About this Manual P/N: 01.54.20094-16 Release Date: July 2011 © Copyright EDAN INSTRUMENTS, INC. 2005-2011. All rights reserved.
Statement This manual will help you understand the operation and maintenance of the product better. It is reminded that the product shall be used strictly complying with this manual. User’s operation failing to comply with this manual may result in malfunction or accident for which EDAN INSTRUMENTS, INC. (hereinafter called EDAN) can not be held liable. EDAN owns the copyrights of this manual. Without prior written consent of EDAN, any materials contained in this manual shall not be photocopied, reproduced or translated into other languages. Materials protected by the copyright law, including but not limited to confidential information such as technical information and patent information are contained in this manual, the user shall not disclose such information to any irrelevant third party. The user shall understand that nothing in this manual grants him, expressly or implicitly, any right or license to use any of the intellectual properties of EDAN. EDAN holds the rights to modify, update, and ultimately explain this manual.
Responsibility of the Manufacturer EDAN only considers itself responsible for any effect on safety, reliability and performance of the equipment if: Assembly operations, extensions, re-adjustments, modifications or repairs are carried out by persons authorized by EDAN, and The electrical installation of the relevant room complies with national standards, and The instrument is used in accordance with the instructions for use. Upon request, EDAN may provide, with compensation, necessary circuit diagrams, and other information to help qualified technician to maintain and repair some parts, which EDAN may define as user serviceable.
I
Terms Used in this Manual This guide is designed to give key concepts on safety precautions. WARNING A WARNING label advises against certain actions or situations that could result in personal injury or death. CAUTION A CAUTION label advises against actions or situations that could damage equipment, produce inaccurate data, or invalidate a procedure. NOTE A NOTE provides useful information regarding a function or a procedure.
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Table of Contents Chapter 1 Warranty and Service.................................................................................................. 1 Chapter 2 Safety Guidance ........................................................................................................... 4 2.1 List of Symbols....................................................................................................................... 4 2.2 Safety Information.................................................................................................................. 6 2.3 Warnings and Cautions ........................................................................................................... 7 2.3.1 Safety Warnings ............................................................................................................... 8 2.3.2 Lithium Battery Care Warnings ....................................................................................... 9 2.3.3 General Cautions............................................................................................................ 10 2.3.4 Cleaning and Disinfection Cautions............................................................................... 12 Chapter 3 Operating Principle ................................................................................................... 13 3.1 Basic Theory of ECG Operation........................................................................................... 13 3.2 Composition of ECG ............................................................................................................ 13 3.3 Lead ...................................................................................................................................... 14 3.4 Description of Hardware Design Principle........................................................................... 16 3.4.1 ECG Board Description ................................................................................................. 18 3.4.2 Description of Main Control Part................................................................................... 19 3.4.3 Description of Power Control Part................................................................................. 20 Chapter 4 Functional Verification .............................................................................................. 21 4.1 System Tests ......................................................................................................................... 21 4.2 Application System Tests...................................................................................................... 21 4.3 Safety Tests ........................................................................................................................... 23 Chapter 5 Modules’ Malfunction Verification........................................................................... 24 5.1 Verifying the Main Board ..................................................................................................... 24 5.2 Verifying the ECG Board...................................................................................................... 25 Chapter 6 Electrocardiograph Servicing ................................................................................... 27 6.1 Disassembly Steps ................................................................................................................ 27 6.2 Internal Boards and Interfaces.............................................................................................. 34 6.3 Troubleshooting .................................................................................................................... 42 Chapter 7 Cleaning, Care and Maintenance ............................................................................. 46 7.1 Cleaning................................................................................................................................ 46 7.1.1 Cleaning the Main Unit and the Patient Cable............................................................... 46 7.1.2 Cleaning the Electrodes.................................................................................................. 46 7.1.3 Cleaning the Print Head ................................................................................................. 46 III
7.2 Disinfection .......................................................................................................................... 47 7.3 Care and Maintenance .......................................................................................................... 47 7.3.1 Recharge and Replacement of Battery ........................................................................... 47 7.3.2 Recorder Paper ............................................................................................................... 48 7.3.3 Maintenance of Main Unit, Patient Cable and Electrodes ............................................. 49 Chapter 8 Renewal Parts............................................................................................................. 51
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SE-3 Electrocardiograph Service Manual
Warranty and Service
Chapter 1 Warranty and Service Standard Service EDAN provides a one-year-warranty for the warranted products (accessories are included). The warranty period begins on the date the products are shipped to customers. If a customer promptly notifies EDAN of customer’s warranty claim hereunder, EDAN will either repair, adjust or replace (with new or exchange replacement parts) EDAN’s products. EDAN warrants that any service it provides to customers will be performed by trained individuals in a workmanlike manner. Limitation of Warranty Direct, indirect or final damage and delay caused by the following situations for which EDAN is not responsible may void the warranty: Groupware is dismounted, stretched or redebugged. Unauthorized modification or misuse. Damage caused by operating beyond the environmental specifications for the medical product. Change or remove the original serial number label or the manufacturer symbol. Improper use. Service Procedure (1) Fill in the Service Claim Form (SCF). Fill in the SCF with detailed information including: Model Name, Serial Number (SN) and Problem Phenomena. EDAN should not have any obligation to take over the case without this information. The form can be downloaded at: http://www.edan.com.cn or obtained from EDAN’s service department. (2) Send EDAN the SCF and Select a Solution. Once the service department receives the fully filled SCF, EDAN’s engineer will offer a solution in three working days. EDAN will follow out the case based on the two conditions below: -1-
SE-3 Electrocardiograph Service Manual
Warranty and Service
Within Warranty: There are two options: i) After receiving the Return Material Authorization (RMA) form from EDAN service department, the customer sends EDAN the defective parts and informs about the shipment tracking number. Then we will dispatch new part(s) to your confirmed address with the confirmed shipping invoice. ii) The customer signs the Declaration Form and sends it back by email or fax. This form is legally certificated to make sure the customer or the end-user will return the defective parts to EDAN on time. We will, at this option, dispatch the replacement one(s) with the confirmed shipping invoice. NOTE: (1) Both Return Material Authorization Form and Declaration Form are offered by EDAN service department once the SCF is confirmed by service engineers. (2) The customer is responsible for freight & insurance charges when the equipment is shipped to EDAN for service, including custom charges. EDAN is responsible for the freight, insurance & custom charges from EDAN to the customer. Out of Warranty: After receiving the RMA form from the service department, the customer sends defective parts to EDAN in advance. We will analyze the problems and discuss with the customer about either repairing or replacing the part(s). Once the maintenance fee is invoiced and paid, we will make sure to dispatch good part(s) to the confirmed address. NOTE: The customer is responsible for any freight & insurance charge for the returned product. (3) Obtain the RMA Form. Before the shipment of the materials, the customer must obtain an RMA form from our service department, in which the RMA number, description of returning parts and shipping instructions are included. The RMA number should be indicated on the outside of the shipping container. -2-
SE-3 Electrocardiograph Service Manual
Warranty and Service
NOTE: EDAN should not have any obligation to the end-user or the customer who returns the goods without the notification by EDAN’s service department. The sender takes full responsibility for the accounted fee.
