Fukuda Denshi LX-7120 User manual

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EC CG G a an nd d R Re es sp pi ir ra at ti io on n T Tr ra an ns sm mi it tt te er r
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LX X- -7 71 12 20 0
Service Manual
zBefore setting up/ maintenance, read this service manual carefully.
zKeep this manual where it can be always referred to.

This device bears the CE label in accordance with the provisions of
Medical Device Directive 93/42/EEC and R&TTE Directive 1999/5/EC.
We, FUKUDA DENSHI CO., LTD. hereby declare that this transmitter model
LX-7120 is in compliance with the essential requirements and other
relevant provisions of R&TTE Directive 1999/5/EC.
THE PERSONS RESPONSIBLE FOR PLACING DEVICES ON THE EC
MARKET UNDER MEDICAL DEVICE Directive 93/42/EEC and R&TTE
Directive 1999/5/EC.
FUKUDA DENSHI UK
13 WESTMINSTER COURT, HIPLEY STREET, OLD WOKING, SURREY
GU22 9LG, U.K.
CAUTION: FEDERAL (U.S.A.) LAW RESTRICTS THIS DEVICE TO SALE BY
OR ON THE ORDER OF A PHYSICIAN.
CAUTION:
•This device for sale by or on the order of a physician.
•The company and product names used in this manual are trademarks or registered
trademarks.
•If this manual has pages missing or out of order, contact Fukuda Denshi for replacement.
•Only physician or persons instructed by physicians are allowed to use the equipment.
•The information contained in this document is subject to change without notice due to
improvement in the equipment.
Copyright © 2011 by Fukuda Denshi Co., Ltd.
No part of this document may be copied or transmitted in any form without the prior written permission
of Fukuda Denshi Co., Ltd.
Printed in Japan.
REP
EC
For EU

Service Manual Delivery Notice
Service Manual (No. ): Q’ty 1
Please confirm your receipt of the above service manual by filling
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Delivery of Service Manual
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If the technical drawing in the service manual is unreadable, you
can request it to us by specifying a page or a part.
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strictly prohibited.
Also, for improvement of the future service manual, your comment
and request will be appreciated. If you have any comment or
request on usability, viewability, readability, or if you notice
anything hard to understand on this service manual, please inform
it to us.
Development & Production Support Dept.
Fukuda Denshi Co., Ltd.
2-35-8 Hongo Bunkyo-ku, Tokyo
113-8420 Japan
Receivedby
of (Company/Hospital)
onthedayof

Revision History
Equipment
LX-7120 Service Manual
Edition Revised Items Reason of the Revision Date
1 – First Edition 2011.01

i
Preface
Thank you for purchasing this product.
Before using this product, read the following precautions to make sure the product is
used correctly and safely.
Safety Precautions·························································· ii
Graphic Symbols ·························································· ii
Precautions for Safe Operation of Medical Electrical
Equipment ···································································iv
Non-Explosion Proof·····················································v
Precautions about Magnetic Resonance Imaging
(MRI) ············································································v
Electrosurgery Safety ···················································v
Defibrillation Safety······················································ vi
Precautions about the Pacemaker ······························vi
Precautions about the LX-7120 ·································· vii
Precautions about Waterproof···································· vii
Precautions about ECG·············································· vii
Precautions about Output Signal······························· viii
Precautions about Accessories and Optional
Accessories ······························································· viii
Precautions about Battery ········································· viii
Precautions about Disposing of Equipment,
Accessories, or Components····································· viii
Precautions about Disposing of Battery····················· viii
Precautions for Use of Medical Telemeter··················· ix
Precautions about the Maintenance ·····························x
Electromagnetic Compatibility·······································xi
Precautions for Safe Operation under Electromagnetic
Influence······································································ xi
EMC Guidance ···························································· xi
●Compliance to the Electromagnetic Emissions
·········································································· xii
●Compliance to the Electromagnetic Immunity (1)
·········································································· xii
●Compliance to the Electromagnetic Immunity (2)
········································································· xiii
●Recommended Separation Distances between
Portable and Mobile RF Communications
Equipment and the LX-7120····························· xiv

