DRE Waveline Plus User manual

DRE Waveline Plus
Service Manual

DRE, Inc.
www.dremed.com
TABLE OF CONTENTS
SECTION 1 General Introduction.............................................................. 1-1
A. About the Manual.........................................................................1-1
B. Safety Information........................................................................1-1
C. Service Information......................................................................1-3
SECTION 2 Device Introduction................................................................ 2-1
A. Product Description......................................................................2-1
B. Front Panel ...................................................................................2-1
C. Rear Panel.....................................................................................2-3
D. Side Panels ...................................................................................2-4
E. Technical Specification................................................................2-4
F. Requirements................................................................................2-8
SECTION 3 Maintenance and Calibration .................................................. 3-1
A. Maintenance Schedule..................................................................3-1
B. Manufacturer Responsibility........................................................3-1
C. Visual Inspection..........................................................................3-1
D. Cleaning........................................................................................3-2
E. Thorough Inspection and NIBP Calibration.................................3-2
F. Electricity Safety Test ..................................................................3-5
SECTION 4 Troubleshooting..................................................................... 4-1
SECTION 5 Assembly demonstration ...................................................... 5-1
SECTION 6 Technical Drawings................................................................ 6-1
A. System Configuration ..................................................................6-1
B. Schematic Drawing ......................................................................6-1
C. PCB Component Layout and Test Points.....................................6-1
SECTION 7 Spare Parts List...................................................................... 7-1

B/0 1-1
Section 1 General Introduction
A. About The Service Manual
1. Objective: The Service manual is mainly used by biomedical equipment technicians and
service personnel. Users shall have sufficient electronic technology background, including analog
and digital electronics as well as computer technology.
2. Scope: A qualified professional may take this manual as a reference in the monitor installation,
maintenance and service.
3. Main Contents: The manual consists of the following chapters:
Chapter 1 General Introduction: Introduces the users, applications, main contents, safety and
service information of the manual.
Chapter 2 Device Introduction: Describes the product, networking Service specifications,
preparations before use and operation principles.
Chapter 3 Maintenance: Includes making maintenance plan, visual inspection, cleaning, check
and test.
Chapter 4 Troubleshooting: Introduces the monitor structure and system defaults setting.
Chapter 5 Disassembly demonstration: Provides assembly procedure.
Chapter 6 Technical drawings: Provides technical diagram.
Chapter 7 Spare parts list: Provides spare parts list.
B. Safety
1. Manufacturer Responsibility
The Company shall be responsible for the safety, reliability and performances of the monitor
under the following conditions:
 Installation, operation, function upgrade, readjustments, modifications and service are
conducted by professional authorized by the Company.
 Electric installation with neighboring rooms are conducted in accordance with the requirements
of correct rules.
The equipment is used correctly in conformity with operation guidance.
2. Precautions

B/0 1-2
 The user of the monitor must be qualified persons who have been trained and are capable of
using the monitor correctly.
 To protect patients’safety, use only parts and accessories manufactured or recommended by the
Company.
 Before connect the equipment to any other equipment not recommended in the manual, please
contact the Company in advance.
3. External Marks of the Equipment
Note: As the parameter configuration of the monitors can be different, there may not be some
marks on the monitor you purchased.
Defibrillator protection BF type applied part: F type applied part (float/insulation),
complies with IEC-60601-1 particular requirements, with higher requirements for
electric shock protection than B type applied part.
Defibrillator protection CF type applied part: F type applied part (float/insulation),
complies with IEC60601-1 particular requirements, with higher requirements for electric
shock protection than BF type applied part:
Caution: Check accompanying documents.
Fuse.
Electric potential balance terminal.
Power on /off (press-press)
CE 0123 The product is in conformity with the requirements of MDD 93/42/EEC through
certification by TUV P.S.
~ Alternating Current.
Protective Earth (Ground)
4. Classification
In accordance with IEC 60601-1 standards, UT4000F monitor and its applied parts are classified
as follows:

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 Classified according to type of electric shock protection: Class I, with internal power supply.
 Classified according to degree of electric shock protection: BF type applied part – NIBP, SpO2,
Temperature. CF type applied part – ECG, Respiration, invasive blood pressure.
 Classified according to degree of harmful liquid protection: common equipment (enclosed
equipment without protection against liquid going in).
 Classified according to the safety degree when used in environment of mixed gas of
combustible anesthetic gases and air or /and mixed gas of oxygen and N2O: the equipment
cannot be used in environment with mixed gas of combustible anesthetic gas and air or mixed
gas of oxygen or N2O.
Classified according to working mode: Continuous running mode.
5. Terminology
The terminology used in the manual “ Warning”, “Caution” and “Note” indicates the hazard and
remind users of the precautions to be taken according to the degree of importance. Hazard
indicates the potential cause which may result in injury to human body.
Warning: indicates the potential hazard or unsafe action which may result in death or serious
injury if not avoided.
Caution: indicates the potential hazard or unsafe action which may result in relatively minor injury
to human body or damage to product if not avoided.
Note: provides useful information and hint reminding user to pay attention to and ensure that the
monitor may play its role to the maximum degree.
C. Service Information
1. Service Requirements
Please observe the following service requirements:
 Only refer to the Customer Service Center about the equipment service issues.
 Equipment failure due to unauthorized service shall not be warranted.
 Monitor shall be maintained regularly according to the service schedule, otherwise, it may result
in equipment failure, even hazard.
 During the life time of the equipment, regular maintenance is the essential way to keep the
monitor function normally.
2. Equipment Identification
Each monitor manufactured by the Company has a unique serial number for equipment
identification and service.


B/0 2-1
Section 2 Device Introduction
A. Product Description
The monitor is easy to carry, advanced function, easy to use.
1. Dimension 320mm W x 250mm H x170mm D
2. Weight 7.95Kg
3. Screen 10.4"
4. Unity Network The device can be linked with central station.
B. Front Panel
The front panel of the Omni multi-parameter patient monitor is as follows:
1 2

3 4 4---9 10




B/0 2-2

(1) Handle
(2) Screen
(3) Power LED
Indicator
(4) Power Switch
(4) ECG Menu
(5) Waveform
Freeze/Restore
(7) Silence
(8) Print
(6) Start/Stop
NIBP Measure
(9) Main Menu
(10) Trim Knob
This handle is convenient for operator to carry the patient
monitor.
TFT screen for displaying waveform, menu, alarm status and
vital sign measurement results.
When the patient monitor is powered on, the LED is in green.
When the patient monitor is connected to AC power supply but
not turned on, the LED is in orange, indicating that the internal
battery is being charged.
Press this key to turn on /off the patient monitor.
Press this key to enter ECG Setup menu.
When a waveform sweep is displayed, press the key to freeze
the waveform.
When a waveform is being frozen, press this key to unfreeze
the waveform and restore waveform sweep.
Press this key to enable or disable Alarm sound.
Press this key to activate the recorder to print. Press this key
again to stop printing.
Press this key to start a blood pressure measurement. If the
patient monitor is in the process of blood pressure
measurement, press this key to stop blood pressure
measurement.
When screen does not display menu bar, press this key to
display the main menu bar. When the screen is displaying main
menu bar, press this key, then the main menu bar will disappear
from the screen.
When menu is displayed, rotate the knob to select the functions
at the bottom of the screen. When mouse cursor (arrow) is
pointing to a certain function, press the knob to select the
function. Then rotate the knob to select the desired item. In the
end, press the knob again to confirm the selection.

