Datex-Ohmeda Giraffe OmniBed Service manual

Name: Datex-Ohmeda Giraffe OmniBed
Brand: Datex-Ohmeda
SKU: 7456413
Rating: 4.5 (2 reviews)

4.5 (2)

GE Healthcare

Giraffe® OmniBed

Service Manual

To reorder this manual, order kit:

• 6600-0834-801 (USA)

• 6600-0834-802 (INTL)

6600-0343-000 104

All rights reserved. General Electric Company reserves the right to make changes in specifications and features shown herein, or discontinue the product described at any time without notice or obligation. Contact your

GE Representative for the most current information. Giraffe and Panda® are registered trademarks owned by Datex-Ohmeda, Inc. GE and GE Monogram are trademarks of General Electric Company. All other company and product names mentioned may be trademarks of the companies with which they are associated.

Table of Contents

About this Manual...........................................................................................................	xv
Scope and Intended Users.....................................................................................................................................	xv
Conventions..................................................................................................................................................................	xv
References ...................................................................................................................................................................	xvi
Symbol Definitions....................................................................................................................................................	xvi
User Responsibility..................................................................................................................................................	xviii
Important....................................................................................................................................................................	xviii
Technical Competence...........................................................................................................................................	xix
Warnings.......................................................................................................................................................................	xix
Cautions .........................................................................................................................................................................	xx
Chapter 1: Functional Description..................................................................................	1
1.1 Control Board..........................................................................................................................................................	1
1.2 Relay Board .............................................................................................................................................................	3
1.3 Display Driver Board / EL Display .................................................................................................................	4
1.4 LED Board.................................................................................................................................................................	5
1.5 Power Supply..........................................................................................................................................................	5
1.6 Peripheral Components.....................................................................................................................................	5
1.6.1 Rail and Heater Door Switches.........................................................................................................	6
1.7 DataLink Option.....................................................................................................................................................	6
1.8 Servo Controlled Oxygen Option....................................................................................................................	7
1.9 Humidifier ................................................................................................................................................................	9
Chapter 2: Service Checkout.........................................................................................	11
2.1 Setup........................................................................................................................................................................	11
2.2 Mechanical Checks...........................................................................................................................................	11
2.3 Controller Checks...............................................................................................................................................	12
2.4 Humidity Check...................................................................................................................................................	14
2.5 Servo Controlled Oxygen Check..................................................................................................................	14
2.5.1 Leak Check..............................................................................................................................................	14
2.5.2 Pre-use Checkout................................................................................................................................	14
2.5.3 Supply Valve Leak Test......................................................................................................................	15

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Table of Contents

2.6 Scale Check...........................................................................................................................................................	16
2.6.1 Mechanical Check...............................................................................................................................	16
2.6.2 Weight Checks......................................................................................................................................	16
2.6.2.1 Center Weight Check............................................................................................................	16
2.6.2.2 Off Center Weight Check....................................................................................................	17
2.7 Other Accessory Checks.................................................................................................................................	17
2.8 Cable Connections and Mechanical Controls.......................................................................................	18
Chapter 3: Calibration and Maintenance....................................................................	21
3.1 Service Maintenance Schedule...................................................................................................................	21
3.2 Special Tools.........................................................................................................................................................	23
3.3 System Calibration............................................................................................................................................	23
3.4 Line Voltage Calibration..................................................................................................................................	24
3.5 Humidifier Calibration......................................................................................................................................	25
3.6 Servo Controlled Oxygen Calibration........................................................................................................	26
3.7 Scale Calibration.................................................................................................................................................	26
3.8 Leakage Current.................................................................................................................................................	27
3.9 Ground Resistance Check..............................................................................................................................	27
Chapter 4: Troubleshooting...........................................................................................	29
4.1 Startup Sequence..............................................................................................................................................	29
4.2 Service Screen.....................................................................................................................................................	30
4.3 Alarm Messages.................................................................................................................................................	34
4.3.1 “Air Probe Failure” Alarm..................................................................................................................	34
4.3.2 “Air Temp >38C” or “Air Temp >40C” Alarm.............................................................................	34
4.3.3 “Baby Hot” or “Baby Cold” Alarm..................................................................................................	34
4.3.4 “Baby Mode Disabled” Alarm.........................................................................................................	35
4.3.5 “Baby Probe 1 Failure” or “Baby Probe 2 Failure” Alarm....................................................	35
4.3.6 “Bad Membrane Switch” Alarm.....................................................................................................	35
4.3.7 “Bed Heater Failure” Alarm.............................................................................................................	36
4.3.8 “Bed Up/Down Pedal Failure” Alarm...........................................................................................	36
4.3.9 “Bed Up/Down Pedal Switches Disabled” Alarm...................................................................	36
4.3.10 “Canopy Pedal Disabled” Alarm.................................................................................................	37
4.3.11 “Canopy Pedal Failure” Alarm.....................................................................................................	37
4.3.12 “Canopy Pedal Pressed” Alarm...................................................................................................	37
4.3.13 “Down Pedal Pressed” Alarm.......................................................................................................	37
4.3.14 “Fan Always in High Speed” Alarm............................................................................................	38
4.3.15 “Fan Failure” Alarm...........................................................................................................................	38
4.3.16 “Heater Doors Not Closed” Alarm..............................................................................................	39
4.3.17 “Heater Doors Not Opened” Alarm...........................................................................................	39
4.3.18 “Humidifier Failure” Alarm.............................................................................................................	40

