NINGBO DAVID HKN-9010 User manual

EDITION/REVISION A/0
NINGBO DAVID
SERVICE MANUAL
HKN-9010
INFANT RADIANT WARMER
R

NINGBO DAVID MEDICAL DEVICE CO., LTD.
ADD: NO.158 DAQING ROAD, SHIPU, NINGBO, ZHEJIANG PROVINCE, CHINA
POST CODE: 315731 FAX: [phone]
MARKETING CENTER: NO. 11, ALLEY 722 SANGTIAN ROAD NINGBO, ZHEJIANG
POST CODE: 315040
TEL: [phone] FAX: [phone]
E-MAIL: [email protected] [email protected]
WEBSITE: http://www.nbdavid.com
EUROPEAN REPRESENTATIVE: SHANGHAI INTERNATIONAL HOLDING CORP. GMBH (EUROPE)
ADD: EIFFESTRASSE 80, 20537 HAMBURG, GERMANY
TEL: [phone] FAX: [phone]
EDITION/REVISION A/0

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SERVICE MANUAL FOR INFANT RADIANT WARMER EDITION/REVISION A/0
WARRANTY
The product being described in this manual is warranted against defects in materials or
workmanship for one year from the date of shipment, with the following exceptions.
1. All consumable and disposable products are guaranteed to be free from defects upon shipment
only.
2. Calibrations are considered normal maintenance and are not included in the 1-year warranty.
During the warranty period any defective parts other than those listed above will be replaced at no charge
to the customer. This warranty is rendered void and our company cannot be held liable for conditions
resultant there from if:
1. Damage to the unit is incurred as a result of mishandling.
2. The customer fails to maintain the unit in a proper manner.
3. The customer uses any parts, accessories, or fittings not specified or sold by our company.
4. Sale or service is performed by the non-certified service/dealer agency.
This warranty is in lieu of all other warranties, expressed or implied, and our company shall in no
event be liable for incidental or consequential damages including loss of use, property damage, or
personal injury resulting from breach of warranty.
Please test each piece of equipment prior to initial use and at least annually thereafter. To comply
with this standard, we recommend that you participate in our training program before selling it. This
service can be performed by certified technicians through our Product Service Group and authorized
dealers.
SERVICE
For optimal performance, product service should be performed only by qualified service personnel.
Technical Services representatives can be reached for fixations and are dispatched for required
maintenance by calling 0086-574-87800008, 87800009. Customers outside China should contact their
local factory-authorized distributor for service.

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SERVICE MANUAL FOR INFANT RADIANT WARMER EDITION/REVISION A/0
COMPLEMENTARY NOTICE
Since Ningbo David, conducts a continuous product improvement program, circuit and component
improvements are sometimes incorporated into equipment before they can be incorporated into the
printed manuals. This manual contains proprietary information, repairs and authorized modifications
should be performed only by qualified service personnel to maintain your warranty and to avoid creating
safety hazards. We cannot assume responsibility for any conditions affecting the proper operation of this
equipment which may result from unauthorized repair modification. Therefore, some parts used in your
equipment may be different than those which appear in the parts list of this manual. This sometimes
occurs due to difficulty in parts procurement, but does not alter the function of the equipment
The device, accessories and the packaging have to be disposed of waste correctly at the end of the
usage. Please follow Local Ordinances or Regulations for disposal.

