Mindray BeneView T5 Service Manual

BeneView T5

Patient Monitor

Service Manual

Intellectual Property Statement

SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS CO., LTD. (hereinafter called Mindray) owns the intellectual property rights to this product and this manual. This manual may refer to information protected by copyrights or patents and does not convey any license under the patent rights of Mindray, nor the rights of others. Mindray does not assume any liability arising out of any infringements of patents or other rights of third parties.

Mindray intends to maintain the contents of this manual as confidential information. Disclosure of the information in this manual in any manner whatsoever without the written permission of Mindray is strictly forbidden. Release, amendment, reproduction, distribution, rent, adaption and translation of this manual in any manner whatsoever without the written permission of Mindray is strictly forbidden.

, and are the registered trademarks or trademarks owned

by Mindray in China and other countries. All other trademarks that appear in this manual are used only for editorial purposes without the intention of improperly using them. They are the property of their respective owners.

Contents of this manual are subject to changes without prior notice.

I

FOR YOUR NOTES

II

Preface

Manual Purpose

This manual provides detailed information about the assembling, dissembling, testing and troubleshooting of the equipment to support effective troubleshooting and repair. It is not intended to be a comprehensive, in-depth explanation of the product architecture or technical implementation. Observance of the manual is a prerequisite for proper equipment maintenance and prevents equipment damage and personnel injury.

This manual is based on the maximum configuration; Therefore, some contents may not apply to your monitor. If you have any question, please contact our Customer Service Department.

Intended Audience

This manual is for biomedical engineers, authorized technicians or service representatives responsible for troubleshooting, repairing and maintaining the patient monitors.

Revision History

This manual has a revision number. This revision number changes whenever the manual is updated due to software or technical specification change. Contents of this manual are subject to change without prior notice.

Revision number: 1.0

Release time:

January 2007

© 2007 Shenzhen Mindray Bio-Medical Electronics Co., Ltd. All rights reserved.

III

Abbreviations

Abbreviations used in this manual are:

MPM	multi-parameter module
SMR	satellite module rack
CMS	central monitoring system

Passwords

A password may be required to access different modes within the monitor. The passwords are listed below:

User maintenance: 888888

Factory maintenance: 332888

Demo mode:

2088

IV

Contents

Contents

1 Safety.................................................................................................................................		1-1
1.1	Safety Information ..........................................................................................................	1-1
	1.1.1 DANGER ...........................................................................................................	1-2
	1.1.2 Warnings.............................................................................................................	1-2
	1.1.3 Cautions .............................................................................................................	1-2
	1.1.4 Notes ..................................................................................................................	1-3
1.2	Equipment Symbols ........................................................................................................	1-3

2 Theory of Operation ........................................................................................................		2-1
2.1	Introduction.....................................................................................................................	2-1
2.2	System Connections........................................................................................................	2-2
	2.2.1 Mounting the Patient Monitor............................................................................	2-2
	2.2.2 Connectors for Peripheral Devices.....................................................................	2-3
2.3	Main Unit ........................................................................................................................	2-4
	2.3.1 Input System ......................................................................................................	2-5
	2.3.2 Output System....................................................................................................	2-6
	2.3.3 Processing and Communications System...........................................................	2-8
	2.3.4 Power Management System.............................................................................	2-10
	2.3.5 Equipment Interface System ............................................................................	2-13
2.4	Parameter Module .........................................................................................................	2-15
	2.4.1 Module Communication Board........................................................................	2-15
	2.4.2 Module Power Board .......................................................................................	2-15
	2.4.3 Module Button Board.......................................................................................	2-15
	2.4.4 Parameter Board...............................................................................................	2-15
2.5 SMR ..............................................................................................................................		2-16