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4.3.19 “In Transition - Heat Off” Alarm..................................................................................................	41
4.3.20 “Motor Drive Failure” Alarm..........................................................................................................	41
4.3.21 Power Failure (LED Indicator).......................................................................................................	42
4.3.22 “Radiant Heater Failure” Alarm...................................................................................................	42
4.3.23 “Temperature out of Calibration” Alarm.................................................................................	42
4.3.24 “Up Pedal Pressed” Alarm.............................................................................................................	43
4.4 Error Codes............................................................................................................................................................	43
4.4.1 System Failure 0...................................................................................................................................	43
4.4.2 System Failure 1...................................................................................................................................	44
4.4.3 System Failure 2...................................................................................................................................	44
4.4.4 System Failure 3...................................................................................................................................	44
4.4.5 System Failure 5...................................................................................................................................	44
4.4.6 System Failure 6...................................................................................................................................	45
4.4.7 System Failure 7...................................................................................................................................	45
4.4.8 System Failure 8...................................................................................................................................	45
4.4.9 System Failure 11................................................................................................................................	45
4.4.10 System Failure 12..............................................................................................................................	46
4.4.11 System Failure 13..............................................................................................................................	46
4.4.12 System Failure 14..............................................................................................................................	46
4.4.13 System Failure 15 .............................................................................................................................	46
4.4.14 System Failure 16 .............................................................................................................................	48
4.4.15 System Failure 17 .............................................................................................................................	48
4.4.16 System Failure 18..............................................................................................................................	48
4.4.17 System Failure 19..............................................................................................................................	49
4.4.18 System Failure 20..............................................................................................................................	49
4.4.19 System Failure 22 .............................................................................................................................	49
4.4.20 System Failure 23 .............................................................................................................................	50
4.4.21 System Failure 25..............................................................................................................................	50
4.4.22 System Failure 26..............................................................................................................................	50
4.4.23 System Failure 27..............................................................................................................................	51
4.4.24 System Failure 28..............................................................................................................................	51
4.4.25 System Failure 29..............................................................................................................................	51
4.4.26 System Failure 30..............................................................................................................................	51
4.4.27 System Failure 33..............................................................................................................................	52
4.4.28 System Failure 34..............................................................................................................................	52
4.4.29 System Failure 35..............................................................................................................................	52
4.4.30 System Failure 36 .............................................................................................................................	52
4.4.31 System Failure 37 .............................................................................................................................	53
4.4.32 System Failure 38 .............................................................................................................................	53
4.4.33 System Failure 50..............................................................................................................................	53
4.4.34 System Failure 51..............................................................................................................................	53
4.4.35 System Failure 52..............................................................................................................................	54
4.4.36 System Failure 53..............................................................................................................................	54
4.4.37 System Failure 55..............................................................................................................................	54

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4.4.38 System Failure 60 .............................................................................................................................	54
4.4.39 System Failure 98..............................................................................................................................	54
4.4.40 System Failure 99..............................................................................................................................	54
4.5 Troubleshooting Symptoms..........................................................................................................................	55
4.6 Additional Troubleshooting Tips..................................................................................................................	58
4.6.1 Raising and Lowering the Canopy or Elevating Base.........................................................	58
4.6.2 Incubator Heaters and Bed Safety Thermostat....................................................................	59
4.6.3 Radiant Heater......................................................................................................................................	59
4.6.4 Power Supplies......................................................................................................................................	59
4.6.5 Switches/Thermostat.........................................................................................................................	60
4.6.6 Humidifier Heater/Safety Thermostat.......................................................................................	61
4.6.7 Compartment Air Probe and Patient Probes..........................................................................	61
4.6.8 Heat Sink Sensor Thermistor..........................................................................................................	62
4.6.9 E-base Motor and Canopy Motor.................................................................................................	62
4.6.10 Rail Lift Belt Failure...........................................................................................................................	63
4.6.11 Troubleshooting the 50 Pin Ribbon Cable.............................................................................	64
4.6.12 Troubleshooting the Toroidal Transformer...........................................................................	64
4.6.13 Interpreting Serial Numbers.........................................................................................................	64
4.7 Servo Controlled Oxygen................................................................................................................................	65
4.7.1 Servo Controlled Oxygen Service Screen.................................................................................	65
4.7.2 Servo Controlled Oxygen Alarm Messages..............................................................................	66
4.7.3 Servo Controlled Oxygen Troubleshooting Tips.....................................................................	69
4.7.3.1 Check Supply Valves and Endcap Safety Valve.......................................................	69
4.7.3.2 Check Calibration Valve/Calibration Fan....................................................................	69
4.7.3.3 Check Cooling Fan.................................................................................................................	70
4.7.3.4 Sensor Housing Temperature Sensor Temperature to Resistance Curve...	70
Chapter 5: Repair Procedures........................................................................................	71
5.1 Canopy Removal for Replacement ...........................................................................................................	71
5.2 Servicing the Canopy Seals .........................................................................................................................	76
5.2.1 Servicing Original Canopy Seals...................................................................................................	77
5.2.2 Servicing Enhanced Canopy Seals..............................................................................................	89
5.3 Porthole Door Replacement ........................................................................................................................	90
5.4 Right Rail Assembly Repair Procedures...................................................................................................	90
5.4.1 Removing the Right Upright (Motor Side).................................................................................	90
5.4.2 Removing the Left Upright..............................................................................................................	94
5.4.3 Right Rail Internal Repairs................................................................................................................	96
5.4.3.1 Removing the Inner Rail Assembly.................................................................................	96
5.4.3.2 Replacing Rollers and Tension Springs........................................................................	97
5.4.3.3 Separating the Lift Rail from the Belt Channel.........................................................	98
5.4.3.4 Replacing the Rail Drive Belt.............................................................................................	98
5.4.3.5 Replacing the Rail Buoyancy Springs...........................................................................	99
5.4.3.6 Replacing the Slip Clutch or Motor Roll Pin..............................................................	100

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5.4.4 Reassembling the Right Upright.................................................................................................	100
5.5 Left Rail Internal Repairs...............................................................................................................................	102
5.5.1 Removing the Inner Rail Assembly............................................................................................	102
5.5.2 Replacing the Rail Buoyancy Springs.......................................................................................	103
5.5.3 Replacing Rollers, Tension Springs, and Cable Carrier Links.........................................	104
5.5.4 Reassembling the Left Upright....................................................................................................	104
5.5.5 Replacement of the Left Upright Heater Wire Harness/Cable Carrier Assembly106.
5.5.5.1 Removing and Disassembling the Rail.......................................................................	106
5.5.5.2 Removing the Old Harness Assembly from the Left Rail...................................	106
5.5.5.3 Reinstalling the New Harness on the Left Rail........................................................	108
5.5.5.4 Removing the Old Harness from the Cable Carrier Channel...........................	109
5.5.5.5 Installing the New Harness on the Cable Carrier Channel...............................	109
5.5.5.6 Reassembly.............................................................................................................................	111
5.6 Radiant Heater Assembly Repair Procedures.....................................................................................	111
5.6.1 Removing the Canopy/Heater Assembly...............................................................................	111
5.6.1.1 Realigning the Canopy.......................................................................................................	113
5.6.2 Replacing the Radiant Heater......................................................................................................	114
5.6.3 Heater Door Spool Assembly.......................................................................................................	116
5.6.4 Heater Door Cable Adjustment...................................................................................................	117
5.6.5 Spring Tube Assembly Replacement........................................................................................	118
5.7 Compartment Air Probe Repairs ..............................................................................................................	121
5.8 Removing the Upper End Cap Spring ....................................................................................................	122
5.9 Lower Unit Repairs..........................................................................................................................................	123
5.9.1 Removing the Chassis Cover with the Storage Drawer in Place.................................	123
5.9.2 Incubator Fan, Fan Motor, and Optical Fan Sensor...........................................................	124
5.9.3 Incubator Heater Replacement..................................................................................................	126
5.9.3.1 To Remove the Incubator Heater Closest to the Foot of the Bed..................	127
5.9.3.2 To Remove the Incubator Heater Closest to the Head of the Bed................	127
5.9.4 Elevating Base.....................................................................................................................................	128
5.9.5 Chassis Replacement.......................................................................................................................	129
5.9.6 Bed Up/Down Pedal Switch..........................................................................................................	130
5.9.7 Canopy Pedal Switch......................................................................................................................	130
5.9.8 Canopy Membrane Switch Replacement...............................................................................	130
5.10 Bed Tilt Brake Pad Replacement ...........................................................................................................	132
5.11 Caster Replacement ...................................................................................................................................	133
5.12 Humidifier Assembly Repairs...................................................................................................................	133
5.12.1 Tips for Repairing an Old Style Unit........................................................................................	134
5.12.2 Disassembly.......................................................................................................................................	134
5.12.3 Reassembly........................................................................................................................................	136
5.13 Controller and Display Module Procedures.......................................................................................	137
5.13.1 Display Module.................................................................................................................................	137
5.13.2 Probe Panel........................................................................................................................................	138

