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.
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.
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...................................................................................
4.2 Part Replacement ............................................................................................................ 4-1 4.3 Software Version Check .................................................................................................. 4-2 4.4 Technical Alarm Check ................................................................................................... 4-2 4.5 Troubleshooting Guide.............................................................................................
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.
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.
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.
FOR YOUR NOTES 1-4
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.
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.
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.
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.
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.
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.
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.
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.
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.
2.3.4 SpO2 Module The SpO2 module measures oxygen saturation and pulse rate and offers Pleth wave and perfusion strength. It also offers motion and poor perfusion proof, detects status and fault, and communicates with the main control unit.
2.3.4.1 Analog Circuit The SpO2 module analog circuit adopts low power consumption design. The voltage of signal amplifying part is ±2.5V. The first stage amplifying multiple is adjustable. The sensor's driving voltage is 3.3V. 2.3.4.2 Digital Circuit The digital circuit part mainly consists of microprocessor circuit and watchdog circuit. The ADuC7024 microprocessor used on the SpO2 module is AD’s 16/32-bit MCU.
FOR YOUR NOTES 2-12
3 Testing and Maintenance 3.1 Introduction To ensure the pulse oximeter always functions normally, qualified service personnel should perform regular inspection, maintenance and test. This chapter provides testing procedures for the pulse oximeter with recommended test equipment and frequency. The service personnel should perform the testing and maintenance procedures as required and use appropriate test equipment.
3.1.1 Test Report After completing the tests, service personnel are required to record test results in the following table and report them to our Customer Service Department. Test Equipment Name Model/PN Expiry Date Test point Test Results Tested by: Date: Test Record No. Test item 1 2 Conclusion Pass/Fail: 3.1.2 Recommended Frequency Check/Maintenance Item Frequency Visual test When first used or not used for a prolonged time. Power on test 1.
3.2 Visual Test Inspect the equipment for obvious signs of damage. The test is passed if the equipment has no obvious signs of damage. Follow these guidelines when inspecting the equipment: Carefully inspect the case, the display screen and the buttons for physical damage. Inspect all external connections for loose connectors, bent pins or frayed cables. Inspect all connectors on the equipment for loose connectors or bent pins.
3.4 Performance Tests 3.4.1 SpO2 Test Required tool: SpO2 simulator 1. Connect the pulse oximeter with the SpO2 sensor. 2. Connect the SpO2 sensor with the SpO2 simulator. 3. Select the model and manufacturer of the SpO2 module under test; set SpO2 to 96% and PR to 80 bmp. 4. The SpO2 and PR readings should be within the ranges listed below. SpO2 (%) PR (bmp) 96%±2% 80±3 3.4.2 SpO2 Test in Motion Mode Required tool: SpO2 simulator. 1. Connect the pulse oximeter with the SpO2 sensor. 2.
3.5 Electrical Safety Tests WARNING z Electrical safety tests are a proven means of verifying the electrical safety of the equipment. They are intended for determining potential electrical hazards. Failure to find out these hazards timely may cause personnel injury. z Commercially available test equipment such as safety analyzer, etc. can be used for electrical safety tests. Be sure that the test equipment can be safely and reliably used with the pulse oximeter before use.
A: AC mains (programmable and frequency adjustable) B: Isolation transformer on the leakage current testing apparatus C: Safety analyzer D: Unit under test Tools required: Safety analyzer Isolation transformer 3.5.1 Enclosure Leakage Current Test 1. Connect the 601 safety analyzer to an AC power supply (264 V, 60 Hz). 2. Connect the SpO2 sensor to the RA terminal of the 601 safety analyzer. 3.
3.6 Output Interface Test 3.6.1 RS232 Port test 1. Use a PC communication cable to connect the multifunctional connector of the pulse oximeter under test with the RS232 port of a personal computer. 2. Select [Menu]→[Trend] to enter the trend window. 3. Press the Left button to enter the [Trend Setup] menu. 4. Set [Export Port] to [Wire]. 5. Select [Export Trend] to enter the trend window; verify that trend data is exported correctly. 3.6.2 Infrared Output Test 1.
3.7 Program Upgrade You can upgrade the pulse oximeter software by downloading the upgrade software through a serial port. The upgrade software can run directly on a personal computer.
