NORTH AMERICAN DRÄGER Drager Narkomed MRI User manual

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Technical

Service

Manual

Part Number: 4114210

Date: 4 May 2004

Rev: T

Narkomed MRI

Narkomed MRI-2

Anesthesia Systems

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Narkomed MRI Service Manual Table of Contents

What's New in Rev. T

DESCRIPTION

SECTION 1: Introduction

1.1 Recommendations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1.2 How to use this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1.3 General Troubleshooting Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1.4 General Warnings and Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

SECTION 2: Diagnostics

2.1 Power-up Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

2.2 Main Service Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

2.3 Service Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

2.4 PMS Criteria Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

2.5 Oxygen Monitor Service Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

2.6 Pressure Monitor Service Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

SECTION 3: Troubleshooting

3.1 Power Supply and Voltage Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3.2 Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

3.3 Troubleshooting Guides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

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SECTION 4: Replacement Procedures

4.1 Cylinder Yoke Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

4.2 Cylinder Pressure Regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

4.3 Cylinder Cutoff Valves (Canada) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

4.4 Cylinder and Pipeline Pressure Gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

4.5 Flowmeters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

4.6 Flow Control Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19

4.7 Auxiliary O2 Flowmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22

4.8 Oxygen Supply Failure Protection Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24

4.9 Alarm Channel and Oxygen Supply Pressure Alarm Switch . . . . . . . . . . . . . 4-27

4.10 Oxygen Ratio Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31

4.11 Vaporizers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34

4.12 O2 Flush Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-37

4.13 Core-M Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40

4.13A VPO Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-41A

4.14 AV2+ Ventilator Controller (MRI) (Bezel Assembly) . . . . . . . . . . . . . . . . . . 4-42

4.15 Ventilator Solenoid Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-45

4.16 Ventilator Bellows Valve & Guide Asm w/Press Lim Ctrl . . . . . . . . . . . . . . 4-47

4.17 Caster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-51

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NM MRI

DESCRIPTION

4.18 Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-53

4.19 Power Supply PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-55

4.20 Primary Power supply (early models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-57

4.20A Primary Power supply (later design) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-58A

4.21 Power Supply Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-59

4.22 Flow Sensor: Machines with VPO Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-61

SECTION 5: Adjustment And Calibration Procedures

5.1 Cylinder Pressure Regulator Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

5.2 Oxygen Supply Pressure Alarm Switch Adjustment . . . . . . . . . . . . . . . . . . . . . 5-5

5.3 Oxygen Ratio Controller (ORC) Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

5.4 Oxygen Monitor Calibration: Core-M Monitor . . . . . . . . . . . . . . . . . . . . . . . . . 5-10

5.5 Flow and Pressure Calibration: Core-M Monitor . . . . . . . . . . . . . . . . . . . . . . 5-11

5.6 Oxygen Sensor Calibration: VPO Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12

5.7 Breathing Pressure Monitor Calibration: VPO Monitor . . . . . . . . . . . . . . . . . 5-14

5.8 Vaporizer Interlock Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16

SECTION 6: Periodic Manufacturer’s Service (PMS) Procedure

6.1 Safety Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

6.2 Self-Diagnostics: Core-M Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

6.2A Self-Diagnostics: VPO Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4A

6.2B Configuration: VPO Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4A

6.2C Service Data: VPO Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4B

6.3 Battery Circuit Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

6.4 High Pressure Leak Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6

6.5 High Pressure Regulator Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8

6.6 Gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9

6.7 Oxygen Supply Failure Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10

6.8 Flowmeter Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11

6.9 Freshgas Leak Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13

6.10 Absorber System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14

6.10A Bain Circuit Adapter - if applicable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17A

6.10B Vapor Exclusion System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17B

6.11 Flow and Pressure Calibration: Core-M Monitor . . . . . . . . . . . . . . . . . . . . . 6-17C

6.11A Flow and Pressure Calibration: VPO Monitor . . . . . . . . . . . . . . . . . . . . . . 6-17D

6.12 Oxygen Cal and Alarm Test: Core-M Monitor . . . . . . . . . . . . . . . . . . . . . . . . 6-18

6.12A O2 MED: VPO Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-18A

6.13 Pressure Accuracy Test: Core-M Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-19

6.13A Baromed: VPO Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-19A

6.14 APNEA and Volume Alarm Test: Core-M Monitor. . . . . . . . . . . . . . . . . . . . . 6-20

6.14A Ultrasonic Flow Sensor: VPO Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21A

6.15 Ventilator Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-22

6.16 Bellows Drive Gas Leak Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-23

6.17 “F” Bellows Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-24

6.18 Ventilator Relief Valve Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-24

6.19 Inspiratory Pressure Limit Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-25

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NM MRI

CONTENTS (continued)

DESCRIPTION PAGE

6.20 Oxygen Concentration Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-25

6.21 Oxygen Ratio Control (ORC) Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-27

6.22 Oxygen Flush and 100% O2 Final Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-28

6.23 Scavenger Interface, A/C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-29

6.24 Open Reservoir Scavenger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-30

6.25 Suction Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-32

6.26 Final Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-32

SECTION 7: Software Update Procedure

7.1 Software Transfer to PC via Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

7.2 Installing NM MRI Software from a PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

SECTION 8: Spare and Replacement Parts

AV-2+ Ventilator Controller (Bezel) Assembly and Remote Solenoid . . . . . . . . . . . . . . 8-2, 8-3

Bellows Valve Assembly, Pressure Limit Control, Bellows Assembly. . . . . . . . . . . . . . 8-4, 8-5

Bellows Valve Assembly details. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6, 8-7

DISS Pipeline Inlets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-8, 8-9

Failsafe Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-10, 8-11

ORC Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-12, 8-13

Alarm Channel Assembly and related cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-14, 8-15

Flowmeter Shields, Knobs, Labels, Gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-16, 8-17

Flow Tubes, Restrictor Assemblies, Flow Control Valve . . . . . . . . . . . . . . . . . . . . . . 8-18, 8-19

Auxiliary O Cyl. Regulator Assemblies, O

Flowmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-20, 8-21

Flush Valve and related parts . . . . . . . . . . . . . . . . . 8-22, 8-23

CSA Items: Relief Valve, Cylinder Cutoff Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-24, 8-25

Yokes, Common Parts, Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-26, 8-27

Absorber Pole, Casters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-28, 8-29

Power Supply/Charger Assembly, Power Cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-30, 8-31

Filter Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-32, 8-33

Battery Box Assembly, machines with Core-M monitor . . . . . . . . . . . . . . . . . . . . . . 8-34, 8-35

Battery Box Assembly, machines with VPO monitor. . . . . . . . . . . . . . . . . . . . . . . . . 8-36, 8-37

Absorber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-38, 8-39

Man/Auto Selector Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-40, 8-41

Open Reservoir Scavenger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-42, 8-43

A/C Scavenger. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-44, 8-45

Core-M Monitor, Vol & O2 Sensors, Touch-up paint: Euro white, Euro blue . . . . . . 8-46, 8-47

VPO Monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-48, 8-49

Ultrasonic Flow Sensor Assembly and related parts . . . . . . . . . . . . . . . . . . . . . . . . . 8-50, 8-51

Suction Assembly with Re-usable Canister . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-52, 8-53

Vaporizer Mounting and Exclusion System parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-54, 8-55

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Narkomed MRI Anesthesia System

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VENTILATOR

VPO MONITOR

VENTILATOR BELLOWS

MAIN SWITCH PANEL

FLOWMETER

BANK

VAPORIZER

SCAVENGER (OPEN RESERVOIR)

ABSORBER

POWER SUPPLY

PRESSURE

GAUGES

SV00070

1-0

Rev. E

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NM MRI

INTRODUCTION

1.0 INTRODUCTION

1.1 Recommendations

Because of the sophisticated nature of Draeger Medical, Inc. anesthesia equipment and its critical importance in the operating room setting, it is highly recommended that only appropriately trained and experienced professionals be permitted to service and maintain this equipment. Please contact DrägerService

Draeger Medical, Inc. also recommends that its anesthesia equipment be serviced at three-

month intervals. Periodic Manufacturer's Service Agreements are available for equipment manufactured by

Draeger Medical, Inc. For further information concerning these agreements,

please contact us at (800) 543-5047.

Draeger Medical, Inc. products/material in need of factory repair shall be sent to:

1.2 How to use this Manual

at (800) 543-5047 for service of this equipment.

DrägerService 3124 Commerce Drive Telford, PA 18969 U.S.A. (Include RMA Number)

The manual is divided into several sections. The DIAGNOSTICS section describes self-test and service diagnostics for checking the system functions. An understanding of the on-board service capabilities is necessary before any attempt is made to troubleshoot the unit. The TROUBLESHOOTING section provides troubleshooting guides to assist the Technical Service Representative (TSR) in locating the source of a problem. The REPLACEMENT PROCEDURES section contains instructions for removal and replacement of the assemblies that are considered field-replaceable. The ADJUSTMENT AND CALIBRATION PROCEDURES section contains the field procedures needed to restore original system specifications. The Periodic Manufacturer's Service (PMS) PROCEDURE section outlines the steps required to verify the electrical, mechanical and pneumatic safety of the unit and also identifies components requiring periodic replacement.

1.3 General Troubleshooting Guidelines

Troubleshooting the Narkomed MRI should always begin by communicating with those who observed or experienced a problem with the unit. This may eliminate unnecessary troubleshooting steps. Once a general problem is identified, refer to the troubleshooting flow charts in Section 3 to determine the proper corrective action to be taken.

After a component has been replaced, verify that the unit is operating properly by running the appropriate diagnostic procedure. The PMS PROCEDURE in Section 6 must also be performed after any component has been replaced.

The general arrangement of the Narkomed MRI Anesthesia System is shown on the opposite page.

WAR NING S are used in this manual before procedures which if not performed correctly could result in personal injury.

CAUTIONS are used in this manual to alert service personnel to the possibility of damage to the equipment if a procedure is not performed correctly.

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INTRODUCTION (continued)

NM MRI

1.4 General Warnings and Cautions

The following list of warnings and cautions apply to general operation and maintenance of the Narkomed MRI. Warnings and cautions about installing and operating specific parts appear with those topics.

WARNING: The user of this anesthesia machine must comply with warnings, cautions,

and checkout procedures printed on the machine or on the pullout panel. Failure to do so may result in injury to the patient, operator, others, or equipment.

WARNING: Any person involved with the setup, operation, or maintenance of the

Narkomed MRI anesthesia system must be thoroughly familiar with this instruction manual.

WARNING: Do not place any object on this machine unless it is specifically labeled to be

used in an MRI scanning room and on the Narkomed MRI anesthesia system. Objects placed on this machine that are not designed for use with this anesthesia system may be strongly attracted to the magnet and may cause serious injury or death when the machine is used in an MRI scanning room.

WARNING: Always lock the casters after this anesthesia machine has been positioned in

the MRI scanner room. Magnetic attractive forces between the magnet and the anesthesia machine may cause unintentional movement of the anesthesia machine if the casters are unlocked.

WARNING: The power supply charger assembly must not be taken into the magnet room.

Damage to the equipment, MRI system, or personal injury could result.

WARNING: The Narkomed MRI has been tested only with magnets having field strengths

of up to 1.5 tesla. Moving the machine near higher strength magnets (greater than 1.5 tesla) could result in machine malfunction or unmanageable attractive forces that could lead to serioius injury or death.

WARNING: The Narkomed MRI-2 has been tested with magnets having field strengths of

up to 3.0 tesla. Moving the machine near higher strength magnets (greater than 3.0 tesla) could result in machine malfunction or unmanageable attractive forces that could lead to serious injury or death.

WARNING: This anesthesia system will not respond automatically to certain changes in

patient condition, operator error, or failure of components. The system is designed to be operated under the constant surveillance and control of a qualified operator.

WARNING: Use only nonmagnetic (aluminum) E-cylinders with this machine. Steel

cylinders can cause serious injury or death if brought into an MRI scanning room.

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NM MRI

INTRODUCTION (continued)

WARNING: No third-party components shall be attached to the anesthesia machine,

ventilator, or breathing system (except for certain approved exceptions). Contact

DrägerService

for further information. DrägerService

is a division of

Draeger Medical, Inc.

WARNING: Not for use with flammable anesthetics. To avoid explosion hazards, do not

use flammable anesthetic agents such as diethyl-ether and cyclopropane with this machine. Only anesthetic agents which comply with the requirements for non-flammable anesthetic agents per IEC standard or national equivalent shall be used with this anesthesia machine.

CAUTION: When moving the machine, be sure to set the absorber to its lowest position on

the absorber pole. To avoid personal injury or damage to the unit, do not use the absorber pole to push or pull the machine. It is recommended that two people move the machine to aid in maneuverability on inclines, around corners, and over raised thresholds.

CAUTION: The Narkomed MRI is designed for MRI use only as a system. The user should

not assume that individual components of the system can be safely used with MRI scanners.

CAUTION: Although the Narkomed MRI is designed to minimize the effects of ambient

radio-frequency interference, machine functions may be adversely affected by the operation of electrosurgical equipment or short-wave or microwave diathermy equipment in the vicinity.

The following messages appear in French on the Narkomed MRI:

ATTENTION: Lors du déplacement de l'appareil, veiller à placer l'absorbeur le plus bas

possible sur le montant. Pour éviter tout risque de blessure corporelle ou endommagement de l'appareil, ne pas pousser ou tirer sur le montant de l'absorbeur pour déplacer l'appareil. Il est recommandé que deux personnes déplacent l'appareil sur des plans inclinés, dans des angles et pour passer des seuils surélevés.

AVERTISSEMENT: L'utilisateur de l'appareil d'anesthésie doit se conformer aux

avertissements, mises en garde et procédures de vérification imprimés sur l'appareil ou sur le panneau rétractable. Négliger de faire cela risque de provoquer des blessure chez le patient, l'opérateur ou d'autres personnes et risque également d'endommagement l'appareil.