3 Testing and Maintenance.................................................................................................		3-1
3.1	Introduction.....................................................................................................................	3-1
	3.1.1 Test Report .........................................................................................................	3-2
	3.1.2 Recommended Frequency..................................................................................	3-2
3.2 Visual Test.......................................................................................................................		3-3
3.3	Power On Test .................................................................................................................	3-4
3.4	Module Performance Tests..............................................................................................	3-4
	3.4.1 Mainstream CO2 Tests........................................................................................	3-4
	3.4.2 Sidestream and Microstream CO2 Module Test .................................................	3-5
	3.4.3 ECG Tests...........................................................................................................	3-6
	3.4.4 Resp Performance Test.......................................................................................	3-7
	3.4.5 NIBP Tests..........................................................................................................	3-8

1

Contents

	3.4.6 IBP Tests............................................................................................................	3-11
	3.4.7 SpO2 Test..........................................................................................................	3-13
	3.4.8 C.O. Test...........................................................................................................	3-13
	3.4.9 Temp Test .........................................................................................................	3-13
	3.4.10 BIS Test..........................................................................................................	3-14
	3.4.11 RM Test ..........................................................................................................	3-14
	3.4.12 ICG Test .........................................................................................................	3-15
	3.4.13 AG Tests .........................................................................................................	3-15
3.5	Nurse Call Relay Performance Test ..............................................................................	3-18
3.6 Analog Output Performance Test ..................................................................................		3-18
3.7	Electrical Safety Tests ...................................................................................................	3-19
	3.7.1 Enclosure Leakage Current Test.......................................................................	3-20
	3.7.2 Earth Leakage Current Test..............................................................................	3-20
	3.7.3 Patient Leakage Current Test ...........................................................................	3-21
	3.7.4 Patient Auxiliary Leakage Current Test ...........................................................	3-21
3.8	Touchscreen Calibration................................................................................................	3-22
3.9	Recorder Check.............................................................................................................	3-22
3.10 Factory Maintenance...................................................................................................		3-23
	3.10.1 Accessing Factory Maintenance Menu...........................................................	3-23
	3.10.2 Drawing Waves ..............................................................................................	3-23
	3.10.3 Recorder .........................................................................................................	3-23
	3.10.4 Software Version ............................................................................................	3-24
	3.10.5 Monitor Information.......................................................................................	3-24
	3.10.6 Calibrate NIBP ...............................................................................................	3-24
3.11 Program Upgrade ........................................................................................................		3-25
4 Troubleshooting................................................................................................................		4-1
4.1	Introduction.....................................................................................................................	4-1
4.2	Part Replacement ............................................................................................................	4-1
4.3	Patient Monitor Status Check..........................................................................................	4-1
4.4	Software Version Check..................................................................................................	4-2
4.5	Technical Alarm Check ...................................................................................................	4-2
4.6	Troubleshooting Guide....................................................................................................	4-2
	4.6.1 Power On/Off Failures .......................................................................................	4-2
	4.6.2 Display Failures .................................................................................................	4-3
	4.6.3 Module Rack Failures ........................................................................................	4-5
	4.6.4 Alarm Problems..................................................................................................	4-7
	4.6.5 Button and Knob Failures ..................................................................................	4-8
	4.6.6 Recorder Failures ...............................................................................................	4-8
	4.6.7 Output Interface Failures....................................................................................	4-9
	4.6.8 CF Card Problems ............................................................................................	4-10
	4.6.9 Power Supply Failures .....................................................................................	4-10
	4.6.10 Network Related Problems.............................................................................	4-12
	4.6.11 Software Upgrade Problems...........................................................................	4-13

