise change transformer

Check for short circuits, oth­erwise replace A0703/01
PCB and recalibrate.

Replace A0702/01 pcb and
recalibrate

Processor pcb faulty Replace A0702/01 PCB and

recalibrate

3. HELP message displayed
on digital readout

4. SOL message displayed
on digital readout

5. Ventilator powers up, but
does not cycle in CMV
mode and no audible or
visual alarms.

Open circuit analogue i nputs

to processor

a) Faulty or open circuit

solenoid

b) faulty wave shape switch

c) Faulty BPM range switch

d) Faulty power supply

e) Harness fault

Check for 5.12V dc on pin

PLB 32b of PCB A0702/
01

Check operation of potenti­ometers and wiring harness
connections

Check operation of solenoid
and replace if necessary

Replace

Replace

Refer to 1d

Refer to circuit diagram and
check integrity of harness
connections

If voltage absent refer to 1d

Page 41 of 120

5. Pneumatic Module

5.1 Description of Operation

Air and oxygen supplies are connected directly to the blender. The output of the
blender is supplied via panel mounted regulator REG.1 (inspiratory pressure) and
solenoid valve SV1 to the inspiratory nozzle in the exhalation block. It is also
connected to the norm ally closed po rt of the wave shap e solenoi d (SV3) an d the larg e
volume chamber.

In inspiration mode the valve SV1 opens and allows a flow of blended gas into the
patient circuit vi a the inspirat ory nozzle. This flow opposes the const ant fresh g as flow
and creates an inspiratory pressure.

The function of the large volume chamber and valve SV3 is to delay this flow of gas
during the inspiratory phase when the pressure wave switch is set to taper. On
expiration SV3 de-energises and dumps to atmosphere so that the expiratory airway
pressure falls rapidly as in square mode.

REG2 (CPAP) is also supplied from the oxygen blender. This front panel mounted
regulator controls the flow of blended gas from the CPAP nozzle in the exhalation
tube. This gas being a constant flow in oppositio n to the fresh gas flow creates a
CPAP/PEEP pressure in the patient circuit.

NOTE any changes of CPAP pressure will also change the peak inspiratory pressure.
This is arranged so that the tidal volume is always constant and unaffected by
changes in CPAP.

REG3 is an internal regulator which regulates the blended gas to a working pressure
of 10 PSI. NV1 is adjusted to set a 5 LPM blended gas flow into the fresh gas port on
the front panel when SV2 is activated (eg the ventilator is powered up). This flow
passes through valve SV2 (fresh gas dump solenoid) which will dump the fresh gas
should the patient circuit pressure reach the high pressure alarm threshold. When
SV2 is deactivated (ventilator off or fresh gas dumped) then the fresh gas flow is
1LPM. This residual flow is to ensure correct operation of the humidifier.

RV2 is an additional relief valve which activates at fresh gas pres sures above
140cmH2O.

NV2 sets a 7LPM bleed to atmosphere. This flow combined with the 5LPM fresh gas
flow ensures that the oxygen blender has the 12LPM flow through it required to
maintain its accuracy. This bleed is also fed to the oxygen monitoring cell, whose
output is connected to the digital F102 display circuitry in the electronics module.

Page 42 of 120

The fresh gas transduce r PTR2 is moun te d in the electronic modul e a nd m onitors the
patient airway pressure. The SLE 2000 because of its unique principle of operation
will ventilate the patient without the fresh gas supply. In order to ensure that the
patient is always being supplied wi th fresh humidified gas, a rest rictor is fitted in the
patient fresh gas tubing close to inspiratory port of the ET conn ector. The restrictor
maintains a circuit pressure of approximately 20 cmH2O. This pressure is monitored

by PTR2 to be within the range 17.5-80 cmH2O. A leak or a blockage con dition in thi s
circuit causing the pressure to be outside of these limits will activate the respective

alarms. A pressure above 80 cmH2O will cause the block alarm and L ED to operate
and dump the fre sh gas via S V2. If the p ressure fall s belo w 17 .5 cm H2O then the leak
alarm and LED will be activated.

Page 43 of 120

5.2 Fresh Gas System

Gas from the AIR/OXYGEN Blender is supplied to the preset regulator REG3 via the
supply manifold. The output of REG3 is set to 10PSI and is fed to two flow valves.

NV2, which is set to a flow of 7LPM and dumps to atmosphere via the O2 cell.

NV1, which is prese t to 5LPM and supp lie s th e f re sh g as to the patient cir c u it vi a SV2
(high pressure dump solenoid) and a circuit preset pressure relief valve RV2.

The SV2 bypass provides a continuous flow of 1LPM through the humidifier in the
event of a hi gh pressure dump.

Page 44 of 120

5.3 CPAP System

Gas from AIR/OXYGEN Blen der is supplied to the CPAP pressure regulator REG2 via
the supply manifold. The output pressure of REG2 is fed to the CPAP nozzle in the
expiratory manifold, and into the expiratory limb of the patient circuit to create the
circuit CPAP pressure.

Page 45 of 120

5.4 Inspiratory System

Gas from the AIR/OXYGEN Blender is supplied to the user adjustable PIP regulator
REG1 through the supply manifold. The output pressure of REG1 is supplied to the
inspiratory nozzle via the solenoid valve SV1 which controls the breathing rate. If the
pressure wave switch is in the taper position then SV3 is energised and the inspiratory
flow enters the large volume chamber before reaching the inspiratory nozzle, thus
lengthening the pressure rise time.

Page 46 of 120

5.5 Pneumatic Calibration Procedure

Connect ventilator to air and oxygen supplie s with standard p atient circ uit and with the
electronic module switched to CPAP mode. Set PIP control fully clockwise and adjust
blender to 21% Oxygen.

