Huvitz HNT-1 User manual

Service Manual
Non-Contact Tonometer HNT-1 / 1P

-------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P 1
Ver. 1.0.1
© 2016 - 2017 Huvitz Co., Ltd.
(HQs) 38, Burim-ro 170beon-gil, Dongan-gu, Anyang-si, Gyeonggi-do, 14055, Republic of
Korea
Manufacturer : Huvitz
38, Burim-ro 170beon-gil, Dongan-gu, Anyang-si, Gyeonggi-do, 14055, Republic of Korea
Huvitz has the copyright to this document.
Parts or all of this user manual cannot be duplicated without Huvitz’s permission in accordance
to the copyright law.

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Contents
1. Important Notice................................................................................................................... 3
2. Safety Information ................................................................................................................ 4
3. Product Outline...................................................................................................................12
3-1. Main Parts.................................................................................................................12
3-2. Optical System..........................................................................................................15
3-3. Electrical System...................................................................................................... 18
3-4. Measurement Flow...................................................................................................23
4. Repair Standard .................................................................................................................26
4-1. Checking and Control............................................................................................... 26
4-2. Disassembly and Assembly Procedure.................................................................... 46
5. Troubleshooting.................................................................................................................. 55

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1. Important Notice
This product may malfunction due to electromagnetic waves caused by portable personal
telephones, transceivers, radio-controlled toys, etc. Be sure to avoid having objects such as,
which affect this product, brought near the product.
The information in this publication has been carefully checked and is believed to be
entirely accurate at the time of publication. Huvitz assumes no responsibility, however, for
possible errors or omissions, or for any consequences resulting from the use of the
information contained herein.
Huvitz reserves the right to make changes in its products or product specifications at any
time and without prior notice, and is not required to update this documentation to reflect
such changes.

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2. Safety Information
2.1. Introduction
Safety is everyone’s responsibility. The safe use of this equipment is largely dependent upon
the installer, user, operator, and maintainer. It is imperative that personnel study and become
familiar with this entire manual before attempting to install use, clean, service or adjust this
equipment and any associated accessories. It is paramount that the instructions contained in
this manual are fully understood and followed to enhance safety to the patient and the
user/operator. It is for this reason that the following safety notices have been placed
appropriately within the text of this manual to highlight safety related information or
information requiring special emphasis. All users, operators, and maintainers must be familiar
with and pay particular attention to all Warnings and Cautions incorporated herein.
"Warning,” indicates the presence of a hazard that could result in severe personal
injury, death or substantial property damage if ignored.
NOTE
"Note,” describes information for the installation, operation, or maintenance of which
is important but hazard related if ignored.
“Caution” indicates the presence of a hazard that could result in minor injury, or
property damaged if ignored.
!
WARNING
!
CAUTION

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2.2. Safety Symbol
The International Electro technical Commission (IEC) has established a set of symbols for
medical electronic equipment, which classify a connection or warn of any potential hazards.
The classifications and symbols are shown below.
I and O on power switch represent ON and OFF
respectively.
Type B Isolated patient connection.
It indicates the connection of signal input/output.
This symbol identifies a safety note. Ensure you understand
the function of this control before using it. Control function is
described in the appropriate User’s or Service Manual.
Hot surface.
Identifies the point where the system safety ground is
fastened to the chassis. Protective earth connected to
conductive parts of Class I equipment for safety purposes.
Manufacturer
Authorised Representative in the European Community
CE for MDD
European Conformity Notified Body (TUV Rheinland) #: 0197
Date of manufacture
Serial Number
Temperature Limitation
Humidity Limitation

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Atmospheric Pressure Limitation
Consult instructions for use
Alternating Current
Dispose of Electrical and Electronic Equipment Correctly
This side up
Fragile , handle with care
Do not use hand hooks
Keep DRY
Stacking Limit by Number
Keep away from sunlight
CE for RoHS
Huvitz Symbol

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2.3. Environment related matters
Avoid the following environment for operation and storage :
Place where device comes directly into contact with moisture (do not
operate the device with wet hand)
Placewheredeviceisexposeddirectlytosunlight.
Place with severe temperature change (temperature for normal
operation ranges from 10C to 40C while humidity level ranges from
30% to75%).
Place where hot deviceiscloseby.
Placewherehumiditylevelishighandthereisaheatradiationrelatedproblem
Placewhere deviceisexposedtosevereshockorvibration
Avoid placing the device where it may come into contact with
chemical substance or place where there is flammable gas
Be careful so that dust or metallic substance does not go into the
inside of this device.
Do not disassemble or open the device. The manufacturer is not
responsible foranyproblem thatmayresultassuch.
Donotblocktheheatradiationlocatedatthe device’s upper part.