AVERTISSEMENT: Toute personne chargée de la préparation, de l'utilisation ou de

l'entretien de l'appareil d'anesthésie Narkomed MRI doit très bien connaître le contenu de ce manuel d'utilisation.

1-3

Page 10

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INTRODUCTION (continued)

NM MRI

AVERTISSEMENT: Ne placer aucun objet sur cet appareil à moins qu'il n'ait été

spécifiquement approuvé pour l'utilisation dans une salle IRM avec un appareil d'anesthésie Narkomed MRI. Tout objet non conforme déposé sur cet appareil pourrait être fortement attiré par l'aimant et pourrait occasionner des blessures graves ou fatales lorsque l'appareil d'anesthésie est utilisé dans la salle IRM.

AVERTISSEMENT: Toujours bloquer les roues après avoir placé cet appareil d'anesthésie

à l'endroit voulu dans la salle IRM. Les forces d'attraction magnétique entre l'aimant et l'appareil d'anesthésie peuvent provoquer un déplacement imprévu de ce dernier si les roues ne sont pas bloquées.

AVERTISSEMENT: Ne pas amener le chargeur de batterie dans la salle IRM car cela

présenterait un risque d'endommagement du matériel et du système IRM, ou de blessure corporelle.

AVERTISSEMENT: Cet appareil d'anesthésie Narkomed MRI a été vérifiée avec des

aimants possédant des champs magnétiques jusqu’á 1,5 tesla. Installé l’appareil prés d’un aimant plus puissant (plus de 1,5 tesla) pourrait amener l’appareil á mal monctionner ou produire des forces d’attractions incontrôlables qui pourait causer des blessures sérieuses ou la mort.

AVERTISSEMENT: Cet appareil d'anesthésie Narkomed MRI-2 a été vérifiée avec des

aimants possédant des champs magnétiques jusqu’á 3,0 tesla. Installé l’appareil prés d’un aimant plus puissant (plus de 3,0 tesla) pourrait amener l’appareil á mal monctionner ou produire des forces d’attractions incontrôlables qui pourait causer des blessures sérieuses ou la mort.

AVERTISSEMENT: Ce système d'anesthésie ne réagit pas automatiquement à certains

changements de l'état physiologique du patient, aux erreurs de l'opérateur ou aux défaillances des composants. Il a été conçu de manière à être utilisé sous le contrôle permanent de l'opérateur.

AVERTISSEMENT: Utiliser uniquement des bouteilles de type E non magnétiques (en

aluminium) avec cet appareil. L'utilisation de bouteilles en acier dans la salle IRM pourrait occasionner des blessures graves ou mortelles.

AVERTISSEMENT: Ne pas utiliser de composants en provenance d'autres fabricants avec

l'appareil d'anesthésie, le ventilateur ou le circuit d'anesthésie, à moins qu'ils n'aient été approuvés au préalable. Contacter le service technique de Draeger Medical, Inc. pour des informations complémentaires.

Rev. A

1-4

Page 11

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NM MRI

INTRODUCTION (continued)

AVERTISSEMENT: Ne pas utiliser l'appareil d'anesthésie avec des anesthésiques

inflammables. Pour éviter tout risque d'explosion, ne pas utiliser d'anesthésiques inflammables tels que l'éther et le cyclopropane. Seuls les anesthésiques conformes aux exigences relatives aux anesthésiques ininflammables de la norme CEI ou toute norme nationale équivalente pourront être utilisés avec cet appareil.

AVERTISSEMENT: Lors du déplacement de l'appareil d'anesthésie, enlever tous les

moniteurs et autre matériel de l'étagère supérieure, retirer l'absorbeur et n'utiliser que les poignées ou les barres de poussée/ traction. L'appareil d'anesthésie ne doit être déplacé que par des personnes suffisamment fortes pour en supporter le poids. Draeger Medical, Inc. recommande que deux personnes déplacent l'appareil d'anesthésie afin de le manouvrer plus facilement. Veiller à ce que l'appareil ne bascule pas lors du déplacement sur des plans inclinés, dans des angles et au passage de seuils (portes et ascenseurs, par exemple). Ne pas faire passer l'appareil sur des tuyaux, des fils électriques ou d'autres obstacles se trouvant sur le sol.

ATTENTION: L'appareil d'anesthésie Narkomed MRI doit être utilisé uniquement en tant

que système pour l'imagerie à résonance magnétique. L'utilisateur ne doit pas présumer que chaque composant du système peut être utilisé seul pour l'IRM sans présenter de risques.

ATTENTION: Bien que l'appareil d'anesthésie Narkomed MRI soit conçu de manière à

minimiser le parasitage électromagnétique, son fonctionnement peut être affecté par l'utilisation de générateurs d'électrochirurgie ou d'appareils de diathermie à ondes courtes ou d'appareils à micro-ondes se trouvant aux alentours.

ATTENTION: Ne pas placer plus de 23 kg (50 livres) sur l'appareil.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-5

Page 12

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INTRODUCTION (continued)

Copyright © 2004 by Draeger Medical, Inc. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, or stored in a retrieval system in any form or by any means, electronic or mechanical, including photocopying and recording, without the written permission of Draeger Medical, Inc.

Trademark Notices

NM MRI

Datagrip, DrägerService, Narkomed, Narkomed GS, O.R. Data Manager, ORM, Quality Service For Life, Respitone,

trademarks of respective owners.

Disclaimer

The content of this manual is furnished for informational use only and is subject to change without notice. Draeger Medical, Inc. assumes no responsibility or liability for any errors or inaccuracies that may appear in this manual.

Draeger Medical, Inc. All other products or name brands are trademarks of their

Vigilance Audit, Vitalert, Vitalink, and Fabius GS are registered

1-6

Page 13

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NM MRI

DIAGNOSTICS

2.0 DIAGNOSTICS

The Narkomed MRI anesthesia system includes a volume, pressure, and oxygen monitor.

If your system is equipped with an Omicron (Core-M) monitor, refer to the

Monitor Instructions for Operation

(Part No. 4114448) for power-up diagnostic indications,

NAD Omicron

calibration, and setting of alarm parameters. Power to the monitor is supplied by the Narkomed MRI anesthesia system. A description of the power distribution scheme along with a troubleshooting guide is given in the next section.

The descriptions that follow apply to systems equipped with a VPO monitor.

2.1 Power-up Diagnostics

The VPO monitor contains a diagnostic system that monitors certain system functions and records their operational status. Following a brief System Startup display at power up, the diagnostics screen shown in Figure 2-1 appears. This display includes one of three messages at the completion of the diagnostics:

FUNCTIONAL: This message indicates that the Narkomed MRI has passed all

power-up tests and is fully functional. The machine will proceed to the MACHINE MONITOR screen after a short delay.

CONDITIONALLY This message indicates that a minor problem has been FUNCTIONAL: detected. The Narkomed MRI will retain this display until any key is

pressed, then the MACHINE MONITOR screen will be displayed.

NON-FUNCTIONAL: This message indicates that a serious problem has been detected. The

machine will not proceed into the MACHINE MONITOR or SYSTEM MONITOR screen.

The PREVENTIVE MAINTENANCE DUE message will appear on the screen if the current date exceeds the Periodic Manufacturer's Service due date stored in the machine.

Further diagnostic functions are available through service screens that can be called up at the display panel. The following paragraphs provide a description of each service screen that can be accessed at the display. If no display is present upon system powerup, refer to Section 3 of this manual for troubleshooting assistance.

Rev. E

2-1

Page 14

DIAGNOSTICS (continued)

DIAGNOSTIC TESTS

FIRMWARE PASS RAM PASS VIDEO PASS A/D CONVERTER PASS AUDIO PASS CLOCK PASS NON-VOLATILE MEMORY PASS

PERIODIC CERTIFICATION DUE FUNCTIONAL

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NM MRI

Figure 2-1. Power-up Diagnostics Screen

2-2

Rev. E

Page 15

NM MRI

2.2 Main Service Screen

2.2.1 View Mode

The Main Service Screen displays the machine serial number, the last service date, hours run since last service and total hours run.

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DIAGNOSTICS (continued)

SRVC

LOG

PMS

SCHED

To access the Main Service Screen, press and hold the Oxygen and Volume screen shown in Figure 2-2 will then appear.

Press the paragaph), or press the key next to screen.

MAIN SERVICE SCREEN

MACHINE SERIAL NUMBER : XXXXXXXX LAST SERVICE DATE : 2-29-2000 HOURS RUN SINCE LAST SERVICE: 263 TOTAL HOURS RUN : 624

Low Limit keys, and press the key. The View Mode service

key to proceed to the Service Mode (described in the next

EXIT to return to the monitoring

High Limit

Rev. E

MON

CAL

PORT

SERVICE CODE

Figure 2-2. Main Service Screen, View Mode

VIEW

2-3

SELECT

EXIT

Page 16

DIAGNOSTICS (continued)

2.2.2 Service Mode

In this screen, the Service Code Changes to SRVC.

Press the key next to SELECT to enable the Technical Service ID entry as described on the next page.

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NM MRI

SRVC

LOG

PMS

SCHED

MON

CAL

PORT

Figure 2-3. Main Service Screen, Service Mode

MAIN SERVICE SCREEN

MACHINE SERIAL NUMBER : XXXXXXXX LAST SERVICE DATE : 2-29-2000 HOURS RUN SINCE LAST SERVICE: 263 TOTAL HOURS RUN : 624

SERVICE CODE

SRVC

SELECT

EXIT

2-4

Rev. E

Page 17

NM MRI

2.2.3 Service Mode: I.D. Entry

The Service Mode screen appears as shown in Figure 2-4. Press the key next to and keys to display the desired character. Press the key next to

SELECT to advance to the next digit, and enter the next and remaining

I.D. characters in the same manner.

When this screen is entered, an entry is made in the Service Log.

To access any of the other service screens described on the following pages, press the key next to the desired function on the left side of the screen: Service Log, PMS Schedule, Monitor Calibration, or Port communication settings.

SELECT. Enter the first digit of your service code by using the

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DIAGNOSTICS (continued)

RESET

SRVC

LOG

PMS

SCHED

MON CAL

PORT

Pressing the key next to LAST SERVICE to zero, and the LAST SERVICE DATE to the current date.

If desired, press the key next to

MAIN SERVICE SCREEN

MACHINE SERIAL NUMBER : XXXXXXXX LAST SERVICE DATE : 2-29-2000 HOURS RUN SINCE LAST SERVICE: 263 TOTAL HOURS RUN : 624

TECHNICAL SERVICE

REPRESENTATIVE I.D.

0 0 0

RESET will reset the HOURS RUN SINCE

EXIT to return to the monitoring screen.

SELECT

EXIT

Rev. E

Figure 2-4. Main Service Screen, Service Mode

2-5

Page 18

DIAGNOSTICS (continued)

2.3 Service Log

From the Service Screen (described earlier), press the key next to SRVC LOG.

Figure 2-5 shows an example of the screen that will appear. This screen allows you to view the events recorded in the machine's service log. Use the and keys to scroll down or up through the log entries.

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NM MRI

Press the key next to

EXIT to return to the Main Service Screen.

SERVICE LOG

DATE TIME PARAMETER CODE

02-11-00 10:26 00000000 0000 SYSTEM POWERUP 02-11-00 10:30 00000000 E400 AUDIOGEN SPKR CHK 02-13-00 07:30 00000004 E100

Figure 2-5. Service Log

2-6

EXIT

Rev. E

Page 19

NM MRI

2.4 PMS Criteria Screen

The PMS Criteria Screen allows you to select the month when the PREVENTIVE MAINTENANCE DUE message appears on the power-up diagnostics screen.

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DIAGNOSTICS (continued)

From the Service Screen (described earlier), press the hidden key next to

SCHED

Figure 2-6 shows an example of the screen that will appear. Use the and keys to set the desired month.

Press the key next to

SELECT CRITERIA FOR “PREVENTIVE MAINTENANCE” MESSAGE

EXIT to return to the Main Service Screen.

PMS

Rev. E

MONTH

SEP

2000

Figure 2-6. PMS Criteria Screen

EXIT

2-7

Page 20

DIAGNOSTICS (continued)

2.5 Oxygen Monitor Service Screen

The Oxygen Monitor Service Screen shown in Figure 2-7 displays current readings for the O values.

cells, a zero calibration procedure, and the stored calibration

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NM MRI

From the Service Screen (described earlier), press the key next to

To perform a zero calibration, follow the calibration procedure shown on the screen. Pressing the key next to calibration.

To proceed to the Pressure Monitor Service Screen, press the key next to

. To return to the Main Service Screen, press the key next to EXIT.

MON

ZERO stores the current values as the new zero

MON CAL.

OXYGEN MONITOR SERVICE SCREEN

CURRENT CELL A: 238 CURRENT CELL B: 250

ZERO

PRES

ZERO CALIBRATION PROCEDURE:

- REMOVE O2 CELL FROM HOUSING

- LET CURRENT CELL VALUES STABILIZE

- PRESS “ZERO” KEY TO ENTER CALIBRATION VALUES

- REINSTALL O2 CELL IN SENSOR HOUSING

STORED ZERO CELL A: 250 STORED ZERO CELL B: 250

Figure 2-7. Oxygen Monitor Service Screen

2-8

PRES

MON

EXIT

Rev. E

Page 21

NM MRI

2.6 Pressure Monitor Service Screen

The Pressure Monitor Service Screen shown in Figure 2-8 displays the current reading for airway pressure, a procedure for zero and span calibration, and the stored calibration values.

To enter the Pressure Monitor Service Screen from the Oxygen Monitor Service Screen (described earlier), press the key next to

To perform a zero calibration, follow the procedure shown on the screen. Pressing the key next to calibration.

To perform a span calibration, follow the procedure shown on the screen. Pressing the key next to calibration.

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DIAGNOSTICS (continued)

PRES MON (ref. Figure 2-6).

ZERO stores the current value as the new zero

SPAN stores the current value as the new span

To return to the Oxygen Monitor Service Screen, press the key next to

. To return to the Main Service Screen, press the key next to EXIT.