ii
Safety Precautions
yRead the “Safety Precautions” thoroughly before use to ensure correct and safe use of the product.
yBe sure to follow the precautions indicated below, as these are important messages related to safety.
DANGER Failure to follow this message may cause immediate threat of death or serious
injury.
WARNING Failure to follow this message may result in death or serious injury.
CAUTION Failure to follow this message may cause injury or failure to the equipment.
NOTE
A note is not related to product safety, but provides information about the
correct use and operating procedures to prevent incorrect operation and
malfunction of the equipment.
Graphic Symbols
Refer to the following symbols indicated on the LX-7120 for their meanings.
Symbols indicated on the main unit
Symbol Description
Caution: Refer To Accompanying Documents
Indicates the need to refer to the operation manual before operation.
Type CF Applied Part with Defibrillation-Proof
Indicates that the degree of protection against electric shock is Type CF Applied
Part with defibrillation-proof.
No Alarm Function
Indicates no alarm function.
Battery Type and Direction
Indicates the battery type and direction.
Year of Manufacture
Indicates the manufactured year.
WEEE (Waste Electrical and Electronics Equipment)
Indicates a separate collection for electrical and electronic equipment.

iii
Symbols indicated on the LCD screen
Symbol Description
Heart Rate Synchronization Mark
This mark flashes synchronizing with the heartbeat.
Battery Mark
Indicates the remaining battery level.

iv
Precautions for Safe Operation of Medical Electrical Equipment
Cautions described here are regarding the general instructions for safety use to the patient and the
operator. As for cautions about the LX-7120, please refer to the following page.
CAUTION
1. Users should have a thorough knowledge of the operation before
using this equipment.
2. Pay attention to the following when installing or storing the
equipment.
•Do not install or store in an area where the equipment will be subject to
splashing water.
•Do not install or store in an area where the environmental conditions, such as
atmospheric pressure, temperature, humidity, ventilation, sunlight, dust,
sodium, sulfur, will adversely affect the system.
•Place the equipment on a stable surface where there is no inclination, vibration,
or shock (including during transportation).
•Do not install or store in an area where chemicals are stored or gases are
generated.
3. Before operating the equipment, verify the following items.
•Check the cable connection and polarity to ensure proper operation of the
equipment.
•Ensure that all cables are firmly and safely connected. Especially, recheck the
attachment and connection condition of electrode.
•Pay special attention when the equipment is used in conjunction with other
equipment as it may cause erroneous judgment and danger.
•Check the remaining battery level.
•When replacing the battery, make sure that the battery polarity is correct. Do
not charge the battery.
4. During operation of the equipment, verify the following items.
•Do not operate the equipment beyond the time period required for diagnosis
and medical care.
•Do not pick up and/or swing the equipment pulling/grabbing the cable part. It
may damage the equipment and lead to measurement error.
•Always observe the equipment and patient to ensure safe operation of the
equipment.
•If any abnormality is found on the equipment or patient, take appropriate
measures such as ceasing operation of the equipment and/or detaching the
electrode, in the safest way for the patient.
•Do not allow the patient to come in contact with other equipments.
5. After using the equipment, verify the following items.
•Make sure to turn off the power of the equipment.
•When unplugging the cables, do not apply excessive force on the cable and pull
from its connector.
•Clean the accessories and cables, and keep them together in one place.
•Keep the equipment clean to ensure proper operation for the next use.
•Make sure to remove the batteries if the equipment is not used for a long time.
The leakage from the batteries may damage the device or an explosion from
the batteries may occur.
6. If the equipment is damaged and in need of repair, ensure patient
safety by immediately turning the equipment off and remove the
electrodes and/or probe from the patient. User should not attempt
service. Label the unit “OUT OF ORDER” and contact Fukuda
Denshi representative.
7. Do not remodel the equipment.
8. Maintenance Check
•Make sure to periodically check the equipment, and accessories.
•Before reusing the equipment that has been left unused for a while, make sure
that the equipment works normally and safely.

