Huvitz HNT-1 Service Manual
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Huvitz HNT-1 Service Manual

Non-contact tonometer
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Non-Contact Tonometer HNT-1 / 1P

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  • Page 1 Service Manual Non-Contact Tonometer HNT-1 / 1P...
  • Page 2 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.

  • Page 3: Table Of Contents

    Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ 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.

  • Page 4: Important Notice

    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...

  • Page 5: Safety Information

    Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ 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.
  • Page 6 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P 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.
  • Page 7 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ 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...
  • Page 8 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P 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) Place where device is exposed directly to sunlight.
  • Page 9 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ Do not connect the AC power code while the device’s parts are not connected completely. T h i s d am ag es th e d e v ic e . Do not pull out the power code while holding just the code.
  • Page 10 This device should be operated by qualified personnel with sufficient training or under such personnel’s supervision. This device can be modified only by Huvitz’s service technician or a person with comparable qualifications. Device management by customer should be carried out as explained in the user or service manual.
  • Page 11 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ 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.
  • Page 12 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P 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.

  • Page 13: Product Outline

    Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ 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.
  • Page 14 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P 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.
  • Page 15 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ 1. Power Supply Socket: A socket connecting to exterior power plug 2. Serial Interface Connector: A terminal connecting to the exterior equipment.

  • Page 16: Optical System

    -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P 3-2. Optical System ① ③④⑤ ② ○ ○ ⑤ ④ ○ ○ ○ ○ ○ ④ ○ ○ ○ ○ ○ ○ ○ ○ HNT-1 ○ ○ ○ ○ ○ ② ③...
  • Page 17 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ ○ ○ ○ 3-2-1. List of Optical Components Name Function ○ Ext. LED To illuminate eye for Observation Channel ○ App. LED To measure the working distance(Z axis) To measure the IOP ○ Aiming LED To illuminate eye for detecting of eye center ○...
  • Page 18 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P ○ Fix. Lens To deliver the Fixation LED to the Eye ○ Pachy. Ill. Lens The lens for illuminate the Pachy. LED to the eye ○ Pachy. Slit To make slit beam with the Pachy. LED ○...

  • Page 19: Electrical System

    Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ 3-3. Electrical System 3-3-1. Electrical construction diagram 3-3-1-1. System functional block diagram LCD Interface Camera Interface Touch Interface Z,CR,X,Y Motor Printer Interface SMPS IN DC12V...
  • Page 20 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P 3-3-1-2. Power input electrical block diagram...
  • Page 21 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ 3-3-2-2. Description of wire harness connection of Main Board Connect Description (Connector number) Target connector Not used Not connect HARNESS(M2_OBS CMOS) OBS Camera HARNESS(M2_MB TO PACHY CMOS) Pachy Camera...
  • Page 22 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P HANRESS(M2_SMPS TO MB) SMPS HARNESS(M2_MB TO LCD 30P10P) TFT LCD HARNESS(M2_READY LED TO BD) Ready LED CN10 HARNESS(M2_Joy_Encoder) Joystick , Encoder CN11 HARNESS(M2_SAFTY PI) SAFTY PI CN13 HARNESS(M2_X_MOTOR) X Axis DC Motor CN14 HARNESS(M2_Z_MOTOR) Z Axis DC Motor...
  • Page 23 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ 3-3-3. Layout diagrams for PCB 3-3-3-1. Layout of Main Board 3-3-3-2.Description of IC components of Main Board Ref No. Part Name Description AM1808BZWT4 TI ARM MCU XC6SLX25-2FGG484C XILINX FPGA (Logic Array) SST39VF3201 NAND Flash Memory U5, U25...

  • Page 24: Measurement Flow

    -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P 3-4. Measurement Flow 3-4-1. Operation Flow Turn-on the power switch SELF TEST Trouble? Displayed error message Move to center Displayed initial screen Search for position of focus Move to position of measurement Pachy IOP or Pachy or...
  • Page 25 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ Stand by user input PRINTER USER SETUP MEASURE RESULT Change the user setup Print the result of measurement Display the result of measurement Save/Exit 3-4-2. Pachy measurement Flow Enable the Pachy LED Measure the Pachy Capture pachy image...
  • Page 26 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P 3-4-3. IOP measurement Flow Measure the IOP Control of SOLENOID Detect the signal of applanation Detect the pressure of inner part Displayed output of measurement Conversion of IOP...