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SERVICE MANUAL FOR INFANT RADIANT WARMER EDITION/REVISION A/0
TABLE OF DEFINITIONS AND SYMBOLS
TECHNICAL DEFINITIONS
SKIN TEMPERATURE SENSOR: A sensing device including the link with the equipment intended to
measure the infant’s baby temperature.
CONTROL TEMPERATURE: The preventative control temperature to the temperature control.
PRE-WARM MODE: A warm mode which can keep the mattress at a properly temperature. The heater
output will work automatically according to the set programme in this mode.
MANUAL MODE: A operation mode of in which the heater output is either at a fixed level or a
proportion of its maximum output set by the operator.
BABY MODE: A mode of operation in which the power output varies automatically in response to the
temperature of the baby, to achieve a temperature close to a value set by the operator.
STEADY TEMPERATURE CONDITION: A condition which is reached when the temperature, measured
at the center of the TEST DEVICE positioned on the mid point of the EQUIPMENT mattress, does not
vary by more than 1℃over a period of 1 hour.
TEMPERATURE ALARM CHECKOUT STATE: The difference between the indicated temperature and
control temperature is within ±0.5℃and such state lasts for over 10 minutes. When checkout the
temperature alarm function, operation should be enter this state.
APGAR TIMER: It offers the functions of three periods alarming indication: 1min, 5min, and 10min for
clinical treatment.
NOTE, IMPORTANT, CAUTION AND WARNING
NOTE: A note is inserted in text to point out procedures or conditions, which may otherwise be
misinterpreted or overlooked. A note may also be used to clarify apparently contradictory or
confusing situations.
IMPORTANT: Similar to a Note but be used where greater emphasis is required.
CAUTION: A caution is inserted in text to call attention of a procedure which, It not followed exactly, can
lead to damage or destruction of the equipment.
WARNING: A warning is inserted in text to call attention to dangerous or hazardous conditions
inherent to the operation, cleaning, and maintenance of the equipment which may
result in personal Injury or death of the operator or patient.

SERVICE MANUAL FOR INFANT RADIANT WARMER EDITION/REVISION A/0
SYMBOLS
Attention, Consult Accompanying Documents.
Input Power Type F Fuse 4AH/250V
Type T Fuse 400mAL/250V
Type T Fuse 800mAL/250V
Type T Fuse160mAL/250V Heater Power Indicator
Data Communication Connector
Load Symbol
On (Power: Connection to the mains)
Off (Power: Disconnection to the mains)
On (only for a part of equipment)
Off (only for a part of equipment)
Class I Equipment Type BF Applied Part
Protective Earth (ground) Earth (ground)
APGAR Timer Key Timer Key
Set Up Key Set Down Key
Keypad Lock Key Calibration Key
Silence/Reset Key Mode Select Key
Date of Manufacture Serial Number
CE Marking
Danger! High Voltage!
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SERVICE MANUAL FOR INFANT RADIANT WARMER EDITION/REVISION A/0
SEASONAL SAFETY CHECK
1. Please clean the plug of power cord at least once a year. Too much dust on plug may cause the fire.
2. The following safety checks should be performed at least every 12 months by a qualified person who
has adequate training, knowledge, and practical experience to perform these tests. 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.
○
1. Inspect the equipment and accessories for mechanical and functional damage.
○
2. Inspect the safety relevant labels for legibility.
○
3. Inspect the fuse to verify compliance with rated current and breaking characteristics.
○
4. Verify that the device functions properly as described in the instructions for use.
○
5. Test the protection earth resistance according IEC 60601-1:1988 + A1:1991 + A2:1995: Limit
0.1Ω.
○
6. Test the earth leakage current according IEC 60601-1:1988 + A1:1991 + A2:1995: Limit: NC
500μA, SFC: 1000μA.
○
7. Test the enclosure leakage current according to IEC 60601-1:1988 + A1:1991 + A2:1995: Limit:
NC 100μA, SFC: 500μA.
○
8. Test the patient leakage current according IEC 60601-1:1988 + A1:1991 + A2:1995: Limit: for
a.c.: 100μA (BF), for d.c.: 10μA (BF).
○
9. Test the patient leakage current under single fault condition with mains voltage on the applied
part according IEC 60601-1:1988 + A1:1991 + A2:1995: Limit: for a.c.: 500μA (BF), for d.c.: 50μA (BF).
○
10 . Test the patient auxiliary leakage current according IEC 60601-1:1988 + A1:1991+ A2:1995:
Limit: NC for a.c.: 100μA (BF), for d.c.: 10μA (BF).SFC 500μA (BF), for d.c.: 50μA (BF).

