Mindray MEC-1000 Service Manual

MEC-1000
Portable
Patient Monitor

Service Manual

Copyright

SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS CO., LTD. 2003

Version: 1.1
Issued date: May 20, 2005
Series No.: MEC-1000

Statement

SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS CO., LTD. (hereinafter called Mindray)
owns all rights to this unpublished work and intends to maintain this work as confidential.
Mindray may also seek to maintain this work as an unpublished copyright. This publication is
to be used solely for the purposes of reference, operation, maintenance, or repair of Mindray
equipment. No part of this can be disseminated for other purposes.

In the event of inadvertent or deliberate publication, Mindray intends to enforce its rights to
this work under copyright laws as a published work. Those having access to this work may
not copy, use, or disclose the information in this work unless expressly authorized by Mindray
to do so.

All information contained in this publication is believed to be correct. Mindray shall not be
liable for errors contained herein nor for incidental or consequential damages in connection
with the furnishing, performance, or use of this material. This publication may refer to
information and 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.

Content of this manual is subject to changes without prior notice.

PROPERTY OF
SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS CO., LTD. 2003
ALL RIGHTS RESERVED

Responsibility on the manufacturer party

Mindray is responsible for safety, reliability and performance of this equipment only in the
condition that:

• all installation, expansion, change, modification and repair of this equipment are conducted

by Mindray qualified personnel; and,

• applied electrical appliance is in compliance with relevant National Standards; and,

MEC-1000 Service Manual (V1.1) I

• the monitor is operated under strict observance of this manual.

Note

This equipment is not intended for family usage.

Warning

This monitor is not a device for treatment purpose.

It is important for the hospital or organization that employs this equipment to carry out a
reasonable maintenance schedule. Neglect of this may result in machine breakdown or injury
of human health.

Upon request, Mindray may provide, with compensation, necessary circuit diagrams,
calibration illustration list and other information to help qualified technician to maintain and
repair some parts, which Mindray may define as user serviceable.

II MEC-1000 Service Manual (V1.1)

Warranty

Workmanship & Materials

Mindray guarantees new equipment other than accessories to be free from defects in
workmanship and materials for a period of one year (six months for multi-site probes and
SpO2 sensor) from date of shipment under normal use and service. Mindray's obligation
under this warranty is limited to repairing, at Mindray’s option, any part which upon Mindray's
examination proves defective.

THIS WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ALL OTHER WARRANTIES,
EXPRESSED OR IMPLIED, INCLUDING WARRANTIES OF MERCHANT ABILITY OR
FITNESS FOR ANY PARTICULAR PURPOSE.

Exemptions

Mindray's obligation or liability under this warranty does not include any transportation or
other charges or liability for direct, indirect or consequential damages or delay resulting from
the improper use or application of the product or the substitution upon it of parts or
accessories not approved by Mindray or repaired by anyone other than a Mindray authorized
representative.

This warranty shall not extend to any instrument which has been subjected to misuse,
negligence or accident; any instrument from which Mindray's original serial number tag or
product identification markings have been altered or removed, or any product of any other
manufacturer.

Safety, Reliability and Performance

Mindray is not responsible for the effects on safety, reliability and performance of the
MEC-1000 Patient Monitor if:

■ assembly operations, extensions, re-adjusts, modifications or repairs are carried out by
persons other than those authorized by Mindray.

■ the MEC-1000 Patient Monitor is not used in accordance with the instructions for use, or
the electrical installation of the relevant room does not comply with NFPA 70: National
Electric Code or NFPA 99: Standard for Health Care Facilities (Outside the United States,
the relevant room must comply with all electrical installation regulations mandated by the
local and regional bodies of government).

MEC-1000 Service Manual (V1.1) III

Return Policy

Return Procedure

In the event that it becomes necessary to return a unit to Mindray, the following procedure
should be followed:

1. Obtain return authorization. Contact the Mindray Service Department and obtain a
Customer Service Authorization (Mindray) number. The Mindray number must appear on
the outside of the shipping container. Return shipments will not be accepted if the
Mindray number is not clearly visible. Please provide the model number, serial number,
and a brief description of the reason for return.

2. Freight policy. The customer is responsible for freight charges when equipment is
shipped to Mindray for service (this includes customs charges).

Company Contact

Address:

Phone:
Fax:

Mindray Building, Keji 12th Road South, Hi-tech Industrial

[phone]
[phone]

EC Representative

Name:
Address:
Phone:
Fax:

Shanghai International Holding Corp. GmbH(Europe)
Eiffestrasse 80 D-20537 Hamburg Germany
[phone]
[phone]

Park, Nanshan, Shenzhen, 518057, P. R. China

IV MEC-1000 Service Manual (V1.1)

Preface

This service manual gives a detailed description of the MEC-1000 Patient Monitor, including
circuit descriptions, test procedures and a spare part listing. This manual is intended as a
guide for technically qualified personnel during repair, testing or calibration procedures.

