Service Manual
52 Pages
Preview
Page 1
PM-60
Pulse Oximeter
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.
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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 pulse oximeter. 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 pulse oximeter.
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:
July 2007
© 2007 Shenzhen Mindray Bio-Medical Electronics Co., Ltd. All rights reserved.
Password
Maintenance password: 321
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FOR YOUR NOTES
IV
Contents 1 Safety ... 1-1 1.1 Safety Information ... 1-1 1.1.1 Dangers ... 1-2 1.1.2 Warnings... 1-2 1.1.3 Cautions ... 1-2 1.1.4 Notes ... 1-2 1.2 Equipment Symbols ... 1-3 2 Theory of Operation ... 2-1 2.1 Introduction... 2-1 2.2 System Connections ... 2-1 2.2.1 Mounting the Pulse Oximeter ... 2-1 2.2.2 Connectors for Peripheral Devices... 2-2 2.3 Main Unit ... 2-3 2.3.1 Main Control Unit ... 2-3 2.3.2 Power Supply ... 2-6 2.3.3 Main Board Interfaces... 2-9 2.3.4 SpO2 Module... 2-10 2.3.5 Charger stand ...2-11 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 ... 3-3 3.4 Performance Tests ... 3-4 3.4.1 SpO2 Test... 3-4 3.4.2 SpO2 Test in Motion Mode... 3-4 3.5 Electrical Safety Tests ... 3-5 3.5.1 Enclosure Leakage Current Test... 3-6 3.5.2 Patient Leakage Current Test ... 3-6 3.6 Output Interface Test... 3-7 3.6.1 RS232 Port test... 3-7 3.6.2 Infrared Output Test ... 3-7 3.7 Program Upgrade ... 3-8 4 Troubleshooting... 4-1 4.1 Introduction... 4-1 1
4.2 Part Replacement ... 4-1 4.3 Software Version Check ... 4-2 4.4 Technical Alarm Check ... 4-2 4.5 Troubleshooting Guide... 4-3 4.5.1 Power On/Off Failures ... 4-3 4.5.2 Display Failures ... 4-3 4.5.3 Alarm Problems... 4-4 4.5.4 Button Failure... 4-4 4.5.5 Interface Failures... 4-4 4.5.6 Power Supply Failures ... 4-5 4.5.7 Software Upgrade Problems... 4-5 5 Repair and Disassembly ... 5-1 5.1 Tools... 5-1 5.2 Preparations for Disassembly... 5-1 5.3 Disassembly Guide ... 5-2 5.3.1 Removing the Covers... 5-2 5.3.2 Removing the Main Board ... 5-4 5.3.3 Removing the Speaker and SpO2 Communication Cable Socket... 5-4 5.3.4 Removing the LCD Screen ... 5-5 5.3.5 Remove the Screen Mount ... 5-6 6 Parts ... 6-1 6.1 Introduction... 6-1 6.2 Main Unit ... 6-2 6.3 Front Panel Assembly ... 6-3 6.4 Main Board Assembly... 6-4 6.5 Battery Adjusting Bracket Assembly ... 6-5 6.6 Rear Cover Assembly... 6-6 6.7 Replacement Parts... 6-7
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1 Safety 1.1 Safety Information
DANGER z
Indicates an imminent hazard that, if not avoided, will result in death or serious injury.
WARNING z
Indicates a potential hazard or unsafe practice that, if not avoided, could result in death or serious injury.
CAUTION z
Indicates a potential hazard or unsafe practice that, if not avoided, could result in death or serious injury.
NOTE z
Provides maintenance tips or other useful information.
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1.1.1 Dangers There are no dangers that refer to the maintenance in general. Specific “Danger” statements may be given in the respective sections of this manual.
1.1.2 Warnings
WARNING z
All installation operations, expansions, changes, modifications and repairs of this product should be conducted by Mindray authorized personnel only.
z
Always disconnect the equipment with the charger stand and remove the batteries before disassembling the equipment.
z
Dispose of the packaging material according to local waste control regulations and your hospital’s waste disposal protocols. Keep the packaging material out of children’s reach.
1.1.3 Cautions
CAUTION z
Make sure that no electromagnetic radiation interferes with the performance of the equipment when preparing to carry out performance tests. Mobile phone, X-ray equipment and MRI devices are possible sources of interference as they may emit higher levels of electromagnetic radiation.
z
Before connecting the charger stand to the AC mains, check that the voltage and frequency ratings of the AC mains meet the specifications indicated on the equipment’s label or in this manual.
z
Protect the equipment from damage caused by drop, impact, strong vibration or other mechanical force during servicing.