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SERVICE MANUAL FOR INFANT RADIANT WARMER EDITION/REVISION A/0
TABLE OF CONTENTS
SECTION PAGE
1. GENERAL INTRODUCTION………………………………………………………………………………1-1
1.1 INTRODUCTION……………………………………………………………………………………………1-1
1.2 DESCRIPTION…………………………………………………………………………………...……… 1-1
1.3 COMPOSITION OF PRODUCTS………………………………………………………………...……… 1-1
2. INSTALLATION……………………………………………………………………………………………..2-1
2.1 UNPACKING…………………………………………………………………………………...………….2-1
2.2 INSTALLATION………………………………………………………………...………………….….…….2-1
2.3 OPERATION CHECKOUT PROCEDURE…………………………………...………………….….…….2-2
3. TECHNICAL INFORMATION………………………………………………………………………….…3-1
3.1 SPECIFICATION……………………………………………………………………………………………3-1
3.2 WORKING PRINCIPLE………………………………………………………………………...………….3-3
4. PREVENTATIVE MAINTENANCE………………………………………………………………………...4-1
4.1 GENERAL………………………………………………………………………………………………....4-1
4.2 CLEANING………………………………………………………………………………………...………...4-1
4.3 STERILIZATION……………………………………………………………………………...………...4-2
4.4 MAINTENANCE…………………………………………………………………………………………….4-3
5. SERVICE……………………………………………………………………………………………………...5-1
5.1 GENERAL………………………………………………………………………………………………….5-1
5.2 REPLACEMENT OF CHARGING BATTERY/FUSE/
QUARTZ HEATER/ILLUMINATION LIGHT……………………………………………………………….5-1
5.3 SYSTEM SETTING PROCEDURES……………………………………………………………………5-3
5.4 TROUBLESHOOTING PROCEDURES…………………………………………………………………5-6
6. REPLACEMENT PARTS……………………………………………………………………………………6-1
6.1 GENERAL……………………………………………………………………………………………6-1
7. DIAGRAMS …………………………………………………………………………………………………7-1
7.1 GENERAL …………………………………………………………………………………………………7-1

SERVICE MANUAL FOR INFANT RADIANT WARMER EDITION/REVISION A/0
SECTION 1
GENERAL INTRODUCTION
1.1 INTRODUCTION
This manual provides instructions for installation and maintenance of Infant Radiant Warmer. This
manual provides the guidance for the qualified service personnel.
1.2 DESCRIPTION
The Infant Radiant Warmer adopts 3 kinds of control mode: Pre-warm mode, Manual mode and
Baby mode. Once the device starts working, it can enter into the Pre-warm mode automatically without
pressing any key.
The setting temperature and baby temperature can be indicated separately.
Except for the listed parts in 1.3 the warmer also has the quartz halogen lamp, X-ray tray, and 4pcs
casters. (Two of them with brakes)
1.3 COMPOSITION OF PRODUCTS
The following diagram shows the main parts of the infant radiant warmer:
Warmer Module
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I.V.Pole Controller
Shelf
Bassinet
Stand