MON

PRESSURE MONITOR SERVICE SCREEN

CURRENT PRESSURE VALUE: 250

ZERO CALIBRATION PROCEDURE:

- REMOVE PRESSURE SAMPLE LINE FROM ABSORBER, EXPOSE TO AIR.

- LET CURRENT PRESSURE VALUE STABILIZE

- SELECT “ZERO” KEY TO ENTER CALIBRATION VALUES.

SPAN CALIBRATION PROCEDURE:

- REMOVE PRESSURE SAMPLE LINE FROM ABSORBER, APPLY 50 CMH2O CONSTANT PRESSURE AT THE SAMPLE LINE, VERIFIED BY A KNOWN, CALIBRATED METER.

- LET PRESSURE VALUE STABILIZE

- SELECT THE “SPAN” KEY TO ENTER THE CURRENT VALUE.

ZERO

SPAN

OXY

MON

EXIT

OXY

Rev. E

Figure 2-8. Pressure Monitor Service Screen

2-9

Page 22

DIAGNOSTICS (continued)

2.7 Deleted

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2-10

Rev. L

Page 23

NM MRI

3.0 TROUBLESHOOTING

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TROUBLESHOOTING GUIDE

This section contains information to assist the DrägerService

qualified Technical

Service Representative (TSR) in locating electrical faults affecting the Narkomed MRI anesthesia system. Since most troubleshooting efforts begin with verifying power supply voltages, the following paragraph outlines the voltage distribution scheme within the machine along with test points for each of the voltages.

3.1 Power Supply and Voltage Distribution

Power is distributed from the battery box PCB assembly to the alarm channel, monitor, and flow sensor electronics module on machines with a VPO monitor. Power for the ventilator controller is obtained from the alarm channel. Table 3-1 lists the test points and acceptable ranges for each voltage; Figures 3-1 and 3-2 show test point locations. Simplified electrical block diagrams are shown in Figures 3-3 and 3-4.

TABLE 3-1: TEST POINTS AND ALLOWABLE RANGES

BATTERY BOX PCB

VOLTAGE ACCEPTABLE RANGE

(Machines with Core-M monitor)

J1-1 + 13.8 VDC input* 13.6 to 14.0 VDC

J4-1 + 9 VDC to monitor 8.45 to 9.55 VDC

J3-1 + 8 VDC to alarm channel 7.55 to 8.45 VDC

J1-2, J4-2, J3-14 Common

BATTERY BOX PCB

VOLTAGE ACCEPTABLE RANGE

(Machines with VPO monitor)

J7-1 + 8 VDC to monitor 7.72 to 8.36 VDC

J4-1 + 12 VDC to Gill flow sensor 11.61 to 12.54 VDC

J7-2, J4-2 Common

ALARM CHANNEL VOLTAGE ACCEPTABLE RANGE

J3-9 (Wht) + 8 VDC to vent controller 7.55 to 8.45 VDC

J3-3 (Orn) Common

* Applies to early models, measured with battery fully charged and System Power switch at

STANDBY.

On later models with Jerome power supply including machines with VPO monitor, input voltage is measured at DC power cable Pins 1& 2, with cable unplugged. Range: 13.6 to 14.5 VDC.

Rev. L

3-1

Page 24

TROUBLESHOOTING GUIDE (continued)

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NM MRI

J1 FROM BATTERY CHARGER

J2 FROM BATTERY

FI BATTERY FUSE (TYPE 3AG, FAST, 10A, 250V, 312 010)

F3 8V SUPPLY FUSE

(TYPE 3AG, SLO-BLO,

1A, 250V, 313 001)

SV00034

J3 TO

ALARM

CHANNEL

J4 TO

CORE-M

MONITOR

CONNECTION FOR FIBER OPTIC CABLE

ALARM CHANNEL CONNECTOR J3

(TYPE 3AG, FAST, 0.75A, 250V, 312.750)

987

654

321

F2 9V SUPPLY FUSE

FIGURE 3-1. Power Supply Voltage Test Points: Machines with Core-M Monitor

3-2

Rev. E

Page 25

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NM MRI

F1 BATTERY FUSE, 10A, 3AG FAST J2 FROM

J1 POWER IN

J7 TO NAD MONITOR

TROUBLESHOOTING GUIDE (continued)

BATTERY

FLOW SENSOR

POWER FUSE

0.5A, 3AG, FAST

F2 8V

SUPPLY FUSE

1A, 3AG,

SLO-BLO

RX1 FIBER OPTIC CABLE FROM VENT CONTROLLER

F3 MONITOR POWER FUSE 3A, 3AG, FAST

ALARM CHANNEL CONNECTOR J3

987

654

321

J4 FLOW SENSOR MODULE J1

J5 FLOW SENSOR MODULE J2

J8 HIGH FIELD SIGNAL TO MONITOR

J6 TO VENTILATOR SOLENOID

FIGURE 3-2. Power Supply Voltage Test Points: Machines with VPO Monitor

SV00181

J3 TO ALARM

CHANNEL

Rev. E

3-3

Page 26

TROUBLESHOOTING GUIDE (continued)

FLOWMETER

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NM MRI

LIGHTS

FEED THRU

FILTERS

9V POWER

FOR

MONITOR

BATTERY

BOX PCB

ALARM

CHANNEL

30 PSI

RX1

BATTERY

VENTILATOR

CONTROLLER

FIBER OPTIC

INTERFACE

TX1

VENT

SOLENOID

FIBER OPTIC CABLE

FILTER

BOX

MAINS

POWER SUPPLY

FIGURE 3-3. Narkomed MRI Block Diagram: Machines w/Core-M Monitor

3-4

Rev. E

Page 27

NM MRI

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TROUBLESHOOTING GUIDE (continued)

FLOWMETER

LIGHTS

FEED

THRU

FILTERS

NAD MONITOR

FLOW SENSOR MODULE

BATTERY

BOX PCB

ALARM

CHANNEL

30 PSI

RX1

BATTERY

VENTILATOR

CONTROLLER

FIBER OPTIC

INTERFACE

TX1

VENT

SOLENOID

FIBER OPTIC

CABLE

FILTER

BOX

MAINS

POWER SUPPLY

FIGURE 3-4. Narkomed MRI Block Diagram: Machines w/VPO Monitor

Rev. F

3-5

Page 28

TROUBLESHOOTING GUIDE (continued)

3.2 Battery

With the System Power switch at STANDBY and the power supply/charger box disconnected, the battery voltage at full charge should be within the range of 12.5 to 13.2 VDC. Battery voltage can be measured at J2 on the battery box PCB. During battery operation, the low battery cutoff voltage should be within the range of 10.7 to 11.3 VDC.

3.3 Troubleshooting Guides

Table 3-2 lists common failure modes and symptoms (excluding simultaneous multiple faults) for the Narkomed MRI. Each failure mode or symptom is keyed to a troubleshooting guide flow chart at the back of this section to assist the TSR in locating a problem. These flow charts assume that the machine is plugged into an AC outlet with the correct voltage, and the machine is not running on its backup battery.

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NM MRI

TABLE 3-2: NARKOMED MRI FAILURE MODE AND SYMPTOM LIST

FAILURE MODE / SYMPTOM CORRECTIVE ACTION

Monitor Inoperative (Core-M Monitor) Guide 1

No O

Supply Pressure Alarm Guide 2

Ventilator Inoperative Guide 3

No Audio Alarms, Display Blank,

Guide 4

Keypad Inoperative (VPO Monitor)

Serial Port Communication Failure

Guide 5

(VPO Monitor)

Loss of Breathing Pressure Monitor

Guide 6

(VPO Monitor)

Loss of Respiratory Volume Monitor

Guide 7

(VPO Monitor)

3-6

Rev. E

Page 29

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NM MRI

GUIDE 1: Monitor Inoperative (Core-M Monitor)

START

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TROUBLESHOOTING GUIDE (continued)

CONNECT

POWER CORD

ARE

ALL MONITOR

FUNCTIONS

WORKING?

IS POWER CORD CONNECTED?

IS POWER

AVAILABLE AT

CONNECTOR?

ARE

ALL MONITOR

FUNCTIONS

WORKING?

CHECK: POWER TO BATTERY BOX PCB

..................................

REPLACE BATTERY BOX

PCB ASSEMBLY

POWER

AVAILABLE AT

BATTERY BOX

PCB?

CHECK INTERNAL

CABLE TO POWER

CONNECTOR

ARE

ALL MONITOR

FUNCTIONS

WORKING?

REINSTALL ORIGINAL

BATTERY BOX PCB

CONTACT NAD

SERVICE DEPT.

PERFORM A

COMPLETE PMS

ON THE UNIT

DOES

UNIT PASS

PMS?

Rev. E

CHECK:

-SENSOR INTERFACE CONNECTIONS

-SENSOR ELEMENTS:

REFER TO

MANUFACTURER’S

OPERATOR’S MANUAL

ARE

ALL MONITOR

FUNCTIONS

WORKING?

3-7

UNIT IS

FUNCTIONAL

Page 30

TROUBLESHOOTING GUIDE (continued)

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NM MRI

START

O2 SUPPLY

PRESSURE ALARM

FUNCTIONAL?

CHECK:

-O2 PRESSURE SWITCH

-CABLE FROM BATTERY BOX PCB TO ALARM CHANNEL

-SUPPLY VOLTAGE TO ALARM CHANNEL

O2 SUPPLY

PRESSURE ALARM

FUNCTIONAL?

GUIDE 2: No O

PERFORM A

COMPLETE PMS

ON THE UNIT

DOES

UNIT PASS

PMS?

Supply Pressure Alarm

UNIT IS

FUNCTIONAL

REPLACE

ALARM CHANNEL

O2 SUPPLY

PRESSURE ALARM

FUNCTIONAL?

REINSTALL ORIGINAL

ALARM CHANNEL

..................................

REPLACE BATTERY

BOX PCB ASSEMBLY

CONTACT NAD

SERVICE DEPT.

REINSTALL ORIGINAL

BATTERY BOX

PCB ASSEMBLY

O2 SUPPLY

PRESSURE ALARM

FUNCTIONAL?

3-8

Rev. E

Page 31

NM MRI

GUIDE 3: Ventilator Inoperative

START

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TROUBLESHOOTING GUIDE (continued)

IS VENTILATOR

WORKING

PROPERLY?

VERIFY CORRECT SETTINGS:

VENTILATOR SWITCH ON,

INSP. FLOW, FREQUENCY,

I:E RATIO, TIDAL VOLUME

PRESS. LIMIT CONTROL

CHECK CYLINDER AND

PIPELINE SUPPLIES FOR

ADEQUATE O2 PRESSURE

VERIFY CORRECT BREATHING

HOSE AND SCAVENGER

HOSE CONNECTIONS TO

BELLOWS ASSEMBLY

CHECK REMOTE SOLENOID,

REPLACE IF DEFECTIVE

IS VENTILATOR

WORKING

PROPERLY?

CHECK CABLES AND TUBING

CONNECTIONS AT

VENTILATOR

CONTROLLER, REPLACE

CONTROLLER ASSEMBLY

REINSTALL ORIGINAL

VENTILATOR CONTROLLER

.........................................

REPLACE VALVE AND

GUIDE ASSEMBLY

IS VENTILATOR

WORKING

PROPERLY?

IS VENTILATOR

WORKING

PROPERLY?

IS 8V

POWER PRESENT

AT FEED THRU FILTERS

ON VENTILATOR

CONTROLLER?

CHECK WIRE HARNESS FROM

ALARM CHANNEL J3, CABLE

FROM BATTERY BOX PCB

ASSEMBLY J3 TO ALARM

CHANNEL J4, FIBER OPTIC

CABLE FROM CONTROLLER

TX1 TO RX1 IN BATTERY BOX,

CABLE FROM BATTERY BOX

J6 TO VENT SOLENOID;

REPLACE BATTERY BOX PCB

ASSEMBLY IF DEFECTIVE

IS VENTILATOR

WORKING

PROPERLY?

REINSTALL ORIGINAL

GUIDE ASSEMBLY

VALVE AND

COMPLETE PMS

PERFORM A

ON UNIT

DOES UNIT

PASS PMS?

UNIT IS

FUNCTIONAL

IS VENTILATOR

WORKING

PROPERLY?

CONTACT NAD

SERVICE DEPT.

Rev. E

3-9

Page 32

TROUBLESHOOTING GUIDE (continued)

Guide 4: No Audio Alarms, Display Blank, Keypad Inoperative (VPO Monitor)

START

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NM MRI

AUDIO

ALARMS

FAIL?

CHECK POWER & DATA CABLES FROM SOURCE TO MONITOR CHECK POWER SUPPLY VOLTAGE

----------------------------------------REPLACE POWER SUPPLY PCB OR PRIMARY POWER SUPPLY IF APPLICABLE

ARE

MONITOR FUNCTIONS

WORKING

CORRECTLY?

DISPLAY

BLANK

PERFORM A

COMPLETE PMS

ON UNIT

KEYPAD

INOPERATIVE

DOES

UNIT PASS

PMS?

UNIT IS

FUNCTIONAL

REPLACE NAD MONITOR AS OUTLINED IN SECTION 4

ARE

MONITOR FUNCTIONS

WORKING

CORRECTLY?

3-10

REINSTALL ORIGINAL MONITOR

CONTACT NAD

SERVICE DEPT.

Rev. E

Page 33

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NM MRI

TROUBLESHOOTING GUIDE (continued)

Guide 5: Serial Port Communication Failure (VPO Monitor)

START

CONNECT

PERIPHERAL CABLE

TO SERIAL INTERFACE

PORT

PORT COMMUNICATION

CHECK PERIPHERAL

PORT CONFIGURATION

PORT COMMUNICATION

CABLE CONNECTED TO

SERIAL INTERFACE

SERIAL

FAILURE?