Following symbols indicates some important facts that you have to pay special attention to:

Warning Points to be noted to avoid injury to the patient and the operator.

Caution Points to be noted to avoid damage to the equipment.

Note Points to be noted.

MEC-1000 Service Manual (V1.1) V

Contents

Contents

Chapter 1 General...........................................................................................................1-1

Chapter 2 Principle.........................................................................................................2-1

2.1 MEC-1000 Principle.................................................................................................2-1

2.2 Main control part......................................................................................................2-3

2.3 Parameter Part.........................................................................................................2-4

2.4 Power Board............................................................................................................2-9

2.5 Key Board……………………………………………………………………………….2-11

2.6 Recorder………………………………………………………….……….……….2-12

Chapter 3 Product specification....................................................................................3-1

3.1 Classification............................................................................................................3-1

3.2 Specification.............................................................................................................3-1

Chapter 4 I Structure and Part List ...............................................................................4-1

4.1MEC-1000 Explosive view ........................................................................................4-1

4.1.1 MEC-1000 Explosive view ....................................................................................4-1

4.1.2 MEC-1000 TFT Screen Assembly……………………………………. ....................4-3

4.1.3 MEC-1000 Bracket Assembly...............................................................................4-5

4.1.4 Parameter Socket Assembly .................................................................................4-7

4.1.5 Rear panel Assembly……………………………………. .......................................4-8

4.2 Use of Battery..........................................................................................................4-9

4.3 Part List..................................................................................................................4-9

Chapter 5 Tests...............................................................................................................5-1

5.1 Test Procedure ........................................................................................................5-1

5.2 NIBP Calibrating Method .........................................................................................5-3

5.3 Safety tests……………………………………. .........................................................5-3

Chapter 6 Maintenance and Cleaning...........................................................................6-1

Chapter 7 Troubleshooting............................................................................................7-1

Chapter 8 Maintenance menu........................................................................................8-1

MEC-1000 Service Manual (V1.1) I

General

Chapter 1 General

MEC-1000 is a flexible, portable patient monitor. MEC-1000 can monitor physiological signals
including ECG, RESP. Rate, NIBP, SpO
physiological signals into digital signals, which can be further processed and used to judge
whether to trigger alarm. The user can control the operation of MEC-1000 via using the
buttons on the front panel. MEC-1000 can be connected to the central monitoring system via

the Mindray network so as to form a network monitoring system.

MEC-1000 uses ECG electrodes, SpO
probe to measure the physiological signals including ECG, NIBP, SpO
Rate. In the process of measurement no energy or substances are extracted from and/or
delivered to the patient with the exception that sine wave signals are delivered to the patient
during measuring RESP Rate. MEC-1000 converts the acquired physiological signals into
digital signals, waveform and numerical values and displays all information on the screen. The
user can also control the operation of the monitor via using the buttons on the front panel. The
user can set alarm limits for each parameter. In this way once finding a physiological
parameter exceed the pre-set alarm limits, MEC-1000 will activate its visual and audio alarm
(the numerical display flashes or lights on) in order to raise the user’s attention.

, and TEMP. MEC-1000 can convert these

2

finger sensor, blood pressure cuff and temperature

2

, TEMP and RESP

2

1.1 General

During treatment, it is highly important to continuously monitor the vital physiological signs of
the patient to transmit the important information. Therefore patient monitor has always been
occupying a very important position in the filed of medical devices. The continuous
improvement of technologies not only helps us transmit the vital physiological signs to the
medical personnel but also simplifies the measurement and as a result raise the monitoring
efficiency. For inpatients, we need to measure those vital cardiac and pulmonary signs such
as ECG, SpO

, blood pressure and TEMP, etc. In recent years, the technological improvement

2

pertaining to measurement and information transmission has led to more comprehensive
performance and stable quality of the patient monitoring products. In the past, the dominant
products manufactured by medical device manufacturers are mainly those for single
parameter measurement. Nowadays however multi-parameter patient monitors are more
widely and commonly used.

1.2 Intended Use

MEC-1000 patient monitor can measure physiological signals including ECG, RESP., NIBP,

and TEMP. It can convert these physiological signals into digital signals and further

SpO

2

display them on the screen. The alarm limits can be user-defined. Once finding a parameter
reach or exceed its pre-set alarm limits, MEC-1000 can automatically activate the
corresponding alarm. In addition, the user can operate the monitor by using the buttons on
the front panel. In addition to outpatient department, monitors are generally used in some
clinical areas such as ICU, CCU, operation room and emergency room because the monitor
can provide many other physiological parameters of the patient to medical personnel. Only

MEC-1000 Service Manual (V1.1) 1-1

General

the qualified medical personnel shall use MEC-1000 patient monitor.