2

Contents

5 Repair and Disassembly ..................................................................................................	5-1
5.1 Tools................................................................................................................................	5-1
5.2 Preparations for Disassembly..........................................................................................	5-1
5.3 Disassembling Procedure ................................................................................................	5-2
5.3.1 Separating the Front and Rear Housing .............................................................	5-2
5.3.2 Removing the Power Switch & LED Board ......................................................	5-4
5.3.3 Removing the Knob Encoder .............................................................................	5-4
5.3.4 Removing the Button Board...............................................................................	5-5
5.3.5 Removing the LCD Assembly............................................................................	5-6
5.3.6 Removing the Alarm LED Board.......................................................................	5-8
5.3.7 Removing the Fan Assembly..............................................................................	5-9
5.3.8 Removing Battery Compartment Assembly.......................................................	5-9
5.3.9 Removing the Integral Module Rack ...............................................................	5-10
5.3.10 Removing the CF Card Assembly...................................................................	5-11
5.3.11 Removing the Main Board .............................................................................	5-13
5.3.12 Removing the Speaker ...................................................................................	5-15
5.3.13 Removing the Power Module Assembly ........................................................	5-16
5.3.14 Removing the Main Support ..........................................................................	5-18
5.3.15 Removing the Interface Board Assembly.......................................................	5-18
5.3.16 Removing the Recorder..................................................................................	5-21
5.4 Removing the SMR Assembly ......................................................................................	5-25
5.5 Disassembling Modules ................................................................................................	5-29
5.5.1 Disassembling the ICG Module .......................................................................	5-29
5.5.2 Disassembling CO2 Module.............................................................................	5-33

6 Parts ..................................................................................................................................		6-1
6.1	Introduction.....................................................................................................................	6-1
6.2	Main Unit ........................................................................................................................	6-2
	6.2.1 Exploded View ...................................................................................................	6-2
	6.2.2 Parts List ............................................................................................................	6-2
6.3	Front housing Assembly..................................................................................................	6-3
	6.3.1 12” LCD with Anti-glare Screen........................................................................	6-3
	6.3.2 12” LCD with Touchscreen................................................................................	6-5
6.4	Main Unit ........................................................................................................................	6-7
	6.4.1 Main Unit Assembly ..........................................................................................	6-7
	6.4.2 Battery Compartment Assembly ........................................................................	6-9
	6.4.3 Power Module assembly ..................................................................................	6-10
	6.4.4 Interface Board Assembly .................................................................................	6-11
	6.4.5 Main Board Assembly......................................................................................	6-12
	6.4.6 Integral module rack ........................................................................................	6-13
	6.4.7 Main Support Assembly...................................................................................	6-14
	6.4.8 Rear Housing Assembly...................................................................................	6-15
	6.4.9 CF Card Assembly ...........................................................................................	6-16
	6.4.10 Recorder Assembly ........................................................................................	6-17

3

Contents

6.5 SMR ..............................................................................................................................	6-18
6.5.1 SMR Assembly.................................................................................................	6-18
6.5.2 SMR Inside Assembly......................................................................................	6-19
6.6 Parameter Modules........................................................................................................	6-20
6.6.1 MPM Module...................................................................................................	6-20
6.6.2 C.O. Module.....................................................................................................	6-21
6.6.3 RM Module ......................................................................................................	6-23
6.6.4 ICG Module .....................................................................................................	6-24
6.6.5 AG Module.......................................................................................................	6-26
6.6.6 BIS Module ......................................................................................................	6-27
6.6.7 IBP Module ......................................................................................................	6-29
6.6.8 Mindray CO2 Module.......................................................................................	6-30
6.6.9 Oridion CO2 Module .......................................................................................	6-31
6.7 Replaceable Parts ..........................................................................................................	6-33
6.7.1 Main Unit .........................................................................................................	6-33
6.7.2 SMR .................................................................................................................	6-35
6.7.3 Parameter Modules...........................................................................................	6-35

4

1 Safety

1.1 Safety Information

DANGER

zIndicates an imminent hazard that, if not avoided, will result in death or serious injury.

WARNING

zIndicates a potential hazard or unsafe practice that, if not avoided, could result in death or serious injury.

CAUTION

zIndicates a potential hazard or unsafe practice that, if not avoided, could result in minor personal injury or product/property damage.

NOTE

zProvides application tips or other useful information to ensure that you get the most from your product.