SERVICE MANUAL FOR INFANT RADIANT WARMER EDITION/REVISION A/0
DESCRIPTION OF PART EXPLANATION
Warmer Module
This main part is composed of the Heater, Reflective mantle, it is intended
to provide the radiation for electromagnetic spectrum infrared range with
weight of 10Kg, and its angle can be adjusted horizontal in two ways. The
lifetime of heater is 2000hrs.
I.V. Pole A kind of bearing part, which is used for hanging the infusion bottle.
Max. Load: 2Kg
Controller
The core part with 3 temperature control mode: pre-warm mode, manual
mode, baby mode, APGAR timer, timing function, and it is used for
automatic controlling of infrared radiation heat output, please refer to the
user's manual.
Shelf A kind of bearing part, which is used for putting some small objects.
Max. Load: 2 Kg
Bassinet
It is used for place the infant. The bassinet can be tilted. Max. Load: 10
Kg. This bassinet is equipped with 4pcs of panels to avoid the patient
falling off.
Size of mattress: W655mm×D510mm
Stand It provides a mounting for the Warmer Module and Bassinet.
The distance from bed to the floor: 900mm
NOTE: 1. Size of whole unit: W1070×H1820×D760mm
2. Weight: 70Kg
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OPERATOR’SMANUALFORINFANTRADIANTWARMER EDITION/REVISION A/0
SECTION 2
INSTALLATION
2.1 UNPACKING
Generally, the WARMER is usually packed to one carton. When taking out the equipment from the
cartons, take care not to damage the spare parts of the WARMER.
2.2 INSTALLATION
At least two professionals are required to do the installation of the WARMER with spanners.
Installation step:
A. Connection between the warmer module and stand.
①Unscrew the pan head bolt M5X20, Spring washerΦ5, Flat washerΦ5 and external teeth
serrated lock washers Φ5 on the upper column with the screwdriver.
②Install the lower column with upper column as the direction indicated in figure 2.1, and fix them
with the pan head bolt M5X20, Spring washerΦ5, Flat washerΦ5 and external teeth serrated lock
washers Φ5.
Upper Column
Lower Column
FIGURE 2.1
③Install the back cover for upper column with upper column as the figure 2.2, and fix them with
the pan head bolt M5X20,Spring washerΦ5,Flat washerΦ5 and external teeth serrated lock washers Φ5
on its original position.
Back cover for upper column
FIGURE 2.2
IMPORTANT: Please make sure that the upper column and the stand are vertical, or else, it will
affect the temperature uniformity on the mattress.

OPERATOR’SMANUALFORINFANTRADIANTWARMER EDITION/REVISION A/0
B. Install the panel
Insert the panel into the Fixed seat as the arrow indicates in figure 2.3.1, and turn it upward to make
it vertical and press it as the figure 2.3.2 indicates.
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1
车Panel
Fixed Seat For Panel
FIGURE2.3.1 FIGURE2.3.2
NOTE: 1.Total 4 pieces panels; the panel with groove is the back panel.
2. Make the bassinet tilt when installing the back panel.
C. Install Shelf and I.V. Pole
Fix the tray on the upper column in figure 2.4.1. with the pan head bolt M4X12, Spring washerΦ4,
Flat washerΦ4 with screwdriver; See figure 2.4.2, install the I.V. Pole on the upper column, and tighten
the bolt with clamp.
Shelf
Tightening Clamp
FIGURE2.4.1 FIGURE2.4.2
D. Insert the power cord
Insert the power cord into the mains power socket.
Check the WARMER according to the instruction in section 2.3.
2.3 OPERATION CHECKOUT PROCEDURE
Please follow the below operation checkout procedure before use.
A. Check casters
Check whether the caster can drop when lifting the radiant warmer 2cm above the ground. The drop
of the caster will cause danger during transporting.