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Table of Contents

5.13.2.1 Battery....................................................................................................................................	139
5.13.3 Controller Components................................................................................................................	140
5.13.3.1 Control Board......................................................................................................................	141
5.13.3.2 Relay Board..........................................................................................................................	141
5.13.3.3 Solid State Relays..............................................................................................................	141
5.13.3.4 Power Supply.......................................................................................................................	141
5.13.3.5 Toroidal Transformer.......................................................................................................	142
5.13.3.6 Canopy Lift Motor, ISO Transformer, Circuit Breakers, Power Switches, and
Power Outlets...................................................................................................................	142
5.14 Servo Controlled Oxygen Service Procedures..................................................................................	143
5.14.1 Installing Oxygen Sensors...........................................................................................................	143
5.14.2 Replacing the Vent Screen..........................................................................................................	143
5.14.3 Sensor Housing Repairs...............................................................................................................	144
5.14.3.1 Sensor Housing Repairs: Boards, Calibration Fan Assembly, and Sensor
Plug Assembly..................................................................................................................	144
5.14.3.2 Sensor Housing Repairs: Calibration Valve............................................................	145
5.14.4 Valve Housing Repairs..................................................................................................................	146
5.14.4.1 Valve Housing Repairs: Regulator Assembly........................................................	146
5.14.4.2 Valve Housing Repairs: Supply Valves ....................................................................	147
5.14.5 Endcap Safety Valve......................................................................................................................	147
5.14.6 Servo Oxygen Board Repairs.....................................................................................................	148
Chapter 6: Illustrated Parts.........................................................................................	149
6.1 Exploded Views.................................................................................................................................................	149
6.1.1 Probe Housing, Display Module, and Electrical Enclosure..............................................	150
6.1.2 Bed and Side Panels.........................................................................................................................	158
6.1.3 Radiant Heater and Canopy.........................................................................................................	164
6.1.4 Chassis....................................................................................................................................................	172
6.1.5 Humidifier..............................................................................................................................................	176
6.1.6 Elevating Base.....................................................................................................................................	178
6.1.7 Uprights and Lift Rail Components............................................................................................	180
6.1.8 Compartment Air Probe .................................................................................................................	192
6.1.9 Servo Control Oxygen......................................................................................................................	194
6.1.10 Storage Drawer................................................................................................................................	202
6.2 Accessories.........................................................................................................................................................	211
6.3 Labels.....................................................................................................................................................................	212
6.4 PCB Layouts........................................................................................................................................................	217
6.5 Wiring Diagrams...............................................................................................................................................	221
Appendix A: Compartment and Skin Probe Characteristics..................................	233
Appendix B: Specifications...........................................................................................	235
B.1 Power Requirements......................................................................................................................................	235

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	Table of Contents
B.2 Accessory Outlets............................................................................................................................................	235
B.3 Standards............................................................................................................................................................	235
B.4 Operating Environment.................................................................................................................................	236
B.5 Storage Conditions..........................................................................................................................................	236
B.6 User Control Settings.....................................................................................................................................	236
B.7 Alarms...................................................................................................................................................................	236
B.8 Performance......................................................................................................................................................	237
B.8.1 System....................................................................................................................................................	237
B.8.2 Humidity.................................................................................................................................................	237
B.8.3 Servo Control Oxygen......................................................................................................................	237
B.9 Weight Scale......................................................................................................................................................	238
B.10 Mechanical Specifications........................................................................................................................	238
B.10.1 Accessories........................................................................................................................................	238
Appendix C: RS-232 Serial Data...................................................................................	239
C.1 RS-232 Connector...........................................................................................................................................	239
C.2 Data Stream.......................................................................................................................................................	239
C.3 Nurse Call............................................................................................................................................................	240

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Table of Contents

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List of Figures

Figure 1-1 Block Diagram.........................................................................................................................................	2
Figure 1-2 Humidifier..................................................................................................................................................	9
Figure 2-1 Connections and Controls..............................................................................................................	18
Figure 3-1 Control Board Test Points................................................................................................................	22
Figure 4-1 First Service Screen............................................................................................................................	30
Figure 4-2 Second Service Screen.....................................................................................................................	31
Figure 4-3 Status Menu..........................................................................................................................................	31
Figure 4-4 Switch Diagnostic Diagram............................................................................................................	32
Figure 4-5 Pedal Screen..........................................................................................................................................	32
Figure 4-6 Service Screen......................................................................................................................................	33
Figure 4-7 Servo Controlled Oxygen Service Screen................................................................................	65
Figure 5-1 Heater Housing Cover and Soffit.................................................................................................	72
Figure 5-2 Original Seal Parts..............................................................................................................................	73
Figure 5-3 Nuts...........................................................................................................................................................	73
Figure 5-4 Access Holes.........................................................................................................................................	74
Figure 5-5 Canopy, Bracket, and Heater Housing.....................................................................................	74
Figure 5-6 Two People Needed for this Step.................................................................................................	75
Figure 5-7 Canopy Seals and Extrusions........................................................................................................	76
Figure 5-8 Wedging a Blunt Object to Keep Seal Open...........................................................................	77
Figure 5-9 Enhanced Seal Parts.........................................................................................................................	78
Figure 5-10 West Side Seal Parts.......................................................................................................................	79
Figure 5-11 Using North Seal to Help Position Washers.........................................................................	79
Figure 5-12 Seal Cross-section...........................................................................................................................	80
Figure 5-13 North Seal Parts................................................................................................................................	81
Figure 5-14 Beveled Side of North Spacer Toward Canopy..................................................................	81
Figure 5-15 Hole Fill Assembly (2x) for Canopies with Six Holes across North End....................	82
Figure 5-16 South Seal Parts................................................................................................................................	83
Figure 5-17 South Corner Parts..........................................................................................................................	84
Figure 5-18 North Corner Parts..........................................................................................................................	84
Figure 5-19 Installing Rail Spacers....................................................................................................................	85
Figure 5-21 Soffit........................................................................................................................................................	87