1-1

Safety

1.1.1 DANGER

There are no dangers that refer to the product in general. Specific “Danger” statements may be given in the respective sections of this manual.

1.1.2 Warnings

WARNING

zAll installation operations, expansions, changes, modifications and repairs of this product are conducted by authorized personnel.

zThere is high voltage inside the equipment. Never disassemble the equipment before it is disconnected from the AC power source.

zWhen you disassemble/reassemble a parameter module, a patient leakage current test must be performed before it is used again for monitoring.

zThe equipment must be connected to a properly installed power outlet with protective earth contacts only. If the installation does not provide for a protective earth conductor, disconnect it from the power line and operate it on battery power, if possible.

zDispose of the package material, observing the applicable waste control regulations and keeping it out of children’s reach.

1.1.3 Cautions

CAUTION

zMake sure that no electromagnetic radiation interferes with the performance of the equipment when preparing to carry out performance tests. Mobile phone, X-ray equipment or MRI devices are a possible source of interference as they may emit higher levels of electromagnetic radiation.

zBefore connecting the equipment to the power line, check that the voltage and frequency ratings of the power line are the same as those indicated on the equipment’s label or in this manual.

zProtect the equipment from damage caused by drop, impact, strong vibration or other mechanical force during servicing.

1-2

Safety

1.1.4 Notes

NOTE

zRefer to Operation Manual for detailed operation and other information.

1.2Equipment Symbols

Attention: Consult
accompanying documents		CIS connector
(this manual).
Danger: High-voltage		Network connector
Alternating current(AC)		Defibrillator connector
Power ON/OFF		Connector for satellite
		module rack
Battery indication		Video output
Zero key		Auxiliary output connector
Calibrate key		USB connector
Measure/Standby		Equipotential terminal
		ESD warning symbol for
Check sensor		Electrostatic sensitive
		devices.

Type CF applied part. Defibrillator-proof protection against electric shock.

Type BF applied part. Defibrillator-proof protection against electric shock.

1-3

Safety

FOR YOUR NOTES

1-4

2 Theory of Operation

2.1 Introduction

This patient monitor is designed to monitor a fixed set of physiological parameters including ECG, heart rate (HR), respiration (Resp), temperature (Temp), SpO2, pulse rate (PR), non-invasive blood pressure (NIBP), invasive blood pressure (IBP), cardiac output (C.O.), carbon dioxide (CO2), oxygen (O2), anesthetic gas (AG), impedance cardiograph (ICG), bispectral index (BIS) and respiration mechanics (RM) of single adult, pediatric and neonatal patients

The patient monitor also:

Provides audible and visual alarm indications in case of patient or equipment problems.

Enables displaying, reviewing, storing and transferring of real-time data.

Incorporates multiple input devices such as buttons, knob, touchscreen, keyboard and mouse.

Interfaces a clinical information system or central monitoring system.

Enables program upgrade over the network.

2-1

Theory of Operation

2.2 System Connections

2.2.1 Mounting the Patient Monitor

The patient monitor can be mounted on a wall bracket or on a trolley support. The wall bracket or trolley support can be ordered optionally. Each type of mounting bracket is delivered with a complete set of mounting hardware and instructions. Refer to the documentation delivered with the mounting hardware for instructions on assembling mounts.

CAUTION

zUse mounting brackets we supply or approve. If other compatible mounting bracket is used, be sure it can be safely used on the patient monitor.

zThe mounting bracket should be installed by our qualified service personnel, or engineers who have adequate knowledge on it.

zIf other mounting solution is used, the installation personnel and the customer should verify if it can be safely used on the patient monitor, and the customer assume the responsibility for any risk resulting from that.

2-2

Theory of Operation

2.2.2 Connectors for Peripheral Devices

On the back of the patient monitor you will find all connectors for peripheral devices.

1				2

					4
3					5

6				9

7

8

1.AC Power Connector: used to connect an AC power source (100 to 240 VAC, 50/60Hz).