NOTE:

a) Monitor the Fresh Gas Pressure regulator output using the test point provided

and adjust output of regulator Reg.3 to 10 PSI ± 0.5 PSI.

b) Monitor minimum flow valve at outlet on base of machine. Ensure that the

oxygen cell is fit ted securely and there are no leaks at its seating.
Adjust and set dump valve NV2 to 7 LPM ±0.25 LPM.

c) Monitor flow from the fresh gas outlet port on the front panel, and adjust flow

valve NV1 to give a flow at this port of 5 LPM ± 0.25 LPM.

d) With the Mode switch in the OFF position, check that the Fresh Gas flow at the

Fresh Gas port is 0.8 to 1.2 LPM.

Repeat adjustments (a) to (c) until all measurements are within their respective
tolerances.

Monitor the proximal airway pressure with a standard test manometer. With the P.I.P.
regulator fully anti-clockwise, turn CPAP regulator fully clockwise and ensure that
CPAP pressure is greater than 15 cmH2O and less then 20 cmH2O. Turn CPAP

regulator fully anti-clockwise and check that CPAP pressure is now less than 1.0
cmH2O.

Set PIP alarm fully clockwise to above 60 cmH2O. Turn PIP regulator to its maximum
clockwise position and the CPAP regulator fully ACW and with inspiration control set

to 3.0 seconds, press manual breath push-button and ensure that the PIP pressure
exceeds 60.0 cmH2O.

With Air & O2 input pressures at 4.0 bar, press manual push button and observe PIP
pressure, then reduce Air & O2 to 3.5 bar and ensure PIP pressure still re m ains at 60
cmH2O ± 2 cmH2O.

Connect Oxygen analyser to fresh gas supply and verify that oxygen output is
accurate to within 3% of setting in 10% steps.

Page 47 of 120

5.6 Pneumatic Circuit Diagram

Page 48 of 120

5.7 Pneumatic Module Parts List

N2211

Page 49 of 120

Page 50 of 120

5.8 SLE 2000 Pneumatic Troubleshooting Chart

Sympton Possible Caus e Remedy
Blender:
Audible Alarm w hen Air

& O2 supplies are
connected

% O2 error exceeds

±3%

Block/Leak Alarm:
Leak alarm when

patient circuit is
connected.

1. Air/O2 differential
pressure exceeds 30PSI

2. Jammed Alarm

1. Digital FIO2 reading
requires adjustment.

1. No Air/O2 supply.

2. Excessive PIP.

3. Leak in patient circuit.

4. Fault is fresh gas
supply.

Ensure Air/O2 differential
pressure is less than

20PSI
Disconnected Air & O2

supplies and reconnect. If
fault persists, reject
blender.

Check % O2 with suitable
calibration reference.

Adjust digital readout as
appropriate. If fault
persists, rej ect blender.

Connect supply gas as
appropriate.

Adjust PIP alarm
threshold or PIP regulator
and press reset.

Check humidifier for
leaks. Check restrictor is
in correct position.

With reset button held in,
occlude fresh gas port. If
BLOCK alarm does not
replace LEAK alarm,
contact qualified Ser v ic e
Engineer.

Block alarm 1. Blockage in fresh gas

supply.

Low Peak Inspiration
Pressure

1. Low Air/O2 supply
pressures.

Replace patient circuit.

Ensure Air/O2 supply = 4
Bar.

Page 51 of 120

2. PIP alarm threshold too
low .

Adjust PIP alarm
threshold.

3. Fault in patient circuit.

4. Exhalation block not
properly located.

5. Blocked Inspiratory
nozzle.

6. Faulty PIP regulator

CPAP Desired CPAP pressure

cannot be achieved.

Excessive residual

Faulty Patient circuit. Replace patient circuit

PEEP

Replace patient circuit.
Relocate exhal ation block.

Refer to qualified Service
Engineer

Refer to qualified Service
Engineer

As for PIP (see above).

Page 52 of 120

Specification

Technical

Page 53 of 120

6. Technical Specification

6.1 Conventional Ventilation

Modes: CPAP,CMV,PTV,SIMV
BPM Ranges: 1-125 or 126 - 250 breaths per minute (1BPM

STEPS) selected via rear security key switch
Inspiratory Time: 0.1-3.0 or 0.01-0.3 seconds
I:E Range : 9.9:1 - 1:9.9 calculated from BPM and INSP.

TIME settings.
CPAP Pressure: 0 cmH2O to 15 cmH2O minimum.
Inspiratory Pressure: 0 cmH2O to 60 cmH2O

switched fast or slow rise waveforms.

6.2 Displays

Proximal Airway Pressure Gauge Gauge range -6 to +60 cmH2O

Seven segment LED’s: showing BPM, INSP. TIME, I:E RATIO, FIO2

and PRESSURE (max., mean or min.).

Indicator LEDs: POWER: green LED indicates power on.

SYSTEM FAIL: Indicates main processor
system fail.
TRIGGER BACK-UP: Indicates a machine
delivered breath if patient fails to trigger
ventilator during back-up time window.
MAX., MEAN, MIN.: indicates which value is
being displayed on the 7 segment pressure
display.
MUTE: Indicates that the mute function is
active.

Alarm LED’s LOW CPAP : warning of the pressure drop ping

below the LOW CPAP alarm limit
CYCLE FAIL: warning that no breath has been
detected. Ventilator breath is below alarm
threshold.
HIGH: warning of the PIP alarm limit being
exceeded
BLOCK: warning of a block in the fresh gas
supply limb of patient circuit.
LEAK : warning of a leak in the fresh gas
supply limb of the patient circuit.