1.3 Environmental Conditions

1.3.1 Temperature

Operating 0 - 40 °C
Transportatio n and Storage -20 - 60 °C

1.3.2 Humidity

Working 15% ~ 95%
Transport and Storage 10% ~ 95%（noncondensing）

1.3.3 Altitude

Operating -500 to 4,600 meters
Transportation and Storage -500 to 13,100 meters

1.3.4 Electrical specification

100-250 VAC, 50/60Hz，max. input power consumption 110VA

1-2 MEC-1000 Service Manual (V1.1)

Principle

Chapter 2 Principle

2.1 MEC-1000 Principle

MEC-1000 portable patient monitor has been designed to measure physiological parameters
including ECG, RESP, TEMP, NIBP and SPO2, etc. Figure2-1 shows the structure of the
whole monitor as well as the connection relationships between different parts. The board in
the center of the figure is the core part of the monitor, i.e., integrated board for main control
and parameter measurement, which, though being a single board, could realize the
measurements of five said parameters; accordingly uniform AD conversion and digital
processing system is used.

Figure 2- 1 MEC-1000 structure and part relationship

In terms of its functionality, MEC-1000 is made up of following parts:

1) Parameter measurement part

2) Main control part

3) Man-machine interface

4) Power supply

5) Other auxiliary part
Below is the detailed introduction to each part.

MEC-1000 Service Manual (V1.1) 2-1

Principle

2.1.1 Parameter measurement part

Parameter measurement and monitoring are primary functions of the monitor. The parameter
measurement part of the monitor consists of measurement probe (excluded in figure 2-1),
parameter input socket assembly, NIBP assembly and the parameter part of the main control
board. Its function is to convert the physiological signals into electronic signals, process them
and execute calculations according to pre-set programs or the commands from the main
control part, and then to send data of values, waveforms and alarms back to the main control
part. The data will then be displ ayed via man-ma chine interface.

2.1.2 Main control part

The main control part of the integrated board is to drive man-machine interface, manage
parameter measurement and provide other specific functions to the user such as
configuration storage, waveform and data recall, etc.

2.1.3 Man-machine interface

The man-machine interfaces are LCD display, recorder, speaker, indicator, keys and knob.
The LCD display is the most primary output interface, displaying real-time or history data and

waveforms, various patient information and alarm prompts on the screen for the user’s
observation.

Recorder is an auxiliary device to the display, which could print out various user-selected data
for use and preservation.

Speaker gives audio alarm.
Indicator provides additional information about power supply, battery and alarm.
Keys and knob are user input interface of the system, by using which the user could input

information and instructions into the monitor.

2.1.4 Power supply

Power supply is an important part of the system, consisting of power board, backlight board,
battery and fan.

The main power board converts the AC mains input into 5V and 12V DC to energize other
parts of the system. Similarly LCD display requires particular supply, for which case a
backlight board is supplied. The battery could maintain the formal function of the system for a
short period when AC mains is disconnected. A small fan requiring DC input is used to realize
superior ventilation.

2.1.5 Other auxiliary part

Network port is available on MEC-1000, which allows the service engineer to upgrade the
system software without necessarily opening the enclosure of the monitor.And can be

2-2 MEC-1000 Service Manual (V1.1)

connected to the Minday Center manage System.

2.2 Main Control Part

2.2.1 Functions of main control part

As the core part of the whole system, it finishes the following functions:

1) control, management and scheduling of parameter measurement part, recorder and

keyboard;

2) display drive of TFT screen, STN screen and CRT screen;

3) 3-way expansion serial port realized by FPGA;

4) alarm given for system fault;

5) storage of RTC, hardware WatchDog and relevant parameters

2.2.2 Schematic Diagram

Principle

UART

RTC

Watchdog

CPU System

RAM/ROM

FPGA

interface

Display

interface

VRAM

Figure 2-2 Schematic Diagram of Main Control Part

2.2.3 Introduction to Principle

The main control Module, being the center part of the system, has serial port s to various
modules, TFT display interface, CR T display interface. The BDM interface is reserved on the
board for debugging or downloading software.

2.2.3.1 CPU System

CPU is the core element on the main control Module. It connects peripheral modules through
BUS and I/Os in order to finish data communication, data processing and logic control, etc.

MEC-1000 Service Manual (V1.1) 2-3

Principle

2.2.3.2 RTC

RTC (real-time clock) provides time (hour, minute, second) and date (year, month, day)
information. RTC information can be changed by CPU.

2.2.3.3 FPGA and VRAM

VRAM is used to save display data. CPU sends display data to VRAM via FPGA. The data in
VRAM is a map of the real display device.
FPGA has various extended serial ports, which communicate with external Parameter Parts.
CPU writes acquired data to FPGA, and FPGA sends it to external Parameter Parts.