B/0 2-3
C. Rear Panel
The rear panel of Omni is as shown in Figure 3-2.
Fig.3-2 RearPanelDiagram
1. Handle 2. Product label 3. Fuse 1
4. 110-230VAC, 50/60Hz, external power supply socket
5. Fuse2 6.Equipotentiality 7.HeatExhaust
8. RS422 Communication port
RS422 communication port can only be connected with Infinium Medical’s
central station.
Accessory equipment connected to the analog and digital interfaces must be
certified according to the respective IEC standards ( e.g. IEC 950 for data
processing equipment and IEC 601-1 for medical equipment ). Furthermore, all
configurations shall comply with the valid version of the system standard
IEC 601-1-1. Everybody who connects additional equipment to the signal input
part or signal output part configures a medical system, and is therefore
responsible that the system complies with the requirement of IEC 601-1-1. If in
doubt, consult the service department or your local representative.
The definition of RS422 port is as follows,
1 N.C.NoConnected
2 N.C.NoConnected
3 N.C.NoConnected
4 TXD+ (B) Signal Transmitted+
5 TXD- (A Signal Transmitted -
6 RXD- (A) Signal Received -
7 N.C. No Connected
8 RXD+ (B) Signal Received +

B/0 2-4
D Side Panels
There are seven sockets/receptacles on the left side panel,
respectively:
ECG This socket accepts ECG cable accompanying the patient
monitor.
SpO
2
This socket accepts SpO
2
extension cable.
NIBP This receptacle accepts the hose connector plug
from the blood pressure cuff.
TEMP1 This receptacle accepts the temperature probe.
TEMP2 This receptacle accepts the temperature probe.
IBP1/2 There are two sockets on the right side panel of the IBP measurement
module, accepting the IBP cable.
Please consult the specific items in the parameters’ chapters.
There is an optional built-in recorder on the right side panel of the patient monitor
which is used to print the monitoring waveform and data.
Loading thermal paper: Open the door of the recorder by pressing in the
direction as indicated by the arrow, place print paper inside according to the diagram
on the recorder panel. Pull the paper until a few inches of paper is showing. Close the
side cover and now the recorder is ready to print.
NOTE: The recorder in Omni is optional. If you have not ordered the recorder,
please disregard the descriptions that refer to the recorder.
E. Technical specification
1. Safety Standards & Quality System
Designed to meet EN 60601-1:1990 + A1:1993 + A2:1995
Class I equipment, internally powered equipment, double insulated
TypeBFandCFappliedparts
ISO9001 & EN46001 Certified
2. Power Requirements
Power Supply 110-230 VAC, 50/60Hz
Input Power d115VA
Fuses Two fuse sockets in the rear panel indicated by symbol of
fuse, T2.0AL, 250V ~
Battery 12V/4.0AH sealed lead-acid

B/0 2-5
Charge time
Operating time
t8 hours
t1.5 hours (full recharge)
Battery Charging Method Automatic charging after monitor is connected to AC power
supply (with charge protection function)
Discharge Protection When powered by battery, the monitor will be automatically
turned off when battery power is almost used up.
3. Performance Specifications
(1) ECG
Patient Safety Standard IEC60601-1-1988
CMRR t60dB (Common Mode Rejection Ratio)
Measure Range 20 ~ 254bpm r1bpm
Heart Rate Averaging 8 second average
ST Segment Range -0.8 ~ + 0.8mV
Interface AAMI 6-pin
Lead Selection I, II, III (3 lead mode)
I, II, III, aVR, aVL, aVF, V (5 lead mode)
Lead Fault Alarm Audible, Visual
Input 5-lead ECG patient cable
QRS Indicator Audible and Visual Alert
Waveform Storage 6 minutes
Sweep Speed 12.5/25/50 mm/sec
Gain Selection 4mV, 2mV, 1mV, 0.5mV, 0.25mV,Auto
Trends 2 hours Æ4 hours Æ8 hours Æ24 hours Æ48
hours
Patient Isolation
Frequency width
Breakdown voltage: 4000VAC 50Hz 60 seconds
Leakage current: <10PA
Monitoring mode: 0.5 ~ 40Hz (+0.4dB,-3.0dB)
Surgery mode: 0.5 ~ 20Hz (+0.4dB, -3.0dB) (not
calibration significant)
Patient Drive Current <10PA
Enclosure Leakage Current <0.1mA
Maximum T wave Rejection Capability 1.2mV
Heart Rate Alarm Response Time < 7 seconds
Aspect Ratio 0.24 ~ 0.6 sec/mV
Defibrillator Protected & ESIS Protected Tested with 5kV
Recovery Time Following Defibrillation <5 seconds
(2) Respiration
Measurement Method Thoracic Impedance
Measurerange 5~99brpm
Accuracy r2 brpm
Refurbish time about 2 seconds
(3) Pulse Oximetry ( SpO2)