Driving Pressure Gauge:
(Scaled for resultant inspiratory
pressures above PEEP)

Page 54 of 120

Gauge range :0-60 cmH2O plus PEEP level

6.3 Controls

Ventilation mode switch: OFF, ALARM TEST/CPAP, CMV, PTV, SIMV
BPM Control (ten turn): either 1-125BPM or 126-250BPM
INSP. TIME Control (ten turn): either 0.10-3.00 seconds (min exp time: 0.25

seconds) or 0.01-0.3 seconds (min exp time:

0.12)
Pressure Display Switch: MAX., MEAN, MIN.
Pressure Wave Switch: Slow or Fast rise
Manual Breath Pushbutton
Alarm Mute and Reset

Pushbuttons:
Trigger Sensitivity Control: Range: 2ml/0.5 sec max. To 10ml/0.5sec min.

Pressure alarm setting controls: LOW CPAP: -5 to 15cmH2O

Pressure controls: INSPIRATORY

Air/Oxygen Blender Control 21-100% ± 3%

Mute active for 60 seconds (approx.)

Using SLE N2188 patient circuit.

PIP :10 to 60 cmH2O

CPAP/PEEP

6.4 Alarms

Audible only:
Loss of mains supply: Battery powered alarm

Loss of Air or O2 supply: Blender alarm.

Audible and Visual:

HIGH CIRCUIT PRESSURE
CYCLE FAIL
LOW CIRCUIT PRESSURE
FRESH GAS BLOCK
FRESH GAS LEAK or TOTAL GAS SUPPLY
FAIL SYSTEM FAIL: FAIL.

Page 55 of 120

6.5 Power , Dimensions etc.

Voltage : 100-120V/ 50-60 Hz

220-250V/ 50-60 Hz
Power : 120 VA
Fuses : 220-250V~50-60 Hz : Fuse T 1.0A

100-120V~50-60 Hz : Fuse T 2.0A
Air and O2 :4 bar

Operating Env i ronment: Temp: 10-40°C

Humidity: 0- 90% (non condensing)
Size, Ventilator only : 37 cms W × 31 cms H × 32 cms D
Height on pole: 137 cms
Weight Ventilator Only: 10 Kgs
Complies with: CE DECLARATION OF CONFORMITY

IEC 601-1 and 601-2-12 1988

BS 5724 Part 1 and section 2.12.1990

EMC Medical device 601- 1- 2
Patient Circuit Required: Model : N2188 Single use. or variant

Model : N2200 Re-usable. or variant
Transport and storage conditions Temperature -20 to 50“C for not longer than 2.5

months

Humidity 15 to 90% (non condensing) for not

longer than 2.5 months

Atmospheric pressure 500 to 1060hPa for not

longer than 2.5 months
Protection Class 1 Type B Protection against electric

Shock
Mode of operation Continuous

Page 56 of 120

Circuit Details

Page 57 of 120

7. Electronic Circuit Details

7.1 Display Board A0700/01

Page 58 of 120

7.1.1 Display Board Circuit Diagram A0700/01

Page 59 of 120

PARTS LIST
Finished Item Stock Number A0700/01
Finished Item Description Display PCB Assembly
Drawing Number AS/A0700/01 Issue 2

Part Number Component Description Qty Used Component Reference(s)

J0700 Display Board blank 1 ITEM 1 (PCB)
D0308 LED Green Rectangular LGB480EH 1 LED 6
D0546 LED Red Rectangular LSB480EH 1 LED 7
D0590 Display 7 Segment MAN4640A 15 DISP 1-7, DISP 9-16.
M0307 Terminal Pin(Pcb single sided) 3 ITEM 5
R0424 330R Resistor 1% 0.25W SMA0207 1 R408
R0416 150R Resistor 1% 0.25W SMA0207 1 R407
S0212 IC Socket 16 way DIL 2 SK1 & SK2
S0445 Socket 14 way DIL 15 ITEM 6
M0718 Label, PCB Identification 1 ITEM 7

Page 60 of 120

7.2 LED Board A0701/01

Page 61 of 120

7.2.1 LED Circuit Board Diagram CD/A0701/01

Page 62 of 120

PARTS LIST
Finished Item Stock Number A0701/01
Finished Item Description LED PCB Assembly
Drawing Number AS/A0701/01 Issue 1

Part Number Component Description Qty Used Component Reference(s)

J0701 LED pcb blank 1
D0308 LED Green Rectangular LGB480EH 3
D0508 74HC00 1 U400

D0546 LED Red Rectangular LSB480EH 6 LED 0,1,8,9,10,11
M0307 Terminal Pin(Pcb single sided) 13 ITEM 5
R0463 10K Resistor 1% 0.25W SMA0207 2 R403,404
R0416 150R Resistor 1% 0.25W SMA0207 3 R401, 402, 405
S0242 IC Socket 14 way DIL 1 ITEM 6 (U400)
M0718 Label, PCB Identification 1 ITEM 7

ITEM 1 (PCB)
LED2,3,4

Page 63 of 120

CPU Board AS/A0702/01

Issue 4: Standard board (See board drawing AS/A0702/01 issue 4 on page 65 and

circuit diagram CD/A0702/01 issue 2 on page 66).

Issue 5: Addition of capacitor C0481 to stabalise leak alarm trigger threshold

(See board drawing AS/A0702 /01 issue 5 on page 72 and circuit diagram
CD/A0702/01 issue 6 on page 73).

Also see service info rmation “SI 0 00201 Leak Alarm Trigger Threshold.” on
page 108.

Page 64 of 120

7.3 Ventilator CPU Board AS/A0702/01 Issue 4

Page 65 of 120

7.3.1 Ventilator CPU Board CD/A0702/01 Issue 2 Sheet 1 of 3

A3 version on page 91 of circuit dia gram appendix.