(4) Send the Parts to EDAN. Follow these recommended instructions: Please disassemble the parts with anti-static facility, do not touch the parts with naked hands. Please pack the parts safely before return. Please put the RMA number on the parcel. Please describe the returned parts as ‘sample of *****’ and put the total value on the invoice, and note on the invoice as ‘sample, no commercial value’. Please confirm the invoice with Edan before shipment. Please send back the parts after Edan’s confirmation. Contact Information If you have any question about maintenance, technical specifications or malfunctions of devices, do not hesitate to contact us. EDAN Instruments, Inc. TEL: +86-755-26898321, 26899221 FAX: +86-755-26882223, 26898330 E-mail:
[email protected]
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SE-3 Electrocardiograph Service Manual
Safety Guidance
Chapter 2 Safety Guidance This chapter describes important issues related to safely servicing SE-3. The service provider must read and understand all the information presented in this manual before servicing a unit.
2.1 List of Symbols External output
External input
Equipment or part of CF type with defibrillator proof
Caution
Consult Instructions for Use
Potential equalization
Mains supply
On (mains supply)
Off (mains supply)
Battery indicator
Battery recharging indicator
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SE-3 Electrocardiograph Service Manual
Safety Guidance
Sensitivity switch key
Recall key
1mV calibration key & Copy key
Mode/RST switch key
Lead switch key
Print/Stop key
ON/OFF key
Menu key
Up arrow/Down arrow key
Left arrow/ Right arrow key
Recycle
Part Number
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SE-3 Electrocardiograph Service Manual
Safety Guidance
Serial Number
Date of Manufacture
Manufacturer
Authorized Representative in the European Community The symbol indicates that the device complies with the European Council Directive 93/42/EEC concerning medical devices. The symbol indicates that the device should be sent to the special agencies according to local regulations for separate collection after its useful life. Rx only (U.S.)
Federal (U.S.) law restricts this device to sale by or on the order of a physician
2.2 Safety Information Safety Standard: IEC/EN 60601-1+A1+A2, IEC/EN 60601-1-2+A1, IEC/EN60601-2-25, ANSI/AAMI EC-11 Classification: Anti-electric-shock type:
Class І with internal power supply
Anti-electric-shock degree:
Type CF
Degree of protection against harmful ingress of water:
Ordinary equipment (Sealed equipment without liquid proof)
Disinfection/sterilization method:
Refer to the user manual for details
Degree of safety of application in the
Equipment not suitable for use in the presence -6-
SE-3 Electrocardiograph Service Manual
Safety Guidance
presence of flammable gas:
of flammable gas
Working mode:
Continuous operation
EMC:
Group І, Class A
Environment:
Temperature: Relative Humidity: Atmospheric Pressure:
Transport & Storage
Working
-20 ºC ~ +55 ºC
5 ºC ~ 40 ºC
25% ~ 93%
25% ~ 80%
Non-Condensing
Non-Condensing
700hPa ~ 1060hPa
860hPa ~ 1060hPa
Power Supply Specifications: 1) Mains Supply: Operating Voltage: 100V-115V~ / 220V-240V~ Operating Frequency: 50Hz/60Hz Input Power: 35VA 2) Built-in Rechargeable Lithium Battery Pack: Rated voltage: 14.8V; Rated capacity: 2200mAh 3) Power Consumption: 35VA (max) 4) Fuse Specification: T400mA 250V Ø5×20 / T200mA 250V Ø5×20
2.3 Warnings and Cautions In order to service the system safely and effectively, and avoid the possibility of injury, please read the user manual and this service manual in detail and be sure to be familiar with proper service methods. The following precautions must be paid more attention to during the service procedure. Note: 1. This device is not intended for home use. 2. The pictures and interfaces in this manual are for reference only.
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SE-3 Electrocardiograph Service Manual
Safety Guidance
2.3.1 Safety Warnings WARNING 1. The service provider must read and understand all the information presented in the user manual and this service manual before installing or servicing a unit. 2. Only qualified service engineers can install this equipment, and only service engineers authorized by the manufacturer can open the shell. 3. Only qualified installation or service engineers can shift the mains supply shift switch (100V-115V/220V-240V) according to local mains supply specifications. 4. This device is not intended for treatment or monitoring. 5. EXPLOSION HAZARD - Do not use the electrocardiograph in the presence of flammable anesthetic mixtures with oxygen or other flammable agents. 6. SHOCK HAZARD - The power receptacle must be a hospital grade grounded outlet. Never try to adapt the three-prong plug to fit a two-slot outlet. 7. If the integrity of the external protective conductor is in doubt, the equipment should be operated by using the built-in rechargeable battery. 8. Do not use this equipment in the presence of high static electricity or high voltage equipment which may generate sparks. 9. Only the patient cable and other accessories supplied by the manufacturer can be used. Or else, the performance and electric shock protection can not be guaranteed. 10.Ensure that the conductive parts of electrodes and associated connectors, including neutral electrodes, do not come in contact with earth or any other conducting objects. 11.Electrodes with defibrillator protection should be used during defibrillation. To avoid a polarization or DC offset voltage, use non-polarizing electrodes (which will not form a DC offset voltage when subjected to a DC current) such as silver/silver-chloride types if there is a situation where there is a likelihood that a defibrillation procedure will be necessary. 12.Do not touch the patient, bed, table or the equipment while using the ECG together with a defibrillator.
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SE-3 Electrocardiograph Service Manual
Safety Guidance
WARNING 13.In order to avoid being burned, please keep the electrodes far away from the radio knife while using electrosurgical equipment. 14.If reusable electrodes with electrode gel are used during defibrillation, ECG recovery will take more than 10 seconds. The manufacturer recommends the use of disposable electrodes at all times. 15.Accessory equipment connected to the analog and digital interfaces must be certified according to the respective IEC/EN standards (e.g. IEC/EN 60950 for data processing equipment and IEC/EN 60601-1 for medical equipment). Furthermore all configuration shall comply with the valid version of the standard IEC/EN 60601-1-1. Therefore anybody, who connects additional equipment to the signal input or output connector to configure a medical system, must make sure that it complies with the requirements of the valid version of the system standard IEC/EN 60601-1-1. If in doubt, consult our technical service department or your local distributor. 16.The summation of leakage current should never exceed leakage current limits while several other units are used at the same time; otherwise, electric shock may happen. 17.The potential equalization conductor can be connected to that of other equipment when necessary. Make sure that all these devices are connected to the potential equalization bus bar of the electrical installation. 18.We recommend that the electrocardiograph should be working on AC power supply at least 8 hours per month to avoid DATE&TIME missing.