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Do not connect the AC power code while the device’s parts are not
connected completely. This damages the device.
Donotpulloutthepowercodewhileholdingjustthecode.
As for the environment when using the device, maintain temperature of 10 ~ 40 ℃, humidity
level of 30 ~ 75 % and atmospheric pressure of 800 ~ 1060 hpa.
As for the environment when transporting the device, maintain temperature of -40 ~ 70 ℃,
humidity level of 10 ~ 95 %, and atmospheric pressure of 500 ~ 1060 hpa.
As for the environment when storing the device, maintain temperature of –10 ~ 55 ℃, humidity
level of 30 ~ 75 %, and atmospheric pressure of 700 ~ 1060 hpa.
Take precaution so that the device won’t be subjected to excessive shock or vibration.

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2.4. Safety Precaution
This device was developed and proven according to the domestic and international safety
specs. This guarantees this device’s high safety level. By law, a manufacturer is obligated
to provide sufficient explanation of the matters pertaining to the device safety to device
users. Likewise, compliance with the contents of this device’s manual is mandatory for
safety sake. Thus, read the instructions in the manual sufficiently and understand prior to
turning on the power. For many more information, inquire the distributor where you
purchased the device.
1. Do not store or install this device at the following places; (a) place that runs the risk of
exploding, or (b) place that has volatile chemical substance such as alcohol benzene
or inflammable and explosive material.
2. Do not store or install at a humid place. To ensure normal operation, humidity level
should range between 30 and 75%. The device should not be exposed to a place
where water splashes significantly, water falls off, or gets sprayed. Do not place the
container with liquid or gas on top of the device.
3. This device should be operated by qualified personnel with sufficient training or under
such personnel’s supervision.
4. This device can be modified only by Huvitz’s service technician or a person with
comparable qualifications.
5. Device management by customer should be carried out as explained in the user or
service manual. Management that requires more sophisticated skill set can be carried
out only by Huvitz’s service technician or a person with comparable qualifications.
6. Manufacturer assumes responsibility for this device’s safety, reliability and
performance only when the following conditions are satisfied: (1) When this device was
installed at a viable space in accordance to this manual’s regulations, and (2) when
this device was used and maintained according to the procedure regulated in this
manual or service manual.
7. Manufacturer does not take responsibility for the damage resulting from this device’s
unlawful modification. However, device’s unlawful modification becomes a factor for
losing the right to get warranty during the warranty period.
8. This device is utilized with the accessories provided by Huvitz. If consumer wants to
use other manufacturers’ accessories, safety of use must be proven and confirmed by
Huvitz or by the accessories’ manufacturer.
9. Only a person who completed adequate training or education program can install,
operate and maintain this device.
10. Store user or service manual at a place that is readily accessible by the person who
manages and uses this device.
11. Do not exert force on the cable connection. If cable does not get connected easily,
then check whether connector (plug) is suitable for the socket. When connector or
socket is damaged, qualified service technician needs to repair it.
12. Do not pull on the device’s cable. Hold on the plug to take out to open up the cable.

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13. This device can be used according to this manual in relation to the refractive power,
corneal curvature measurement and their application.
14. Always test the state of the device’s external appearance and check whether it is
functioning well before using the device.
15. Do not block device’s hole for heat radiation.
16. Turn off the power immediately and take out the plug when there is smoke, spark,
abnormal noise or smell.
17. IEC standard needs to be satisfied with in order to connect an outside device with
input/output signal or other connector. (IT equipment is IEC 60950, and electric
equipment for medical use is IEC 60601). Moreover, all the systems need to satisfy the
safety requirement, IEC 60601-1-1 when it comes to the electric system for medical
use. Person who connects outside device with input/output signal or other connector
has the obligation to take responsibility in accordance to the IEC60601-1-1. Contact
local technician or distributor if you have doubts.
18. This equipment may cause edge which is hazardous for other devices at the periphery.
Wireless frequency may be generated or used, and energy may be released when the
device is not installed or used according to the guideline. However, there is no
guarantee that edge does not result when carrying out specific installation. If this
device leads to hazardous interception on other device when the equipment is turned
on/off, user needs to solve the interception issue by using one of the following
measures.
-Change direction or relocate the receiver
-Distance between equipment is increased
-Connect the equipment with the socket of the circuit connected with other device
and other circuit
-Ask manufacturing business or field service technician for help
For use of equipment in rated voltage less than 125Vac,minimum 6A,Type SJT or SVT ,
18/3AWG,10A, max 3.0m long : One end with Hospital Grade Type, NEMA 5-15P Other
end with appliance coupler. For use of equipment in rated voltage less than
250Vac,minimum 6A,Type SJT or SVT , 18/3AWG,10A, max 3.0m long : One end
terminated with blade attachment plug(HAR) Type, NEMA 6-15P.
!
CAUTION

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This equipment must be installed and operated in accordance with provided instructions
and the antenna(s) used for this transmitter must be installed to provide a separation
distance of at least 20 cm from all persons and must not be co-located or operating in
conjunction with any other antenna or transmitter. End-users and installers must be
provide with antenna installation instructions and transmitter operating conditions for
satisfying RF exposure compliance.