Page 66 of 120

7.3.2 Airway Trigger Circuit Diagram CD/A0702/01 Sheet 2 of 3

Page 67 of 120

7.3.3 Window Pressure Alarm A0702/01 Sheet 3 of 3

Page 68 of 120

PARTS LIST
Finished Item Stock Number A0702/01
Finished Item Description Ventilator CPU PCB Assembly
Drawing Number AS/A0702/01 Issue 4

Part Number Component Description Qty Used Component Reference(s)

J0702 Ventilator CPU pcb blank 1.00 Each ITEM 1 (PCB Rev D)
Check pressure transducer type (ITEM PTR2) and read note for component pre-fix.
C0256 47uF Capacitor 16V 10-20% Tan. 1.00 Each C27

C0260 10nF Capacitor 63V 20% MXS2 4.00 Each C12,C26,C32 & C500
C0434 10u Capacitor 35V 20% 5mm Lead 4.00 Each C4,C6,C15 & C28
C0439 100u Capacitor 25V 20% Elect. 1.00 Each C16
C0441 470uF Capacitor 25V 20% 1.00 Each C203
C0450 0.1uF Capacitor 63V 10% MKS2 18.00 Each C1-3,8,30,31,C33-43 &

C204
C0459 2.2uF Capacitor 50V 10% 3.00 Each C9,C201 & & C202
C0461 33pF Capacitor 100V 10% Ceram. 2.00 Each C13 & & C14
C0462 luF Capacitor 50/63V 10% MKS2 14.00 Each C5,7,11,C17-24,C29,C200

&C205
D0284 BZX79C4V7 (was BZY88C 4v7) 1.00 Each D3
D0288 LM358N 1.00 Each U500=Pt No.D0586 when

pre-fix is not ’S’ for PTR2
D0298 ICM7218DlJ1 28 Pin Harris 2 00 Each U1 & U2
D0305 ADC0809CCN NSC 1.00 Each U18
D0320 74HC132N 1.00 Each U3
D0336 BC337 4.00 Each Q1,Q2,Q500 & Q502
D0402 lN4007 Plastic Diode 2.00 Each D5 & D7 (CN0626)
D0406 1N4148 4.00 Each D1,D2,D4 & & D201
D0407 BAT85 4.00 Each D6.D202.D500.D501
D0513 74HC14 1.00 Each U4
D0525 4066 Quad Bilaterial Switch 1.00 Each U201
D0566 TL7705ACP 1.00 Each U7
D0569 BAT81 1.00 Each D200
D0570 Crystal 11.0592 MHz 1.00 Each XL1
D0571 74HCT138N 1.00 Each U5
D0572 74HCT32N 1.00 Each U9
D0573 74HCT74N 1.00 Each U15
D0574 74HCT573N 1.00 Each U16
D0575 74HCT02N 1.00 Each U17
D0576/01 27C128-20/P 1.00 Each U6
D0577 LM567CN 1.00 Each U8
D0578 74AC540 1.00 Each U10
D0579 74HC541 1.00 Each U12

Page 69 of 120

Part Number Component Description Qty Used Component Reference(s)

D0580 TLCSSSCP 1.00 Each U11
D0581 LMC660AIN 2.00 Each U13 & & U202
D0582 80C31P (Phillips) 1.00 Each U14
D0584 CD40106BE 1.00 Each U200
D0585 BC327 2.00 Each Q501 & Q503
D0636 IRLU110 power MOSFET,TO-251 1.00 Each Q4
D0638 ZTX450 1.00 Each Q3
M0626 Jumper Link 1.00 Each ITEM 5
M0660 Pad Adhesive double sided 1.00 Each ITEM 15
M0692 Transistor Pad T05 1.00 Each

M0718 Label, PCB Identification 1.00 Each ITEM 17
N2113 Pressure Transducer 142SCOlD 1.00 Each PTR1
N2176 Sensor SXOlDN (Sensym only) 1.00 Each PTR2
If N2176 is not Pre-Fixed with M on component then R501 becomes 33K(PT No.R0473) & U500

becomes LM358(PT No.D0288)
00227 Relay W172DIP-5 5V DC 1.00 Each RL1
P0230 DIN41612 64 Way 90 deg Plug 1.00 Each PLB
P0464 12way P.C.B Header Straight 0.25 Each

R0224 30K Resistor 0.25W 18 0 00 Each replaced by R0549 CN626
R0226 110K Resistor 1% 0.25W 1.00 Each R208
R0349 24K Resistor 0.25W 1% 2.00 Each R24 & & R39
R0350 1K x 8 Resistor Network 1.00 Each RU2
R0351 10K x 8 Resistor Network 1.00 Each RU1
R0416 150R Resistor 1% 0.25W SMA0207 7.00 Each R25-R29,R509 & R511
R0428 470R Resistor 1% 0.25W 1.00 Each R41
R0436 1.0K Resistor 1% 0.25W SMA0207 6.00 Each R12,R30,R31,R205-R207
R0445 2K49 Resistor 1% 0.25W SMA0207 1.00 Each R23
R0446 2.7K Resistor 1% 0.25W 0.00 Each replaced by R0461CN0626
R0449 3.32K Resistor 1% 0.25W SMA 2.00 Each R35 & & R37
R0451 3.92K Resistor 1% 0.25W SMA020 2.00 Each R38 & & R504
R0454 4.75K Resistor 1% 0.25W 1.00 Each R15
R0456 5.6K Resistor 1% 0.25W SMA0207 1.00 Each R21
R0461 8.2K Resistor 1% 0.25W 1.00 Each R32
R0462 9.09K Resistor 1% 0.25W SMA020 1.00 Each R36
R0463 10K Resistor 1% 0.25W SMA0207 10.00 Each R18,19,33,40,42,43,507,50

R0467 15K Resistor 1% 0.25W SMA0207 1.00 Each R44
R0469 22.1K Resistor 1% 0.25W SMA020 1.00 Each R204
R0470 23.7K Resistor 1% 0.25W 1.00 Each R500
R0471 27K Resistor 1k 0.25W SMA0207 3.00 Each R16,R17 & R20

LKl (3 PIN SECTION)

8,510 & R512

Page 70 of 120

Part Number Component Description Qty Used Component Reference(s)