2.3.2 Lithium Battery Care Warnings WARNING 1. Improper operation may cause lithium battery (hereinafter called battery) to be hot, ignited or exploded, and it may lead to the declination of the battery capacity. It is necessary to read the user manual carefully and pay more attention to warning messages. 2. Only qualified service engineers authorized by the manufacturer can open the battery compartment and replace the battery. The battery of the same model and specification provided by the manufacturer should be used.
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SE-3 Electrocardiograph Service Manual
Safety Guidance
WARNING 3. Danger of explosion -- Do not reverse the anode and the cathode when installing the battery. 4. Do not heat or splash the battery or throw it into fire or water. 5. When leakage or foul smell is found, stop using the battery immediately. If your skin or cloth comes into contact with the leakage liquid, cleanse it with clean water at once. If the leakage liquid splashes into your eyes, do not wipe them. Irrigate them with clean water first and go to see a doctor immediately. 6. Remove the battery from the electrocardiograph when the electrocardiograph is not used for a long time. 7. If the battery is stored alone and not used for a long time, we recommend that the battery should be charged at least once every 6 months to prevent overdischarge.
2.3.3 General Cautions CAUTION 1. Avoid liquid splash and excessive temperature. The temperature must be kept between 5 ºC and 40 ºC during operation, and it should be kept between -20 ºC and 55 ºC during transportation and storage. 2. Do not use the equipment in a dusty environment with bad ventilation or in the presence of corrosive. 3. Make sure that there is no intense electromagnetic interference source around the equipment, such as radio transmitters, mobile phones etc. Attention: large medical electrical equipment such as electrosurgical equipment, radiological equipment and magnetic resonance imaging equipment is likely to bring electromagnetic interference. 4. Before use, the equipment, the patient cable and electrodes should be checked. Replacement should be taken if there is any evident defectiveness or aging symptom which may impair the safety or the performance. 5. The following safety checks should be performed at least every 24 months by a qualified person who has adequate training, knowledge, and practical experience to perform these tests.
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SE-3 Electrocardiograph Service Manual
Safety Guidance
CAUTION a) Inspect the equipment and accessories for mechanical and functional damage. b) Inspect the safety related labels for legibility. c) Inspect the fuse to verify compliance with the rated current and breaking characteristics. d) Verify that the device functions properly as described in the instructions for use. e) Test the protection earth resistance according to IEC/EN 60601-1: Limit 0.1 ohm. f) Test the earth leakage current according to IEC/EN 60601-1: Limit: NC 500 μA, SFC 1000μA. g) Test the enclosure leakage current according to IEC/EN 60601-1: Limit: NC 100μA, SFC 500μA. h) Test the patient leakage current according to IEC/EN 60601-1: Limit: NC a.c. 10μA, d.c. 10μA; SFC a.c. 50μA, d.c. 50μA. i) Test the patient auxiliary current according to IEC/EN 60601-1: Limit: NC a.c. 10μA, d.c. 10μA; SFC a.c. 50μA, d.c. 50μA. j) Test the patient leakage current under single fault condition with mains voltage on the applied part according to IEC/EN 60601-1: Limit: 50μA (CF). The data should be recorded in an equipment log. If the device is not functioning properly or fails any of the above tests, the device has to be repaired. 6. Ruptured fuses must only be replaced with those of the same type and rating as the original. 7. The device and accessories are to be disposed of according to local regulations after their useful lives. Alternatively, they can be returned to the dealer or the manufacturer for recycling or proper disposal. Batteries are hazardous waste. Do not dispose of them together with house-hold garbage. At the end of their lives hand the batteries over to the applicable collection points for the recycling of waste batteries. For more detailed information about recycling of this product or the battery, please contact your local Civic Office, or the shop where you purchased the product. 8. Federal (U.S.) law restricts this device to sale by or on the order of a physician.
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SE-3 Electrocardiograph Service Manual
Safety Guidance
2.3.4 Cleaning and Disinfection Cautions CAUTION 1. Turn off the power before cleaning and disinfection. If the mains supply is used, the power cord should be dragged out of the outlet. Prevent the detergent from seeping into the equipment during cleaning. 2. Do not immerse the unit or the patient cable into liquid under any circumstances. 3. Do not clean the unit and accessories with abrasive fabric and avoid scratching the electrodes. 4. Any remainder of detergent should be removed from the unit and the patient cable after cleaning. 5. Do not use chloric disinfectant such as chloride, sodium hypochlorite etc.
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SE-3 Electrocardiograph Service Manual
Operating Principle
Chapter 3 Operating Principle This chapter describes the basic theory and the internal circuit structure of SE-3 to let the service provider understand the operating principle.
3.1 Basic Theory of ECG Operation The heart is a power organ of the blood circulation. Before the systole or the diastole, a cardiac impulse happens in the heart muscle, and a faint bioelectric signal is thus generated. The bioelectric signal is transmitted through the whole body, and the potential difference is generated on the different skin surfaces because of the different distances from the heart. The cardiogram is a record of the amplification of the potential distribution on the body skin surface. The potential difference is sampled by the electrodes, and amplified and processed by the electrocardiograph. Then it is recorded on the paper. The cardiogram recorded by the electrocardiograph can help doctors to analyze and diagnose heart disease. The intended use of the electrocardiograph is to acquire ECG signals from adult and pediatric patients through body surface ECG electrodes. The electrocardiograph only records the heart's electrical activity, and does not produce any electricity of its own. The test does not hurt and has no known side effects. It does not require any preparations except possibly shaving chest hair to get a better recording. The recording itself takes only a few seconds. It is more than one hundred years since the electrocardiograph was applied in clinical diagnosis. The electrocardiograph is an important measurement in clinical diagnosis of heart disease, and is equipped in almost every hospital and clinic.
3.2 Composition of ECG The standard 12-lead electrocardiogram is a representation of the heart's electrical activity recorded from electrodes on the body surface. A normal ECG wave consists of a P wave, a QRS complex, an ST segment, a T wave and a U wave. In the following figure, the x-axis indicates time and y-axis indicates voltage. When the recording speed is 25mm/s and the sensitivity is 10mm/mV, one small grid on x-axis represents 0.04 seconds, and one small grid on y-axis represents 0.1mV. This diagram illustrates ECG waves and intervals as well as standard time and voltage measures on the ECG paper.