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List of Figures

Figure 5-22 Trimming the Soffit..........................................................................................................................	87
Figure 5-23 Untrimmed and Trimmed Soffit.................................................................................................	88
Figure 5-24 Disconnecting Heater Door Cable............................................................................................	91
Figure 5-25 Upright Decorative Strips, End Caps, and Wire Covers..................................................	92
Figure 5-26 Removing the Lift Motor................................................................................................................	93
Figure 5-27 Display Module Disassembly......................................................................................................	93
Figure 5-28 Right Upright Disassembly..........................................................................................................	96
Figure 5-29 Rollers and Tensioning Spring....................................................................................................	97
Figure 5-30 Replacing the Drive Belt................................................................................................................	98
Figure 5-31 Replacing the Rail Buoyancy Springs.....................................................................................	99
Figure 5-32 Left Inner Rail...................................................................................................................................	102
Figure 5-33 Left Rail Springs and Spools......................................................................................................	103
Figure 5-34 Re-attaching the Upright............................................................................................................	104
Figure 5-35 Cable Guard Latch.........................................................................................................................	107
Figure 5-36 3-pin MAT-N-LOK Connector and Bushing.........................................................................	107
Figure 5-37 Cable Tie.............................................................................................................................................	108
Figure 5-38 Connector Drawing.......................................................................................................................	109
Figure 5-39 Opened Cable Guard Latches..................................................................................................	109
Figure 5-40 Correct and Incorrect Cable Tie Usage................................................................................	110
Figure 5-41 Lift Rail and Cable Carrier Channel Together ...................................................................	110
Figure 5-42 Canopy Alignment.........................................................................................................................	112
Figure 5-43 Radiant Heater Disassembly....................................................................................................	114
Figure 5-44 Heater Door Cable Adjustment...............................................................................................	116
Figure 5-45 Securing String to the Spring Tube........................................................................................	118
Figure 5-46 Removal of the Lower M5 Nut..................................................................................................	119
Figure 5-47 Dog Point of the Set Screw........................................................................................................	120
Figure 5-48 Compartment Air Probe Disassembly..................................................................................	121
Figure 5-49 Top Rail End Cap.............................................................................................................................	122
Figure 5-50 Bed Disassembly............................................................................................................................	124
Figure 5-51 Heat Sink and Fan..........................................................................................................................	125
Figure 5-52 Fan Motor...........................................................................................................................................	125
Figure 5-53 Elevating Base.................................................................................................................................	126
Figure 5-54 Chassis Bottom Cover..................................................................................................................	129
Figure 5-55 Replacing the Tilt Brake Pad.....................................................................................................	132
Figure 5-56 Humidifier Parts..............................................................................................................................	135
Figure 5-57 Display Module................................................................................................................................	137
Figure 5-58 Probe Panel.......................................................................................................................................	138

xii

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	List of Figures

Figure 5-59 Electronics Enclosure...................................................................................................................	140
Figure 5-60 Installing Sensors...........................................................................................................................	143
Figure 5-61 Sensor Housing...............................................................................................................................	144
Figure 5-62 Valve Housing..................................................................................................................................	146
Figure 5-63 Endcap Safety Valve.....................................................................................................................	147
Figure 6-1 Probe Panel Assembly....................................................................................................................	151
Figure 6-2 Display Module...................................................................................................................................	153
Figure 6-3 Electrical Enclosure..........................................................................................................................	155
Figure 6-4 Humidifier Transformer and RS232 Option..........................................................................	157
Figure 6-5 Bed ..........................................................................................................................................................	159
Figure 6-6 Side Panel (East/West)....................................................................................................................	161
Figure 6-7 Rear (North) and Front (South) Wall..........................................................................................	163
Figure 6-8 Radiant Heater...................................................................................................................................	165
Figure 6-9 Canopy ..................................................................................................................................................	167
Figure 6-10 Original Canopy Seal Parts........................................................................................................	168
Figure 6-11 Enhanced Canopy Seal Parts...................................................................................................	169
Figure 6-12 Heater Doors ...................................................................................................................................	171
Figure 6-13 Upper Chassis .................................................................................................................................	173
Figure 6-14 Lower Chassis .................................................................................................................................	175
Figure 6-15 Humidifier Assembly.....................................................................................................................	177
Figure 6-16 Base and Elevating Column......................................................................................................	179
Figure 6-17 Right (East) Upright Parts, Motor Side (Complete East Rail Assembly: 6600-0290-850)
181
Figure 6-18 Belt Channel - 1 (Lift Motor Side).............................................................................................	183
Figure 6-19 Belt Channel - 2 (Lift Motor Side).............................................................................................	185
Figure 6-20 Lift Rail (Both Sides).......................................................................................................................	187
Figure 6-21 Rail End Caps ..................................................................................................................................	189
Figure 6-22 Left (West) Upright (Complete West Rail Assembly: 6600-0290-851)....................	191
Figure 6-23 Compartment Air Probe..............................................................................................................	193
Figure 6-24 Servo Control Oxygen Sensor Housing Assembly (Servo O2 Upgrade Kit 6600-0678-800)
195
Figure 6-25 Servo Control Oxygen Valve Housing ..................................................................................	197
Figure 6-26 Expansion Chamber/Heatsink Vent......................................................................................	198
Figure 6-27 Servo Control Oxygen Cooling Fan........................................................................................	199
Figure 6-28 Servo Control Oxygen PC Board..............................................................................................	200
Figure 6-29 Manifold Endcap Safety Valve..................................................................................................	201
Figure 6-30 Storage Drawer ..............................................................................................................................	202