v
CAUTION
9. When using electrosurgical knives or defibrillator with this
equipment, take care of the following.
•To prevent burn injury to the patient, verify proper attachment of patient ground
plate, ECG electrode type for the electrosurgical knives, and the quantity of gel,
output energy for the defibrillator. Also, verify that a proper ground is selected.
•Some types of equipment other than the above may cause accidental
hazards to the patient and operator due to the conditions of the
equipment. Read the operation manual attached to each device and
understand the precautionary instructions prior to use.
Non-Explosion Proof
DANGER
zNever operate the equipment in the presence of flammable anesthetics,
high concentration of oxygen. It may cause an explosion or fire.
zNever operate the equipment inside a hyperbaric chamber. It may cause
an explosion or fire.
zNever operate the equipment where flammable gas or fluid such as
anesthetic, oxygen, and hydrogen are used. It may cause an explosion or
fire.
Precautions about Magnetic Resonance Imaging (MRI)
WARNING
zDo not operate this equipment in magnetic resonance imaging (MRI)
environments.
zWhen conducting MRI test, remove the electrodes and sensors connected
to the patient (test subject).
The local heating caused by the induced electromotive force may cause
burn injury to the patient (subject). For details, refer to the operation
manual for the MRI testing device.
Electrosurgery Safety
WARNING
zWhen using electrosurgical instrument, make sure the contact between
the patient and the ground plate is secure. If the connection is incomplete,
the patient may suffer a burn at the electrode site.
zWhen using an electrosurgical instrument, it may misidentify noise from
the electrosurgical instrument as a heartbeat or arrhythmia.

vi
Defibrillation Safety
WARNING
zUse only the lead cable specified by Fukuda Denshi when defibrillating. If
used by unspecified lead cable, the device may be damaged, resulting in
a safety hazard.
zWhen using the defibrillator, keep away from the electrodes or
medicament applied to the patient chest. If this is not possible, remove
the electrodes or medicament before using it.
If the defibrillator paddles are directly in contact with the electrodes or
medicament, an electrical shock may result from the discharged energy.
zWhen using the defibrillator, do not touch the patient and the metal part of
the device or cables. Electric shock may result from the discharged
energy.
Precautions about the Pacemaker
WARNING
zMinute ventilation rate-adaptive implantable pacemakers can occasionally
interact with certain cardiac monitoring and diagnostic equipment, causing
the pacemakers to pace at their maximum programmed rate. The cardiac
monitoring and diagnostic equipment may possibly send wrong
information.
If such event occurs, please disconnect the cardiac monitoring and
diagnostic equipment, or follow the procedures described in the operation
manual of the pacemaker.
(For more details, contact FUKUDA DENSHI personnel, your institution’s
professionals, or your pacemaker distributors.)
Reference
“Minute Ventilation Rate-Adaptive Pacemakers”
FDA alerts health professionals that minute ventilation rate-adaptive implantable
pacemakers can occasionally interact with certain cardiac monitoring and
diagnostic equipment, causing pacemakers to pace at their maximum
programmed rate.
[October 14, 1998 (Letter: www .fda.gov/cdrh/safety.html) – FDA]
zECG meter may continue to count the pacemaker rate during occurrences
of cardiac arrest or arrhythmias. Do not rely entirely upon the ECG meter
alarms. Keep pacemaker patients under close surveillance. Check this
manual for disclosure of the pacemaker pulse rejection capability of this
instrument.