B/0 2-6
Measure Range 50 ~ 100%
SpO2Averaging 8 second average
SpO2Accuracy r2% (90 ~ 100%), r3% (50 ~ 89%)
Pulse Rate Range 30 ~ 250 bpm
Pulse Rate Averaging 8 beat average
Pulse Rate Accuracy r1% ( 30 ~ 100 bpm)
Sensor Types Finger, Universal “Y”, wrap probes
Pulse Rate Display Digital
Refurbish time about 2 seconds
Wavelength Infrared ˖940 nm
Red ˖660 nm
Energy Infrared İ22.5 mW
Red İ30 mW
(4) Non-Invasive Blood Pressure ( NIBP)
Method Automatic oscillometric
Parameters Systolic, diastolic, mean arterial pressure, pulse
Scale mmHg or kPa
Operating Modes Manual, Automatic, Continuous
Repeat Cycles 1 ~ 10, 15, 30, 60, 90, 120 minutes
Measure Range
Systolic Adult/pediatric 30 ~ 254mmHg (4.0 ~ 33.9kPa)
Neonate 30 ~ 135mmHg (4.0 ~ 18.0kPa)
Diastolic Adult/pediatric 10 ~ 220mmHg (1.3 ~ 29.3kPa)
Neonate 10 ~ 110mmHg (1.3 ~ 14.7kPa)
Cuff Pressure Range Adult/pediatric 0 ~ 280mmHg (0 ~ 37.3kPa)
Neonate 0 ~ 140mmHg (0 ~ 18.7kPa)
Initial Cuff Inflation Adult/pediatric 170r10mmHg (22.7r1.3kPa)
Neonate 100r10mmHg (16.0r1.3kPa)
Deflation Pressure 30mmHg(4.0kPa) higher than the last systolic pressure.
Cuff Inflation Rate No greater than 50mmHg/sec
Measurement Time Typical 25 seconds
Maximum 40 seconds
Typical Stat 20 seconds
Pressure Display Accuracy r3mmHg
BP Pulse Rate Accuracy r2% @ 40 ~ 240bpm.
Cuff Neonate, infant, pediatric, standard adult.
(5) Invasive Blood Pressure (Dual Channel)
Measure range -30 ~ +300 mmHg (-4.0 ~ +40.0 kPa )
Scale mmHg or kPa
Accuracy 1mmHg
Waveform Span Adjustable to 40,60,80,330 mmHg

B/0 2-7
Transducer sensitivity 5uV/V/mmHg
Alarm AudioandVisual
Refurbish time about 2 seconds
(6) Temperature (Dual Channel)
Number of channels 2
Measurerange 0~50qC
Probe type YSISeries400
Scale Celsius
Accuracy r0.1qC
Resolution 0.1qC
Refurbish time about 1 second
4. TFT Color Display
Size 10.4
Matrix 640 (H) x 480 (V) pixels
5. Recorder (Optional)
Type Built-in 2-channel thermal array recorder
Print mode Text or waveform
Waveforms Real time or alarm-triggered
Resolution 400dpi vertical, 800dpi horizontal
Annotations Time, date, vital sign readings
6. Environmental Specifications
Temperature Operating +10~+40qC
TransportandStorage -20~+60qC
RelativeHumidity Operating İ85% (non-condensing)
Transport and Storage 10 ~ 90% (non-condensing)
Atmospheric pressure Transport and Storage 500 ~ 1060 hPa
Specifications subject to change without notice.