  • Page 27: Repair Standard

    4. Repair Standard 4-1. Checking and Control 4-1-1. Engineer Setup Mode Turn on HNT-1/1P and pressing PRINT button -> R button -> L button -> Setup button until the measure mode screen is displayed. Then you could enter the engineer setup mode.
  • Page 28 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P (8) Touch Calibration - Calibrate touch screen. (9) Focus Align Test - Test to find focus LED(Ext.LED & Aim.LED) and distance. Long Run Test (10) - Test for motor aging. IQC Test (11) - Test for IQC.
  • Page 29 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ [Menu] (1) SEARCH OBS CAM WHITE DEAD PIXEL(HIDE) - Search for white dead pixels in OBS cameras and display their location. (2) SEARCH OBS CAM BLACK DEAD PIXEL(OPEN) - Search for black dead pixels in OBS cameras and display their location.
  • Page 30 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P The “+” button is incremented by 1. The “-“ button is decremented by 1. The “+++” button is quickly incremented by 10(current) or 50(time). iii. The “+++” button is quickly decremented by 10(current) or 50(time). (6) In the graphic mode, you can see the pressure results of the parameters set through the test.
  • Page 31 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ [Preparation] (1) REF Model Eye (2) Model Eye Stand [LED Brightness Adjustment] (1) Enter the Focus Led Setup Mode at Engineer Mode (2) In case of necessary, change LED Duty values at below Pachy LED(only HNT-1P)
  • Page 32 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P [Preparation] (1) IOP Model eyes(IOP 20, 30, 40, 50, 60) in SETUP kit (2) Stand Model Eye for each shooting mode. [Setup Procedure] (1) Enter the IOP Measure Setup Mode at Engineer Mode (2) There are 4 modes(SPC30, M30, SPC60, M60) and IOP offset settings.
  • Page 33 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ (8) Check the result after measurement of model eye. APPLANATION : APP 1st peak place of graph : APP 1st peak value of graph iii. : APP 1st peak size of graph : Pressure value on 1st peak...
  • Page 34 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P 4-1-6. Track Motor Setup [Purpose] Adjust the PWM duty of X, Y, Z motor and center positon for auto focus movement. [Setup Procedure] (1) Enter into Track Motor Setup Mode at Engineer Mode. (2) Select an PWM BASE of each direction, which decides base pulse width modulation of Auto Focus motor.
  • Page 35 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ B. PWM BASE(X-RG) : right size on X-axis. C. PWM BASE(Y-UP) : up side on Y-axis. D. PWM BASE(Y-DN) : down side on Y-axis. E. PWM BASE(Z-FR) : front side on Z-axis. F. PWM BASE(Z-RR) : rear side on Z-axis.
  • Page 36 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P (3) For manual mode, change the following items. MA – TARGET DIST(X) : x direction MA – TARGET DIST(Y) : y direction C. MA – TARGET DIST(ZF) : front side on z direction D. MA – TARGET DIST(ZR) : rear side on z direction (4) For Auto Focus mode, change the following items.
  • Page 37 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ Pachy Cam Gain : Pachy Camera Gain control PachLED : Pachy LED brightness control iii. S.G INFO : Pachy LED size and gray information Ant.Edge Shift : Anterior Edge Shift CCT Setup : CCT Calibration R Setup : R Calibration (3) Press the SG.INFO text to show the information of the pachy LED average...
  • Page 38 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P (5) Press the “Start” button to automatically measure the target. (6) Then it will start automatically to measure 5 times and display 5 results. (7) Finally, the result of the CCT calibration is output at the bottom.
  • Page 39 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ (15) To restore the value of setting, choose “Clear” on the screen. To save the current value of setting, choose “Save” on the screen. (16) 4-1-9. Touch Calibration [Purpose] The touch screen is calibrated for correct touch operation.
  • Page 40 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P as pen. When finish touching one cross shape, the next cross shapes are displayed. (4) When done, press “OK” button and the result values(calibrated position of X, Y) will be output. 4-1-10. Focus Align Test [Purpose] Test the focus LED, track motor setup and track dist setup.
  • Page 41 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ RUSP : Right Up Spot Point of X, Y RUSZ : Right Up Spot Size RUOF : Right Up Offset RDSP : Right Down Spot Point of X, Y RDSZ : Right Down Spot Size RDOF...
  • Page 42 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P (2) Adjust test operation count and motor’s duty through “+”, “-“, “++”, “- -“ buttons. (3) Touch the button to set the test area X-HEAD ON, OFF : left, right direction(Head) Y-HEAD ON, OFF : up, down direction(Head)
  • Page 43 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ (2) Press each item to test the item. (3) Select “Pass” or “Fail” button for each item. (4) Press the “Print” button to print the test results. (5) The “Reset” button initializes all items. 4-1-13. Log Mode [Purpose] To check logs written.
  • Page 44 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P Index: The sequence of logs written Cat: Category. This number shows which operation mode when the log written. iii. Time: Time with format YY/MM/DD hh:mm:ss. Func#: The function number. This number indicates specific internal function code.
  • Page 45 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ ④ IOP MSR SETUP : iop measure setting value ⑤ TRACK MOTOR SETUP : track motor setting value ⑥ TARGET DIST SETUP : target distance setting value ⑦ P MSR SETUP : pachy measure setting value ⑧...
  • Page 46 (2) Start DNW program, set your PC’s COM port number, 115200 Bps. (3) Connect PC to HNT-1/1P with serial cable. (4) Pressing the button of joystick, then turn on HNT-1/1P (5) DNW program will show the following screen. (6) Select Serial Port => Transmit menu, then File Dialog box pops up.