vii
Precautions about the LX-7120
WARNING
zDo not connect cables not authorized by Fukuda Denshi to any I/O
connector. If done so by mistake, the LX-7120 cannot deliver its
maximum performance and may be damaged, resulting in a safety
hazard.
zDo not use this device with multiple patients simultaneously.
zThis device itself has no alarm function. Do not use it if an alarm function
is necessary. The alarm function with the receiving monitor, refer to the
operation manual of the receiving monitor.
CAUTION
Do not pick up and/or swing the LX-7120 pulling/grabbing the cord part. The
cable could break or get disconnected from the LX-7120. And it may hit
people or damage other equipment around.
Precautions about Waterproof
CAUTION
zReplace the “Battery Compartment Lid” of the LX-7120 regularly to keep
the main unit performance of waterproof. If not regularly replaced, the
quality of the lid will deteriorate and cannot keep the waterproof
performance. For details about the regular replacement, contact your local
Fukuda Denshi service representative.
zThe lid may be damaged from high impact. If the LX-7120 is dropped or is
subjected to a high impact, make sure that the lid is not damaged.
zDo not use the LX-7120 wet. Always wipe the LX-7120 with a soft cloth and
dry it thoroughly before use.
Precautions about ECG
CAUTION
zWhen removing electrodes from the patient, remove them carefully and
slowly. Do not apply excessive force to remove them. Otherwise, it may
damage the skin.
zThere are some cases when the pacemaker pulse cannot be detected
depending on the pacemaker type, pulse voltage, pulse width, electrode
lead type (unipolar, bipolar), electrode placement, or lead method which
causes the pacemaker pulse amplitude to decrease and disables
pacemaker pulse detection.
zIf signals similar to a pacemaker pulse are present, such as electric blanket
noise or excessive AC frequency noise, these may be erroneously
detected and displayed as a pacemaker pulse. In this case, check the
condition of the electrodes and ECG lead cable to resolve the cause or turn
off the pacemaker detection setting on the receiving monitor.

viii
Precautions about Output Signal
WARNING
Do not use the output signal of the monitor that receives radio wave signal
from the LX-7120 as the trigger signal for IABP, MRI echocardiographic, or
defibrillator for the following reasons.
yIt may lead to a delay of operating timing due to the delay time of
waveform transmission.
yA trigger signal unrelated to the heart rate may be generated due to the
interfusion of spike noise at weak electric field.
Precautions about Accessories and Optional Accessories
WARNING
Use only the accessories, such as ECG Lead cable, specified by Fukuda
Denshi for the LX-7120. Otherwise, the LX-7120 cannot deliver its maximum
performance and may be damaged, resulting in a safety hazard.
CAUTION zDo not reuse disposable products.
zStore the disposable products properly as mentioned in their user manuals.
Precautions about Battery
WARNING
zUse new "AA" size (“LR06” size) alkaline cell.
zInstall the battery with the correct polarity.
zDo not charge the battery. Any attempt to charge the battery may cause it
to leak or break.
zDo not short the (+) and (-) terminals. It may result in exothermic heat and
fire.
zDo not throw the battery into fire. It may explode.
Precautions about Disposing of Equipment, Accessories, or Components
CAUTION
zWhen disposing of the equipment, accessories, or components, use an
industrial waste distributor. Do not dispose of as ordinary waste.
zUsed disposal items (ECG electrodes, etc.) shall be discarded as medical
waste.
Precautions about Disposing of Battery
CAUTION Obey the local municipal rule to dispose the used dry cell battery.