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SE-3 Electrocardiograph Service Manual
Operating Principle
Figure 3-1 Composition of ECG
P wave: the sequential activation (depolarization) of the right and left atria QRS complex: the right and left ventricular depolarization (normally the ventricles are activated simultaneously) ST-T wave: the ventricular repolarization U wave: the origin of this wave is not clear - but probably represents "after-depolarization" in the ventricles. PR interval: the interval from the onset of the atrial depolarization (P wave) to the onset of the ventricular depolarization (QRS complex) QRS duration: the duration of the ventricular muscle depolarization QT interval: the duration of the ventricular depolarization and repolarization RR interval: the duration of the ventricular cardiac cycle (an indicator of the ventricular rate) PP interval: the duration of the atrial cycle (an indicator of the atrial rate)
3.3 Lead The 12-lead ECG provides spatial information about the heart's electrical activity in three approximately orthogonal directions. Right
Left
Superior
Inferior
Anterior
Posterior
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SE-3 Electrocardiograph Service Manual
Operating Principle
Each lead represents a particular orientation in space, as indicated below (RA = Right Arm, LA = Left Arm, LL = Left Leg): Bipolar limb leads (frontal plane): Lead I: RA (-) to LA (+) (right left, or lateral) Lead II: RA (-) to LL (+) (superior inferior) Lead III: LA (-) to LL (+) (superior inferior) Augmented unipolar limb leads (frontal plane): Lead aVR: RA (+) to [LA & LL] (-) (rightward) Lead aVL: LA (+) to [RA & LL] (-) (leftward) Lead aVF: LL (+) to [RA & LA] (-) (inferior) Unipolar (+) chest leads (horizontal plane): Leads V1, V2, V3: (posterior anterior) Leads V4, V5, V6: (right left, or lateral)
Figure 3-2 Standard Limb Leads
RA: Right arm LA: Left arm LL: Left leg V1: Fourth intercostal space at the right border of the sternum V2: Fourth intercostal space at the left border of the sternum V3: Fifth rib between V2 and V4 - 15 -
SE-3 Electrocardiograph Service Manual
Operating Principle
V4: Fifth intercostal space on the left midclavicular line V5: Left anterior axillary line at the horizontal level of V4 V6: Left midaxillary line at the horizontal level of V5
Figure 3-3 Chest Electrode of the Standard Limb Leads
3.4 Description of Hardware Design Principle SE-3 consists of the following functional blocks: 1)
Key panel for user input;
2)
Front end module including the signal acquisition, digital filter and amplifier;
3)
Main board: ARM9 and peripheral module;
4)
Thermal printer module;
5)
LCD display module;
6)
Power supply module.
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SE-3 Electrocardiograph Service Manual
Operating Principle
Figure 3-4 SE-3 Block Diagram
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SE-3 Electrocardiograph Service Manual
Operating Principle
3.4.1 ECG Board Description
Figure 3-5 Block Diagram of the ECG Board Circuit
This module is a sampling and processing module of 12-channel ECG signals. It can amplify and preprocess ECG signals in every channel, detect lead situations, and send data to ARM9 MCU. This module is connected to ARM9 MCU through the UART port. The electrocardiograph has 10 lead cables. Nine lead cables input ECG signals and one right foot lead cable provides the float ground. The ECG signals pass through the defibrillator protection circuit, the buffering circuit (U1~U3), and enter the difference amplifier circuit. Then they continue to pass through the pacemaker pulse restraining, high-pass filter, low-pass filter, channel switch, second level amplification, and enter the A/D sampling port. Because the ECG system must meet the safety requirement of the photo-electricity isolation, the serial signals will be sent to the photo-electricity component.
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SE-3 Electrocardiograph Service Manual
Operating Principle
3.4.2 Description of Main Control Part The main control part is SE-3 main board, which is divided into two parts (the ARM9 circuit and the interface circuit). The ARM9 circuit consists of MCU S3C2410, SDRAM, NAND FLASH, NOR FLASH, LAN controller, CPLD etc. The main frequency is 203MHz. The interface circuit consists of the RS232 interface, LAN interface, USB interface, printer interface, LCD interface, key panel interface etc. It also provides power supply to the device.
Figure 3-6 Block Diagram of the ARM9 Circuit
The system uses ARM9 (S3C2410) (U1) as the control MCU, and the peripheral equipment is connected to the MCU ports. The MCU controls the peripheral equipment in several kinds of ways. The system expands 64M external SDRAM (U10, U11), 8M NOR FLASH (U12, U13), 64M FLASH (U3), LAN Controller (U15) and CPLD (U14). The interface circuit integrates all sockets for USB, Ethernet, input/output, RS232 and thermal printer. The main control circuits include the paper detection circuit (U25), the motor driving circuit (U22, U23, U56) and the heat time control circuit (U14, the CPLD). The external analog input is connected to MCU by U28. The thermal recorder has the step motor and the transmission frame of its own. The paper detection is carried out by using a photoelectric diode. The key panel uses membrane keys, and the key panel control component uses 3×4 matrixes. There are 12 keys in total. SE-3 (192×64 LCD screen) adopts 8 bit bus interface. The main board uses 8 GPIO to simulate 8 bit buses to control the reading and writing of the LCD screen. SE-3 (320×240 LCD screen) adopts the standard FSTN interface. Because ARM9 has the FSTN interface of its own, it can be driven directly after connected. - 19 -
SE-3 Electrocardiograph Service Manual
Operating Principle
3.4.3 Description of Power Control Part The AC voltage passes the linear transformer and is transformed into 20V AC voltage. One part is provided to charge the battery, and the other part passes DC/DC to provide +8V for the thermal print head, +5V for the electric machine, and +5V for the main board and the ECG board.
Figure 3-7 Block Diagram of the Power Supply Module Circuit
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SE-3 Electrocardiograph Service Manual
Functional Verification
Chapter 4 Functional Verification This chapter describes the procedure of a complete functional test to support recommended preventive maintenance schedules. Functional verification does not require opening the device case. WARNING Only qualified service personnel should perform a full functional checkout procedure. Whenever the electrocardiograph is serviced or problems are suspected, the manufacturer recommends a functional test.
4.1 System Tests 1. Unit Appearance and Assembly Examinations 1) Clean appearance, firm assembly, no remainder in the unit when it is shaken. 2) Keys feel good when pressed. 3) Labels are complete and correct. 4) Standard configuration is complete. Sockets are installed firmly. 5) The vibration test should be done before the following tests are performed. 2. Switching On the Electrocardiograph After turned on, the electrocardiograph runs well and the LCD screen displays well.