R0473 33K Resistor 1% 0.25W 1.00 Each R501=Pt No.R0467when

pre-fix is not ’S’ for PTR2
R0479 47K Resistor 1% 0.25W SMA0207 5.00 Each R1,R3,R4,R22 & R45
R0486 100K Resistor 1% 0.25W SMA0207 7.00 Each R13,R201,202,209

,210,502,R503
R0496 470K Resistor 1% 0.25W SMA0207 1.00 Each R14
R0499 750K Resistor 1% 0.25W 1.00 Each R203
R0501 1.0M Resistor 1% 0.25W SMA0207 2.00 Each R211 & R212
R0504 2.2M Resistor 16 0.25W 1.00 Each R2
R0506 3.3M Resistor 1% 0.25W SMA0207 3.00 Each Rll,R505 & R506
R0549 91K Resistor 1% 0.25w 1.00 Each R34
R0555 470K x 8 Resistor Network 1.00 Each RU3
R0556 10K x 8 Resistor Network 1.00 Each RU4
R0571 10k Resistor 1% 0.125W M/Film 2.00 Each R213 & R214
S0209 IC Socket 28 way DIL 4.00 Each ITEM 12
S0212 IC Socket 16 way DIL 5.00 Each ITEM 10 (U5,RU1,2,SKl &

SK2)
S0227 IC Socket 40 way DIL 1.00 Each ITEM 13
S0237 IC Socket 20 way DIL 3.00 Each ITEM 11
S0241 IC Socket 8 way DIL 4.00 Each ITEM 8 (U7,8,11& U500 )
S0242 IC Socket 14 way DIL 9.00 Each

T0205 Alarm Transducer Bracket 1.00 Each ITEM 3
V0404 5.0K Trimmer,cermet,top adjust 3.00 Each RV6-RV8
V0405 10K Trimmer, cermet, top adj 5.00 Each RV2-RV5 & RV10
V0406 20K Trimmer cermet,top adju st 2.00 Each RV9,RV202
V0408 100K Trimmer, cermet, top adj 1.00 Each RV1
V0410 500K Trimmer 1.00 Each RV200
V0414 10K Trimmer, cermet, top adj 3.00 Each RV500-RV502
H3116 M3 x 16 Pan Hd Pozi s.st 2.00 Each ITEM 22
H3108 M3 x 8 Pan Hd Pozi s.st 2.00 Each ITEM 21
H3225 M3 x 25 Csk Hd Pozi s.st 2.00 Each ITEM 23
H2312 M2.5 x 12 Pan Hd Pozi s.st 2.00 Each ITEM 20
H3091 M3 Nut Full s.st 6.00 Each ITEM 26
H2591 M2.5 Nut Full s.st 2.00 Each ITEM 25
H2595 M2.5 Plain Nylon Washer 2.00 Each ITEM 32
H3094 M3 S/Proof Washer s.st DIN6798 6.00 Each ITEM 28
H3095 M3 Plain Washer Nylon 6.00 Each ITEM 30
H3093 M3 Plain Washer B . st 2.00 Each ITEM 29

ITEM 9

Page 71 of 120

7.4 Ventilator CPU Board AS/A0702/01 Issue 5

Page 72 of 120

7.4.1 Ventilator CPU Board CD/A0702/01 Issue 6

A3 version on page 93 of circuit dia gram appendix.

Page 73 of 120

PARTS LIST
Finished Item Stock Number A0702/01
Finished Item Description Ventilator CPU PCB Assembly
Drawing Number AS/A0702/01 Issue 5

Part Number Component Description Qty Used Component Reference(s)

J0702 Ventilator CPU pcb blank 1.00 Each ITEM 1 (PCB Rev D)
Check pressure transducer type (ITEM PTR2) and read note for component pre-fix.
C0256 47uF Capacitor 16V 10-20% Tan. 1.00 Each C27

C0260 10nF Capacitor 63V 20% MXS2 4.00 Each C12,C26,C32 & C500
C0434 10u Capacitor 35V 20% 5mm Lead 4.00 Each C4,C6,C15 & C28
C0439 100u Capacitor 25V 20% Elect. 1.00 Each C16
C0441 470uF Capacitor 25V 20% 1.00 Each C203
C0450 0.1uF Capacitor 63V 10% MKS2 18.00 Each C1-3,8,30,31,C33-43 &

C204
C0459 2.2uF Capacitor 50V 10% 3.00 Each C9,C201 & & C202
C0461 33pF Capacitor 100V 10% Ceram. 2.00 Each C13 & & C14
C0462 luF Capacitor 50/63V 10% MKS2 14.00 Each C5,7,11,C17-24,C29,C200

& C205
C0481 100nf Capacitor 50v 1.00 Each C2
D0284 BZX79C4V7 (was BZY88C 4v7) 1.00 Each D3
D0288 LM358N 1.00 Each U500=Pt No.D0586 when

pre-fix is not ’S’ for PTR2
D0298 ICM7218DlJ1 28 Pin Harris 2 00 Each U1 & U2
D0305 ADC0809CCN NSC 1.00 Each U18
D0320 74HC132N 1.00 Each U3
D0336 BC337 4.00 Each Q1,Q2,Q500 & Q502
D0402 lN4007 Plastic Diode 2.00 Each D5 & D7 (CN0626)
D0406 1N4148 4.00 Each D1,D2,D4 & & D201
D0407 BAT85 4.00 Each D6.D202.D500.D501
D0513 74HC14 1.00 Each U4
D0525 4066 Quad Bilaterial Switch 1.00 Each U201
D0566 TL7705ACP 1.00 Each U7
D0569 BAT81 1.00 Each D200
D0570 Crystal 11.0592 MHz 1.00 Each XL1
D0571 74HCT138N 1.00 Each U5
D0572 74HCT32N 1.00 Each U9
D0573 74HCT74N 1.00 Each U15
D0574 74HCT573N 1.00 Each U16
D0575 74HCT02N 1.00 Each U17
D0576/01 27C128-20/P 1.00 Each U6
D0577 LM567CN 1.00 Each U8
D0578 74AC540 1.00 Each U10