AND HOST SERIAL

SETTINGS

SERIAL

FAILURE?

PERIPHERAL

PORT?

Rev. E

SUBSTITUTE

ANOTHER CABLE

SERIAL

PORT COMMUNICATION

FAILURE?

REPLACE NAD MONITOR

AS OUTLINED IN

SECTION 4

REPLACE

CABLE

PERFORM A

COMPLETE PMS

ON UNIT

DOES

UNIT PASS

PMS?

UNIT IS

FUNCTIONAL

SERIAL

PORT COMMUNICATION

FAILURE?

REINSTALL ORIGINAL

NAD MONITOR

CONTACT NAD

SERVICE DEPT.

3-11

Page 34

TROUBLESHOOTING GUIDE (continued)

Guide 6: Loss of Breathing Pressure Monitor (VPO Monitor)

START

BREATHING

PRESSURE

MONITOR WORKING

PROPERLY?

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NM MRI

CHECK PILOT LINE CONNECTION AT BOTH ENDS

PILOT LINE

CONNECTED?

PERFORM THE PRESSURE MONITOR CALIBRATION GIVEN IN SECTION 5

BREATHING

PRESSURE

MONITOR WORKING

PROPERLY?

REPLACE NAD

MONITOR AS OUTLINED

IN SECTION 4

BREATHING

PRESSURE

MONITOR WORKING

PROPERLY?

PERFORM A

COMPLETE PMS

ON THE UNIT

UNIT IS

FUNCTIONAL

DOES

UNIT PASS

PMS?

3-12

REINSTALL ORIGINAL

NAD MONITOR

CONTACT NAD

SERVICE DEPT.

Rev. E

Page 35

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NM MRI

TROUBLESHOOTING GUIDE (continued)

Guide 7: Loss of Respiratory Volume Monitor (VPO Monitor)

START

RESPIRATORY

VOLUME MONITOR

WORKING

PROPERLY

CHECK HOSE CONNECTIONS, VALVE MOUNTING & GASKETS

SENSOR INSTALLED

CHECK FLOW SENSOR ELEMENTS & O-RINGS

VOLUME MONITOR

IS FLOW

CORRECTLY?

RESPIRATORY

WORKING

PROPERLY

REINSTALL ORIGINAL

NAD MONITOR

RESPIRATORY

VOLUME MONITOR

WORKING

PROPERLY

REINSTALL ORIGINAL FLOW SENSOR ASM

------------------------------REPLACE NAD MONITOR AS OUTLINED IN SECTION 4

CONTACT NAD

SERVICE DEPT.

DOES

UNIT PASS

PMS?

UNIT IS

FUNCTIONAL

Rev. E

CHECK POWER TO FLOW SENSOR ELECTRONICS MODULE, DATA CABLE FROM MODULE TO MONITOR

RESPIRATORY

VOLUME MONITOR

WORKING

PROPERLY

VOLUME MONITOR

REPLACE COMPLETE

FLOW SENSOR ASM AS OUTLINED IN SECTION 4

RESPIRATORY

WORKING

PROPERLY

3-13

COMPLETE PMS

PERFORM A

ON THE UNIT

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Page 37

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NM MRI

REPLACEMENT PROCEDURES

4.0 REPLACEMENT PROCEDURES

This section outlines removal and replacement procedures for the field-replaceable assemblies of the Narkomed MRI Anesthesia System.

These procedures are to be performed only by a Draeger Medical, Inc. qualified Technical Service Representative (TSR).

The following are the only procedures authorized by Draeger Medical, Inc. to be performed in the field. All other service procedures shall be referred to Draeger Medical, Inc.'s Technical Service Department.

NOTE: The PMS PROCEDURE given in Section 6 must be performed after

any replacement, removal, calibration or adjustment procedure.

WARNING: Do not place any object on this machine unless it is specifically labeled to

be used in an MRI scanning room and on the Narkomed MRI anesthesia system. Objects placed on this machine that are not designed for use with this anesthesia system may be strongly attracted to the magnet and may cause serious injury or death when the machine is used in an MRI scanning room.

WARNING: Always lock the casters after this anesthesia machine has been positioned

in the MRI scanner room. Magnetic attractive forces between the magnet and the anesthesia machine may cause unintentional movement of the anesthesia machine if the casters are unlocked.

WARNING: The power supply charger assembly must not be taken into the magnet

room. Damage to the equipment, MRI system, or personal injury could result.

WARNING: The anesthesia machine must be removed from the MRI scanner room

before servicing the machine. Do not enter the MRI scanner room with any tools or instruments. These items may be strongly attracted to the magnet and may cause serious injury or death when brought into an MRI scanning room.

Rev. B

4-1

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REPLACEMENT PROCEDURES (continued)

4.1 Cylinder Yoke Assemblies

Each cylinder yoke contains a replaceable filter and check valve assembly. Figure 4-1 shows a typical cylinder yoke mounting arrangement. Access to the yoke mounting screws and gas line connection requires that the table top and the table bottom cover be removed from the machine.

4.1.1 Disconnect all pipeline hoses and turn the System Power switch to ON.

NM MRI

4.1.2 Close all cylinder valves except the O

valve.

4.1.3 Set the oxygen flow to 5 liters per min.

4.1.4 Open the other gas flow control valves to drain pressure from the system.

4.1.5 Close the O

cylinder valve, and close the flow control valves. Press the O2

Flush valve to drain oxygen pressure from the system.

4.1.6 Turn the System Power switch to

STANDBY.

4.1.7 Remove the cylinder where the yoke is to be replaced. Store the cylinder in a safe place and lay it on its side.

4.1.8 Loosen the screws holding the table top to the machine and lift out the table top.

4.1.9 Remove the screws securing the table bottom cover to the machine frame, and remove the bottom cover. (These screws are accessible after the table top is removed.)

4.1.10 Disconnect the gas line fitting at the yoke and remove the two yoke mounting screws.

4.1.11 Remove the filter and check valve assembly from the yoke and install a replacement assembly.

NOTE: If the entire yoke assembly is being replaced, verify that the pin indexing

arrangement and the label are in agreement with the gas designation stamped on the mounting surface of the yoke. Refer to the parts list section for parts identification.

4-2

Page 39

NM MRI

REAR FRAME RAIL

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REPLACEMENT PROCEDURES (continued)

YOKE ASSEMBLY

(TYPICAL)

GAS LINE

FILTER AND

CHECK VALVE

ASSEMBLY

SV00096

FIGURE 4-1. Cylinder Yoke Assembly

4-3

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REPLACEMENT PROCEDURES (continued)

4.1.12 Position the yoke on the spacer, and install the two mounting screws and lockwashers. Tighten the screws securely. Connect the gas line fitting to the yoke.

4.1.13 If a new cylinder is being installed, remove the old sealing washer from the gas inlet of the yoke and install a new washer.

4.1.14 Install the correct cylinder in the yoke, making sure that the index pins are properly engaged before tightening the handle bolt. The cylinder should hang vertically after the handle is tight.

4.1.15 Perform the following leak test on the yoke assembly:

4.1.15.1 Open the cylinder valve and check for a pressure indication on the corresponding gauge at the gas instrumentation panel.

NOTE: The cylinder used for this test must contain the following minimum pressure:

NM MRI

: 1000 Psi

O: 700 Psi

4.1.15.2 Close the cylinder valve and remove the cylinder from the yoke.

4.1.15.3 For any gas, the pressure should not drop more than 50 Psi in two minutes.

4.1.16 Reinstall the cylinder in the yoke.

4.1.17 Reinstall the table bottom cover.

4.1.18 Reinstall the table top and tighten its retaining screws.

4.1.19 Reconnect the pipeline hoses.

4.1.20 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.1.21 Perform the PMS Procedure given in Section 6.

4-4

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NM MRI

REPLACEMENT PROCEDURES (continued)

4.2 Cylinder Pressure Regulators

Access to the cylinder pressure regulators requires removal of the table top and the table bottom cover from the anesthesia machine. Figure 4-2 shows the mounting arrangement of the regulators and typical connections.

4.2.1 Disconnect all pipeline hoses and turn the System Power switch to ON.

4.2.2 Close all cylinder valves except the O

valve.

4.2.3 Set the oxygen flow to 5 liters per min.

4.2.4 Open the other gas flow control valves to drain pressure from the system.

4.2.5 Close the O

cylinder valve, and close the flow control valves. Press the O2

Flush valve to drain oxygen pressure from the system.

4.2.6 Turn the System Power switch to

STANDBY.

4.2.7 Remove the cylinder corresponding to the regulator to be replaced.

4.2.8 Loosen the screws holding the table top to the machine and lift out the table top.

4.2.9 Remove the screws securing the table bottom cover to the machine frame, and remove the bottom cover. (These screws are accessible after the table top is removed.)

4.2.10 Disconnect the compression fittings at the regulator.

4.2.11 Loosen the two setscrews holding the regulator to its mounting bracket and remove the regulator.

4.2.12 Record the serial number of the regulator that was removed, and record the serial number of the replacement regulator.

NOTE: If fittings must be installed in the replacement regulator, use Loctite #271

(red). Refer to the parts list section for parts identification.

4.2.13 Position the replacement regulator in its mounting bracket, and connect the three compression fittings. Do not tighten the fittings yet.

4-5

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REPLACEMENT PROCEDURES (continued)

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NM MRI

N2O CYLINDER PRESSURE REGULATOR

SET SCREW (2X PER REGULATOR)

SV00069

O2 CYLINDER PRESSURE REGULATOR

ACORN NUT

FIGURE 4-2. Cylinder Pressure Regulators

O2 TEST

CONNECTION

N2O TEST

CONNECTION

SIDE VIEW OF REGULATOR (TYP.)

ADJUSTMENT SCREW

4-6

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NM MRI

REPLACEMENT PROCEDURES (continued)

4.2.14 Tighten the regulator mounting setscrews to a torque of 50 to 55 in. lbs.

4.2.15 Tighten the compression fittings.

4.2.16 Locate the TEE fitting in the ¼ in. diameter regulator output line, and remove the plug from the TEE fitting.

4.2.17 Set the regulator output pressure in accordance with the Cylinder Pressure Regulator Adjustment given in Section 5.

4.2.18 Perform the following leak test on the high pressure side of the regulator:

4.2.18.1 Open the cylinder valve and check for a pressure indication on the corresponding gauge at the gas instrumentation panel.

NOTE: The cylinder used for this test must contain the following minimum pressure:

: 1000 Psi

O: 700 Psi

4.2.18.2 Close the cylinder valve and remove the cylinder from the yoke.

4.2.18.3 For any gas, the pressure should not drop more than 50 Psi in two minutes.

4.2.19 Reinstall the cylinder in the yoke.

4.2.20 Reinstall the table bottom cover.

4.2.21 Reinstall the table top and tighten its retaining screws.

4.2.22 Reconnect the pipeline hoses.

4.2.23 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.2.24 Perform the PMS Procedure given in Section 6.

4-7

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REPLACEMENT PROCEDURES (continued)

NM MRI

4.3 Cylinder Cutoff Valves (Canada)

Access to the cylinder cutoff valves requires removal of the table top and the table bottom cover from the anesthesia machine. Figure 4-3 shows the locations of the cutoff valve assemblies. The instructions apply to all assemblies.

NOTE: Replacement of the O

Cutoff Valve Assembly shall be performed every 24

months. Documentation shall be created by the service person and a copy distributed to the owner institution. Testing of the O

Cutoff Valve shall be performed at each

PMS. (Perform the flow test given at the end of the following procedure)

4.3.1 Disconnect all pipeline hoses and set the System Power switch to ON.

4.3.2 Close all cylinder valves except the O

valve.

4.3.3 Set the oxygen flow to 5 liters per min.

4.3.4 Open the other gas flow control valves to drain pressure from the system.

4.3.5 Close the O

cylinder valve, and close the flow control valves. Press the O2

Flush valve to drain oxygen pressure from the system.

4.3.6 Set the System Power switch to

STANDBY.

4.3.7 Loosen the screws holding the table top to the machine and lift out the table top.

4.3.8 Remove the screws securing the table bottom cover to the machine frame, and remove the bottom cover. (These screws are accessible after the table top is removed.)

4.3.9 Disconnect the compression fittings indicated at points marked

C on the

illustration.

4.3.10 Disconnect the flexible tubing from the cutoff valve assembly at the point marked

A on the illustration.

4.3.11 Remove the cylinder cutoff assembly.

4.3.12 Connect the flexible tubing to the replacement cutoff valve assembly and secure it with the hose clamp.

4.3.13 Connect and tighten the compression fittings at points marked

C on the

illustration.

4-8

Page 45

NM MRI

SV00062

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REPLACEMENT PROCEDURES (continued)

O2 CYLINDER

CUTOFF VALVE

ASSEMBLY

FIGURE 4-3. Cylinder Cutoff Valves (Canada)

4-9

N2O CYLINDER

CUTOFF VALVE

ASSEMBLY

Page 46

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REPLACEMENT PROCEDURES (continued)

4.3.14 Perform the following test: --Remove the plug from the test gauge connection at the Tee fitting in the regulator outlet piping, and install a test gauge.

NOTE:The cylinders used for this test must contain the following minimum pressure: O

: 1000 PSI N2O: 745 PSI

--Set the System Power switch to ON.

--For the O

cutoff valve: open the O2 cylinder valve and set the oxygen flow

to 4 liters per min.

--For the N

O cutoff valve: open the O2 cylinder valve and the N2O cylinder

valve. Set each flow to 4 liters per min.

--Verify that regulator outlet pressure is between 43 and 49 PSI.

--Connect the pipeline hoses and pressurize to 50 PSI.

--Turn off the pipeline supply and observe the pipeline pressure gauge.

--The cutoff valve shall open when the pipeline pressure drops through the

range of 45 to 40 PSI.

--Close the cylinder valve(s), and close the flow control valve(s).

--Disconnect test pressure gauge and reinstall the plug in the regulator

outlet piping.