ix
Precautions for Use of Medical Telemeter
WARNING
zThe LX-7120 transmitter must not be co-located or operated in
conjunction with any other antenna or transmitter.
zThe LX-7120 complies with FCC radiation exposure limits set forth for a
controlled environment and meets the FCC radio frequency (RF)
Exposure Guidelines in Supplement C to OET65. The LX-7120 has very
low levels of RF energy that are deemed to comply without testing of
specific absorption ratio (SAR).
zOperation of LX-7120 requires the prior coordination with a frequency
coordinator designated by the FCC for the Wireless Medical Telemetry
Service.
zThis radio frequency device is susceptible to interference from outside
sources. Interference may prevent the monitoring of patients connected
to this device. If a problem exists, contact your local service
representative.
zThe LX-7120 transmits vital signs to the receiving monitor using radio
wave signal. Under unstable radio wave signals, the receiving monitor will
not generate any alarms. This situation may miss sudden change in the
patient's condition and may cause a serious accident. Under unstable
radio wave signals, check the patient status consistently under this
situation. To get stable radio wave signals, make sure to have a proper
telemetry installation.
CAUTION
•For installation, make sure the following.
•The medical institution (hereinafter referred to as the “Institution”) must
decide the telemetry installation plan for the medical department in order
to prevent interference and interference between transmitters (telemetry
based on destination country’s radio law). When telemetry has already
been installed and been used, radio format, frequency, and antenna
power are required to be examined to prevent interference.
•When using telemetry, which requires zone location, the Institution is to
set up the zones as an operation unit for each transmitter to prevent
electronic interference between telemetry throughout the Institution.
•When using telemetry, which requires zone location, display and identify
each prepared zone in the equipment.
•When laying receiver antenna for each transmitter, the Institution has to
examine the installation so that electronic interference does not occur.
•Based on the above examination result, the Institution should install each
receiver antenna as required.
•For management, make sure to follow the precautions below.
•The Institution should appoint a person (hereinafter referred to as the
“Overall Manager”) to manage the wireless channels for the whole
Institution.
•And when using telemetry, which requires zone location, the Institution
should nominate a person (hereinafter referred to as the “Zone
Manager”) to manage the wireless channels in each zone. However,
when using such telemetry in a local Institution, one person can perform
both functions.
•The Overall Manager and Zone Manager must be selected from people
who understand the characteristics and functionality of telemetry
systems, and are skilled in operating telemetry.
•When installing telemetry, the Overall Manager and the Zone Manager
have to understand the precautions for use of telemetry in advance.

x
CAUTION
•The Overall Manager is responsible for maintenance of wireless channel
and storage and maintenance of telemeter in the overall medical facilities
to give proper instructions to the Zone Manager when using telemetry
needing zone alignment, and to the telemetry user when using telemetry
not-needing zone alignment.
•The Overall Manager should create a management log (hereinafter
referred to as the “log”), which contains a list of the management status
of the wireless channels for the whole Institution. When changing a
wireless channel, register it in the log and give proper instructions to the
Zone Manager or to the user.
•The Zone Manager assumes responsibility for managing the wireless
channels, storing, and managing telemetry.
•The Zone Manager assigns the transmitter to the user, and provides
enough education for use inside the zone.
•The telemetry user verifies operation of the transmitter/receiver before
use.
•The telemetry user, if using the telemetry in a zone location, follows the
instructions of the Zone Manager for the zone and gives instructions to
the patient if required.
•When interference or breakdown occurs in telemetry communication, the
user is required to inform the Zone Manager and the Overall Manager of
the problems. The Zone Manager and Overall Manager are to deal with
the problem properly and/or contact their nearest Fukuda Denshi
representative for service.
Precautions about the Maintenance
Safety Inspection and Maintenance
For safe operation of the equipment, regular inspection and maintenance is required. Once a year,
check all cables, devices, and accessories for damage. Maintain a record of these safety
inspections.
Immediate maintenance has to be carried out if ;
ythe equipment was subjected to extreme mechanical stress, e.g. after a heavy
fall.
ythe equipment was subjected to liquid spill.
ythe monitoring function is interrupted or disturbed.
yparts of the equipment enclosure are cracked, removed, or lost.
yany connector or cable shows signs of deterioration.
Reference Refer to “8. Periodic Check” for details.
WARNING Never open the housing while the equipment is in operation as it may result
in electric shock.
Maintenance, Modifications, and Repairs
Fukuda Denshi is liable for the safety, reliability, and performance of its equipment only if;
yMaintenance, modifications, and repairs are carried out by authorized
personnel.
yComponents are used in accordance with Fukuda Denshi operating
instructions.
A full technical description of the LX-7120 is available from your local Fukuda Denshi
representative.