4 Troubleshooting 4.1 Introduction In this chapter, problems are listed along with possible causes and recommended corrective actions. Refer to the tables to check the pulse oximeter, identify and eliminate the troubles. The troubles we list here are frequently arisen difficulties and the actions we recommend can correct most problems, but not all of them. For more information on troubleshooting, contact our Customer Service Department. 4.
4.3 Software Version Check Some troubleshooting tasks may require you to identify the configuration and software version of your pulse oximeter for software compatibility. For detailed information on version compatibility, contact our Customer Service Department. To check the version information, 1. Select [Menu]→[System]→[Maintenance >>]→enter required password→[Version >>]. In the [Version] menu, you can view PCBA version and copyright information. 2.
4.5 Troubleshooting Guide 4.5.1 Power On/Off Failures Symptom Possible Causes Corrective Actions The pulse oximeter fails to start. Batteries are not installed; Install batteries and then check if the pulse oximeter can be powered on. The pulse oximeter is turned on when being connected with the charger stand. Batteries discharged. Replace the alkaline batteries or charge the lithium-ion battery. Batteries make improper electrical contact Check that batteries contact the pulse oximeter properly.
4.5.3 Alarm Problems Symptoms Possible Causes Corrective Actions Alarm lamp does not light or extinguish but alarm sound is issued. Main board defective Replace the main board. No alarm sound is issued but alarm lamp lights up properly Alarm volume is set to zero. Select [Menu]→[Normal Setup]; adjust [Alm Vol]. Speaker failure Replace the speaker. Main board defective Replace the main board. 4.5.4 Button Failure Symptoms Possible Causes Corrective Actions Buttons do not work.
4.5.6 Power Supply Failures Symptoms Possible Causes Corrective Actions Battery cannot be fully charged. Battery defective Replace the battery Main board defective Replace the main board. Battery cannot be charged. Battery defective Replace the battery Charger stand fails Replace the charger stand. Main board defective Replace the main board. NOTE z When the power module has a failure, it may cause problems to other components, e.g.
FOR YOUR NOTES 4-6
5 Repair and Disassembly 5.1 Tools The following tools may be required for disassembly and repair: Small screwdriver Sharp-nose pliers Tweezers 5.2 Preparations for Disassembly Before disassembling the pulse oximeter, stop monitoring the patient, turn off the pulse oximeter and disconnect all the accessories and peripheral devices. CAUTION z Before disassembling the pulse oximeter, be sure to eliminate the static charges first.
5.3 Disassembly Guide 5.3.1 Removing the Covers 1. As shown in the figure, rotate the battery door key for 90° to loose the lock pin that secures the battery door. Open the battery door and remove the batteries.
2. Remove the adjusting bracket. 3. Unscrew 2 M2X6 crosshead screws and 3 PT2X8 tapping screws. Separate the front panel from the rear cover with your hands. NOTE z Carefully separate the covers to avoid damage the wires and connectors.
5.3.2 Removing the Main Board To remove the main board, disconnect the speaker cable and the SpO2 communication. 5.3.3 Removing the Speaker and SpO2 Communication Cable Socket 1. Unscrew 3 PT2X8 tapping screws and remove the speaker.
2. Thrust the end of the SpO2 communication cable socket and push it out. 5.3.4 Removing the LCD Screen Pry the LCD screen at the top right corner with tweezers, disconnect the flexible cable socket and remove the LCD screen.
CAUTION z Do not touch the LCD screen. z Disassemble the LCD screen in an environment as dust-free as possible. 5.3.5 Remove the Screen Mount Use sharp-nose pliers to straighten the three clips that secure the screen mount to the main board. Remove the screen mount.
6 Parts 6.1 Introduction This chapter contains the exploded views and parts lists of the pulse oximeter. It helps the service personnel to identify the parts during disassembling the pulse oximeter and replacing the parts.
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10 0852-20-77419 Leaf 2 1 11 0852-20-77418 Leaf 1 1 12 0850-20-30704 SpO2/Communication cable socket 1 6.7 Replacement Parts To replace the parts, refer to 5 Repair and Disassembly and the exploded views in this chapter. NOTE z In the list below, we list most of the replacement parts. Contact our Customer Service Department for more replacement parts.
P/N：0852-20-77475（1.