B/0 2-8
F. Requirements

1. Power requirement
At least one grounded duplex wall receptacle should be provided for each monitor.
2. Ventilation requirement
The monitor will produce heat while working. So the monitor should be located in a
ventilated place.
Caution. Do not locate the monitor in an enclosed area that may restrict the heat
dissipated by it.
Caution. The monitor must be located no closer than 4 inches(10 cm) from any
partition or wall. The monitor should be approximately 12 inches (30 cm) from any
overhead partition or the ceiling.

B/0 3-1
Section 3 Maintenance and Calibration
A. Maintenance Plan
To maintain the normal running of the monitor, a good maintenance plan must be made. We
recommend the following:
1. Visual inspection: Before use, operator shall first inspect the outside appearance of the
equipment. Service personnel shall first inspect the outside appearance of the equipment before
maintenance.
2. Cleaning: Operator shall first clean the equipment before use. Maintenance personnel shall
clean the equipment after maintenance.
3. Thorough inspection: When monitor is received, a qualified person must inspect the monitor
thoroughly. Service personnel shall inspect the monitor thoroughly every time when maintenance
is done or every 12 months.
4. Leakage current test: Operator shall inspect the equipment before using the monitor. Service
personnel shall inspect the equipment before maintenance.
5. NIBP calibration: Each year qualified personnel shall perform NIBP calibration for the
monitor.
B. Manufacturer’s Responsibilities
If customer has not implemented the maintenance plan, which results in inaccurate measurement
of the monitor or potential hazard to operators and patients, unless otherwise agreed by both
parties, the manufacturer shall not undertake any responsibilities. All responsibilities shall be
taken by the monitor user.
C. Visual Inspection
Before using the monitor, make sure to inspect the monitor carefully:
1. Carefully inspect the outside of the monitor, display and control parts to see if there is any
apparent physical damage. If yes, please do not use the monitor. Please contact authorized service
personnel and reflect the damage until problems are settled before connect the monitor to patients.
2. Inspect all cables, connecting wires and external connectors. If there is any damage, please do
not use the monitor. Please contact authorized service personnel and reflect he damage until the
problems are settled before connect the monitor to patients.
3. Inspect if the safety marks on the equipment is distinct.

B/0 3-2
D. Cleaning
1. Clean the display screen
Use a soft cloth soaked in glass detergent to gently wipe the screen.
Caution: Do not spry glass detergent or other detergent directly to the screen.
Do not use medical disinfectant to clean the screen.
2. Clean the equipment surface
Use a clean cloth soaked in mild soap water to clean the surface of the equipment.
3. Manufacturer Recommendation
To avoid damaging the monitor, we recommend the following:
(1) Use detergent recommended by the manufacturer.
(2) Each time after cleaning, use a dry cloth to wipe out reminding detergent.
(3) Never pour water or detergent directly to the monitor. Never let liquid flow into the monitor.
(4) Do not use the following detergent: abrasive detergent, alcohol detergent, acetone detergent.
E. Thorough Inspection and NIBP Calibration
1. Test Equipment
Multi-functional simulator
ECG cable, 5-lead, AHA
NIBP extension tube
Temperature extension cable
Digital pressure meter
SpO2simulator
SpO2cable
2. Monitor power supply and battery test
(1) Connect power cable between the wall outlet and monitor power connector and power the
monitor up.
(2) Inspect if the power indicator lights up and the indicator color.
Green: The monitor is powered on and in normal working status.
Yellow: The monitor is connected to AC power but not turned on. It is under internal battery
charging status.
(3) Press the power switch of the monitor to turn on the monitor and unplug the power cable.
Inspect if the power indicator is green and if a battery mark is in the status box on the screen