4.2 Application System Tests 1. Equipment Requirement Equipment
Model
ECG simulator
FLUKE MPS450
ECG detector
NMI EGC-1C
2. LCD Screen Tests Observe whether some characters are missing, or there are bright spots and dark shadows on the LCD screen. Observe whether the waveforms, fonts and symbols displayed on the LCD screen are normal.
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SE-3 Electrocardiograph Service Manual
Functional Verification
3. Lead Off Tests In the AUTO mode, when the lead cables are pulled out from or inserted into the ECG simulator in sequence, the electrocardiograph will accurately identify the disconnection or the connection of the corresponding lead cable. 4. Key Tests Press every key on the key panel to test whether they work as described in the user manual. 5. System Setup Tests Press the MEMU key to open the system setup interface. Set DEFAULT SETTING to RESTORE. Then set the current examination time. Turn off the electrocardiograph, and turn it on five seconds later. When the electrocardiograph is ready for examination, observe whether the time displayed on the LCD screen is the current time, and open the system setup interface to see whether the items keep the default options. Then change some items and exit. Turn off the electrocardiograph. Five seconds later, turn on the electrocardiograph again. When the electrocardiograph is ready for examination, observe whether the items keep the changed options. 6. Heart Rate Display Tests Set the heart rate output from the ECG simulator to different values, and the error of the heart rate values displayed on the LCD screen of the electrocardiograph should be within ±1bpm. 7. Recording Tests 1) Set the following values: The heart rate output from the ECG simulator is 80bpm, the printing mode of the electrocardiograph is set to AUTO, the speed is set to 25mm/s, AC FILTER and EMG FILTER are set to off, LOWPASS FILTER is set to 150Hz and all the options on the record setting interface are on. Install the recorder paper and press the PRINT/STOP key to begin to print ECG reports. Examine whether the printed contents are integrated and consistent with the information displayed on the LCD screen. 2) Make the ECG detector output sine waves with the amplitude of 2mV and the frequency of 10Hz. Press the PRINT/STOP key to begin to print ECG reports. Examine whether the printed contents are integrated and consistent with the information displayed on the LCD screen. The amplitude of the ECG waveform of lead I should be 20mm. 3) The ECG report includes date and time, ID, name, sex, age, sensitivity, paper speed, filter, lead, 1mV calibration mark, ECG waveform, heart rate etc. 1mV calibration mark and lead names are printed before ECG waves in the ECG reports. The printed characters and waveforms are clear. 4) Open the recorder casing and remove the recorder paper, and then the hint information Paper? should be displayed. Install the recorder paper again and close the recorder casing, and then the hint information Paper? should disappear. - 22 -
SE-3 Electrocardiograph Service Manual
Functional Verification
4.3 Safety Tests 1) Test the protection earth resistance according to IEC/EN 60601-1: Limit: 0.1 ohm. 2) Test the earth leakage current according to IEC/EN 60601-1: Limit: NC 500 μA, SFC 1000μA. 3) Test the enclosure leakage current according to IEC/EN 60601-1: Limit: NC 100μA, SFC 500μA. 4) Test the patient leakage current according to IEC/EN 60601-1: Limit: NC a.c. 10μA, d.c. 10μA; SFC a.c. 50μA, d.c. 50μA. 5) Test the patient auxiliary current according to IEC/EN 60601-1: Limit: NC a.c. 10μA, d.c. 10μA; SFC a.c. 50μA, d.c. 50μA. 6) Test the patient leakage current under single fault condition with mains voltage on the applied part according to IEC/EN 60601-1: Limit: 50μA (CF).
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SE-3 Electrocardiograph Service Manual
Modules’ Malfunction Verification
Chapter 5 Modules’ Malfunction Verification When a module is suspected of malfunction, the verification methods are described in this chapter.
5.1 Verifying the Main Board To verify the main board, 1) Open the main unit following the procedures described in Section 6.1, “Disassembly Steps”. 2) Switch on the device. 3) Measure the voltage to earth of the test points listed below by using a multimeter. Item
Test point
Reference result
①
T3
18V~24V
②
T5
+5V±0.25V
③
T7
+5V±0.25V
④
T2
18V~24V
⑤
T6
+5V±0.25V
⑥
T4
+8V±0.5V
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SE-3 Electrocardiograph Service Manual ① T3
④ T2
② T5
⑤ T6
Modules’ Malfunction Verification
③ T7
⑥ T4
4) Compare the measurement results with the reference results in the list. If any one of the results exceeds the reference range, the main board defection is confirmed. Replacement of the main board is recommended.
5.2 Verifying the ECG Board To verify the ECG board, 1) Make sure that the malfunction of ECG measurement is not caused by other defects, such as defective connection, inoperative electrodes or main board, etc. 2) Open the main unit following the procedures described in Section 6.1, “Disassembly Steps”.
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SE-3 Electrocardiograph Service Manual
Modules’ Malfunction Verification
3) Switch on the device. 4) Measure the voltage to earth of the test points listed below by using a multimeter. Item
Test Point
Reference Result
①
-VCC
≤-7.5V
②
+VCC
≥7.5V
③
+5V
5.0V±0.15V
④
+3.3V
3.3V±0.1V
⑤
GND
0V
⑥
+2.5V
2.5V±0.05V
①-VCC
②+VCC
⑥+2.5V
③+5V ④+3.3V ⑤GND
5) Compare the measurement results with the reference results in the list. If any one of the results exceeds the reference range, the ECG board defection is confirmed. Replacement of the ECG board is recommended. - 26 -
SE-3 Electrocardiograph Service Manual
Electrocardiograph Servicing
Chapter 6 Electrocardiograph Servicing This chapter describes the electrocardiograph servicing, including disassembly steps, internal boards and troubleshooting.
6.1 Disassembly Steps 1. Main Unit
2. Disassembly Steps of the Main Unit Remove the crosshead screws ① (M3×10) on the bottom of the electrocardiograph. Open the upper unit ③ and remove the cables between the upper and lower units, and then separate the upper unit from the lower unit. In the following pictures, ② is the lower unit, ④ is the recorder casing.
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SE-3 Electrocardiograph Service Manual
Electrocardiograph Servicing
①
There are two fuses of the same specifications installed on the bottom of the main unit. The specifications are shown on the fuse label: AC220V-240V: T200mA; AC100V-115V: T400mA; Φ5×20.
WARNING Ruptured fuses must only be replaced with those of the same type and rating as the original.