NM MRI

4.3.15 Reinstall the table bottom cover.

4.3.16 Reinstall the table top and tighten its retaining screws.

4.3.17 Connect the pipeline hoses.

4.3.18 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.3.19 Perform the PMS Procedure given in Section 6.

O2 Flow Test:

--Disconnect all pipeline supplies.

--Install a full O

cylinder on the machine, and open the cylinder valve.

--Turn the System Power switch to ON.

--Set the Inspiratory Flow control to maximum high, and turn the ventilator

switch to ON.

--Set the oxygen flow to 10 l/min.

--Verify that the oxygen flow does not drop below 8 l/min. while the

ventilator is running.

--Press and hold the O

FLUSH button while observing the O2 flowmeter,

and verify that the oxygen flow does not drop below 8 l/min.

--If the oxygen flow in either of the above two steps drops below 8 l/min.,

replace the O

cutoff valve assembly.

4-10

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NM MRI

REPLACEMENT PROCEDURES (continued)

4.4 Cylinder and Pipeline Pressure Gauges

Replacement of the cylinder and pipeline pressure gauges requires that the plexiglass front flowmeter cover be removed, and also the flowmeter housing rear cover for access to the gauge connections. Figure 4-4 shows gauge mounting and connection details.

NOTE: The gauges used in the Narkomed MRI are non-magnetic and are not

interchangeable with gauges from the other Narkomeds.

4.4.1 Disconnect all pipeline hoses and set the System Power switch to ON.

4.4.2 Close all cylinder valves except the O

valve.

4.4.3 Set the oxygen flow to 5 liters per min.

4.4.4 Open the other gas flow control valves to drain pressure from the system.

4.4.5 Close the O

cylinder valve, and close the flow control valves. Press the O2

Flush valve to drain oxygen pressure from the system.

4.4.6 Set the System Power switch to

STANDBY.

4.4.7 Remove the screws holding the rear cover, and remove the cover.

4.4.8 Loosen the screws holding the table top to the machine and lift out the table top.

4.4.9 Remove the screws holding the angled plate at the top of the flowmeter shield, and remove the plate.

4.4.10 Remove the oxygen flow control knob. The knob has two setscrews.

NOTE: If the knob must be rotated to allow access to a setscrew, carefully note its

position so that it can be re-assembled in the same position with the "Off Stop" properly set.

4.4.11 Remove the two screws holding the knob guard in place, and remove the knob guard.

4.4.12 Carefully remove the plexiglass cover from the front of the flowmeter housing.

4-11

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REPLACEMENT PROCEDURES (continued)

REAR VIEW OF

FLOWMETER HOUSING

WITH REAR COVER REMOVED

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NM MRI

FLEXIBLE TUBING CONNECTION (PIPELINE PRESSURE GAUGES)

COMPRESSION FITTING (CYLINDER PRESSURE GAUGES)

GAUGE

MOUNTING

NUTS (TYPICAL)

SV00086

FIGURE 4-4. Cylinder and Pipeline Pressure Gauges

4-12

Page 49

NM MRI

NOTE: Intermediate assemblies may need to be removed to allow access to the gauge connections and mounting hardware. Be sure to keep a record of the disassembly sequence so that all tubing can be correctly re-assembled.

4.4.13 A: For the cylinder pressure gauges:

Disconnect the compression fitting at the back of the gauge.

Remove the gauge mounting nuts, and remove the gauge from the front of the panel.

Install the replacement gauge in the panel using the flat washers, lock washers and mounting nuts that were previously removed.

Connect the gas line to the gauge and tighten the compression fitting.

4.3.13 B: For the pipeline pressure gauges:

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REPLACEMENT PROCEDURES (continued)

Locate the flexible tubing connecting the gauge to the pipeline inlet assembly and disconnect the tubing.

Remove the gauge mounting nuts, and remove the gauge from the front of the panel.

Disconnect the flexible tubing from the gauge.

Connect a new length of tubing to the replacement gauge and secure it with a hose clamp.

Place the gauge in the panel and secure it with the flat washers, lock washers and mounting nuts that were previously removed.

Place a hose clamp on the other end of the flexible tubing; connect the tubing to the pipeline inlet assembly and secure it with the hose clamp.

4.4.14 If a cylinder pressure gauge was replaced, perform the following leak test:

4-13

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REPLACEMENT PROCEDURES (continued)

4.4.14.1 Open the cylinder valve and check for a pressure indication on the corresponding gauge at the gas instrumentation panel.

NOTE: The cylinder used for this test must contain the following minimum pressure:

: 1000 Psi

O: 700 Psi

4.4.14.2 Close the cylinder valve and remove the cylinder from the yoke.

4.4.14.3 For any gas, the pressure should not drop more than 50 Psi in two minutes.

4.4.15 Re-install the cylinder in the yoke.

4.4.16 Place the plexiglass cover over the gauges and flow tubes, and ensure that the cover is fitted properly over the flow control valves.

NM MRI

4.4.17 Place the knob guard over the flow control valves and install its two retaining screws.

4.4.18 Install the oxygen flow control knob and tighten its setscrews. If the knobs are installed properly, their labels will be straight when the knobs are against their clockwise stops.

4.4.19 Replace the angled plate at the top of the plexiglass cover and secure it with the hardware that was previously removed.

4.4.20 Replace the rear cover and its retaining screws.

4.4.21 Reinstall the table top and tighten its retaining screws.

4.4.22 Connect the pipeline hoses.

4.4.23 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.4.24 Perform the PMS Procedure given in Section 6.

4-14

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NM MRI

REPLACEMENT PROCEDURES (continued)

4.5 Flowmeters

The flowmeter tubes are held by compression in gaskets at the top and bottom of each tube. Each upper gasket is seated in an adjustable retainer that allows removal of the tube as shown in Figure 4-5. Access to the flow tubes requires removal of the plexiglass front cover.

4.5.1 Disconnect all pipeline hoses and set the System Power switch to ON.

4.5.2 Close all cylinder valves except the O

valve.

4.5.3 Set the oxygen flow to 5 liters per min.

4.5.4 Open the other gas flow control valves to drain pressure from the system.

4.5.5 Close the O

cylinder valve, and close the flow control valves. Press the O2

Flush valve to drain oxygen pressure from the system.

4.5.6 Set the System Power switch to

STANDBY.

4.5.7 Loosen the screws holding the table top to the machine and lift out the table top.

4.5.8 Remove the screws holding the angled plate at the top of the flowmeter shield, and remove the plate.

4.5.9 Remove the oxygen flow control knob. The knob has two setscrews.

NOTE: If the knob must be rotated to allow access to a setscrew, carefully note its

position so that it can be re-assembled in the same position with the "Off Stop" properly set.

4.5.10 Remove the two screws holding the knob guard in place, and remove the knob guard.

4.5.11 Carefully remove the plexiglass cover from the front of the flowmeter housing.

4-15

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REPLACEMENT PROCEDURES (continued)

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NM MRI

FLOW TUBE RETAINER SCREW

UPPER FLOW TUBE RETAINER

FLOW TUBE

LIGHTING CHANNEL

FLOW RESTRICTOR

SV40605

GASKET

FIGURE 4-5. Flowmeters

GUIDE RING

4-16

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NM MRI

REPLACEMENT PROCEDURES (continued)

NOTE: The upper flow tube retainer screws can be loosened from the front of the

machine with a modified (short) allen wrench. Alternatively, the retainer screws can be reached through a slot in the bottom of the ventilator box. This requires removal of the top cover and the ventilator controller assembly to expose the slot.

4.5.12 Loosen the screw directly above the flowmeter tube to be replaced. Turning the screw counter clockwise will raise the upper flow tube retainer. Raise the retainer far enough to be able to pull the top of the tube outward, and remove the tube.

NOTE: If the bottom of the tube is seated in a flow restrictor, be sure that the arrangement of the restrictor and its gaskets is not disturbed.

4.5.13 Make sure that the replacement flow tube bears the correct markings and has a ball.

4.5.14 Place the bottom of the flowmeter tube into the guide ring of the lower gasket seal, and position the top of the flow tube into the center guide ring of the top gasket seal. It will be easier to hold the tube if the adjacent lighting channel is pulled forward and temporarily removed.

CAUTION: The flowmeter tube must be properly centered over the guide rings or damage to the flowmeter tube may occur.

4.5.15 Ensure that the markings on the flow tube are facing forward, and turn the upper retainer screw clockwise until the flow tube is firmly held in place.

CAUTION: Do not over-tighten the screw as the flowmeter tube may break.

4.5.16 Perform the following leak test on the system:

4.5.16.1 Disconnect the absorber hose from the fresh gas outlet. Ensure that all flow control valves are closed.

4.5.16.2 Connect a test gauge and B.P. bulb to the fresh gas outlet, and pressurize the system to 50 cm H

4.5.16.3 The pressure should not drop more than 10 cm H

O in thirty seconds.

4.5.17 Disconnect the test gauge and re-connect the absorber hose to the fresh gas outlet.

4.5.18 Replace any lighting channels that were previously removed.

4-17

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REPLACEMENT PROCEDURES (continued)

4.5.19 Place the plexiglass cover over the gauges and flow tubes, and ensure that the cover is fitted properly over the flow control valves.

4.5.20 Place the knob guard over the flow control valves and install its two retaining screws.

4.5.21 Install the oxygen flow control knob and tighten its setscrews. If the knobs are installed properly, their labels will be straight when the knobs are against their clockwise stops.

4.5.22 Replace the angled plate at the top of the plexiglass cover and secure it with the hardware that was previously removed.

4.5.23 Reinstall the table top and tighten its retaining screws.

4.5.24 Connect the pipeline hoses.

4.5.25 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

NM MRI

4.5.26 Perform the PMS Procedure given in Section 6.

4-18

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NM MRI

REPLACEMENT PROCEDURES (continued)

4.6 Flow Control Valves

The flow control valves have replaceable elements that are removable from the front of the flowmeter assembly as shown in Figure 4-6. Each flow control knob has a clockwise positive stop arrangement that prevents damage to the valve seat. Whenever a valve cartridge is replaced, the "off stop" must be set as outlined in the following procedure.

4.6.1 Disconnect all pipeline hoses and set the System Power switch to ON.

4.6.2 Close all cylinder valves except the O

valve.

4.6.3 Set the oxygen flow to 5 liters per min.

4.6.4 Open the other gas flow control valves to drain pressure from the system.

4.6.5 Close the O

cylinder valve and the O2 flow control valve. Press the O2 Flush

valve to drain oxygen pressure from the system.

4.6.6 Set the System Power switch to

STANDBY.

4.6.7 Remove the oxygen flow control knob.

4.6.8 Remove the two screws holding the knob guard in place, and remove the knob guard.

4.6.9 Remove the knob (if not already removed) from the valve that is being replaced, and remove the stop pin nut.

4.6.10 Remove the flow control valve by holding it at the wrench flats and turning it counter-clockwise.

4.6.11 Install the replacement flow control valve in the valve body.

CAUTION: Before tightening the cartridge, rotate the valve shaft several turns counter-clockwise to prevent bottoming the valve element into the seat when the cartridge is tightened.

4.6.12 Replace the stop pin nut.

4.6.13 Replace the knob guard and secure it with the two mounting screws.

4-19

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REPLACEMENT PROCEDURES (continued)

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NM MRI

FLOW CONTROL VALVE

STOP PIN NUT

VALVE

HOUSING

WRENCH

FLATS

KNOB GUARD

KNOBLABEL

FIGURE 4-6. Flow Control Valves

SV50502

4-20

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NM MRI

4.6.14 Turn the System Power switch to ON.

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REPLACEMENT PROCEDURES (continued)

4.6.15 A: For the O

flow control valve:

Open the oxygen cylinder valve.

Turn the flow control valve clockwise until the flow rate will not drop any further. (If the machine has been modified to eliminate the minimum flow feature, turn the valve until the flow rate is zero.)

4.5.15 B: For the other gas flow control valves:

Open the oxygen cylinder valve, and open the cylinder valve corresponding to the flow control valve replacement.

Set the oxygen flow rate to four liters per minute.

Turn the other gas flow control valve clockwise until the flow rate is zero.

4.6.16 Place the knob on the flow control valve shaft and turn it clockwise until it engages the stop pin. Tighten one of the knob setscrews.

4.6.17 Turn the knob in both directions and ensure that the flow can be controlled over its entire range. When the valve is closed, the knob should be against the clockwise stop. Tighten the remaining setscrew.

4.6.18 If the knob label is not horizontal when the valve is closed, remove the label and install a new label in the correct position.

4.6.19 Connect the pipeline hoses.

4.6.20 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.6.21 Perform the PMS Procedure given in Section 6.

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REPLACEMENT PROCEDURES (continued)

4.7 Auxiliary Oxygen Flow Meter

The auxiliary oxygen flowmeter is attached to the side of the machine's flowmeter housing by a stud and nut arrangement accessible from inside the housing. A flexible O

supply tube from the flowmeter connects to a hose barb fitting at the system

power switch. Figure 4-7 shows the mounting and tubing arrangement.

4.7.1 Disconnect all pipeline hoses and close all cylinder valves.

NM MRI

4.7.2 Press the O

Flush button to drain oxygen pressure from the system.

4.7.3 Turn the System Power switch to STANDBY and remove AC power from the machine.

4.7.4 Remove the back cover from the flowmeter housing.

4.7.5 Cut the tie strap on the flexible tube at the system power switch, and remove the tube.

4.7.6 Remove the nuts securing the auxiliary O

flowmeter, and remove the

flowmeter.

4.7.7 Position the replacement flowmeter at the side of the flowmeter housing (feed the flex tubing through the clearance hole) and secure the auxiliary O flowmeter with the two nuts that were previously removed.

4.7.8 Connect the flex tubing to the hose barb fitting behind the Clippard valve, and secure it with a tie strap.

4.7.9 Reinstall the flowmeter housing back cover.

4.7.10 Connect the pipeline hoses and restore AC power to the machine.

4.7.11 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.7.12 Perform the PMS Procedure given in Section 6.