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List of Figures

Figure 6-31 Instrument Shelf (6600-0865-700).........................................................................................	203
Figure 6-32 Monitor Shelf (6600-0824-800)................................................................................................	204
Figure 6-33 E-Cylinder Holder (6600-0836-800).......................................................................................	205
Figure 6-34 Tubing Management Arm (6600-0837-800)......................................................................	206
Figure 6-35 Dovetail Mount DIN Rail (6600-0659-803) .........................................................................	207
Figure 6-36 Silo Support Assembly (6600-0853-800).............................................................................	208
Figure 6-37 Rotating I.V. Pole Assembly (6600-0851-800)....................................................................	209
Figure 6-38 Dovetail Extension (6600-0852-800) ....................................................................................	210
Figure 6-39 Control Board (6600-0212-850)...............................................................................................	217
Figure 6-40 Display Driver Board (6600-0213-850).................................................................................	218
Figure 6-41 Relay Board (6600-0214-850) Revision Level 10 or Higher........................................	219
Figure 6-42 Relay Board (6600-0214-850) Revision Level 9 or Lower............................................	220
Figure 6-43 Wiring Diagram: Control Board...............................................................................................	221
Figure 6-44 Wiring Diagram: Elevating Base and Canopy Lift Rails................................................	222
Figure 6-45 Wiring Diagram: Electrical Enclosure ..................................................................................	223
Figure 6-46 Wiring Diagram: Graphics Display.........................................................................................	224
Figure 6-47 Wiring Diagram: Incubator Relay Board Rev 10 or Higher ........................................	225
Figure 6-48 Wiring Diagram: Incubator Relay Board 9 or Lower .....................................................	226
Figure 6-49 Wiring Diagram: Radiant Heater Relay Board 10 or Higher......................................	227
Figure 6-50 Wiring Diagram: Radiant Heater Relay Board 9 or Lower .........................................	228
Figure 6-51 Wiring Diagram: Servo Humidifier Relay Board 10 or Higher ..................................	229
Figure 6-52 Wiring Diagram: Servo Humidifier Relay Board 9 or Lower ......................................	230
Figure 6-53 Wiring Diagram: Servo Control Oxygen...............................................................................	231

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About this Manual

Scope and Intended Users

This service manual describes the repair and maintenance of the Giraffe OmniBed.

The intended users for this service manual are authorized service personnel.

Conventions

Various types of pictures or icons are used in this service manual wherever they reinforce the printed message to alert you to potential safety hazards in one of the following ways:

WARNING:

A WARNING statement is used when the possibility of injury to the patient or the operator exists.

CAUTION:

A CAUTION statement is used when the possibility of damage to the equipment exists.

SENSITIVE TO ELECTROSTATIC DISCHARGE CAUTION

An Electrostatic Discharge (ESD) Susceptibility symbol is displayed to alert service personnel that the part(s) are sensitive to electrostatic discharge and that static control procedures must be used to prevent damage to the equipment.

NOTE: A note provides additional information to clarify a point in the text.

IMPORTANT: An Important statement is similar to a note, but is used for greater emphasis.

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About this Manual

References

The following table lists the part numbers for the manual kit in each language containing the Giraffe OmniBed Operation and Maintenance Manual and other documents pertaining to Giraffe OmniBed:

Language	Manual Kit
Czech	M1141763
Danish	6600-0835-817
Dutch	6600-0835-810
English UK	6600-0835-812
English US	6600-0835-801
Estonian	M1141752
French	6600-0835-802
German	6600-0835-804
Italian	6600-0835-805

Language	Manual Kit
Japanese	6600-0835-807
Korean	M1141805
Norwegian	6600-0835-818
Polish	M1141760
Romanian	M1141768
Russian	M1141766
Spanish	6600-0835-803
Swedish	6600-0835-806
Turkish	M1141750

Symbol Definitions

This section identifies the symbols that are displayed on the Giraffe OmniBed:

Symbol Description

37 c	Temperature Alarm
	Heater

Airflow Curtain

Fan

Canopy Up/Down (used in conjunction with up/down arrows)

Environmental Probe

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Symbol Description

	Scale
2	Patient Oxygen
2

Alarm Silence

Patient

Protective Ground

Opening Giraffe Humidifier Reservoir

MAX	Maximum Water Level for Humidifier
	Maximum Water Level for Humidifier
	Power Disconnect
22 Kg	Maximum Weight
MAX.
	Caution: Hot Surface
	Setup Screen

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User Responsibility

This Product will perform in conformity with the description thereof contained in this service manual and accompanying labels and/or inserts, when assembled, operated, maintained and repaired in accordance with the instructions provided. This Product must be checked periodically. A defective Product should not be used. Parts that are broken, missing, plainly worn, distorted or contaminated should be replaced immediately. Should such repair or replacement become necessary, GE Healthcare recommends that a telephone or written request for service advice be made to the nearest GE Healthcare Regional Service Center. This Product or any of its parts should not be repaired other than in accordance with written instructions provided by GE Healthcare and by GE Healthcare trained personnel. The Product must not be altered without GE Healthcare’s prior written approval. The user of this Product shall have the sole responsibility for any malfunction that results from improper use, faulty maintenance, improper repair, damage or alteration by anyone other than GE Healthcare..

Important

The information contained in this service manual pertains only to those models of products which are marketed by GE Healthcare as of the effective date of this manual or the latest revision thereof. This service manual was prepared for exclusive use by GE Healthcare service personnel in light of their training and experience as well as the availability to them of parts, proper tools and test equipment. Consequently, GE Healthcare provides this service manual to its customers purely as a business convenience and for the customer’s general information only without warranty of the results with respect to any application of such information.

Furthermore, because of the wide variety of circumstances under which maintenance and repair activities may be performed and the unique nature of each individual’s own experience, capacity, and qualifications, the fact that a customer has received such information from GE Healthcare does not imply in anyway that GE Healthcare deems said individual to be qualified to perform any such maintenance or repair service.

Moreover, it should not be assumed that every acceptable test and safety procedure or method, precaution, tool, equipment or device is referred to within, or that abnormal or unusual circumstances, may not warrant or suggest different or additional procedures or requirements.

This manual is subject to periodic review, update and revision. Customers are cautioned to obtain and consult the latest revision before undertaking any service of the equipment.

CAUTION:

Servicing of this product in accordance with this service manual should never be undertaken in the absence of proper tools, test equipment and the most recent revision to this service manual which is clearly and thoroughly understood.

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Technical Competence

The procedures described in this service manual should be performed by trained and authorized personnel only. Maintenance should only be undertaken by competent individuals who have a general knowledge of and experience with devices of this nature. No repairs should ever be undertaken or attempted by anyone not having such qualifications. Genuine replacement parts manufactured or sold by GE Healthcare must be used for all repairs. Read completely through each step in every procedure before starting the procedure; any exceptions may result in a failure to properly and safely complete the attempted procedure.

Warnings

WARNING:

Before using the OmniBed, read through this entire manual. As with all medical equipment, attempting to use this device without a thorough understanding of its operation may result in patient or user injury. This device should only be operated by personnel trained in its operation under the direction of qualified medical personnel familiar with the risks and benefits of this type of device. Additional precautions specific to certain procedures are found in the text of this manual.