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SERVICE MANUAL FOR INFANT RADIANT WARMER EDITION/REVISION A/0
IMPORTANT: At least two persons are required, one lifts the warmers, and the other has to check
the casters. It needs Min. 70Kg to light the whole unit. Please support the stand
with block to avoid the warmer inclining if the casters drop.
B. CHECK POWER FAILURE ALARM
When the general power supply and the switch of controller are turned off, pull off the power cord of
whole unit, the Power failure alarm should active, and the “Power” light will flash with continuous
audible sound.
This operation is used for checking if the power failure is normal or not. Insert the power cord again
or switch off the controller to silence alarming after finishing checking.
IMPORTANT: Please make sure that the internal charging battery is full before use it. If it is not
full, it may cause the power failure without any alarming. If the battery is full, and
there is no hint when disconnect the power cord, please refer to the qualified
service personnel.
C. START-UP THE CONTROLLER
Turn on the switch of the main power supply and controller, the controller performs a long period
sound “ringing” .All indicators are on, at this time, the device can do self-test automatically for 5s. After
then, the Set temperature indicator will display “--.-”, at the same time, the Baby temperature indicator
displays the baby temperature, and the timer indicates the current time, and the controller can enter into
the pre-warm mode automatically, and the pre-warm light will be on. If one of them does not work, or the
indication is incomplete, please refer to the qualified service personnel.
D. CHECK WORKING MODE
Place the skin sensor on the central of mattress, a①nd record the baby temperature in the cold
stare, and then start the warmer to make the device enter into the pre-warm mode automatically for
30min, and please read the baby temperature to compare the indicated temperature after pre-warm and
the one in the cold state, it should not less than 4 . If not, please replace the heater.℃
please select the manual control mode, the system default of heat output proportion is 30%,②
there is 3grades in the heat indicator, press Up or Down key to adjust the value within range of 0%-100%.
Please set the heat output proportion ＞30%. There is alarm every 15min, “CHECK” alarm light flashes,
and the set temperature indicator displays alarm code E0.9, press Silence/Reset key to silence
alarming. The device still works according to the current mode and heat output proportion. If do not press
Silence/Reset key when “CHECK” alarm actives, the device will decrease the heat output proportion to
30% in 1min. If not, please refer to the qualified service personnel.

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SERVICE MANUAL FOR INFANT RADIANT WARMER EDITION/REVISION A/0
③In Baby mode, pull off the skin sensor, the audible and visual alarm will occur, the alarm light of
sensor and the set temperature indicator will show alarm code E0.1. Press Silence/Reset key to
silence alarming for 4min. Connect again the skin sensor, the device will come back to the normal
working condition.
E. CHECK SETTING ALARM
In Baby mode, put the skin sensor into the water cup at temperature lower 3.5℃than the set
temperature for 2min, the setting temperature alarm will active. The “Set” light should flash with
continuous audible sound, and the set temperature indicator will show alarm code E0.7. Press
silence/reset key to silence alarming for 4min.
Set the temperature at 36℃,after the device enters into the temperature alarming checkout state,
put the skin sensor into the water cup at temperature 35.3℃±0.1℃for 3min, the setting temperature
alarm will active. The “Set” light should flash with continuous audible sound, and the set temperature
indicator will show alarm code E0.8. Press Silence/Reset key to silence alarming for 4min.
F. CHECK DEVIATION ALARM
In baby mode, set the temperature at 35.0 ºC. Enter temperature alarm checkout state; put the
skin sensor into the water cup at 37 ºC. When the indicated temperature reaches 36.0 ºC, the upper
deviation alarm will active. The “H/L” light should flash with continuous audible sound, and the set
temperature indicator should show alarm code E0.5; Set the temperature at 35.0℃, after the device
enters into the temperature alarming checkout state, put the skin sensor into the water cup at
temperature 33℃, when the indicated temperature decreases to 34.0 ºC, the lower deviation alarm
should active. The “H/L” light should flash with continuous audible sound, and the set temperature
indicator should show alarm code E0.6. Press Silence/Reset key to silence alarming for 4min.
NOTE: If the system can not enter into the temperature alarm checkout state or the baby
temperature does vary ±1℃than the setting temperature, the deviation alarm can
not occur.
G. CHECK OVER-TEMPERATURE ALARM
In baby mode, put the skin sensor into the water cups at 39.5℃±0.5℃, the over-temperature alarm
should active. The “Over” light should flash with continuous audible sound, and the Set temperature
indicator should show alarm code E0.4. Press Silence/Reset key to silence alarming for 4min. Reduce
the baby temperature and press Silence/Reset key to silence alarming.
H. CHECK APGAR TIMER
When the temperature controller is under the normal working state, press the Timer mode key, and
select the APGAR mode, and the relevant indicator is on, the timer start to indicate from 0s, when the
timer indicates 50”～1’, 4’50”～5’, 9’50”～10’, it sounds “du…”, at the same time, the APGAR timer is
flashing. If not, please refer to the qualified service personnel.