xi
Electromagnetic Compatibility
The performance of this device under electromagnetic environment complies with IEC 60601-1-2
(2007).
Precautions for Safe Operation under Electromagnetic Influence
CAUTION
If any sorts of electromagnetic wave, magnetic field, or static electricity exist around
the device, noise interference or malfunction of the device may occur. If any
unintended malfunction or noise occurs during monitoring, check the magnetic
influence and take appropriate countermeasures.
The following are examples of the common cause and countermeasures.
●Mobile Phone
The radio wave may cause malfunction to the device.
Cellular phones and radio sets should be turned off in the room (building)
where medical device is located.
●Static Electricity
In a dry environment (room), static electricity is likely to occur. Take the
following countermeasures.
•Both operator and patient should remove any static electricity before
entering the room.
•Humidify the room.
EMC Guidance
This equipment complies with IEC 60601-1-2 (2007). However, if portable transmitter or wireless
LAN equipment is used extremely nearby, the electromagnetic influence may largely exceed the
compliance level and may cause unexpected phenomenon such as noise interference on the
waveform, etc.
Therefore, this equipment should be used in a location specified by each medical institution. If any
unexpected noise interference on the waveform or failure to the peripheral device occurs, stop
using the equipment and follow the instruction of the technician.
The following is the information relating to EMC (Electromagnetic Compatibility).
(When using this equipment, verify that it is used within the environment specified below.)

xii
●Compliance to the Electromagnetic Emissions
The LX-7120 is intended for use in the electromagnetic environment specified below. The customer
or the user of the LX-7120 should assure that it is used in such an environment.
Emissions Test Compliance Electromagnetic Environment - Guidance
RF Emissions
CISPR 11 Group 1
The LX-7120 uses RF energy only for its internal function.
Therefore, its RF emissions are very low and are not likely to
cause any interference in nearby electronic equipment.
RF Emissions
CISPR 11 Class A
Harmonic Emission
IEC 61000-3-2 N/A
Voltage Limit /
Flicker Emission
IEC 61000-3-3
N/A
This LX-7120 is suitable for use in all establishments other than
domestic establishments.
●Compliance to the Electromagnetic Immunity (1)
The LX-7120 is intended for use in the electromagnetic environment specified below. The customer
or the user of the LX-7120 should assure that it is used in such an environment.
Immunity Test IEC60601-1-2
Test Level Compliance Level Electromagnetic Environment -
Guidance
Electrostatic
Discharge (ESD)
IEC 61000-4-2
±6kV contact
±8kV air
±6kV contact
±8kV air
Floors should be wood, concrete or
ceramic tile. If floors are covered with
synthetic material, the relative humidity
should be at least 30%.
Electrical fast
transient / burst
IEC 61000-4-4
±2kV:
Power supply lines
±1kV:
Input/output lines
N/A
Surge
IEC 61000-4-5
±1kV:
differential mode
±2kV:
common mode
N/A
Voltage dips,
short interruptions
and voltage
variations on
power supply
input lines.
IEC 61000-4-11
<5% UT
(>95% dip in UT)
for 0.5 cycle
40% UT
(60% dip in UT)
for 5 cycles
70% UT
(30% dip in UT)
for 25 cycles
<5% UT
(>95% dip in UT)
for 5sec.
N/A
Power Frequency
(50/60Hz)
Magnetic Field
IEC 61000-4-8
3A/m 3A/m
Power frequency magnetic fields
should be at levels characteristic of a
typical location in a typical commercial
or hospital environment.
Note : UTis the AC mains voltage prior to application of the test level.