1.1.4 Notes NOTE z
Refer to Operation Manual for detailed operation and other information. 1-2
1.2 Equipment Symbols Direct Current (DC) Attention: Consult this manual before maintenance. Auxiliary output connector Audio pause Battery door locked/unlocked Power supply connector Left/Right button Power button Up button Down button Date of manufacture Serial number Safety Class II equipment Type BF applied part, defibrillation protected The following definition of the WEEE label applies to EU member states only. This symbol indicates that this product should not be treated as household waste. By ensuring that this product is disposed of correctly, you will help prevent bringing potential negative consequences to the environment and human health. For more detailed information with regard to returning and recycling this product, please consult the distributor from whom you purchased it. * For system products, this label may be attached to the main unit only.
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FOR YOUR NOTES
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2 Theory of Operation 2.1 Introduction This pulse oximeter is designed to monitor or measure the oxygen saturation and pulse rate of single adult, pediatric and neonatal patient. The pulse oximeter also:
Presents audible and visual alarms in case of patient or equipment problems.
Enables the real-time displaying, reviewing, storing and exporting of SpO2 and PR values.
Supports Pitch Tone, which means the pitch of pulse tone rises as the oxygen saturation level increases and falls as the oxygen saturation level decreases.
Operates on either alkaline batteries or a lithium-ion battery.
Offers wired or wireless communication with a personal computer.
2.2 System Connections 2.2.1 Mounting the Pulse Oximeter The pulse oximeter 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 for use. To install the pulse oximeter, refer to the instrutions for installation.
CAUTION z
Use mounting brackets we supply or approve. If other compatible mounting bracket is used, be sure it can be safely applied to the pulse oximeter.
z
The mounting bracket should be installed by our qualified service personnel, or mechanical engineers who have adequate knowledge on it.
z
If other mounting solution is used, the installation personnel and the customer should verify if it can be safely applied to the pulse oximeter, and the customer assume the responsibility for any risk resulting from that. 2-1
2.2.2 Connectors for Peripheral Devices The connectors for peripheral devices are located at the top, right side and bottom of the pulse oximeter as shown in the figure.
Multifunctional connector It is a DB 9 connector which is used to connector a Mindray SpO2 sensor (including reusable sensor, disposable sensor and veterinary sensor) to measure the oxygen saturation or connect a personal computer through a PC communication cable to export trend data.
Infrared port It is a port through which a personal computer is communicated using a infrared adapter to export data in real time without affecting patient monitoring.
Power supply connector It is a female power socket which is used to connect the charger stand’s male power plug . To avoid being mixed with other power supply adapters, it has nonstandard size.
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2.3 Main Unit The pulse oximeter consists of main board, SpO2 board, display, speaker, batteries and charger stand. The main board is composed of a main control unit and a power module. The following diagram shows the structure of the main unit.
2.3.1 Main Control Unit The main control unit provides the system with resources and support. It controls the LCD screen, alarm LED, speaker, button operation and data storage. It also implements communication with the SpO2 board, power module and external interfaces. The functional block diagram of the main control unit is shown below:
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2.3.1.1 Power Supply The power module provides the main control unit with 3.1 V, 2.5 V and 0.9 V power supple. Label
Voltage
Applicable parts
DVDD
3.1 V
Alarm LEDs, Flash memory, infrared light-emitting IC, PC communication cable, LCD boost up circuit, prestage audio optional amplifier.
VDDE
2.5 V
DSP peripheral voltage, SDRAM, LCD logic, infrared logic, buttons and resetting.
VDDINT
0.9 V
DSP kernel voltage
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2.3.1.2 Core Control Unit The Core control unit consists of CPU, SDRAM and Flash memory. The CPU is ADI’s DSP BF531. Its kernel running frequency is up to 400 MHz and external frequency up to 133MHz. The kernel voltage is 0.8 V and the current consumed at 50 MHz is as low as 26mA. The oscillating frequency of the CPU clock is 11.0592 MHz and its expected frequency is 55MHz, which can be implemented through internal PLL frequency multiplication. The SDRAM provides space for program running and the Flash memory provides space for storing program, data, lingual library and configuration information. The BF531 starts directly from the Flash memory.
2.3.1.3 Man-machine Interfaces The functions of the buttons are listed below: Button
In measurement mode
Audio Pause button
Pauses audible alarms.
In menu mode Pauses audible alarms.
Up button
Increases the beat volume.
Moves the cursor upwards or increases the value of selected menu item by one.
Down button
Decreases the beat volume.
Moves the cursor downwards or decreases the value of selected menu item by one.
Left button
Enters the main menu
Enters a submenu or confirm the selection.
Right button
Locks/Unlocks buttons.
Returns to the previous menu or exits the current menu.
LCD screen It is a 2.4” standard QVGA (320×240) TFT LCD with a 36-pin connector. The LCD is connected with the BF531 through a bus. 4 LEDs in series are used to backlight the LCD. The maximum current is 15mA and driving voltage 13.2V. The main control board provides DC power supply for the LCD and the backlight board.