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PRESS-ON HOSE CLAMP

FLEX TUBING

KEP HEX NUT (2X)

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REPLACEMENT PROCEDURES (continued)

AUXILIARY O2

FLOWMETER

FLEX TUBING

TIE STRAP

SV00097

FIGURE 4-7. Auxiliary O2 Flowmeter

Rev. G

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REPLACEMENT PROCEDURES (continued)

4.8 Oxygen Supply Pressure Failure Protection Device

The oxygen supply failure protection devices (failsafe assemblies) are located within the flowmeter housing. Access to these assemblies requires removal of the rear cover. Figure 4-8 shows a typical arrangement of a failsafe assembly and its connections.

4.8.1 Disconnect all pipeline hoses and set the System Power switch to ON.

NM MRI

4.8.2 Close all cylinder valves except the O

valve.

4.8.3 Set the oxygen flow to 5 liters per min.

4.8.4 Open the other gas flow control valves to drain pressure from the system.

4.8.5 Close the O

cylinder valve and the O2 flow control valve. Press the O2 Flush

valve to drain oxygen pressure from the system.

4.8.6 Set the System Power switch to

STANDBY.

4.8.7 Remove the screws holding the rear cover, and remove the cover.

4.8.8 Disconnect the flexible O

control line.

4.8.9 Disconnect the compression fittings at the side ports and at the check valve, and remove the assembly.

NOTE: If fittings must be installed in the replacement block assembly, use Loctite

#271 (red). Fittings are listed in parts section.

NOTE: Canadian machines have a relief valve in the right side (viewed from the

back of the machine) port of the Air failsafe assembly.

4.8.10 Install the replacement failsafe assembly, and tighten the three compression fittings.

4.8.11 Connect the flexible tubing to the control port, and secure the connection with the hose clamp.

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OXYGEN SUPPLY

FAILURE PROTECTION DEVICE

(N2O CONTROL DEVICE ILLUSTRATED)

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REPLACEMENT PROCEDURES (continued)

O2 CONTROL LINE

TO N2O FLOW

CONTROL VALVE

FROM CYLINDER

PRESSURE

REGULATOR

FROM PIPELINE

INLET ASSEMBLY

FIGURE 4-8. Oxygen Supply Failure Protection Device

CHECK VALVE

SV50536

4-25

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REPLACEMENT PROCEDURES (continued)

4.8.12 Perform the following test:

4.8.12.1 Open the cylinder valves.

4.8.12.2 Set the System Power switch to ON.

4.8.12.3 Set the oxygen flow to five liters per minute.

4.8.12.4 Set the other gas flow to five liters per minute.

4.8.12.5 Close the oxygen cylinder valve.

4.8.12.6 As the oxygen flow decreases, the other gas flow should stop.

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NM MRI

4.8.12.7 Set the System Power switch to

STANDBY.

4.8.13 Reinstall the rear cover and its retaining screws.

4.8.14 Connect the pipeline hoses.

4.8.15 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.8.16 Perform the PMS Procedure given in Section 6.

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REPLACEMENT PROCEDURES (continued)

4.9 Alarm Channel and Oxygen Supply Pressure Alarm Switch

The alarm channel assembly includes the oxygen supply pressure alarm switch, the alarm circuit board, and the system power switch.

NOTE: Service replacement alarm channel assemblies are supplied without the O

supply pressure alarm switch and wire harness.

Whenever the alarm channel is replaced, the oxygen supply pressure alarm switch must be tested to ensure that its operating point is set correctly. Removal of the alarm channel requires removal of the upper flowmeter angled plate from the front of the machine, and removal of the flowmeter housing rear cover. The alarm channel assembly is held in place by two screws from the back. Figure 4-9 shows a rear view of the assembly and its connections.

4.9.1 Disconnect all pipeline hoses and set the System Power switch to ON.

4.9.2 Close all cylinder valves except the O

valve.

4.9.3 Set the oxygen flow to 5 liters per min.

4.9.4 Open the other gas flow control valves to drain pressure from the system.

4.9.5 Close the O

cylinder valve and the O2 flow control valve. Press the O2 Flush

valve to drain oxygen pressure from the system.

4.9.6 Set the System Power switch to

STANDBY, and remove AC power from the

machine.

Rev. E

4.9.7 Remove the cover from the battery box (ref. Battery Replacement Procedure) and disconnect the battery wire harness from the PCB.

4.9.8 Remove the screws holding the flowmeter shield and vapor box front cover panel, and remove the panel.

4.9.9 Remove the screws holding the flowmeter housing rear cover, and remove the cover.

4.9.10 Loosen the screws holding the table top, and lift out the table top.

4.9.11 Disconnect the cables from J2, J3 and J4 on the alarm circuit board. On later machines with VPO monitors, disconnect the cable from J1; disconnect the floating grounds as needed.

4.9.12 Disconnect the compression fitting on the O

line nearest to the oxygen

supply pressure alarm switch.

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REPLACEMENT PROCEDURES (continued)

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UPPER ALARM CHANNEL MOUNTING SCREW

ALARM CIRCUIT BOARD

O2 CONNECTIONS

REAR VIEW

SIDE VIEW

SV00395

GROUND

CONNECTION

AUXILARY O2

FLOWMETER

CONNECTION

ADJUSTMENT

WHEEL INCREASE SETPOINT

OXYGEN

SUPPLY

PRESSURE

DECREASE

SETPOINT

SWITCH

LOWER ALARM CHANNEL MOUNTING SCREW

FIGURE 4-9. Alarm Channel (Core-M Version) and O2 Supply Pressure Alarm Switch

ALARM

COM.

N.C.

4-28

Rev. F

Page 65

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REPLACEMENT PROCEDURES (continued)

UPPER ALARM CHANNEL MOUNTING SCREW

O2 CONNECTIONS

REAR VIEW

FLOATING

GROUND DETAIL

CAP

ALARM

CIRCUIT

BOARD

AUXILARY O2

FLOWMETER

CONNECTION

SIDE VIEW

ADJUSTMENT

WHEEL INCREASE

SETPOINT

DECREASE

SETPOINT

LOWER ALARM CHANNEL MOUNTING SCREW

Alarm Channel (VPO Version) and O2 Supply Pressure Alarm Switch

Rev. F

OXYGEN

SUPPLY

PRESSURE

ALARM

SWITCH

COM.

SV00099

N.C.

4-28A

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REPLACEMENT PROCEDURES (continued)

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4-28B

Rev. F

Page 67

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REPLACEMENT PROCEDURES (continued)

4.9.13 Disconnect the remaining two O2 lines at the top and bottom of the tee fitting.

4.9.14 If the machine is equipped with an auxiliary O

flowmeter, cut the tie strap

on its flexible line and carefully remove the flex line from the hose barb.

4.9.15 From the back of the flowmeter housing, remove the upper and lower alarm channel mounting screws.

4.9.16 At the front of the machine, pull the alarm channel assembly forward, and feed the flowmeter lights wire harness through the hole at the top of the alarm channel.

4.9.17 Disconnect the yellow and purple wires from the oxygen supply pressure alarm switch.

4.9.18 The following steps apply to replacement of the oxygen supply pressure alarm switch.

4.9.19 Remove the alarm switch from the assembly at point

A as shown in the

illustration.

4.9.20 Install the replacement alarm switch with sealing tape on the threads, and ensure that the switch is oriented on the assembly as shown in the illustration.

4.9.21 Connect the yellow and purple wires to the replacement switch in the same manner as the original.

4.9.22 Feed the flowmeter lights wire harness through the hole at the top of the alarm channel, and set the alarm channel assembly into place.

4.9.23 Install the upper and lower alarm channel mounting screws.

4.9.24 If applicable, reconnect the flex line from the auxiliary O

flowmeter and

install a new tie strap at the hose barb.

4.9.25 Reconnect the the O

lines, and tighten the three compression fittings.

4.9.26 Reconnect the cables to J1 (if applicable), J2, J3 and J4 on the alarm circuit board. If applicable, ensure that the floating ground connectors are assembled as shown in the illustration, and the cover cap is in place.

4.9.27 Reinstall the front flowmeter cover with the screws that were previously removed.

Rev. F

4-29

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REPLACEMENT PROCEDURES (continued)

4.9.28 Locate the tee fitting in the ¼ in. diameter output line of the O2 regulator and remove the plug from the tee fitting.

NM MRI

4.9.29 Connect a dedicated O

test gauge to the tee fitting.

4.9.30 Reconnect the battery wire harness in the battery box, and reinstall the battery box cover.

4.9.31 Open the oxygen cylinder valve and turn the System Power switch to ON.

4.9.32 Set the oxygen flow to five liters per minute.

4.9.33 Close the oxygen cylinder valve.

4.9.34 As the pressure drops, the O

SUPPLY alarm should activate when the

pressure is between 40 and 34 psi as shown on the test gauge.

4.9.35 If the alarm activates when the pressure is below 34 psi or above above 40 psi, turn the adjustment wheel (see illustration), repeat the test and adjust as necessary to bring the set point into the correct range.

4.9.36 Turn the System Power switch to

STANDBY.

4.9.37 Disconnect the test gauge and replace the plug in the regulator line tee fitting.

4.9.38 Reinstall the table top and tighten its retaining screws.

4.9.39 Reinstall the flowmeter housing rear cover and its retaining screws.

4.9.40 Connect the pipeline hoses.

4.9.41 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.9.42 Perform the PMS Procedure given in Section 6.

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NM MRI

REPLACEMENT PROCEDURES (continued)

4.10 Oxygen Ratio Controller

The Oxygen Ratio Controller (ORC) is part of the N2O flowmeter sub-assembly and is located within the flowmeter housing. The ORC is accessible by removing the rear flowmeter housing cover. Figure 4-10 shows a typical ORC location and mounting arrangement, with a detail of the O-rings and filter.

4.10.1 Disconnect all pipeline hoses and set the System Power switch to ON.

4.10.2 Close all cylinder valves except the O

valve.

4.10.3 Set the oxygen flow to 5 liters per min.

4.10.4 Open the other gas flow control valves to drain pressure from the system.

4.10.5 Close the O

cylinder valve and the O2 flow control valve. Press the O2 Flush

valve to drain oxygen pressure from the system.

4.10.6 Set the System Power switch to STANDBY.

4.10.7 Remove the press-on clamp securing the flexible O

line to the ORC, and

carefully disconnect the tubing from the hose barb.

4.10.8 Remove the three screws holding the ORC to the flowmeter sub-assembly, and carefully remove the ORC from the flowmeter housing.

4.10.9 Install the 6 in. length of flexible tubing with a blue N

O label on the

replacement ORC (see detail view in illustration) Secure each connection with a press-on hose clamp.

Position the replacement ORC at the back of the N

O flowmeter sub-

assembly; be sure that its O-rings and filter are in place, and install its three mounting screws.

4.10.10 Connect the flexible O clamp.

4.10.11 Open the O

and N2O cylinder valves.

line to the ORC and secure it with the press-on hose

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REPLACEMENT PROCEDURES (continued)

REAR VIEW OF FLOWMETER HOUSING

WITH REAR COVER REMOVED

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NM MRI

ADJUSTING SCREW

LOCKNUT

O2 CONNECTION

ORC ASSEMBLY

O-RING

#105

(NEOPRENE)

FILTER

O-RING

0.066 X 0.042 (BUNA-N)

FIGURE 4-10. Oxygen Ratio Controller

ORC ASSEMBLY

MOUNTING SCREWS (3X)

SV00064

4-32

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REPLACEMENT PROCEDURES (continued)

4.10.12 Perform the ORC adjustment procedure given in Section 5 of this manual.

4.10.13 Reinstall the flowmeter housing rear cover.

4.10.14 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.10.15 Perform the PMS Procedure given in Section 6.

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REPLACEMENT PROCEDURES (continued)

4.11 Vaporizers

The vaporizer is held to the machine by two metric sized hex screws. These screws are located at the back of the vaporizer mounting block as shown in Figure 4-11. Before removing the vaporizer from the machine, it must be completely drained and dried in accordance with the procedure given below. Be sure to have a suitable packing or storage container available in which to place the vaporizer.

CAUTION: The following steps must be performed in the sequence given.

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4.11.1 Turn the System Power switch to

ON.

4.11.2 Set the vaporizer handwheel to its Zero or OFF position.

WARNING: Do not inhale anesthetic vapors as this could result in personal injury.

4.11.3 Remove the filler and drain plugs, and drain the vaporizer into a suitable container. Dispose of the residual agent in an approved manner.

4.11.4 Turn the vaporizer handwheel to the maximum concentration setting.

4.11.5 Set the oxygen flow to 10 l/min. for at least 20 minutes.

WARNING: This procedure must be performed in a well ventilated area and without unauthorized personnel present.

4.11.6 Turn the vaporizer handwheel to 0 (zero), and replace the filler and drain plugs.

4.11.7 Turn the oxygen flow off, and turn the System Power switch to

STANDBY.

4.11.8 While holding the vaporizer, remove the mounting screws and carefully separate the vaporizer from the machine. Note the arrangement of gaskets so that the replacement vaporizer can be installed in the same manner.

4.11.9 Place the vaporizer in a suitable container for transport or storage.

WARNING: Do not tilt a vaporizer that contains anesthetic agent more than 45 degrees. Failure to observe this precaution will render the handwheel calibration invalid.

4-34

Rev. E

Page 73

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REPLACEMENT PROCEDURES (continued)

MOUNTING

SCREWS

(SUPPLIED)

(P/N HW01072)

SV00067

VAPORIZER

MOUNTING BLOCK

O-RINGS

(P/N 2121929)

FIGURE 4-11. Vaporizer Installation

Rev. E

4-35

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REPLACEMENT PROCEDURES (continued)

NOTE: Should a vaporizer containing anesthetic agent be accidentally tilted more than 45 degrees, it must be drained and flushed in accordance with instructions given in the manual supplied with the vaporizer.