WARNING:

Complete the Pre-use Checkout chapter of the Operation and Maintenance manual before putting the unit into operation. If the incubator fails any portion of the checkout procedure it must be removed from use and repaired.

WARNING:

Do not use the OmniBed in the presence of flammable anesthetics; an explosion hazard exists under these conditions.

WARNING:

Always disconnect the power before performing service or maintenance procedures detailed in this manual. Apply power only if you are specifically instructed to do so as part of the procedure.

WARNING:

Thoroughly air dry the incubator after cleaning it with flammable agents. Small amounts of flammable agents, such as ether, alcohol or similar cleaning solvents left in the incubator can cause a fire.

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Cautions

CAUTION:

Only competent individuals trained in the repair of this equipment should attempt to service it as detailed in this manual.

CAUTION:

Detailed information for more extensive repairs is included in the service manual solely for the convenience of users having proper knowledge, tools and test equipment, and for service representatives trained by GE Healthcare.

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	About this Manual


	ПРЕДУПРЕЖДЕНИЕ
	Това упътване за работа е налично само на английски език.
(BG)	• Ако доставчикът на услугата на клиента изиска друг език, задължение на клиента е да
	осигури превод.
	• Не използвайте оборудването, преди да сте се консултирали и разбрали упътването за
	работа.
	• Неспазването на това предупреждение може да доведе до нараняване на доставчика на
	услугата, оператора или пациентa в резултат на токов удар, механична или друга опасност.

本维修手册仅提供英文版本。

(ZH-CN) •

本服務手冊僅提供英文版本。

(ZH-HK) •

本維修手冊僅有英文版。

(ZH-TW) •

	UPOZORENJE
	Ovaj servisni priručnik dostupan je na engleskom jeziku.
(HR)	• Ako davatelj usluge klijenta treba neki drugi jezik, klijent je dužan osigurati prijevod.
	• Ne pokušavajte servisirati opremu ako niste u potpunosti pročitali i razumjeli ovaj servisni
	priručnik.
	• Zanemarite li ovo upozorenje, može doći do ozljede davatelja usluge, operatera ili pacijenta
	uslijed strujnog udara, mehaničkih ili drugih rizika.

	VÝSTRAHA
	Tento provozní návod existuje pouze v anglickém jazyce.
(CS)	• V případě, že externí služba zákazníkům potřebuje návod v jiném jazyce, je zajištění překladu do
	odpovídajícího jazyka úkolem zákazníka.
	• Nesnažte se o údržbu tohoto zařízení, aniž byste si přečetli tento provozní návod a pochopili
	jeho obsah.
	• V případě nedodržování této výstrahy může dojít k poranění pracovníka prodejního servisu,
	obslužného personálu nebo pacientů vlivem elektrického proudu, respektive vlivem
	mechanických či jiných rizik.

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	ADVARSEL
	Denne servicemanual findes kun på engelsk.
(DA)	• Hvis en kundes tekniker har brug for et andet sprog end engelsk, er det kundens ansvar at
	sørge for oversættelse.
	• Forsøg ikke at servicere udstyret uden at læse og forstå denne servicemanual.
	• Manglende overholdelse af denne advarsel kan medføre skade på grund af elektrisk stød,
	mekanisk eller anden fare for teknikeren, operatøren eller patienten.

	WAARSCHUWING
	Deze onderhoudshandleiding is enkel in het Engels verkrijgbaar.
(NL)	• Als het onderhoudspersoneel een andere taal vereist, dan is de klant verantwoordelijk voor de
	vertaling ervan.
	• Probeer de apparatuur niet te onderhouden alvorens deze onderhoudshandleiding werd
	geraadpleegd en begrepen is.
	• Indien deze waarschuwing niet wordt opgevolgd, zou het onderhoudspersoneel, de operator
	of een patiënt gewond kunnen raken als gevolg van een elektrische schok, mechanische of
	andere gevaren.

	WARNING:
	This service manual is available in English only.
(EN)	• If a customer’s service provider requires a language other than English, it is the customer’s
	responsibility to provide translation services.
	• Do not attempt to service the equipment unless this service manual has been consulted and is
	understood.
	• Failure to heed this warning may result in injury to the service provider, operator, or patient from
	electric shock, mechanical hazards, or other hazards.

	HOIATUS
	See teenindusjuhend on saadaval ainult inglise keeles
(ET)	• Kui klienditeeninduse osutaja nõuab juhendit inglise keelest erinevas keeles, vastutab klient
	tõlketeenuse osutamise eest.
	• Ärge üritage seadmeid teenindada enne eelnevalt käesoleva teenindusjuhendiga tutvumist ja
	sellest aru saamist.
	• Käesoleva hoiatuse eiramine võib põhjustada teenuseosutaja, operaatori või patsiendi
	vigastamist elektrilöögi, mehaanilise või muu ohu tagajärjel.

	VAROITUS
	Tämä huolto-ohje on saatavilla vain englanniksi.
(FI)	• Jos asiakkaan huoltohenkilöstö vaatii muuta kuin englanninkielistä materiaalia, tarvittavan
	käännöksen hankkiminen on asiakkaan vastuulla.
	• Älä yritä korjata laitteistoa ennen kuin olet varmasti lukenut ja ymmärtänyt tämän huolto-
	ohjeen.
	• Mikäli tätä varoitusta ei noudateta, seurauksena voi olla huoltohenkilöstön, laitteiston käyttäjän
	tai potilaan vahingoittuminen sähköiskun, mekaanisen vian tai muun vaaratilanteen vuoksi.

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	ATTENTION
	Ce manuel d’installation et de maintenance est disponible uniquement en anglais.
(FR)	• Si le technicien d’un client a besoin de ce manuel dans une langue autre que l’anglais, il
	incombe au client de le faire traduire.
	• Ne pas tenter d’intervenir sur les équipements tant que ce manuel d’installation et de
	maintenance n’a pas été consulté et compris.
	• Le non-respect de cet avertissement peut entraîner chez le technicien, l’opérateur ou le patient
	des blessures dues à des dangers électriques, mécaniques ou autres.

	WARNUNG
	Diese Serviceanleitung existiert nur in englischer Sprache.
(DE)	• Falls ein fremder Kundendienst eine andere Sprache benötigt, ist es Aufgabe des Kunden für
	eine entsprechende Übersetzung zu sorgen.
	• Versuchen Sie nicht diese Anlage zu warten, ohne diese Serviceanleitung gelesen und
	verstanden zu haben.
	• Wird diese Warnung nicht beachtet, so kann es zu Verletzungen des Kundendiensttechnikers,
	des Bedieners oder des Patienten durch Stromschläge, mechanische oder sonstige Gefahren
	kommen.