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SE-3 Electrocardiograph Service Manual
Electrocardiograph Servicing
Figure 6-1 Lower Unit
3. Disassembly Steps of the Upper Unit (192×64 Dot Single Color LCD Screen) Note: You should take care not to damage the LCD screen when disassembling it. The upper unit of the electrocardiograph (192×64 dot single color LCD screen) includes the lower casing of the displaying box, filmy switch panel, LCD screen, rotation base etc. The disassembly steps: Remove the cables among the LCD screen ⑩, key panel ⑨ and transfer board ②. → Remove the five crosshead panhead screws ① (M3×6), and dismantle the transfer board ② → Remove the four crosshead panhead screws ⑤ (M3×8), and dismantle the upper casing of the displaying box to show the LCD screen ⑩ and the rotation base ④ fixed on the lower casing of the displaying box. → Remove the screws used to fix the LCD screen and dismantle the LCD screen. → Remove the two crosshead sunk screws ⑧ (M3×20) to dismantle the lower casing of the displaying box ⑥ → Remove the four crosshead sunk screws ⑦ (M3×6) to dismantle the rotation base ④. and the key panel ⑨ are stuck to the upper unit ③, and can be torn off. The label
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SE-3 Electrocardiograph Service Manual
Electrocardiograph Servicing
4. Disassembly Steps of the Upper Unit (320×240 Dot Single Color LCD Screen) Note: You should take care not to damage the LCD screen when disassembling it. The LCD screen (320×240 dot single color LCD screen) is embedded in the upper casing of the displaying box, while the LCD screen (192×64 dot single color LCD screen) is fixed in the lower casing of the displaying box by using screws. The following picture shows: ① crosshead panhead screws M3×6, ② the transfer board, ③ the upper unit, ④ the rotation base, ⑤ crosshead panhead screws M3×8, ⑥ the lower casing of the displaying box, ⑦ crosshead sunk screws M3×6, ⑧ crosshead sunk screws M3×20, ⑨ the LCD screen, ⑩ the filmy switch panel, the upper casing of the displaying box, the label, the protection screen.
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SE-3 Electrocardiograph Service Manual
Electrocardiograph Servicing
5. Disassembly Steps of the Lower Unit Remove the cables between two parts before disassembly. Remove the screws on the ECG board ⑦ and dismantle the ECG board. Remove the main board ⑧ which is embedded in the groove of the lower unit. Remove the two crosshead panhead screws ④ (M2×6) and dismantle the print head ③. Remove the four crosshead sunk screws ② (M3×6) and dismantle the print bracket ①. Remove crosshead panhead screws ⑥ (M3×8) and dismantle the transformer ⑤. ⑨ is the power transition board.
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SE-3 Electrocardiograph Service Manual
Electrocardiograph Servicing
⑥
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SE-3 Electrocardiograph Service Manual
Electrocardiograph Servicing
④ Remove the screws on the main board.
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SE-3 Electrocardiograph Service Manual
Electrocardiograph Servicing
Net
Chip
(Optional)
6.2 Internal Boards and Interfaces 1. ECG Board -- Receiving and Processing ECG Signals
①
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SE-3 Electrocardiograph Service Manual
Electrocardiograph Servicing
① P2-- Socket connected to the main board
Pin
Description
Pin
Description
1
Digital signal (output)
2
GND
3
RxD (input)
4
TxD (output)
5
+5V
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SE-3 Electrocardiograph Service Manual
Electrocardiograph Servicing
2. SE-3 Main Board -- Integrating Power Supply, Input/Output Interfaces and ARM9 Circuit
①
⑤ ③ ④
②
①
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SE-3 Electrocardiograph Service Manual
Electrocardiograph Servicing
① J7-- connected to the transformer. Pin
Description
1, 2
16.8V AC INPUT
② J8 -- connected to the printer Pin
Description
6, 7, 25, 26
+8V
2
+5V
15
+3.3V
24
N.C
5, 10, 11, 19, 20, 21, 22
GND
27, 28, 29, 30
Motor driving signal
Others
Signal port of thermal print head
③ J9 -- connected to BP3 of the connecting board (Only for the ECG with narrow screen) Pin
Description
4, 40
+5V
3, 22, 27, 34, 35
GND
5 ~ 21
LCD control signal
25, 26, 28 ~ 33
Key panel signal
36~39
LED indication signal
Others
N.C
④ J10 -- connected to BP3 of the connecting board (Only for the ECG with wide screen) Pin
Description
1 ~ 9, 13, 14
LCD control signal
11, 21, 27, 34, 35
GND
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SE-3 Electrocardiograph Service Manual
Electrocardiograph Servicing
10, 40
+3.3V
25, 26, 28 ~ 33
Key panel signal
20
LCD backlight
36~39
LED indication signal
Others
N.C
⑤ J15 -- connected to J2 of the ECG-12 board/J4 of the DE12 board Pin
Description
1
Enable
2
GND
3, 4
UART Signal
5
+5V
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SE-3 Electrocardiograph Service Manual
Electrocardiograph Servicing
⑥
⑥ J11 -- connected to the Li-ion Battery Pin
Description
1
Battery supply
2
Battery detecting
3
GND
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SE-3 Electrocardiograph Service Manual
Electrocardiograph Servicing
3. ARM9 Circuit -- LCD display control, data process, ECG analysis
4. Connecting Board
① P1
② BP2
③ BP3
① BP1 -- connected to the LCD display Pin
Description
2
+5V
1, 20
GND
3~19
LCD control signal
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SE-3 Electrocardiograph Service Manual
Electrocardiograph Servicing
② BP2-- connected to key panel Pin
Description
1
ON/OFF
2
GND
Others
Key panel array signal
③ BP3-- connected to J9 of the main board (Only for the ECG with narrow screen) Pin
Description
4, 40
+5V
3, 22, 27, 34, 35
GND
5 ~ 21
LCD control signal
25, 26, 28 ~ 33
Key panel signal
36 ~ 39
LED indication signal
Others
N.C
③ BP3-- connected to J10 of the main board (Only for the ECG with wide screen) Pin
Description
1 ~ 9, 13, 14
LCD control signal
11, 21, 27, 34, 35
GND
10, 40
+3.3V
25, 26, 28 ~ 33
Key panel signal
20
LCD Backlight
36~39
LED indication signal
Others
N.C
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SE-3 Electrocardiograph Service Manual
Electrocardiograph Servicing
6.3 Troubleshooting WARNING Replace parts, components, or accessories only with parts supplied or approved by the manufacturer. The use of any other parts can lead to inferior device performance and will void the product warranty. This section describes some of the most common symptoms and provides possible causes and solutions to help you solve potential problems. When you encounter a problem, address the issue in the following order: 1. Review the troubleshooting section to see whether your issue is addressed. 2. Contact your local distributor. 3. Contact EDAN service department. EDAN service department can assist with product troubleshooting and provide technical expertise to help with any issues with SE-3. The troubleshooting section is for service engineers’ reference. 1. Troubles of the Main Unit Fault Symptoms
When the mains supply is used, you can not turn on the electrocardiograph.