xiii
●Compliance to the Electromagnetic Immunity (2)
The LX-7120 is intended for use in the electromagnetic environment specified below. The customer
or the user of the LX-7120 should assure that it is used in such an environment.
Immunity Test IEC60601-1-2
Test Level
Compliance
Level Electromagnetic Environment - Guidance
Portable and mobile RF communications
equipment should be used no closer to any part
of the LX-7120, including cables, than the
recommended separation distance calculated
from the equation applicable to the frequency of
the transmitter.
Recommended Separation Distance
Conducted RF
IEC 61000-4-6
3Vrms
150kHz to 80MHz 3Vrms d = 1.2 P
Radiated RF
IEC 61000-4-3
3V/m
80MHz to 2.5GHz 3V/m
d = 1.2 P80MHz to 800MHz
d = 2.3 P800MHz to 2.5GHz
Where P is the maximum output power rating of
the transmitter in watts (W) according to the
transmitter manufacturer and d is the
recommended separation distance in meters
(m).
Field strengths from fixed RF transmitters, as
determined by an electromagnetic site survey a),
should be less than the compliance level in each
frequency range b).
Interference may occur in the vicinity of
equipment marked with the following symbol:
Note 1 : At 80MHz and 800MHz, the higher frequency range applies.
Note 2 : These guidelines may not apply in all situations. Electromagnetic propagation is affected
by absorption and reflection from structures, objects and people.
a) Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless)
telephones and land mobile radios, amateur radio, AM and FM radio broadcast and TV broadcast
cannot be predicted theoretically with accuracy. To assess the electromagnetic environment due
to fixed RF transmitters, an electromagnetic site survey should be considered. If the measured
field strength in the location in which the LX-7120 is used exceeds the applicable RF compliance
level above, the LX-7120 should be observed to verify normal operation. If abnormal performance
is observed, additional measures may be necessary, such as re-orienting or relocating the
LX-7120.
b) Over the frequency range 150kHz to 80MHz, field strength should be less than 3V/m.

xiv
●Recommended Separation Distances between Portable and Mobile RF
Communications Equipment and the LX-7120
The LX-7120 is intended for use in an environment in which radiated RF disturbances are
controlled. The customer or the user of the LX-7120 can help prevent electromagnetic interference
by maintaining a minimum distance between portable and mobile RF communications equipment
(transmitters) and the LX-7120 as recommended below, according to the maximum output power of
the communications equipment.
Separation Distance according to Frequency of Transmitter (m)
Rated Maximum
Output Power of
Transmitter
（
W
）
150kHz to 80MHz
d = 1.2 P
80MHz to 800MHz
d = 1.2 P
800MHz to 2.5GHz
d = 2.3 P
0.01 0.12 0.12 0.23
0.1 0.38 0.38 0.73
1 1.2 1.2 2.3
10 3.8 3.8 7.3
100 12 12 23
For transmitters rated at a maximum output power not listed above, the recommended separation
distance d in meters (m) can be determined using the equation applicable to the frequency of the
transmitter, where P is the maximum output power rating of the transmitter in watts (W) according
to the transmitter manufacturer.
Note 1 : At 80MHz and 800MHz, the separation distance for the higher frequency range applies.
Note 2 : These guidelines may not apply in all situations. Electromagnetic propagation is affected
by absorption and reflection from structures, objects and people.

xv
Contents
Preface
1. General Description Provides an overview of the LX-7120.
2. Specification & Accessories Lists electrical / mechanical specification and accessories.
3. Optional Settings Explains procedure of optional settings.
4. Spare Parts List Lists the consumable parts.
5. Assembly Diagram Consists of assembly diagram of the LX-7120.
6. Troubleshooting Explains check items and procedures for each trouble
situation.
7. Maintenance Explains the replacing procedure of the spare parts and
cleaning for maintenance.
8. Periodic Check Explains periodic check procedures.