4.11.10 Set the handwheel on the replacement vaporizer to its Zero position.

4.11.11 Install the replacement vaporizer on the machine (be sure the O-rings are in place) and tighten the mounting screws to a torque of 24 to 26.5 inch pounds.

4.11.12 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.11.13 Perform the PMS Procedure given in Section 6.

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REPLACEMENT PROCEDURES (continued)

4.12 O2 Flush Valve

The O2 flush valve is located at the front of the machine next to the fresh gas outlet. Access to the flush valve requires removal of the table top and the table bottom cover. Figure 4-12 shows the mounting and assembly details of the flush valve.

4.12.1 Turn the System Power switch to

STANDBY.

4.12.2 Disconnect all pipeline hoses.

4.12.3 Close the O

4.12.4 Press the O

cylinder valve.

Flush valve to drain oxygen pressure from the system.

4.12.5 Loosen the screws holding the table top to the machine and lift out the table top.

4.12.6 Remove the screws securing the table bottom cover to the machine frame, and remove the bottom cover. (These screws are accessible after the table top is removed.)

4.12.7 Hold the O

Flush button in and rotate it until one of its set screws are

visible through an access hole in the guard ring, and loosen the set screw.

4.12.8 Turn the O

Flush button 180 degrees, hold it in and loosen the other set

screw.

4.12.9 Remove the O

Flush button and washer from the valve shaft.

4.12.10 Disconnect the two compression fittings at the valve.

NOTE: Do not lose the flow restrictor located at the right-angle fitting. This

restrictor will be transferred to the replacement valve assembly.

4.12.11 The O

Flush valve is retained by the guard ring on the front of the machine

frame. Hold the body of the Clippard valve with an open end wrench; insert a rod or hex wrench through the holes in the guard ring (or use a spanner wrench), and un-screw the guard ring from the front of the frame rail.

4.12.12 Assemble the replacement O

Flush valve, spacer, internal tooth lock

washer and guard ring through the frame and tighten the assembly, making sure that the valve is mounted straight.

4.12.13 Connect the compression fittings to the valve. Be sure the flow restrictor is in place at the right-angle fitting.

4-37

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REPLACEMENT PROCEDURES (continued)

O2 FLUSH VALVE

SPACER

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COMPRESSION

FITTING

RESTRICTOR

INTERNAL TOOTH LOCKWASHER

GUARD RING

SET SCREWS

FIGURE 4-12. O2 Flush Valve

ACCESS HOLES

WASHER

PUSH BUTTON

FRONT VIEW WITH

TABLE TOP REMOVED

SV49099

4-38

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REPLACEMENT PROCEDURES (continued)

4.12.14 Place the washer and the O2 Flush button on the valve shaft.

4.12.15 Hold the O

Flush button in and turn it until a set screw is visible through

an access hole in the guard ring. Tighten the set screw. Rotate the button 180 degrees until the other set screw is visible, and tighten the set screw.

4.12.16 Disconnect the absorber fresh gas hose from the fresh gas outlet. Connect a test gauge and B.P. bulb to the fresh gas outlet, and perform the following test:

4.12.16.1 Open the oxygen cylinder valve and allow the pressure to stabilize. (The cylinder pressure must be at least 1000 psi for this test.)

4.12.16.2 Release any pressure that is indicated on the test gauge.

4.12.16.3 Over the next 60 seconds, the test gauge should not show a pressure increase greater than 2 cm H

4.12.16.4 Increase the pressure to 50 cm H

4.12.16.5 The pressure should not drop more than 10 cm H

O in the next 30

seconds.

4.12.16.6 Disconnect the test gauge from the fresh gas outlet.

4.12.16.7 Close the oxygen cylinder valve.

4.12.16.8 The pressure should not drop more than 50 psi in two minutes.

4.12.16.9 Connect a volumeter to the fresh gas outlet, and reset the volumeter to zero.

4.12.16.10Press the O

Flush button and observe the flow rate. It should be

between 45 and 65 liters per minute.

4.12.16.11 Disconnect the volumeter from the fresh gas outlet.

4.12.17 Connect the absorber fresh gas hose to the fresh gas outlet.

4.12.18 Reinstall the table bottom cover.

4.12.19 Reinstall the table top and tighten its mounting screws.

4.12.20 Connect the pipeline hoses.

4.12.21 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.12.22 Perform the PMS Procedure given in Section 6.

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REPLACEMENT PROCEDURES (continued)

4.13 Core-M Monitor

The monitor is attached to the left side of the ventilator box. Access to the attaching hardware requires removal of the ventilator box top cover. Figure 4-13 shows the mounting and power connection arrangement for the monitor.

NOTE: The monitor is replaced as a complete unit when necessary. It is not to be

serviced internally.

4.13.1 Turn the System Power switch to STANDBY.

4.13.2 Disconnect all sensor inputs at the back of the monitor.

4.13.3 Disconnect the external monitor power cable by unscrewing its retaining ring and pulling out the cable.

4.13.4 Remove the ventilator box top cover.

NM MRI

4.13.5 While holding the monitor, remove its two mounting screws at the left inside wall of the ventilator box.

4.13.6 Position the replacement monitor at the left side of the ventilator box, and attach the monitor to the side of the ventilator box with the hardware that was previously removed.

4.13.7 Reinstall the ventilator box top cover.

4.13.8 Connect the external monitor power cable and secure it with the retaining ring.

4.13.9 Restore all sensor connections to the monitor and verify that it is working correctly.

4.13.10 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.13.11 Perform the PMS Procedure given in Section 6.

4-40

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SV00074

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REPLACEMENT PROCEDURES (continued)

LEFT SIDE VIEW OF MACHINE

MONITOR MOUNTING SCREW (2X)

LOCKWASHER (2X)

MONITOR POWER CABLE

RETAINING RING

MONITOR

POWER INPUT

CONNECTOR

FIGURE 4-13. Core-M Monitor Replacement

4-41

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REPLACEMENT PROCEDURES (continued)

4.13A VPO Monitor

The VPO monitor is attached to the left side of the ventilator box with two kep nuts. Access to the attaching hardware requires removal of the ventilator box top cover. The monitor is supplied with cables attached. Two of the cables have flying connectors in the ventilator ventilator box; the ribbon cable connects to J1 on the alarm channel PCB. You will need to remove the flowmeter housing back cover for access to the alarm channel connector. Figure 4-13A shows the mounting and connection arrangement for the monitor.

NOTE: The monitor is replaced as a complete unit when necessary. It is not to be

serviced below this level.

4.13A.1 Turn the System Power switch to STANDBY.

4.13A.2 Disconnect all sensor inputs at the back of the monitor.

4.13A.3 Remove the ventilator box top cover, and the flowmeter housing back cover.

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4.13A.4 Disconnect the cable from J1 on the alarm channel PCB and from the floating ground assembly. Feed the cable end up into the ventilator box.

4.13A.5 Disconnect the flying connectors on the monitor cables in the ventilator box.

4.13A.6 While supporting the monitor, remove its two mounting nuts at the left inside wall of the ventilator box. Carefully feed the attached monitor cables out through the side of the ventilator box.

4.13A.7 Position the replacement monitor at the left side of the ventilator box, feed the attached cables into the ventilator box and attach the monitor to the side of the ventilator box with the nuts that were previously removed.

4.13A.8 Feed the alarm channel cable down through the opening in the floor of the ventilator box and connect it to J1 on the alarm channel PCB. Connect its ground lead to the floating ground assembly. Ensure that the cover cap is in place.

4.13A.9 Join the remaining monitor cables to their flying connectors in the ventilator box.

4.13A.10Reinstall the ventilator box top cover, and the flowmeter housing back cover.

4.13A.11Restore all sensor connections to the monitor.

4.13A.12Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.13A.13Perform the PMS Procedure given in Section 6.

4-41A

Rev. F

Page 81

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REPLACEMENT PROCEDURES (continued)

TOP VIEW OF VENTILATOR BOX

WITH COVER REMOVED

NAD

MONITOR

9-PIN CABLE FROM

FLOW SENSOR MODULE

POWER CABLE FROM

J7 IN BATTERY BOX

CABLE TO ALARM

CHANNEL J1

SV00040

MOUNTING

NUTS

Figure 4-13A. VPO Monitor Replacement

Rev. F

4-41B

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REPLACEMENT PROCEDURES (continued)

4.14 AV2+ Ventilator Controller Assembly (MRI)

The Ventilator Controller assembly is retained in the ventilator box by two screws at the left side of the bezel. Access to these screws requires removal of the monitor from the ventilator box. Figure 4-14 shows the mounting arrangement, along with the electrical and pneumatic connections to the controller.

NOTE: In the MRI system, the ventilator solenoid is remotely located in the battery

box at the bottom of the machine. Refer to the

Ventilator Solenoid Assembly

replacement procedure if needed.

NOTE: The AV2+ ventilator shall not be serviced below this level, with the

exception of the following: knobs, pressure regulator, gauge and gauge cover. Please refer to Section 8: Spare and Replacement Parts, for part numbers.

4.14.1 Turn the System Power switch to STANDBY and remove AC power from the machine.

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4.14.2 Disconnect batteries by removing bottom plate over battery box, then remove connector J2 from the battery box PCB.

4.14.3 Disconnect all pipeline hoses and close all cylinder valves.

CAUTION: The controller circuit board contains static sensitive devices. Use ESD protection when handling the ventilator controller assembly.

4.14.4 Remove the top cover from the ventilator box.

4.14.5 Remove the writing tray.

4.14.6 Remove the monitor from the machine. Refer to the Core-M or VPO Monitor replacement procedure - whichever applies.

4.14.7 Remove the battery box corner access plate.

4.14.8 Disconnect the red and white wires from the feed-thru filters on the rear bulkhead of the shield box. Note the arrangement of these wires so they can be connected to the replacement assembly in the same manner.

4.14.9 Disconnect the black ground wire from the stud on the shield box bulkhead.

NOTE: If the ground wire is not connected to the stud but is clamped under the

aluminum block (see dotted line in the illustration), pull the ground wire out, straighten it, and install the ring terminal supplied with the service exchange AV2+ controller assembly (P/N SE4113132-006) on the wire.

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REPLACEMENT PROCEDURES (continued)

ALUMINUM BLOCK

REAR VIEW DETAIL OF

SHIELD BOX AND

FEED-THRU FILTER

ASSEMBLY

FEED-THRU FILTER (2X)

CABLE TO ALARM CHANNEL

ALUMINUM BLOCK

TO AUTO-RANGING VALVE

TO VENTURI

FEED-THRU FILTERS

SHIELD BOX

FIBER OPTIC CABLE

TO RX1 ON

BATTERY BOX PCB

GROUND WIRE, VPO VERSION

(DOTTED LINE SHOWS CORE-M

VERSION WITH GROUND WIRE

CLAMPED UNDER

ALUMINIUM BLOCK)

COAXIAL CABLE

FIBER OPTIC CABLE TO BATTERY BOX

FROM SOLENOID

TO ALARM CHANNEL

SUPPLY

SHIELD BOX

RETAINING SCREWS (2X)

FIBER OPTIC

TRANSMITTER

BOARD

FIGURE 4-14. AV2+ Ventilator Controller (MRI) Assembly

Rev. F

4-43

SOLENOID

SV00066

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REPLACEMENT PROCEDURES (continued)

4.14.10 Disconnect the fiber optic cable from RX1 on the battery box PCB. (See illustration.)

4.14.11 Feed the fiber optic cable up from the battery box to the AV2+ controller. Carefully coil the fiber optic cable and secure it to the AV2+ controller.

4.14.12 Remove the two screws securing the left end of the ventilator controller panel.

4.14.13 Pull the left side of the panel outward, slide it to the left until the locking tab on the right side of the panel is clear of its receptacle, then pull the assembly out far enough to gain access to its connections

NOTE: Skip the next step if your machine has a Core-M monitor.

4.14.14 For later version machines with a VPO monitor, disconnect the cable from J3 on the alarm channel PCB. Remove the coaxial cable from this 9-pin connector using the white end of the pin extraction tool supplied with the service exchange unit. Disconnect the coaxial cable’s shield from the ground wire assembly.

NM MRI

4.14.15 Disconnect the following large and small diameter pneumatic tubing (the letters are keyed to the letters in Figure 4-14):

A: O

supply tube

B: Tube to remote solenoid C: Tube from solenoid D: Tube to auto-ranging valve E: Tube to venturi

4.14.16 Remove the controller assembly from the machine.

4.14.17 Position the replacement controller assembly in the ventilator box.

NOTE: Ensure that the mylar shield between the controller and the machine head

is in position.

4.14.18 Reconnect the red and white wires to the two feed-thru filters on the rear of the shield box box in the same manner as original. Reconnect the pneumatic lines.

4.14.19 Slide the replacement controller into the ventilator box, carefully fit the locking tab into its receptacle at the right side of the panel, and slide the assembly to the right until it is properly seated.

4.14.20 Reinstall the two retaining screws at the left side of the panel.

4.14.21 Connect the ground wire to the stud on the rear of the shield box.

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REPLACEMENT PROCEDURES (continued)

4.14.22 Feed the fiber optic cable from the ventilator controller down through the flowmeter housing and down through the frame leg and into the battery box area.

4.14.23 Secure the fiber optic cable in the cable hold-down in the battery box assembly.

4.14.24 Connect the fiber optic cable to RX1 on the battery box PCB.

NOTE: Skip the next step if your machine has a Core-M monitor.

4.14.25 For later version machines with a VPO monitor, reinstall the coaxial cable in the 9-pin connector as shown in the illustration, and plug the connector into J3 on the alarm channel. Connect the coaxial cable’s shield to the floating ground wire assembly.