When the battery is used, you can not turn on the electrocardiograph. The electrocardiograph fails to function.
Possible Causes ① Fuse failure ② Main board failure ③ Key panel failure ④ Transformer failure ⑤ Power transition board failure ⑥ Faulty mains supply shift switch ① Battery failure ② Main board failure ③ Key panel failure ① Strong interference of electric networks ② Main board failure ③ Faulty power supply of the ARM9 circuit - 42 -
Correction Actions ① Change the fuse ② Change the main board ③ Change the key panel ④ Change the transformer ⑤ Change the power transition board ⑥ Change the mains supply shift switch ① Change the battery ② Change the main board ③ Change the key panel ① Inspect the power supply and earthing system ② Change the main board ③ Change or repair the power supply
SE-3 Electrocardiograph Service Manual
Fuse is burned when you turn on the electrocardiograph.
Fuse is burned when it is connected to the voltage network.
Electrocardiograph Servicing
① The power supply or other components short-circuit. ① The set mains supply shift switch does not accord with local mains supply specifications. ② Rectifier failure ③ Transformer failure ④ Power transition board failure
① Open the electrocardiograph for further examination ① Set the mains supply shift switch according to local mains supply specifications ② Change the rectifier ③ Change the transformer ④ Change the power transition board
2. Display Troubles Fault Symptoms
Possible Causes
① LCD screen failure ② Faulty connecting wire of the upper and lower Some characters displayed on units the LCD screen are missing or ③ Faulty transition board mistaken. of the upper and lower units ④ Faulty transition board of the narrow screen ① The brightness of the main board is not adjusted The LCD screen is dark. well. ② LCD screen failure ③ Main board failure ① LCD screen failure After you turn on the machine, ② Transition board failure the LCD screen is white. ③ Program running failure
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Correction Actions
① Change the LCD screen ② Change the connecting wire ③ Change the transition board of the upper and lower units ④ Change the transition board of the narrow screen ① Adjust the adjustable transformer VR1 on the main board ② Change the LCD screen ③ Change the main board ① Change the LCD screen ② Change the transition board ③ Reload the program
SE-3 Electrocardiograph Service Manual
Electrocardiograph Servicing
3. Transmission Troubles Fault Symptoms
Fail to transmit ECG data through the net port or the serial port Fail to copy data between the electrocardiograph and the U disk
Possible Causes ① Setup and connection error ② Connection cable failure ③ Net port failure ① The ECG system does not support the U disk type ② USB socket failure
Correction Actions ① Reset and reconnect the device ② Change the connection cable ③ Change the net port ① Only the U disk in FAT format can be used ② Change the USB socket
4. Operation Troubles
Fault Symptoms
Key failure
No key beep
Possible Causes ① The key panel is damaged ② Main board failure ③ Faulty transition board of the upper and lower units ① Buzzer failure ② KEY BEEP is set to Off ③ Main board failure
Correction Actions
① Change the key panel ② Change the main board ③ Change the transition board of the upper and lower units ① Change the buzzer ② Set KEY BEEP to On ③ Change the main board
Key beep is raucous
Buzzer failure
Change the buzzer
The electrocardiograph can not print reports
① The recorder paper runs out. ② Print head failure ③ Main board failure
① Install the recorder paper ② Change the print head ③ Change the main board
The printed report is illegible
① The paper roller or the print head is dirty. ② Print head failure ③ Main board failure
① Clean the paper roller or the print head ② Change the print head ③ Change the main board
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SE-3 Electrocardiograph Service Manual
Electrocardiograph Servicing
Some characters or waveforms recorded are missing.
① The print head is dirty. ② Print head failure
① Clean the print head ② Change the print head
Fail to detect paper
① There is a stain on the detecting position of the print head. ② Print head failure ③ Main board failure
① Clean the print head ② Change the print head ③ Change the main board
5. Parameter Troubles Fault Symptoms
Possible Causes
Correction Actions ① Reconnect the electrode clamp again or clean the electrode area on body surface with alcohol ② Reconnect the patient cable to the unit ③ Change the ECG board ① Reconnect the electrode clamp again or clean the electrode area on body surface with alcohol ② Change the patient cable ③ Change the ECG board
No ECG waveform
① The electrode clamp is not connected well. ② Defective connection between the patient cable and the unit ③ ECG board failure
ECG waveform is abnormal or disturbed
① The electrode clamp is not connected well. ② Patient cable failure ③ ECG board failure
Heart rate is not accurate
Waveform measuring failure
Adjust connections
① The electrode clamp is not connected well. ② ECG board failure
① Reconnect the electrode clamp again or clean the electrode area on body surface with alcohol ② Change the ECG board
ECG waveform has burrs
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SE-3 Electrocardiograph Service Manual
Cleaning, Care and Maintenance
Chapter 7 Cleaning, Care and Maintenance 7.1 Cleaning CAUTION Turn off the power before cleaning and disinfection. The mains supply must be switched off if it is in use.
7.1.1 Cleaning the Main Unit and the Patient Cable The surfaces of the main unit and the patient cable can be wiped with a clean soft cloth damped in soapy water or non-caustic neutral detergent. After that, remove detergent remainder with a clean dry cloth.
7.1.2 Cleaning the Electrodes Remove the remainder gel from the electrodes with a clean soft cloth first. Take suction bulbs and metal cups of chest electrodes apart, and take clamps and metal parts of limb electrodes apart. Clean them in warm water and make sure there is no remainder gel. Dry the electrodes with a clean dry cloth or air dry naturally.
7.1.3 Cleaning the Print Head Dirty and soiled thermal print head will deteriorate the printing definition. So it should be cleaned at least once a month regularly. Open the recorder casing and remove the recorder paper. Wipe the print head gently with a clean soft cloth damped in 75% alcohol. For stubborn stain, soak it with a little alcohol first and wipe it off with a clean soft cloth. After air dries, load the recorder paper and shut the recorder casing. CAUTION 1. Prevent the detergent from seeping into the main unit while cleaning. Do not immerse the unit or the patient cable into liquid under any circumstances. 2. Do not clean the unit and accessories with abrasive fabric and avoid scratching the electrodes.
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SE-3 Electrocardiograph Service Manual
Cleaning, Care and Maintenance
7.2 Disinfection To avoid permanent damage to the equipment, disinfection can be performed only when it is considered as necessary according to your hospital’s regulations. Before disinfection, clean the equipment first. Then wipe the surfaces of the unit and the patient cable with hospital standard disinfectant. CAUTION Do not use chloric disinfectant such as chloride, sodium hypochlorite etc.