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3. Product Outline
3-1. Main Parts
1. LCD Touch Screen: Selectiong for measurement and function parts
2. Operation Lamp: Indicates whether or not the electric power is on
3. Printer: Printing the measured results
4. Measurement Button: A button pressed on to measure
5. Joystick Lever (Operation Lever):
A lever for moving object to the front and back, left
and right, and up and down
6. Stage Fixation Lerver: A lever for fixating stage
7. Safety Button: Safety distance establishment between patient and device

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1. Forehead Rest: Preventing the vibration by fixing the forehead.
2. Air Nozzle: Measuring the intraocular pressure on eyes.
3. Object lens for Pachy:
Object lens for measuring the cornea thickness of examinees.
(only in HNT-1P)
4. Chinrest: Preventing the vibration by fixing the chin.
5. High Adjustment Mark: Adjusts the eyes` height of examinees.
6. Power Switch: Switch for power on/off

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1. Power Supply Socket: A socket connecting to exterior power plug
2. Serial Interface Connector: A terminal connecting to the exterior equipment.

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HNT-1
3-2. Optical System
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6
①
②
②
③④⑤
③
④
④
⑤
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e
○
7
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8
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9
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10
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11
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12
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13
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14
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15
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16
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17
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18
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19
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19
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17
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20
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21
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22

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3-2-1. List of Optical Components
No.
Name
Function
○
1
Ext. LED
To illuminate eye for Observation Channel
○
2
App. LED
To measure the working distance(Z axis)
To measure the IOP
○
3
Aiming LED
To illuminate eye for detecting of eye center
○
4
Fixation LED
To illuminate the fixation target
○
5
Pachy. LED
To measure for the CCT(Central Cornea Thickness)
○
6
Air nozzle
Air Puffing nozzle
○
7
Aiming Mirror
To reflect the aiming LED to the Eye
○
8
Objective Lens
To image the Eye to the observation camera
○
9
Fix. Mirror
To reflect the fixation LED and Pachy. LED
○
10
Image Lens
To image the Eye to the observation camera
○
11
Observation Camera
The camera for the Observation channel
○
12
Signal Lens
To gather the applanation signal to the PD sensor
○
13
PD Mirror
To reflect the applanation signal to the PD sensor
○
14
PD Sensor
To detect the applanation signal
○
15
Psd Lens
To gather the reflection signal from the eye to the PSD sensor
○
16
Psd Sensor
To detect the working distance
○
17
Fixation Pinhole
○
18
Pachy. Prism
To reflect the fixation LED and to penetrate the Pachy. LED
○
23
○
24
○
25

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3-2-2. Light Paths of the System
Ａ: Eye Observation channel
(○
1○ e○ 7○ 8○ 9○ 10 ○ 11 )
Ｂ: Working distance sensing system (App LED & PSD sensor)
(○
2○ e○ 12 ○ 13 ○ 15 ○ 16 )
Ｃ: Applanation signal sensing system(App LED & PD sensor)
(○
2○ e○ 12 ○ 13 ○ 14 )
Ｄ: Eye center align(Aiming LED)
(○
3○ 7○ 6○ e○ 7○ 8○ 9○ 10 ○ 11 )
Ｅ: Fixation target
(○
4○ 17 ○ 18 ○ 19 ○ 9○ 8○ 7○ 6○ e)
Ｆ: Pachy. Illumination system
(○
5○ 20 ○ 21 ○ 22 ○ 18 ○ 19 ○ 9○ 8○ 7○ 6○ e)
G : Pachy. Image system
(○
e○ 23 ○ 24 ○
25 )
○
19
Fix. Lens
To deliver the Fixation LED to the Eye
○
20
Pachy. Ill. Lens
The lens for illuminate the Pachy. LED to the eye
○
21
Pachy. Slit
To make slit beam with the Pachy. LED
○
22
Pachy. Mirror
To reflect the Pachy. Slit beam to the eye
○
23
Pachy. Image Lens
To image the pachy.’s image to the Pachy. Camera
○
24
Pachy. Mirror 2
To reflect the pachy.’s image to the Pchy. Camera
○
25
Pachy. Camera
The camera for the Pachy. Measurement
○
e
Patient’s Eye
The Patient’s eye

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3-3. Electrical System
3-3-1. Electrical construction diagram
3-3-1-1. System functional block diagram
Touch
Interface
SMPS IN DC12V
LCD Interface
Z,CR,X,Y Motor
Printer Interface
Camera Interface

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3-3-1-2. Power input electrical block diagram