2.Equipotential Terminal: used to connect the equipotential terminal of other equipment, eliminating potential difference between different pieces of equipment.

3.Defibrillator Connector: It is a RJ11 connector used to connect a defibrillator.

4.CIS Connector: It is a RJ45 connector used to connect a CIS and output 12V DC power supply.

5.Video Output: It is a DVI-D connector used to connect a secondary display.

6.Auxi Output Connector: It is a BNC connector used to output analog signals and nurse call signals.

7.Network Connector: It is a RJ45 connector used to connect an ethernet network or a PC.

8.USB Connector: used to connect any USB-compatible peripheral device.

9.SMR Connector: It is used to connect the SMR and outputs a 12V DC.

2-3

Theory of Operation

2.3 Main Unit

The patient monitor consists of:

Input system: button board, knob, touchscreen, power switch and LED board

Output system: LCD panel, alarm LED board, recorder and speaker

Processing and communications system: main board and integral module rack assembly.

Power management system: battery, battery interface board and power module

Equipment interface system: USB_Hub interface board, DVI interface board and CF card assembly

Additionally, the patient monitor can also connect a satellite module rack (SMR), parameter modules, mouse, keyboard, etc.

The following diagram illustrates the structure of the patient monitor

2-4

Theory of Operation

2.3.1 Input System

Button board

The button board, located at the lower part of the monitor’s front panel, contains 6 keys and provides connections for the following components to the main board:

Knob

Power switch & LED board

Touchscreen control board

Alarm LED board

Inverter

The following diagram shows the button board connections.

Knob

The knob can be pressed, or rotated both clockwise and counter-clockwise. It is connected with the button board.

Touchscreen

The touchscreen enables touch operations and can be calibrated. It is connected with the touchscreen control board and main board.

Power switch & LED Board

The power switch & LED board controls the power supply for the main unit. It has three LEDs, which respectively indicate the AC power status, battery status and monitor power on/off status. It is connected with the button board.

2-5

Theory of Operation

2.3.2 Output System

LCD panel

The patient monitor adopts a high-resolution LCD panel. The LCD panel is connected with the backlight board and the main board. It runs on power from a DC source, which originally comes from the main board, and then goes to the backlight board through the button board, and finally is delivered to the LCD panel by the backlight board.

Alarm Lamp

The patient monitor has two alarm lamps: physiological alarm lamp and technical alarm lamp. The alarm LED board converts electric signals into visual signals and then sends the visual signals to the front panel through the light guiding post. Physiological alarm lamp lights either red or yellow whereas technical alarm lamp lights blue only.

Recorder

The recorder receives data form the main board and then sends them to the thermal printhead for printing. The recorder has a hardkey (starting/stopping recordings) and a green LED on its front panel. It is connected with the mother board.

The following diagram shows its operating principle.

Module	Description
Power interface	Introduces a DC from the main board.
Recorder power	Converts the input power into voltages that fit each module and then
module	forwards them to each module.

2-6

		Theory of Operation
	Recorder CPU	Controls the communications between modules.
	Signal interface	Controls the communications between the main board and the recorder
		CPU.
	Motor drive circuit	Receives the control signals from the CPU and then forwards them to the
		step motors
	Button board &	Sends key commands to the CPU and receive commands controlling the
	indicator interface	indicators from the CPU.
	FPC interface	Sends the thermal printhead information to the CPU and receives the
		commands controlling the thermal printhead from the CPU.

Speaker

The speaker provides sound for alarms, key strokes, heart beats and pulse, and allows PITCH TONE and multi-level tone modulation. It is connected with the main board which provides sound signals.

2-7

Theory of Operation

2.3.3 Processing and Communications System

Main Board

The main board is the heart of the patient monitor. It implements a series of tasks including input & output control, data storage and processing, display processing, system control, communication management, printing management and alarming, etc.