xvi
Preface
Safety Precautions························································ii
Graphic Symbols ······················································· ii
Precautions for Safe Operation of Medical Electrical
Equipment ································································ iv
Non-Explosion Proof··················································v
Precautions about Magnetic Resonance Imaging
(MRI) ·········································································v
Electrosurgery Safety ················································v
Defibrillation Safety··················································· vi
Precautions about the Pacemaker···························· vi
Precautions about the LX-7120 ······························· vii
Precautions about Waterproof ································· vii
Precautions about ECG··········································· vii
Precautions about Output Signal ···························· viii
Precautions about Accessories and Optional
Accessories ···························································· viii
Precautions about Battery ······································ viii
Precautions about Disposing of Equipment,
Accessories, or Components·································· viii
Precautions about Disposing of Battery·················· viii
Precautions for Use of Medical Telemeter················ ix
Precautions about the Maintenance ··························x
Electromagnetic Compatibility····································xi
Precautions for Safe Operation under Electromagnetic
Influence··································································· xi
EMC Guidance ························································· xi
●Compliance to the Electromagnetic Emissions
······································································· xii
●Compliance to the Electromagnetic Immunity (1)
······································································· xii
●Compliance to the Electromagnetic Immunity (2)
······································································ xiii
●Recommended Separation Distances between
Portable and Mobile RF Communications
Equipment and the LX-7120·························· xiv
1. General Description
General Description ·················································· 1-2
External Appearance ············································· 1-2
Names of Parts and Their Functions······················· 1-3
2. Specification & Accessories
Specification······························································ 2-2
Standard Specification··········································· 2-2
ECG······································································· 2-2
Respiration (Impedance Method) ·························· 2-2
Transmission Method ············································ 2-3
Safety ···································································· 2-3
Operating Environment·········································· 2-3
Transport / Storage Environment··························· 2-3
List of Setup Items ···················································· 2-4
Standard and Optional Accessories························ 2-5
Standard Accessories············································ 2-5
Optional Accessories············································· 2-6
●ECG, Impedance Respiration Measurement 2-6
3. Optional Settings
Change Procedure for Optional Settings·················3-2
Entering to the Preset Screen ································3-3
Changing the Time Constant··································3-4
Changing the Detection Sensitivity of the Pacemaker
Pulse ······································································3-5
Changing the QRS detection mode ························3-7
Changing the Respiration Detection Signal ON/OFF
···············································································3-8
Changing the LCD Contrast ·································3-10
Changing the Transmitter Channel·······················3-11
Changing the Transmitter Group ID······················3-13
4. Spare Parts List
Spare Parts List··························································4-2
Field Service Parts ·····················································4-3
Main Unit Component ················································4-4
Internal Cables ···························································4-5
Screws ········································································4-6
5. Assembly Diagram
LX-7120 Assembly Drawing ······································5-2
6. Troubleshooting
List of Displayed Status ············································6-2
Transmitter (main unit) ···········································6-2
ECG········································································6-2
List of Displayed messages ······································6-3
Details of the “ELECTRODE?” Message··················6-4
Troubleshooting·························································6-6
Transmitter (main unit) ···········································6-6
ECG········································································6-6
In Case of Dropping the LX-7120 into Water············6-7
7. Maintenance
Servicing·····································································7-2
Replacing procedure of the Spare Parts··················7-3
Replacing the Battery Compartment Lid·················7-3
Replacing the Rubber Cap ·····································7-4
Replacing the Rear Panel·······································7-5
Replacing the Main Unit Case with Battery Contacts
···············································································7-6
Replacing the Analog Board and LCD Board ·······7-12
Replacing the LCD and LCD Protective Case ······7-14
Cleaning and Disinfection ·······································7-15
Cleaning and Disinfecting the LX-7120 ················7-15
Cleaning the ECG lead cable ·······························7-16