Page 74 of 120

Part Number Component Description Qty Used Component Reference(s)

D0579 74HC541 1.00 Each U12
D0580 TLCSSSCP 1.00 Each U11
D0581 LMC660AIN 2.00 Each U13 & & U202
D0584 CD40106BE 1.00 Each U200
D0585 BC327 2.00 Each Q501 & Q503
D0636 IRLU110 power MOSFET,TO-251 1.00 Each Q4
D0638 ZTX450 1.00 Each Q3
D0644/01 P80C32EBPN 8-bit CMOS CPU 1.00 Each U14
M0626 Jumper Link 1.00 Each ITEM 5
M0660 Pad Adhesive double sided 1.00 Each ITEM 15
M0692 Transistor Pad T05 1.00 Each

M0718 Label, PCB Identification 1.00 Each ITEM 17
N2113 Pressure Transducer 142SCOlD 1.00 Each PTR1
N2176 Sensor SXOlDN (Sensym only) 1.00 Each PTR2
If N2176 is not Pre-Fixed with M on component then R501 becomes 33K(PT No.R0473) & U500

becomes LM358(PT No.D0288)
00227 Relay W172DIP-5 5V DC 1.00 Each RL1
P0230 DIN41612 64 Way 90 deg Plug 1.00 Each PLB
P0464 12way P.C.B Header Straight 0.25 Each LKl (3 PIN SECTION)
R0224 30K Resistor 0.25W 18 0 00 Each replaced by R0549

CN0626
R0226 110K Resistor 1% 0.25W 1.00 Each R208
R0349 24K Resistor 0.25W 1% 2.00 Each R24 & & R39
R0350 1K x 8 Resistor Network 1.00 Each RU2
R0351 10K x 8 Resistor Network 1.00 Each RU1
R0416 150R Resistor 1% 0.25W SMA0207 7.00 Each R25-R29,R509 & R511
R0428 470R Resistor 1% 0.25W 1.00 Each R41
R0436 1.0K Resistor 1% 0.25W SMA0207 6.00 Each R12,R30,R31,R205-R207
R0445 2K49 Resistor 1% 0.25W SMA0207 1.00 Each R23
R0446 2.7K Resistor 1% 0.25W 0.00 Each replaced by R0461CN0626
R0449 3.32K Resistor 1% 0.25W SMA 2.00 Each R35 & & R37
R0451 3.92K Resistor 1% 0.25W SMA020 2.00 Each R38 & & R504
R0454 4.75K Resistor 1% 0.25W 1.00 Each R15
R0456 5.6K Resistor 1% 0.25W SMA0207 1.00 Each R21
R0461 8.2K Resistor 1% 0.25W 1.00 Each R32
R0462 9.09K Resistor 1% 0.25W SMA020 1.00 Each R36
R0463 10K Resistor 1% 0.25W SMA0207 10.00 Each R18,19,33,40,42,43,507,50

8,510 & R512
R0467 15K Resistor 1% 0.25W SMA0207 1.00 Each R44
R0469 22.1K Resistor 1% 0.25W SMA020 1.00 Each R204
R0470 23.7K Resistor 1% 0.25W 1.00 Each R500

Page 75 of 120

Part Number Component Description Qty Used Component Reference(s)

R0471 27K Resistor 1k 0.25W SMA0207 3.00 Each R16,R17 & R20
R0473 33K Resistor 1% 0.25W 1.00 Each R501=Pt No.R0467when

pre-fix is not ’S’ for PTR2
R0479 47K Resistor 1% 0.25W SMA0207 5.00 Each R1,R3,R4,R22 & R45
R0486 100K Resistor 1% 0.25W SMA0207 7.00 Each R13,R201,202,209

,210,502,R503
R0496 470K Resistor 1% 0.25W SMA0207 1.00 Each R14
R0499 750K Resistor 1% 0.25W 1.00 Each R203
R0501 1.0M Resistor 1% 0.25W SMA0207 2.00 Each R211 & R212
R0504 2.2M Resistor 16 0.25W 1.00 Each R2
R0506 3.3M Resistor 1% 0.25W SMA0207 3.00 Each Rll,R505 & R506
R0549 91K Resistor 1% 0.25w 1.00 Each R34
R0555 470K x 8 Resistor Network 1.00 Each RU3
R0556 10K x 8 Resistor Network 1.00 Each RU4
R0571 10k Resistor 1% 0.125W M/Film 2.00 Each R213 & R214
S0209 IC Socket 28 way DIL 4.00 Each ITEM 12
S0212 IC Socket 16 way DIL 5.00 Each ITEM 10 (U5,RU1,2 ,SKl &

SK2)
S0227 IC Socket 40 way DIL 1.00 Each ITEM 13
S0237 IC Socket 20 way DIL 3.00 Each ITEM 11
S0241 IC Socket 8 way DIL 4.00 Each ITEM 8 (U7,8,11&U500 )
S0242 IC Socket 14 way DIL 9.00 Each ITEM 9
T0205 Alarm Transducer Bracket 1.00 Each ITEM 3
V0404 5.0K Trimmer,cermet,top adjust 3.00 Each RV6-RV8
V0405 10K Trimmer, cermet, top adj 5.00 Each RV2-RV5 & RV10
V0406 20K Trimmer cermet,top adju st 2.00 Each RV9,RV202
V0408 100K Trimmer, cermet, top adj 1.00 Each RV1
V0410 500K Trimmer 1.00 Each RV200
V0414 10K Trimmer, cermet, top adj 3.00 Each RV500-RV502
H3116 M3 x 16 Pan Hd Pozi s.st 2.00 Each ITEM 22
H3108 M3 x 8 Pan Hd Pozi s.st 2.00 Each ITEM 21
H3225 M3 x 25 Csk Hd Pozi s.st 2.00 Each ITEM 23
H2312 M2.5 x 12 Pan Hd Pozi s.st 2.00 Each ITEM 20
H3091 M3 Nut Full s.st 6.00 Each ITEM 26
H2591 M2.5 Nut Full s.st 2.00 Each ITEM 25
H2595 M2.5 Plain Nylon Washer 2.00 Each ITEM 32
H3094 M3 S/Proof Washer s.st DIN6798 6.00 Each ITEM 28
H3095 M3 Plain Washer Nylon 6.00 Each ITEM 30
H3093 M3 Plain Washer B . st 2.00 Each ITEM 29