4.14.26 Reinstall the monitor.

4.14.27 Reinstall the ventilator box top cover.

4.14.28 Reinstall the writing tray.

4.14.29 Reinstall the battery box top cover.

4.14.30 Reinstall battery box corner access plate.

4.14.31 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.14.32 Perform the PMS Procedure given in Section 6.

4.14.33 Perform the Imaging Test Protocol (ITP) procedure given in Section 7 of the

Narkomed MRI Setup and Installation Manual.

4.14.34 Complete the ITP form and associated checklist, Service Report, and return them to Draeger Medical, Inc. Service Department.

NOTE: For machines with a VPO monitor: Return the pin extraction tool with the

AV2+ controller unit to DrägerService.

Rev. F

4-44A

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4-44B

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REPLACEMENT PROCEDURES (continued)

4.15 Ventilator Solenoid Assembly

The ventilator solenoid is remotely located within a double shielded housing in the battery box at the bottom of the machine. The solenoid and housing are replaced as a complete assembly. Figure 4-15 shows the pneumatic and electrical connections, and the mounting arrangement of the solenoid housing.

4.15.1 Turn the System Power switch to STANDBY.

4.15.2 Remove the top cover from the battery box at the bottom of the machine. On later machines with the ultrasonic flow sensor carefully remove the flow sensor cable strain relief bushing from its slot in the cover.

4.15.3 Disconnect the O

In and O2 Out tubing from the hose barbs at the back of

the housing.

4.15.4 Disconnect the solenoid cable.

4.15.5 Remove the screws securing the solenoid housing to the battery box, and lift out the assembly.

4.15.6 Install the replacement assembly in the battery box and secure it with the hardware that was previously removed.

4.15.7 Reconnect the solenoid cable, and reconnect the O

In and O2 Out tubes to

the hose barbs at the back of the housing.

4.15.8 Reinstall the battery box top cover. On later machines be sure that the flow sensor cable strain relief bushing is in the slot in the cover.

4.15.9 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.15.10 Perform the PMS Procedure given in Section 6.

Rev. E

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SOLENOID CABLE

CONNECTION

BATTERY BOX (AT BOTTOM OF MACHINE) SHOWN WITH COVER REMOVED

SOLENOID

HOUSING

ASSEMBLY

O2 OUT

O2 IN

SOLENOID HOUSING MOUNTING SCREWS AND LOCKWASHERS (4X)

FIGURE 4-15. Ventilator Remote Solenoid & Housing

4-46

SV00075

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REPLACEMENT PROCEDURES (continued)

4.16 Ventilator Bellows Valve and Guide Assembly with Pressure Limit Control

The Ventilator Bellows Valve and Guide Assembly, and the Pressure Limit Control are located in the bellows box on the left side of the machine. Access to the components requires removal of the bellows box front panel. Figure 4-16 shows the pneumatic connections and the mounting arrangement of the components.

4.16.1 Turn the System Power switch to STANDBY, and remove AC power from the machine.

4.16.2 Close all cylinder valves, and disconnect the pipeline hoses from the machine.

4.16.3 Press the O

Flush button to relieve pressure from the system.

4.16.4 Adjust the TIDAL VOLUME control to raise the volume indicator to its maximum setting.

4.16.5 Disconnect the breathing hose and the scavenger hose from the bellows assembly. Loosen the wing nuts and remove the bellows assembly.

4.16.6 Remove the canister from the bellows box by pulling it downward.

4.16.7 Unscrew the bellows adjustment tube from the bellows valve assembly.

4.16.8 Remove the screws holding the bellows box front panel and knob assemblies, and remove the panel.

4.16.9 Loosen the rear support plate screw, and remove the two front support plate screws.

4.16.10 Pull the support plate forward, then lower it to a point where the tubing connections are accessible.

4.16.11 Disconnect the large diameter tubing from the venturi, and the small diameter tubing from the auto-ranging valve.

4.16.12 Carefully remove the assembly from the machine.

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BELLOWS BOX

FRONT VIEW

BELLOWS GUIDE

CANISTER

10 1:2.5

FREQUENCY

/min

SV50514

I:E RATIO

FRONT PANEL

MOUNTING SCREWS (4X)

FRONT PANEL AND

KNOB ASSEMBLY

VOLUME INDICATOR

BELLOWS ASSEMBLY

FIGURE 4-16. Tidal Volume Adj. & Valve Case Assembly

4-48

ADJUSTMENT ROD

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REPLACEMENT PROCEDURES (continued)

BELLOWS ADJUSTMENT TUBE

BELLOWS BOX

FRONT VIEW WITH

FRONT PANEL REMOVED

BOTTOM VIEW OF

BELLOWS BOX

PRESSURE LIMIT CONTROL MOUNTING SCREWS (4X)

SV50414

FLEX TUBING

FROM CONTROLLER

UPPER BELLOWS

SUPPORT PLATE

SCREWS (3X)

Figure 4-16. Tidal Volume Adj. & Valve Case Assembly (continued)

4-49

VALVE CASE

ASSEMBLY

MOUNTING SCREWS

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REPLACEMENT PROCEDURES (continued)

4.16.13 Unscrew the bellows adjustment tube from the replacement bellows valve.

4.16.14 Position the support plate in the bellows box and reconnect the large and small diameter tubing that was previously removed.

4.16.15 Slide the support plate up and to the rear until it is seated properly in the bellows box.

4.16.16 Reinstall the two front support plate screws, and tighten the rear support plate screw.

4.16.17 Reinstall the bellows adjustment tube on the bellows valve.

4.16.18 Place the bellows box front panel into position, ensure that the slots in the knob assemblies are correctly aligned with their drive pins on the bellows adjustment and pressure limit control shafts, and reinstall the screws holding the front panel to the machine.

NM MRI

4.16.19 Replace the bellows canister; ensure that its markings are facing forward.

4.16.20 Replace the bellows assembly and tighten the wing nuts holding it in place.

4.16.21 Reconnect any hoses that were previously removed from the bellows assembly.

4.16.22 Reconnect the pipeline hoses and AC power cord.

4.16.23 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.16.24 Perform the PMS Procedure given in Section 6.

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REPLACEMENT PROCEDURES (continued)

4.17 Caster

The casters are threaded into the legs of the machine frame. A typical arrangement is shown in Figure 4-17. Caster replacement requires that the machine be tilted to provide enough clearance for the caster stem to be withdrawn from the bottom of the frame rail.

WARNING: Do not tilt the machine more than 10 degrees or raise the casters more than 3½ inches from the floor. Failure to observe this precaution may result in a tipover, causing personal injury. Vaporizers containing anesthetic agent may also be damaged.

4.17.1 Obtain a brace capable of supporting one side of the machine with its casters two to three inches from the floor.

4.17.2 Remove all unsecured equipment and accessories from the machine.

4.17.3 Lock the front casters.

4.17.4 Using at least two people, tilt the machine until the casters on one side are raised two to three inches from the floor, and position the support brace under the frame rail between the front and back casters.

4.17.5 Un-screw the caster from the frame using a caster wrench P/N S010055.

4.17.6 Apply an ample amount of Loctite #242 to the stem of each replacement caster, then thread the replacement caster into the frame leg and tighten the caster.

4.17.7 Using at least two people, tilt the machine, remove the support brace and carefully lower the machine to the floor.

4.17.8 Check for proper operation of the caster and ensure that the front casters lock properly.

4.17.9 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.17.10 Perform the PMS Procedure given in Section 6, including a vaporizer calibration verification.

4.17.11 Replace any unsecured equipment and accessories that were previously removed.

Rev. J

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SV00073

FIGURE 4-17. Caster Replacement

LOWER FRAME RAIL

THREADED STEM

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REPLACEMENT PROCEDURES (continued)

4.18 Battery

The backup battery is located in the battery box at the bottom of the machine. Access to the battery requires removal of the battery box cover. Figure 4-18 shows the battery connection and mounting arrangement on early machines. Figure 4-18A shows the battery connection and mounting arrangement on later machines with the VPO monitor.

4.18.1 Turn the System Power switch to STANDBY and remove the power cable from the back of the battery box.

4.18.2 Remove the top cover from the battery box. On later machines with the ultrasonic flow sensor carefully remove the flow sensor cable strain relief bushing from its slot in the cover.

4.18.3 Disconnect the battery wire harness from J2 on the PCB.

4.18.4 Remove the two retainer nuts, and remove the battery retainer.

4.18.5 Remove the battery from the battery box.

4.18.6 If needed, transfer the wire harness to the replacement battery (yellow wire to (+) terminal, black wire to (-) terminal) and ensure that the replacement battery is wrapped in a protective bag in the same manner as the original.

4.18.7 Place the replacement battery in the battery box, oriented as shown in the illustration.

4.18.8 Record the installation date on the battery.

4.18.9 Reinstall the battery retainer and the two retainer nuts.

4.18.10 Reconnect the battery wire harness to J2 on the PCB.

4.18.11 Reinstall the battery box top cover. On later machines be sure that the flow sensor cable strain relief bushing is in the slot in the cover.

4.18.12 Reconnect the power cable to the connector on the back of the battery box.

4.18.13 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.18.14 Perform the PMS Procedure given in Section 6.

End of Life Battery Disposal:

Dispose of a spent rechargeable, sealed lead-acid battery in conformance with local waste disposal regulations.

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4-53

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BATTERY RETAINER

RETAINER NUT (2X)

TERMINAL SCREW AND NUT (2X)

BATTERY WIRE HARNESS

BATTERY BOX (AT BOTTOM OF MACHINE) SHOWN WITH COVER REMOVED

BATTERY

FIGURE 4-18. Battery Replacement: Core-M Version

4-54

SV00255

Rev. F

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REPLACEMENT PROCEDURES (continued)

BATTERY RETAINER

BATTERY

RETAINER NUT (2X)

TERMINAL SCREW

AND NUT (2X)

BATTERY WIRE

HARNESS

BATTERY BOX (BACK VIEW WITH COVER REMOVED)

Figure 18A. Battery Replacement: Later Machines with VPO Monitor

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4-54A

SV00182

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REPLACEMENT PROCEDURES (continued)

4.19 Power Supply PCB

The power supply PCB is located in the battery box at the bottom of the machine. Access to the PCB requires removal of the battery box cover. Figure 4-19 shows the power supply PCB connection and mounting arrangement on early machines. Figure 19A shows the power supply PCB connection and mounting arrangement on later machines with the VPO monitor.

4.19.1 Turn the System Power switch to STANDBY and remove the power cable from the back of the battery box.

4.19.2 Remove the top cover from the battery box. On later machines with the ultrasonic flow sensor carefully remove the flow sensor cable strain relief bushing from its slot in the cover.

4.19.3 Disconnect the following from the PCB:

Machines with Core-M Monitor Machines with VPO Monitor

J1 Power in J1 Power in

J2 Battery J2 Battery

J3 Alarm Channel J3 Alarm Channel

J4 Power to Monitor J4 Flow Sensor Module J1

RX1 Fiber Optic Cable J5 Flow Sensor Module J2

J6 Solenoid J6 Solenoid

J7 Monitor Power

J8 Monitor hi field signal

RX1 Fiber Optic Cable

4.19.4 Remove the four screws securing the PCB, and lift the PCB from the battery box.

4.19.5 Install the replacement power supply PCB in the battery box with the hardware that was previously removed. Be sure the board is oriented as shown in the illustration.

Rev. E

4.19.6 Re-connect all cables and wire harnesses to the PCB.

4.19.7 Reinstall the battery box top cover. On later machines be sure that the flow sensor cable strain relief bushing is in the slot in the cover.

4.19.8 Reconnect the power cable to the connector on the back of the battery box.

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REPLACEMENT PROCEDURES (continued)

4.19.9 Carefully inspect the machine to verify that no loose screws, washers, or tools are left on or in any part of the machine.

4.19.10 Perform the PMS Procedure given in Section 6.

PCB MOUNTING SCREWS AND LOCKWASHERS (4X)

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J1 (POWER IN)

J2 (BATTERY)

J3 (TO ALARM CHANNEL)

J4 (TO EXTERNAL

MONITOR)

POWER SUPPLY

PCB ASSEMBLY

J6 (TO SOLENOID)

RX1 (FIBER OPTIC

CABLE FROM

CONTROLLER)

SV00076

BATTERY BOX (AT BOTTOM OF MACHINE) SHOWN WITH COVER REMOVED

FIGURE 4-19. Power Supply PCB Assembly Replacement

4-56

Rev. E

NORTH AMERICAN DRÄGER Drager Narkomed MRI User manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1.0 INTRODUCTION

1.1 Recommendations

1.2 How to use this Manual

1.3 General Troubleshooting Guidelines

1.4 General Warnings and Cautions

2.0 DIAGNOSTICS

2.1 Power-up Diagnostics

2.2 Main Service Screen

2.3 Service Log

2.4 PMS Criteria Screen

2.5 Oxygen Monitor Service Screen

2.6 Pressure Monitor Service Screen

3.0 TROUBLESHOOTING

3.1 Power Supply and Voltage Distribution

3.2 Battery

3.3 Troubleshooting Guides

4.0 REPLACEMENT PROCEDURES

4.1 Cylinder Yoke Assemblies

4.2 Cylinder Pressure Regulators

4.3 Cylinder Cutoff Valves (Canada)

4.4 Cylinder and Pipeline Pressure Gauges

4.5 Flowmeters

4.6 Flow Control Valves

4.7 Auxiliary Oxygen Flow Meter

4.8 Oxygen Supply Pressure Failure Protection Device

4.9 Alarm Channel and Oxygen Supply Pressure Alarm Switch

4.10 Oxygen Ratio Controller

4.11 Vaporizers

4.12 O2 Flush Valve

4.13 Core-M Monitor

4.13A VPO Monitor

4.14 AV2+ Ventilator Controller Assembly (MRI)

4.15 Ventilator Solenoid Assembly

4.16 Ventilator Bellows Valve and Guide Assembly with Pressure Limit Control

4.17 Caster

4.18 Battery

4.19 Power Supply PCB