2.2.3.4 Watchdog

Upon power-up, Watchdog supplies Reset signals to CPU, FPGA and Ethernet Controller.

Provide functions of Waterdog Timer Output and voltage supervise.

2.2.3.5 Ethernet Controller

Ethernet Controller complies with IEEE802.3 / IEEE802.3u LAN standard, supports 10Mbps
and 100Mbps data rates, and realizes the data communication between CPU and Ethernet.

2.3 Parameter Part

2.3.1 Introduction to Principle

The parameter part collects, amplifies and filters the signals of the said five physiological
parameters, executes A/D over the signals and processes the result signals. Figure 2 -3 shows
the structure of this part.

ECG\RESP

Signal

Input\Process

TEMP Signal

Input\Process

SPO2 Signal

Input\Process

NIBP Signal

Input\Process

CPU

System

A／D

Watchdog

Power &

Signal

isolate

Circuit

Figure 2-3 Schematic Diagram of Parameter Part

A/D and CPU in parameter part are shared for processing signals of the said five parameters,
i.e., ECG, RESP, TEMP, NIBP and SPO2.

A/D
Convert analog signals output from parameter circuit into digital signals, and send them

2-4 MEC-1000 Service Manual (V1.1)

into CPU part to receive further processing.

CPU System

Realize logic control over all parameter parts and A/D p art.
Process data of each parameter;
Communicate with main board.

Power & Signal isolate Circuit

Realize isolation from external circuit in order to ensure human safety;
Provide power supplies for circuits;
Realize isolating communication between CPU System and main board.

Watchdog

Upon power-on, supply Reset signal to CPU;
Provide functions of Watchdog Timer Output and voltage detection.

2.3.2 ECG/RESP Module

Principle

2.3.2.1 General

This module is designed to measure two parameters including ECG, RESP.

2.3.2.2 Schematic Diagram

Figure 2-4 Schematic Diagram of ECG/RESP Module

2.3.2.3 Introduction to Principle

This module uses ECG cables to collect ECG, RESP signals, process them and transmit them
to the main control part through serial port.

ECG Signal Input Circuit
Input protection and filter circuit: receives ECG signals from cables, removes high-frequency

MEC-1000 Service Manual (V1.1) 2-5

Principle

interference and prevents the circuit from being damaged by high voltage generated in
defibrillation and ESD.
Right leg drive circuit: picks up 50/60Hz common-mode signals in lead wire and feeds them
back to patient body; suppresses the common-mode interference in lead wire for the sake of
better detecting ECG signals.
Lead Off detection circuit: detects if any ECG lead falls off and transmits relevant message to
CPU.

ECG Signal Process Circuit
Differential Amplification circuit: first-order amplifies ECG signals and suppresses

common-mode interference at the same time.
Low-pass filter circuit: removes high-frequency interference outside frequency band of ECG
signals.
PACE signals are ECG pacing signals, which greatly affect ECG detecting performance.
Therefore PACE suppression circuit is designed to suppress PACE signals in order to better
detect ECG signals.
Master AMP/Filter circuit: amplifies and filters ECG signals again and transmits them
furthermore into A/D converte r.

Pace Detect
Pick PACE signals out of ECG signals and transmit them to CPU.

Carrier Generate Circuit
RESP measurement is based on Impedance method. Respiration causes the changes of

thoracic impedances, which feature is taken advantage to modulate the amplitude of high
frequency carrier. The modulated signals are then sent into the measuring circuit. This circuit
is designed to generate high frequency carrier

RESP Signal Input Circuit
Couples the RESP signals into the detection circuit.

RESP Signal Process Circuit
Preamplifier circuit: amplifies and filters RESP signals;

Detection circuit: picks out the RESP wave modulated in excitation signals;
Level translation circuit: removes DC components in RESP signals;
Master AMP/Filter circuit: amplifies and filters RESP signals again and transmits them
furthermore into A/D converte r.

A/D and CPU System (Description in frame of dashed lines)
Refer to the 2.3.1

2-6 MEC-1000 Service Manual (V1.1)

Principle

2.3.3 TEMP Module

2.3.3.1 General

This module uses sensors to collect TEMP signals, process them and transmit them to the
main control part through serial port.

2.3.3.2 Schematic Diagram

Figure 2-5 Schematic Diagram of TEMP Module

2.3.3.3 Introduction to Principle

Measure temperature of body surface or endocavity by taking advantage of the characteristics
of the thermal-sensitive resistor whose impedance varies with temperature of human body.

Temperature Detect Circuit
Receive the signal transmitted from TEMP sensor, amplify the signal and send it into A/D

converter.

A/D and CPU System (Description in frame of dashed lines)
Refer to the 2.3.1

2.3.4 SPO2 Module

2.3.4.1 General

This module is designed to measure SPO2.

MEC-1000 Service Manual (V1.1) 2-7