	ΠΡΟΕΙΔΟΠΟΙΗΣΗ
	Το παρόν εγχειρίδιο σέρβις διατίθεται μόνο στα αγγλικά.
(EL)	• Εάν ο τεχνικός σέρβις ενός πελάτη απαιτεί το παρόν εγχειρίδιο σε γλώσσα εκτός των
	αγγλικών, αποτελεί ευθύνη του πελάτη να παρέχει τις υπηρεσίες μετάφρασης.
	• Μην επιχειρήσετε την εκτέλεση εργασιών σέρβις στον εξοπλισμό αν δεν έχετε συμβουλευτεί
	και κατανοήσει το παρόν εγχειρίδιο σέρβις.
	• Αν δεν προσέξετε την προειδοποίηση αυτή, ενδέχεται να προκληθεί τραυματισμός στον
	τεχνικό σέρβις, στο χειριστή ή στον ασθενή από ηλεκτροπληξία, μηχανικούς ή άλλους
	κινδύνους.

	FIGYELMEZTETÉS
	Ezen karbantartási kézikönyv kizárólag angol nyelven érhető el.
(HU)	• Ha a vevő szolgáltatója angoltól eltérő nyelvre tart igényt, akkor a vevő felelőssége a fordítás
	elkészíttetése.
	• Ne próbálja elkezdeni használni a berendezést, amíg a karbantartási kézikönyvben leírtakat
	nem értelmezték.
	• Ezen figyelmeztetés figyelmen kívül hagyása a szolgáltató, működtető vagy a beteg áramütés,
	mechanikai vagy egyéb veszélyhelyzet miatti sérülését eredményezheti.

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	AÐVÖRUN
	Þessi þjónustuhandbók er aðeins fáanleg á ensku.
(IS)	• Ef að þjónustuveitandi viðskiptamanns þarfnast annas tungumáls en ensku, er það skylda
	viðskiptamanns að skaffa tungumálaþjónustu.
	• Reynið ekki að afgreiða tækið nema að þessi þjónustuhandbók hefur verið skoðuð og skilin.
	• Brot á sinna þessari aðvörun getur leitt til meiðsla á þjónustuveitanda, stjórnanda eða sjúklings
	frá raflosti, vélrænu eða öðrum áhættum.

	AVVERTENZA
	Il presente manuale di manutenzione è disponibile soltanto in lingua inglese.
(IT)	•	Se un addetto alla manutenzione richiede il manuale in una lingua diversa, il cliente è tenuto a
		provvedere direttamente alla traduzione.
	•	Procedere alla manutenzione dell’apparecchiatura solo dopo aver consultato il presente
		manuale ed averne compreso il contenuto.
	•	Il mancato rispetto della presente avvertenza potrebbe causare lesioni all’addetto alla
		manutenzione, all’operatore o ai pazienti provocate da scosse elettriche, urti meccanici o altri
		rischi.



(JA)	•

	•
	•

(KO) • ,.

• 마십시오.

•, ,, .

	BRĪDINĀJUMS
	Šī apkopes rokasgrāmata ir pieejama tikai angļu valodā.
(LV)	• Ja klienta apkopes sniedzējam nepieciešama informācija citā valodā, klienta pienākums ir
	nodrošināt tulkojumu.
	• Neveiciet aprīkojuma apkopi bez apkopes rokasgrāmatas izlasīšanas un saprašanas.
	• Šī brīdinājuma neievērošanas rezultātā var rasties elektriskās strāvas trieciena, mehānisku vai
	citu faktoru izraisītu traumu risks apkopes sniedzējam, operatoram vai pacientam.

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	ĮSPĖJIMAS
	Šis eksploatavimo vadovas yra tik anglų kalba.
(LT)	• Jei kliento paslaugų tiekėjas reikalauja vadovo kita kalba – ne anglų, suteikti vertimo paslaugas
	privalo klientas.
	• Nemėginkite atlikti įrangos techninės priežiūros, jei neperskaitėte ar nesupratote šio
	eksploatavimo vadovo.
	• Jei nepaisysite šio įspėjimo, galimi paslaugų tiekėjo, operatoriaus ar paciento sužalojimai dėl
	elektros šoko, mechaninių ar kitų pavojų.

	ADVARSEL
	Denne servicehåndboken finnes bare på engelsk.
(NO)	• Hvis kundens serviceleverandør har bruk for et annet språk, er det kundens ansvar å sørge for
	oversettelse.
	• Ikke forsøk å reparere utstyret uten at denne servicehåndboken er lest og forstått.
	• Manglende hensyn til denne advarselen kan føre til at serviceleverandøren, operatøren eller
	pasienten skades på grunn av elektrisk støt, mekaniske eller andre farer.

	OSTRZEŻENIE
	Niniejszy podręcznik serwisowy dostępny jest jedynie w języku angielskim.
(PL)	• Jeśli serwisant klienta wymaga języka innego niż angielski, zapewnienie usługi tłumaczenia jest
	obowiązkiem klienta.
	• Nie próbować serwisować urządzenia bez zapoznania się z niniejszym podręcznikiem
	serwisowym i zrozumienia go.
	• Niezastosowanie się do tego ostrzeżenia może doprowadzić do obrażeń serwisanta, operatora
	lub pacjenta w wyniku porażenia prądem elektrycznym, zagrożenia mechanicznego bądź
	innego.

AVISO

Este manual de assistência técnica encontra-se disponível unicamente em inglês.

(PT-BR) • Se outro serviço de assistência técnica solicitar a tradução deste manual, caberá ao cliente fornecer os serviços de tradução.

•Não tente reparar o equipamento sem ter consultado e compreendido este manual de assistência técnica.

•A não observância deste aviso pode ocasionar ferimentos no técnico, operador ou paciente decorrentes de choques elétricos, mecânicos ou outros.

ATENÇÃO

Este manual de assistência técnica só se encontra disponível em inglês.

(PT-PT) • Se qualquer outro serviço de assistência técnica solicitar este manual noutro idioma, é da responsabilidade do cliente fornecer os serviços de tradução.

•Não tente reparar o equipamento sem ter consultado e compreendido este manual de assistência técnica.

•O não cumprimento deste aviso pode colocar em perigo a segurança do técnico, do operador ou do paciente devido a choques eléctricos, mecânicos ou outros.