Page 76 of 120

7.5 RS232/423 Option

Page 77 of 120

PARTS LIST
Finished Item Stock Number A0702/03
Finished Item Description RS232/423 option.(A0702 PCB)

Part Number Component Description Qty Used Component Reference(s)

D0643 HPCL 2730 2 U2 0,2 1
D0640 UA96 36ACP 1 U22
D0593 NMA0512D 1 U23
D0432 LM7805CT Regulator 1 U24
D0250 BZX79C6V8 2 D300,301
R0443 2.2K Resistor 1% 0.25W SMA0207 2

R0432 680R Resistor 1% 0.25W 2 R302,303
R0425 332R Resistor 1% 0.25W SMA0207 2 R304,305
R0436 1.0K Resistor 1% 0.25W SMA0207 2 R306,307
R0343 300K 1% 50PPM 0.25W 1 R308
R0557 1K0 Resistor 5% 1W 250PPM PR01 2 R309,310
C0433 1uF Capacitor 35V 20% Tantalum 1

C0450 0.1uF Capacitor 63V 10% MKS2 1 C301
S0241 IC Socket 8 way DIL 3 U20,21,22
S0242 IC Socket 14 way DIL 1 SK3

R300,301

C300

Page 78 of 120

7.6 Power Supply, Alarms and Oxygen Signal Conditioner (A0703)

Page 79 of 120

7.6.1 Power Supply Circuit Diagram CD/A0703/01

A3 version on page 95 of circuit dia gram appendix.

Page 80 of 120

PARTS LIST
Finished Item Stock Number A0703/01
Finish-d Item Description PSU Pcb Assembly
Drawing Number AS/A0703/01 Issue 3

Part Number Component Description Qty Used Component Reference(s)

J0703 PSU Pcb A0703 Rev.B. 1.00 Each ITEM 1 (PCB)
C0214 330pf 100v Ceramic 10% PCM5 1.00 Each C104
C0252 2200uF Capacitor 25V 20% 1.00 Each C102 (fix to pcb using

silicone rubber compound)
C0450 0.1uF Capacitor 63V 10% MKS2 1.00 Each C103
C0462 luF Capacitor 50/63V 10t MKS2 1.00 Each C100
C0463 47uF Capacitor 100V 208 0.00 Each replaced by C0517
C0517 220uF Capacitor 100 Volts 20% 1.00 Each C101
D0402 lN4007 Plastic Diode 0.00 Each replaced by D0711
D0711 Zener Diode lN5359B 24v 5w 1.00 Each D102
D0411 KBPC104 Bridge Rectifier 2.00 Each D100,D101
D0427 LM336Z5/0 Diode 1.00 Each D103
D0537 LM317T 1.00 Each U101
D0583 LT1006CN& 1.00 Each U100
D0636 IRLU110 power MOSFET, TO-251 1.00 Each Q100
M0228 Heat Sink TO-220 1.00 Each ITEM 5
M0307 Terminal Pin(Pcb single sided) 33.00 Each ITEM 7
M0309/01 H12 x 20mm Sleeve (1.2mm I/D) 2.00 Each ITEM 9
M0458/01 Heatsink (Drilled) 2.00 Each ITEM 6
M0463 T0220 Transistor Heatsink 1.00 Each ITEM 2
M0626 Jumper Link 1.00 Each ITEM 3 (LK2)
M0718 Label, PCB Identification 1.00 Each ITEM 8
N2082 SMB-01 Audible Alarm 1.00 Each BZ4
N2096 SMA-24L Audible Alarm 98dB 3.00 Each BZ1-BZ3
P0464 12way P.C.B Header Straight 0.10 Each LK2 (Cut into 2 Pin

Section)
R0270 620R Resistor 1% 0.25W SMA0207 1.00 Each R113
R0355 240R Resistor 1% 0.25W SMA0207 1.00 Each R115
R0405 10R Resistor 1% 0.25W SMA0207 1.00 Each R102
R0413 100R Resistor 1% 0.25W SMA0207 1.00 Each R107
R0424 330R Resistor 1% 0.25W SMA0207 1.00 Each R117
R0425 332R Resistor 1% 0.25W SMA0207 1.00 Each R103
R0436 1.0K Resistor 1% 0.25W SMA0207 3.00 Each R109,116,121
R0445 2K49 Resistor 1% 0.25W SMA0207 3.00 Each R101,104,105
R0448 3K16 Resistor 1% 0.25W SMA0207 1.00 Each R112
R0449 3.32K Resistor 1% 0.25W SMA 1.00 Each R122

Page 81 of 120

Part Number Component Description Qty Used Component Reference(s)