B/0 3-3
showing that the monitor is powered by battery.
(4) Conduct ECG test according to the following instructions.
(5) Reconnect the monitor to AC power and start the tests.
3. ECG test
(1) Set the ECG simulator as follows:
Heart rate: 80bpm, ECG gain: 1mV
(2) Connect one end of the ECG cable and leadwires to the ECG connector of the monitor and the
other end to the simulator.
(3) Confirm if patient simulator has been connected properly to the monitor.
(4) Observation: ECG lead II is displayed in the ECG channel, without noise. Heart rate display:
80±2bpm. When R wave appears, you can hear a “beep”.
(5) Check every ECG lead to see if there is any ECG waveform and noise interference.
(6) Adjusting ECG gain to be 2mV, observe if there is any change in ECG waveform.
(7) Unplug the RA from simulator, then observe if the screen prompts “lead off”.
(8) Reconnect RA lead.
(9) Set 1mV calibration in the ECG setting menu, and observe if a 1mV calibration square wave is
overlapped over the ECG waveform.
(10) ECG test is complete.
4. Respiration test
(1) Connect ECG cable to the ECG socket properly and set the simulator as follows: respiration
baseline resistance: 500 Ohm, Respiration Delta R: 0.5 Ohm, Respiration lead: I or II.
Respiration rate: 30bpm
(2) Set monitor respiration lead to be RA-LA or LL-RL and set respiration waveform channel.
(3) Observe if respiration parameter area displays reading 30±2bpm, waveform channel displays
respiration waveform.
(4) Change monitor respiration lead and observe the above parameter and waveform.
(5) Unplug ECG cable and respiration test is complete.
5. Temperature Test
(1) Set simulator temperature output to be 37 degrees Centigrade.
(2) Connect one end of the temperature probe to the simulator, and the other end to patient
monitor.
(3) Observe temperature parameter area to see if the reading shows 37.0 degrees Centigrade +/-0.1
degree Centigrade.
(4) Unplug the cable between the simulator and monitor. Temperature test is complete.
6. Invasive Blood Pressure Test
Invasive blood pressure test is applicable to monitor which is configured with invasive blood

B/0 3-4
pressure function.
(1) Set the simulator as follows: blood pressure output: ATM
(2) Connect one end of the BP cable to the BP1 socket on the simulator, the other end to the IBP1
socket on the monitor.
(3) Press Zero in the IBP menu.
(4) Select ART to be the blood pressure measurement position. Observe if the IBP parameter area
displays blood pressure reading on the screen and if the waveform channel has IBP waveform
(IBP channel shall be set in the menu in advance).
(5) Change the BP output in the simulator to be 200mmHg.
(6) Observe if the parameter display area on the screen displays 200 or 200 ±6mmHg.
(7) Unplug the cable between the simulator and the monitor. IBP test is complete.
7. Pulse Oximetry Test
(1) Power off the Oximetry simulator.
(2) Connect the Oximetry cable of the simulator to the SpO2socket on the monitor.
(3) Power on the simulator, set simulator: SpO2– 95%, Pulse Rate – 100
(4) Verify if SpO2parameter area reading is between 92 – 99%, and if the waveform in the
waveform channel is normal, and if the pulse rate reading is between 96 to 104.
(5) Power off the simulator and unplug the oximetry cable. Pulse oximetry test is complete.
8. Non-invasive Blood Pressure Test and Calibration
The accuracy of the NIBP reading of the monitor is decided by: NIBP calibration and the
measurement range of the blood pressure sensor. Correct testing and calibration methods are as
follows:
(1) Unplug all cables connected to the monitor except for the power cable.
(2) Turn on the power switch of the monitor.
(3) In the main menu, rotate the knob to 6(783  then press the function key (password) in turn
as follows˖ėėėėėthen press the knob, and

enter the system calibrationmenu
(4) Rotate knob, select “ON” for Pressure Test, then exit the system calibration menu.
(5) Connect the hose of the cuff to digital pressure meter, auto inflating bladder and NIBP socket
at the side panel of the monitor through a 3-way TEE.
(6) Inflate the cuff to a certain pressure level, compare the pressure reading on the digital pressure
meter and the monitor screen to see if their value difference are less than 3 mmHg. If not, you
need to do blood pressure calibration.
(7) Enter system calibration menu, rotate knob to Pressure Adjust, select the value to be calibrated
(-6 – 6mmHg orAuto), then exit the system calibration menu.
(8) Repeat (6) , if digital pressure meter and monitor screen have the same pressure value, then