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SERVICE MANUAL FOR INFANT RADIANT WARMER EDITION/REVISION A/0
I. CHECK THE TIMER
Under the normal working condition, press to indicate the current running time, If the indicated time
is not accurate, please reset, and the specific setting method is as follows:
Press the timer key, at the same time, turn on the controller for 3min, loosen the key when the
indicated setting interface appears.
At this time, Set temperature indicator shows the setting code, baby temperature indicator will
indicate the relevant value (as for setting code, setting item and setting range, please refer to the
following table ), the timer indicator will indicates P002(it means it has entered into the setting interface).
Operator can choose the setting items by pressing the Timer key or APGAR Timer key, and press the
up and Down key to choose the data setting. After then, press the set key to store the setting value, or
you can press the Silence/Reset key to store and exit after finishing all setting procedure. If turn off the
power supply without pressing the Silence/Reset key, and this setting is invalid, and system will store
the previous setting value.
TIME SET CODE
SETTING CODE INDICATED ITEM SET RANGE
001 The former two figure of year 19 ~20
002 The latter two figure of year 00 ~99
003 month 01 ~12
004 date 01 ~31
005 week 01~07（01means Sunday）
006 hour 00~23(24hrs)
007 minute 00~59
008 second 00~59
J. CHECK BASSINET TILT MACHANISM
Move the angle adjustament machanism under the bassinet to adjust the bassinet tilt.
Angle Adjustament Machanism

SERVICE MANUAL FOR INFANT RADIANT WARMER EDITION/REVISION A/0
K. CHECK THE ADJUSTMENT FUNCTION OF ANGLE OF WARMER MODULE
Move the warmer moduel to rotate it at horizon angle.
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L. CHECK ILLUMINATION LIGHT
Turn on the power switch of illumination light, and the light will be on.
M.CHECK THE PANEL
Push and pull the panel and check if the panels are firm or not.
N. CHECK X-RAY TRAY
Push and pull the X-ray tray to check the working condition.
O. CHECK I.V. POLE
Check if the I.V. Pole stand is tightening or not.
P. End

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SERVICE MANUAL FOR INFANT RADIANT WARMER EDITION/REVISION A/0
SECTION 3
TECHNICAL INFORMATION
3.1 SPECIFICATION
Specifications for the Radiant Warmer with model HKN-9010 are provided in table 3.1. All
specifications are subject to change without notice.
TABLE 3.1 SPECIFICATIONS
Power Requirements……………………………………………………………………AC220V-230V/50Hz
Maximum Power Output………………………………………………………………………………600W
Maximum Heater Power Output………………………………………………………540VA/240V
Heater power display…………………………………………0 to 100%, adjustable in 10% increments
Protective earthed resistance……………………………………………………………………＜0.1Ω
Earth leakage current …………………………………………………………………………N.C.:＜0.5mA
S.F.C.:＜1mA
Patient leakage current ………………………………………………………………………N.C.:＜0.1mA
S.F.C.:＜0.5mA
Patient Leakage Current (MAINS VOLTAGE ON THE APPLIED PART) ………………S.F.C: ＜5mA
This equipment belongs to Class I, Type BF applied part, normal device（IP20）continuously operated.
TEMPERATURE CONTROL RANGE AND ITS SPECIFCIATION
Temperature control range……………………………………………………………………34.5 ~37.5℃℃
Baby Temperature display range………………………………………………………………5~65℃℃
Deviation between baby temperature and control temperature…………………………………≤0.5℃
Accuracy of skin temperature sensor………………………………………………………………≤0.3℃
Temperature uniformity of mattress……………………………………………………………………≤2℃
ALARM (See table 3.2)
General Power alarm
Detecting baby temperature Probe failure
disconnection of skin sensor………………………………………………………………Alarm code E0.1
The probe for over-temp failure…………………………………………………………Alarm code E0.2
Deviation of two probes failure……………………………………………………………Alarm code E0.3
Over-temp alarm for skin sensor………………………………………………………… Alarm code E0.4
Upper deviation alarm………………………………………………………………………Alarm code E0.5
Lower deviation alarm………………………………………………………………………Alarm code E0.6
Wrong temperature set alarm in baby mode……………………………………………Alarm code E0.7