R0457 6K8 Resistor 1% 0.25W SMA0207 1.00 Each R111
R0463 10K Resistor 1% 0.25W SMA0207 1.00 Each R114
R0469 22.1K Resistor 1% 0.25W SMA020 1.00 Each R120
R0478 45K3 Resistor 1% 0.25W SMA0207 1.00 Each R108
R0501 1.0M Resistor 1% 0.25W SMA0207 1.00 Each R100
R0553 330R Resistor 5W HS10 (ARCOL) 2.00 Each R106,110
R0650 56R Resistor 5% 6w W22 Series 1.00 Each Fitted at LK1
S0241 IC Socket 8 way DIL 1.00 Each ITEM 4 (U100)
V0401 200R Trimmer, cermet, top adj. 1.00 Each RV102
V0426 5K Trimmer, cermet, top adjust 1.00 Each RV101
H2108 M2 x 8 Pan Hd Pozi s.st 6.00 Each ITEM 10 & 11
H3108 M3 x 8 Pan Hd Pozi s.st 1.00 Each ITEM 12
H2091 M2 Nut Full s.st 6.00 Each ITEM 20
H3091 M3 Nut Full s.st 1.00 Each ITEM 21
H2094 M2 Shakeproof Washer s.st 6.00 Each ITEM 30
H2093 M2 Plain Washer s.st. 6.00 Each ITEM 40
H3095 M3 Plain Washer Nylon 1.00 Each ITEM 50
W0103 Wire Wrapping Kynar red 30awg 0.01 metre Link Wire

Page 82 of 120

7.7 CD/W0288 Wireloom

A3 version on page 97 of circuit dia gram appendix

Page 83 of 120

7.8 Electronic Chassis

Page 84 of 120

7.8.1 Electronic Chassis

Page 85 of 120

PARTS LIST
Finished Item Stock Number L0104
Finished Item Description 2000 Electronic Assy’ Stg2 EMC
Drawing Number AS/L0104 See Drg File

Part Number Component Description Qty Used Component Reference(s)

L0105 2000 Electronic Assy’ Stgl EMC 1 00 Each ITEM 1
A0700/01 Display Pcb Assembly 1 00 Each ITEM 2
A0701/01 LED Pcb Assembly 1 00 Each ITEM 3
A0702/01 Ventilator CPU PCB Assembly 1 00 Each ITEM 4
A0703/01 PSU Pcb Assembly 1 00 Each ITEM 5
W0288 Wiring Loom SLE2000 El/tronic 1 00 Each ITEM 6 Ensure clearance from

inner covers

L0104/00 Kit of Assy’ Pts 2000 Stg2 EMC 1 00 Each All other assy’ parts

PARTS LIST
Finished Item Stock Number L0104/00
Finished Item Description Kit of Assy’ Pts 2000 Stg2 EMC
Drawing Number AS/L0104 Issue 4

Part Number Component Description Qty Used Component Reference(s)

D0406 lN4148 1 00 Each ITEM D1(fitted to SW1)
M0706/03 Label,Hazard Flash (25sq ) 1 00 Each ITEM 7
M0271/01 P C B. Guide Drg 100709 4 00 Each ITEM 8
M0309/01 H12 x 20mm Sleeve (1 2mm I/D) 60 00 Each ITEM 9 Use as required
M0433/01 Cable Tie Bases S/A Small 1 00 Each ITEM 10
M0434 CableATie (Electrical use) 1 00 Each ITEM 11
M0660 Pad Adhesive double sided 3 00 Each ITEM 12
N2369 4 5 M5 Hosetail - Male 4 00 Each ITEM 13
N2371 2661 M5 Washer Nylon 4 00 Each ITEM 14
00413 Mode Rotary Switch RA3041 1 00 Each SW1
P0211/01 Shroud for P0234 1 00 Each ITEM 15
R0602 lk 18 0 5W Resistor MFR4 1 00 Each Solder to pin 4 on SKA inline

wire no 38 cover with heat

shrink sleeve
T0206/01 Spacer - aluminium 7 00 Each ITEM 16
T0206/02 Spacer - Nylon 3/8"0D x 4 5ID 1 00 Each Replaces ITEM 16 near

transformer
T0209 Knurled Thumb Nut Nylon 66 9 00 Each ITEM 19
T0211 PCB Retainer 2 00 Each ITEM 20
T0212 Through Connector Block 2 00 Each ITEM 21
T0286 Transformer shield 1 00 Each ITEM 22
H3091 M3 Nut Full s st 8 00 Each ITEM 30
H3093 M3 Plain Washer s st 4 00 Each ITEM 31

Page 86 of 120

Part Number Component Description Qty Used Component Reference(s)

H3094 M3 S/Proof Washer s st DIN6798 8 00 Each ITEM 32
H3106 M3 x 6 Pan Hd Pozi s st 2 00 Each ITEM 33
H3208 M3 x 8 Csk Hd Pozi s st 2 00 Each ITEM 35
H3220 M3 x 20 Csk Hd Pozi s st 2 00 Each ITEM 36
H4125 M4 x 25 Pan Hd Pozi s st 8 00 Each ITEM 38

Page 87 of 120

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Page 88 of 120

8. A3 Circuit Diagram Appendix

A3 circuit Diagram

Appendix

Page 89 of 120

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Ventilator CPU board CD/A0702/01 Issue 2

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Ventilator CPU board CD/A0702/01 Issue 6

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Power Supply Circuit Diagram CD/A0703/01 Issue 4

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CD/W0288 Wireloom

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and Technical Bulletins

Service Information

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9. Service Information and Technical bulletins

The following are al l the cu rre nt Serv ice I nforma tion and Tech nica l Bull etin s that have
been issued for the SLE 2000 ventilator.

Service Information Letters (see page 101)

SI 980301 Ventilator Alarms and INOSYS Nitric Oxide Delivery System
SI 980302 Ve ntilator oxygen cells (N2191)
SI 990101 Ventilator Alarms and INOSYS Nitric Oxide Delivery System
SI 990302 Pos sible inadvert ant solenoid failure messages
SI 000201 Leak A l arm Trigger Threshold.

Technical Bulletins (see page 110)

TB 990603 Removal of hour counter from electrical chassis.
TB 000201 New versions of control software.
TB 000801 Ventilator firmware history.

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