B/0 3-5
calibration is complete. If not, re-calibration is required. If the same results cannot be obtained
through repetitive calibration, please contact manufacturer.
9. Speaker Test
(1) Turn on alarm sound and set Heart Rate alarm limits. Test if the monitor will make alarm
sound when heart rate is outside alarm limits.
(2) Silence alarm sound and test if the monitor will make alarm sound when heart rate is outside
the alarm limits.
(3) Turn on the alarm sound. Speaker test is complete.
10. Networking Test
After monitor is networked with the central station monitoring system, inspect if the ECG
waveform and its parameters will be correctly displayed on the central station monitoring system.
When the above tests are complete, turn off all the test devices and monitor and remove the test
devices away from the monitor.
F. Electric Safety Test
Electric safety test inspects if the monitor has potential hazards to patients or operators.
In order to establish a systematic maintenance plan, we recommend all safety tests and records
shall be made under the following circumstances: Upon reception of the monitor, every other year,
and the monitor is opened for repair.
Caution: If hospital staff did not observe the maintenance plan, which leads to inaccurate
measurement of the monitor or potential hazards to operators or patients, unless otherwise agreed
by both parties, manufacturer shall not undertake any responsibilities. All responsibilities shall be
undertaken by the user of the monitor.

B/0 4-1
Section 4 Troubleshooting
A. Special Components
1. Surface Mounted Devices
Surface mounted devices are used to aid in miniaturizing the electrical assemblies
within the monitor.
Warning: Surface mounted components were not designed to be removed or
replaced using standard soldering equipment. Removal of surface mounted
components using a conventional soldering iron can potentially destroy the PCB.
Only soldering workstations specifically designed for surface mount technology may
be used to remove and replace these type of components.
B. Power Failure


No display after power on
Phenomenon: When the monitor is powered up, there is no display on the screen
and LED does not light up.
Inspection method:
 Without connecting the monitor to AC power supply, check the
battery power level.
 When connecting the monitor to AC power supply, check the
connection between the power socket and the plug of the
monitor, the power cable, and the AC output.
Solution: Make sure all connections are reliable and connect the monitor to
AC power supply to charge the internal battery.
C. Data Received Trouble
1 No ECG waveform
Phenomenon: When leadwires are connected, there is no ECG waveform. The
screen displays “LEAD OFF” or “NO SIGNAL”.
Inspection method: Check ECG electrodes contact with patient’s skin and check all
leadwire connections.

B/0 4-2
Solution: 1) Replace ECG electrodes and clean the skin surface where
electrodes are applied.
2) Resistance of 1k¡should exist between extension wires
applied to patient body to the leads of the ECG connector. If it
is indefinitely large, it shows that the leadwire is broken and
should be replaced.
3) If ECG waveform channel shows “No signal received”, then it
shows there is some problem in the communication between
ECG module and the main system. If this message still remains
after the monitor is turned off and on again, please contact the
supplier.
2 ECG Baseline Shift
Phenomenon: ECG baseline is not stable, occasionally shifts out of the display
area.
Inspection method:
1) Check if the working environment is very humid and if the
monitor has moisture inside.
2) Check if the electrode’s quality is good, and the skin surface
where the electrode is applied is clean.
Solution:
1) Turn on the monitor and let it run for 24 hours to remove
moisture inside.
2) Replace it with good electrode, clean the skin surface where the
electrode is applied.
3 ECG Waveform Noise
Phenomenon: ECG waveform is too large, no entire frame of ECG waveform can
be seen.
Inspection method: Check if the ECG scale is so high that it results in the ECG
waveform overflow.
Solution: Adjust ECG scale to a proper level, normally 1.0mV or 2.0mV.
4 Electrosurgical interference on ECG
Phenomenon: In the surgical operation procedure, the use of electrosurgical
equipment will cause interference on ECG.
Inspection method: Check the grounding condition of the monitor and the
electrosurgical equipment.
Solution: Make sure the monitor and the electrosurgical equipment are