SERVICE MANUAL FOR INFANT RADIANT WARMER EDITION/REVISION A/0
TABLE 1.1 SPECIFICATIONS (continued)
The sensor position alarm in baby mode………………………………………………Alarm code E0.8
The tip every min in manual mode……………………………………………………Alarm code E0.9
Internal system failure…………………………………………………….……..Alarm code H0.1～H1.1
ENVIRONMENT TEMPERATURE
Operating Range………………………………………………….……..……………………+18℃～+30℃
Storage Range……..………………………………………………….……………………… -40℃～+55℃
ENVIRONMENT HUMIDITY
Operating Range…………………………………………………………………30%RH～75%RH
Storage Range………………………………………………………………………………………≤93%RH
ATMOSPHERE PRESSURE
Shipment and store atmospheric pressure range…………………………………500hPa~1060hPa
Working atmospheric pressure range…………………………………………………700hPa~1060hPa
AIR FLOW RATE
AMBIENT AIR MOVEMENT RATE………………………………………………………………… <0.3M/S
OTHER SPECIFICATION
Working noise…………………………………………Ambient noise≤40dB(A), working noise≤50dB(A)
APGAR Timer…………………………………………………………………………………Tones at 50” ～1’,
4’50”～5’, 9’50”～10’
ALARM NOISE…………………………………………………………………………… ≤80dB(A) on mattress
SILENCE/RESET KEY
Press to silence the alarming, press twice to reset alarming.
Silence………………………………………………………………………………silence alarming for 4min,
alamring will silence if there is any other alarming actives
Reset………………………………………………silence alarming to come back to the setting state
The lifetime ……………………………………………………………………………………………8 years
(Lifetime means the period from sell-by date to the date of discarding as useless.)
FACTORY DEFAULT SETTING (ORIGINAL STATE)
Heater mode…………………………………………………………………………………Pre-warm mode
Heater output proportion under Manual mode ……………………………………………………… 30%
Set temperature under baby mode……………………………………………………………………36℃
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SERVICE MANUAL FOR INFANT RADIANT WARMER EDITION/REVISION A/0
3.2 WORKING PRINCIPLE
3.2.1 GENERAL
This section covers the function and the working principle, as for the figure for control system,
please refer to figure 3.2 and 3.3.
Surface temperature on mattress can be reached during the radiant system in figure 3.1, the radiant
heater outputs in the way of fixed proportion to make the body temperature of patient resume; in Baby
mode, the device will adjust the heat output proportion automatically by comparing the baby temperature
and the set temperature to keep the heat balance.
NOTE: During the process of getting the radiation and heat, the losing heat in convection,
evaporation, radiation, conduction will affect the heat balance. Therefore, to make the
baby decrease the dissipation, it is necessary to use the device in the environment of no
rapid air flowing ,and cover waterproof velum (polyethylene velum) the naked skin or to
use the waterproof net to increase the humidity around the skin to decrease the water
evaporation.
FIGURE 3.1 RADIATION PRINCIPLES

SERVICE MANUAL FOR INFANT RADIANT WARMER EDITION/REVISION A/0
A
MIAN
MCU
3-4
B
Heat control output
Output Port
Over-temp checking probe of skin sensorA/D
Auxiliary
MCU
Communication connector
Temperature control probe of skin sensorA/D
Temperature indication
Heat control output
Function alarm
Output port
Keypad control
Figure 3.2 Control Block Diagram
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