Alarm lamp The alarm lamp gives visual alarm signals which meet applicable requirements. It consists of 4 LEDs in parallel. The alarm LEDs receive electrical signal sent by the main board and convert it into optical signal which is then sent to the panel through a light conducting bar. The alarm LEDs light up in red and yellow. 2-5
Audible indicators Audio files including alarm tone, button tone and pulse tone are burned in a serial flash memory in advance. To give out a sound, the CPU reads audio data from the flash memory and controls the puse-width modulation (PWM) to give out a audible signal. The pulse oximeter supports pitch tone and multi-level volume. The speaker is connected with the main board and the audible signal is provided by the main board.
2.3.1.4 Communication Interfaces
RS232 port The RS232 port implements communication through the CPU’s UART module and the RS232 drive chip. The RS232 drive chip which is integrated in the PC communication cable is electrostatically protected. The CPU’s UART module has an external drive IC to enforce driving and ensure protection.
Infrared port The BF 531’s UART supports infrared transmission. The transmitted and received signals are connected directly to the infrared IC.
2.3.2 Power Supply The power module provides hardware for power supply management. It detects the level required by all hardware, the priority of power supply type as well as the power supply status. It is also controls the power indicating lamp and real-time clock, manages battery charging and communicates with the main control unit. The block diagram of the power module is shown below:
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2.3.2.1 Input The pulse oximeter runs on a chargeable lithium-ion battery or three alkaline AA size batteries.
Lithium-ion battery: voltage 3.7V, capacity 1800mAh;
Alkaline AA size batteries: three batteries in series, the total voltage 4.5V.
Connect the pulse oximeter to the charger stand and then connect the AC mains. The battery will be charged automatically if a lithium-ion battery is used. However, if alkaline batteries are used, the batteries will not be charged.
2.3.2.2 Output
1.
2.
3.
SpO2 circuit 3.3V
20mA (Peak 120mA)
±2.5V
10mA
Main control circuit 3.1V
5mA (Peak 150mA)
2.5V
50mA (Peak 150mA)
0.9V
20mA (Peak 50mA)
LCD backlight and speaker are directly run by the power supply.
2.3.2.3 Power Supply Management
1.
Shutdown delay When the battery voltage is too low, an alarm message “Battery Too Low” is presented and the pulse oximeter will shut down automatically in maximum 10 minutes.
2.
Run time In the case that SpO2 is monitored continuously, audio indicators are off and backlight brightness is set to minimum, the run time of alkaline batteries is 36 hours and lithium-ion battery 24 hours, using a new, fully charged battery at ambient temperature 25℃.
3.
The power supply efficiency is not less than 80 percent.
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2.3.2.4 Charging the Lithium-ion Battery The pulse oximeter is configured with a lithium-ion battery charging circuit which can detect battery charging status and provide protection against overtime, overcurrent as well as overtemperature charging. It automatically charges the battery in circle and enters into the sleeping mode when the battery is fully charged. The system identifies battery type through BC pole to avoid charging the alkaline batteries. The charge time to 90% capacity is less than 2 hours and to 100% capacity less than 3.5 hours.
2.3.2.5 Man-machine Interfaces
Button To avoid pressing the Power button by accident, you have to press and hold it for 2 seconds when you need to turn off the pulse oximeter. However, to turn on the pulse oximeter, just press it momentarily.
LED indicator The Power Indicating lamp is a LED that lights green and yellow. It is located on the main board. The status of the LED is specified as follows:
Green:
when the pulse oximeter is plugged in the charger stand, and the AC mains is connected, or when the battery is fully charged if a lithium battery is used.
Yellow: when a lithium ion battery is used and is being charged.
Off:
When the AC mains is not connected.
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2.3.3 Main Board Interfaces The main board implements connection and communication with other parts and peripheral devices. The interfaces located on the main board are listed below: No.
Description
What to connect
J1
LCD connector
LCD screen
J2
SpO2 board connector
SpO2 board, providing power supply and communicating the SpO2 board
J3
SpO2 sensor connector
SpO2 board, connecting the SpO2 sensor to the SpO2 board
J4
Multifunctional connector
SpO2 sensor or personal computer
J5
DSP simulator connector
DSP simulator
J6
Speaker connector
Speaker
J7
DC connector
Charger stand
J8
Battery positive pole connector
Battery positive pole
J9
Common earthing connector
Charger stand or battery negative pole
J10
BC connector
Lithium-ion battery BC pole, detecting battery type
J11
NTC connector
Lithium-ion battery NTC pole, detecting battery temperature
J12
Power supply program downloading connector
Power supply MCU programmer
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