7.3 Care and Maintenance 7.3.1 Recharge and Replacement of Battery 1) Capacity Identification The battery capacity of the rechargeable battery can be identified according to the battery symbol in the top right corner of the LCD screen. : Full capacity : Capacity is limited, and recharge should be taken into account. : Capacity is low, and hint information BAT WEAK will be displayed on the LCD screen. The battery should be recharged immediately. 2) Recharge SE-3 is equipped with the recharge control circuit together with the built-in rechargeable lithium battery. When the unit is connected to the mains supply, the battery will be recharged automatically. Then the battery recharging indicator lamp ( indicator lamp (
) and the mains supply
) will be lit at the same time. During the recharging course, the symbol
flashes in the top right corner of the LCD screen. When the battery capacity is full, the symbol
stops flashing, and the battery recharging indicator lamp (
) is black. The
3-channel electrocardiograph can not be recharged when it is printing reports, and the battery recharging indicator is black; when the 3-channel electrocardiograph is switched off, the battery recharging indicator lamp (
) will be black if the battery is fully recharged.
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SE-3 Electrocardiograph Service Manual
Cleaning, Care and Maintenance
Because of the capacity consumption during the storage and transport course, the battery capacity is not full when it is used for the first time. Battery recharge should be considered before the first use. Note: If the battery has not been used for more than two months, it should be recharged before use. 3) Replacement When the useful life of the battery is over, or foul smell and leakage are found, please contact the manufacturer or the local distributor for replacement. WARNING 1. Only qualified service engineers authorized by the manufacturer can open the battery compartment and replace the battery. The battery of the same model and specification provided by the manufacturer must be used. 2. Danger of explosion -- Do not reverse the anode and the cathode when installing the battery. 3. Remove the battery from the electrocardiograph when the electrocardiograph is not used for a long time. 4. If the battery is stored alone and not used for a long time, we recommend that the battery should be charged at least once every 6 months to prevent overdischarge.
7.3.2 Recorder Paper Note: Recorder paper provided by the manufacturer should be used. Other paper may shorten the life of the thermal print head. The deteriorated print head may lead to illegible ECG reports and block the advance of the paper. Storage Requirements: ♦
Recorder paper should be stored in a dry, dark and cool area, avoiding excessive temperature, humidity and sunshine.
♦
Do not put the recorder paper under fluorescence for a long time.
♦
Make sure that there is no polyvinyl chloride or other chemicals in the storage environment, which will lead to color change of the paper.
♦
Do not overlap the recorded paper for a long time, or else the ECG reports may trans-print each other.
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SE-3 Electrocardiograph Service Manual
Cleaning, Care and Maintenance
7.3.3 Maintenance of Main Unit, Patient Cable and Electrodes The following safety checks should be performed at least every 24 months by a qualified person who has adequate training, knowledge, and practical experience to perform these tests. a) Inspect the equipment and accessories for mechanical and functional damage. b) Inspect the safety related labels for legibility. c) Inspect the fuse to verify compliance with the rated current and breaking characteristics. d) Verify that the device functions properly as described in the instructions for use. e) Test the protection earth resistance according to IEC/EN 60601-1: Limit 0.1 ohm. f) Test the earth leakage current according to IEC/EN 60601-1: Limit: NC 500μA, SFC 1000μA. g) Test the enclosure leakage current according to IEC/EN 60601-1: Limit: NC 100μA, SFC 500μA. h) Test the patient leakage current according to IEC/EN 60601-1: Limit: NC a.c. 10μA, d.c. 10μA; SFC a.c. 50μA, d.c. 50μA. i) Test the patient auxiliary current according to IEC/EN 60601-1: Limit: NC a.c. 10μA, d.c. 10μA; SFC a.c. 50μA, d.c. 50μA. j) Test the patient leakage current under single fault condition with mains voltage on the applied part according to IEC/EN 60601-1: Limit: 50μA (CF). The leakage current should never exceed the limit. The data should be recorded in an equipment log. If the device is not functioning properly or fails any of the above tests, the device has to be repaired. WARNING Failure on the part of the responsible individual hospital or institution employing this equipment to implement a satisfactory maintenance schedule may cause undue equipment failures and possible health hazards. 1) Main Unit ♦
Avoid excessive temperature, sunshine, humidity or dirt.
♦
Put the dustproof coat on the main unit after use and prevent shaking it violently when moving it to another place.
♦
Prevent any liquid from seeping into the equipment, otherwise the safety and the performance of the electrocardiograph can not be guaranteed. - 49 -
SE-3 Electrocardiograph Service Manual
Cleaning, Care and Maintenance
2) Patient Cable ♦
Integrity of the patient cable, including the main cable and lead wires, should be checked regularly. Make sure that it is conductible.
♦
Do not drag or twist the patient cable with excessive stress while using it. Hold the connector plug instead of the cable when connecting or disconnecting the patient cable.
♦
Align the patient cable to avoid twisting, knotting or crooking in a closed angle while using it.
♦
Store the lead wires in a big wheel to prevent any people from stumbling.
♦
Once damage or aging of the patient cable is found, replace it with a new one immediately.
3) Electrodes ♦
Electrodes must be cleansed after use and make sure there is no remainder gel on them.
♦
Keep suction bulbs of chest electrodes away from sunshine and excessive temperature.
♦
After long-term use, the surfaces of electrodes will be oxidized because of erosion and other causes. By this time, electrodes should be replaced to achieve high-quality ECG records. CAUTION
The device and accessories are to be disposed of according to local regulations after their useful lives. Alternatively, they can be returned to the dealer or the manufacturer for recycling or proper disposal.
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SE-3 Electrocardiograph Service Manual
Renewal Parts
Chapter 8 Renewal Parts The following list is intended as a guide for ordering parts of SE-3.
Part number
Description
01.57.040163
European-style chest electrode connection bulb / G-BE32-24 1×6
01.57.040162-11
European-style limb electrode clamp / C-RYGNB 1×4
01.57.471016
European-style patient cable
01.57.471017-11
American-style patient cable
02.02.20462-11
Power transition board PCBA
02.02.106908-01
12-channel ECG board PCBA (without firmware)
02.02.20465
Key panel transfer board PCBA
01.16.078199
LCD screen / 320×240
01.16.078175
LCD screen / 192×64
01.55.111450-01
SE-3 membrane key panel
02.02.106867
SE-3 main board (narrow LCD, without firmware)
02.02.106870
SE-3 main board (wide LCD, without firmware)
01.17.078197
Thermal print head
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