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	ATENŢIE
	Acest manual de service este disponibil doar în limba engleză.
(RO)	• Dacă un furnizor de servicii pentru clienţi necesită o altă limbă decât cea engleză, este de
	datoria clientului să furnizeze o traducere.
	• Nu încercaţi să reparaţi echipamentul decât ulterior consultării şi înţelegerii acestui manual de
	service.
	• Ignorarea acestui avertisment ar putea duce la rănirea depanatorului, operatorului sau
	pacientului în urma pericolelor de electrocutare, mecanice sau de altă natură.

	ОСТОРОЖНО!

Данное руководство по техническому обслуживанию представлено только на английском (RU) языке.

•Если сервисному персоналу клиента необходимо руководство не на английском, а на каком-то другом языке, клиенту следует самостоятельно обеспечить перевод.

•Перед техническим обслуживанием оборудования обязательно обратитесь к данному руководству и поймите изложенные в нем сведения.

•Несоблюдение требований данного предупреждения может привести к тому, что специалист по техобслуживанию, оператор или пациент получит удар электрическим током, механическую травму или другое повреждение.

	UPOZORENJE
	Ovo servisno uputstvo je dostupno samo na engleskom jeziku.
(SR)	• Ako klijentov serviser zahteva neki drugi jezik, klijent je dužan da obezbedi prevodilačke usluge.
	• Ne pokušavajte da opravite uređaj ako niste pročitali i razumeli ovo servisno uputstvo.
	• Zanemarivanje ovog upozorenja može dovesti do povređivanja servisera, rukovaoca ili
	pacijenta usled strujnog udara ili mehaničkih i drugih opasnosti.

	UPOZORNENIE
	Tento návod na obsluhu je k dispozícii len v angličtine.
(SK)	• Ak zákazníkov poskytovateľ služieb vyžaduje iný jazyk ako angličtinu, poskytnutie
	prekladateľských služieb je zodpovednosťou zákazníka.
	• Nepokúšajte sa o obsluhu zariadenia, kým si neprečítate návod na obluhu a neporozumiete mu.
	• Zanedbanie tohto upozornenia môže spôsobiť zranenie poskytovateľa služieb, obsluhujúcej
	osoby alebo pacienta elektrickým prúdom, mechanické alebo iné ohrozenie.

	ATENCION
	Este manual de servicio sólo existe en inglés.
(ES)	• Si el encargado de mantenimiento de un cliente necesita un idioma que no sea el inglés, el
	cliente deberá encargarse de la traducción del manual.
	• No se deberá dar servicio técnico al equipo, sin haber consultado y comprendido este manual
	de servicio.
	• La no observancia del presente aviso puede dar lugar a que el proveedor de servicios, el
	operador o el paciente sufran lesiones provocadas por causas eléctricas, mecánicas o de otra
	naturaleza.

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	VARNING
	Den här servicehandboken finns bara tillgänglig på engelska.
(SV)	• Om en kunds servicetekniker har behov av ett annat språk än engelska, ansvarar kunden för att
	tillhandahålla översättningstjänster.
	• Försök inte utföra service på utrustningen om du inte har läst och förstår den här
	servicehandboken.
	• Om du inte tar hänsyn till den här varningen kan det resultera i skador på serviceteknikern,
	operatören eller patienten till följd av elektriska stötar, mekaniska faror eller andra faror.

	OPOZORILO
	Ta servisni priročnik je na voljo samo v angleškem jeziku.·
(SL)	• Če ponudnik storitve stranke potrebuje priročnik v drugem jeziku, mora stranka zagotoviti
	prevod.·
	• Ne poskušajte servisirati opreme, če tega priročnika niste v celoti prebrali in razumeli.·
	• Če tega opozorila ne upoštevate, se lahko zaradi električnega udara, mehanskih ali drugih
	nevarnosti poškoduje ponudnik storitev, operater ali bolnik.

	DİKKAT
	Bu servis kılavuzunun sadece ingilizcesi mevcuttur.
(TR)	• Eğer müşteri teknisyeni bu kılavuzu ingilizce dışında bir başka lisandan talep ederse, bunu
	tercüme ettirmek müşteriye düşer.
	• Servis kılavuzunu okuyup anlamadan ekipmanlara müdahale etmeyiniz.
	• Bu uyarıya uyulmaması, elektrik, mekanik veya diğer tehlikelerden dolayı teknisyen, operatör
	veya hastanın yaralanmasına yol açabilir.

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Chapter 1: Functional Description

This chapter provides a functional description for the Giraffe OmniBed, including sections representing each of the four boards. Refer to “Figure 1-1 Block Diagram” and section “6.5 Wiring Diagrams” when studying this chapter.

1.1 Control Board

The Intel 80C188EC microcontroller is an enhanced X86 processor with many on-board peripheral features, such as a interrupt controller, DMA controller, peripheral chip select driver, programmable timers, etc. The two programmable timers are used to control the two heaters (bed and radiant). The input to these timers is line frequency. This allows the control signal to be synchronized with the line frequency to better control the zerocrossing solid state relays. The on-board interrupt controller has several interrupts: analog-to-digital converter (ADC) conversion ready signal, overtemperature comparator output, watchdog output, power fail signal, and module interrupt signal from the system data bus. The microcontroller external bus is a multiplexed address and data bus.

The system memory consists of a programmable read-only memory (PROM) and static random access memory (SRAM). The EEPROM is used for calibration and biomedical configuration values. This memory holds the data even after power is turned off.

The RS-485 integrated circuit converts the RS-232 TTL signals from the microcontroller to RS-485 signals for the bus. This bus is the main communications bus from the control board to the display board, scale, and servo oxygen board.

There are two isolation transceivers used to isolate the circuits powered by +5V and the circuits powered by +5VSTBY (battery backup).

The board contains a 16 channel multiplexer. There are seven temperature measurement channels. These channels measure the two patient probes and the compartment probe (with two thermistors each), and the heat sink sensor used to measure the heat sink temperature. Additional channels include the humidity sensor (RHIN), LINE COMP & LINE COMP2, 5 Volts, Motor current, Vthref, VDAC, and 1.2Vind.

Attached to the compartment probe connection is the relative humidity signal conditioning circuitry. The 1V reference that is used for the analog circuitry is also the maximum input voltage and the offset voltage for the ADC. This yields a purely ratiometric system.

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	Microprocessor	Time	Membrane Switches
LED Board


	PROM
	PROM		Knob



	SRAM
EL Display	SRAM	Display Driver Board


Microprocessor		Temp
		Channels
		Channels



		Overtemp
PROM		Overtemp




		Watch
SRAM		Dog
SRAM	Audio
		Control Board

Relay Board

RS485

Future Options

and

Modules

Power Supply

Figure 1-1 Block Diagram

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