The main board comprises the CPU board and mother board. The following diagram shows interfaces to other components.

The CPU board is an essential CPU system containing the CPU, FLASH, memory, realtime clock, EEPROM, etc. It interfaces to the mother board only, which then provides interfaces to all other external devices.

2-8

Theory of Operation

The mother board is in charge of connections and communications with other components and provides the following interfaces:

	Name	Description
	LCD connector	Connects the built-in display.
	Video output +CIS+GPIO	Connects the digital video interface board.
	port
	USB×2+network+RS422	Connects the USB_Hub board.
	port
	Button board connector	Connects the button board.
	Recorder connector	Connects the recorder.
	CF card connector	Connects the CF card assembly.
	Speaker connector	Connects the speaker.
	Power module connector	Connects the power module.
	Integral module rack	Connects the 3-slot rack communication board in the integral module
	connector	rack.
	Fan connector	Connects the fan.
	CPU board	It is connected with the mother board through a butt socket.
	WLAN assembly	It is welded on the mother board.

Integral Module Rack

The patient monitor has two kinds of integral module rack: 2-slot and 5-slot. The integral module rack consists of control board and communication board.

The control board is a NIOS II module located on the communication board. It implements protocol conversion and infrared communication between the main unit and the parameter modules

The communication board can be a MPM type (2-slot type) or a 3-slot type. It consists of infrared circuit, RS422 communication circuit and power circuit. The communication board is connected with the mother board.

The infrared circuit transmits and receives infrared signals, and controls signal intensity;

RS422 communication circuit implements signal conversion between serial signals and RS422 signals;

Power circuit transforms 12VDC power supply from the mother board into 3.3VDC power supply to run the module rack and provides 12VDC power supply to run the parameter modules.

2-9

Theory of Operation

2.3.4 Power Management System

Battery

The patient monitor uses two chargeable lithium-ion batteries (11.1 V, 4500 mAh). The battery compartment is located at the bottom of the patient monitor. The battery power is supplied to the mother board via the battery interface board, and then to the power module.

NOTE

zAC mains must be used when the CIS is connected with the patient monitor.

Battery Interface Board

The Battery interface board connects the batteries to the DC input terminal of the power module via the mother board, implementing charging and discharging of the batteries and the power board.

Power Module

The power module is located at the back of the patient monitor. The main part of the power module is the power board, which contains charging & power management board, voltage drop DC transforming board and voltage rise and drop DC transforming board.

The power module converts the input power into DC power supplies and then distributes them to each component of the patient monitor. The input power comes from either the batteries or an AC source. The patient monitor will run power from the AC source whenever an AC source is available. If the AC source becomes unavailable, the patient monitor will automatically switch to the battery power. This does not affect the monitor’s operating status.

The power module protects itself and the patient monitor by switching off AC input or DC output in case of overcurrent, short circuit and overvoltage. The power module provides 3 DC outputs:

Outputs

Description

3.3 V

Power supply of the mother board, CPU board, DVI interface board and integral module rack.

5.0 V

Power supply of the DVI interface board, recorder, CF storage card board and USB_Hub board.

12 V

Power supply of the recorder, LCD, integral module rack, parameter modules, USB_Hub board and the CIS

2-10

Theory of Operation

The following diagram shows the pins of the power socket connecting the power module and the mother board:

Pin ID	Marking	Description
1/3/5	12V	The positive output of the 12 VDC power
2/4/6/8/10/	GND	The output grounding terminal of the power
27/28/29/30		board.
7/9	3V3	The positive output of the 3.3 VDC power
11	5V	The positive output of the 5 VDC power
12	BC1	Signal indicating whether battery 1 is available.
		Low level indicates that battery 1 is available and
		high level indicates that battery 1 is not available.
13/15	BAT+1	Input of battery 1, connecting to the positive pole
		of the battery.
14	NTC1	Thermistor signal of battery 1.
16	BC2	Signal indicating whether battery 2 is available.
		Low level indicates that battery 2 is available and
		high level indicates that battery 2 is not available.
18	NTC2	Thermistor signal of battery 2.
17/19	BAT+2	Input of battery 2, connecting to the positive pole
		of the battery.
20	PCON	Power on/off control signal. It is a TTL pulse
		signal inputted from the back board. Every time
		when the power on/off switch is pressed (pulse of
		falling edge), a switch between power “on” and
		“off” happens. The pulse duration is no less than
		0.1 s for power on, 2s for power off and 4s for
		illegal power off.
21	BCON	Backlight on/off signal and switch output signal.
		The main board sends the LCD backlight on/off
		signals to the power board via a serial port, the
		power board processes the signals and output

2-11

Theory of Operation

		them. Low level is output when the backlight is
		off and high level is output when the backlight is
		on.
22	LED-BAT	Battery status indication driving output
23	LED-AC	AC power status indication signal
24	LCD-BR	Backlight brightness control voltage.

2-12

Theory of Operation

2.3.5 Equipment Interface System

USB_Hub board

The USB_Hub board is connected with the mother board. It is compatible with USB1.1 connectors and supports equipment hot plug. Moreover, the USB_Hub board provides RS232 and RS422 interfaces for the communication between main board and SMR. It receives 5 VDC and 12 VDC inputs from the power module, of which the 5 VDC is supplied the USB interface board and the 12 VDC is outputted to the SMR connector through a fuse.

	BNC	Connects analogue output and nurse call.
	RJ 45 connector	It is a standard RJ45 connector, providing 10/100 BASE-TX Ethernet
		communications channels. It connects an Ethernet network or a PC.
	USB connector	Connects devices with USB connector.
		Provides RS232 and RS422 interfaces for the communication between main
	USB&POWER	board and SMR. It receives 5 VDC and 12 VDC inputs from the power
	connector	module, of which the 5 VDC is supplied to the USB interface board and the
		12 VDC is outputted to the SMR connector through a fuse.

2-13

Theory of Operation

DVI Interface Board

The DVI interface board is connected with the mother board. The following diagram shows its interfaces to other components.

Interface	Description
DVI connector	Connects the secondary display.
CIS Connector	Connects the CIS.
RJ 11 connector	Outputs defibrillator synchronization signals.

CF Card Assembly

The CF assembly serves the non-volatile CF card which is used for data storage and transferring. It is connected with the mother board.

2-14

Theory of Operation

2.4 Parameter Module

Each parameter module consists of the module communication board, module power board, module button board, parameter board, etc.

2.4.1 Module Communication Board

The module communication board allows a short delay when powering up the module and adopts FPGA to enable infrared communications between the module and the module rack. It has no electrical connections and is therefore isolated physically. It has an ID, which will be send to the module rack according to the pre-defined baud rate when a module is plug into the module rack.

2.4.2 Module Power Board

Some modules have no power board. There are two kinds of module power board:

1.Isolated power board: converts the 12 V DC into a 12 V isolated DC and a 5 V isolated DC.

2.Non-isolated power board: converts the 12 V DC into a 5 V DC

2.4.3 Module Button Board

There are keys and a LED on the module button board.

2.4.4 Parameter Board

The parameter board is a parameter measurement component, which is the most important component of the parameter module.

2-15

Theory of Operation

2.5 SMR

The satellite module rack (SMR) is independent of the patient monitor. It provides 8 slots for mounting parameter modules. It has the following features:

It allows a parameter module to be plugged and unplugged with the patient monitor on. This allows function extension and patient transfer.

It does not have its own power supply. It is run by 12 V DC supplied by the patient monitor and then supplies power supply to each parameter module via the contact screws.

It implements communication protocol conversions between the patient monitor and each parameter module, provides infrared communications for parameter modules, and is responsible for detecting infrared communications malfunction for each parameter module.

The following diagram shows the structure of the SMR.

2-16