  • Page 47: Disassembly And Assembly Procedure

    Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ (8) After downloading, turn off and on the HNT-1/1P. Confirm the changed SW version on boot screen. 4-2. Disassembly and Assembly Procedure 4-2-1. Removing Head rest A’ssy (1) Remove the screws (2) and then separate Head rest A’ssy (1).
  • Page 48 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P 4-2-2. Removing the Optical System A’ssy (1) Remove the screws (2, 4ea) and then separate Optical System A’ssy (1).
  • Page 49 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ 4-2-2-1. Removing the Pachy Camera A’ssy. (1) Remove the screws &pin (2, 3) and then separate Pachy Camera A’ssy (1). 4-2-2-2. Removing the Solenoid A’ssy. (1) Remove the screws (6, 7) and then separate Piston Rubber (3).
  • Page 50 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P 4-2-3. Removing the XYZ and Moving base A’ssy. (1) Remove the screws (4, 4ea) and then separate Moving base frame (2). (2) Remove the screws &spring washer &nut (5,6,7) and then separate XYZ A’ssy (3).
  • Page 51 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ 4-2-4. Removing the XZ M A’ssy (1) Remove the screws (3) and then separate XZ M A’ssy (2).
  • Page 52 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P 4-2-5. Removing the Locking Module A’ssy. (1) Remove the screws (3) and then separate Locking Stopper A’ssy (1)
  • Page 53 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ (2) Remove the screws(8,4ea) and then separate Locking Module A’ssy (6) 4-2-6. Removing the XZ RAIL A’ssy...
  • Page 54 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P (1) Remove the screws (2) and then separate XZ RAIL A’ssy (1)
  • Page 55 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ 4-2-7. Removing the Connector Main Brkt A’ssy (1) Remove the screws (7) and then separate Connector Main Brkt (1) (2) Remove the screws (5) and then separate INLET (4) (3) Remove the pcb support & nut (8,9) and then separate RS232 (3)

  • Page 56: Troubleshooting

    -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P 5. Troubleshooting ) Troubles related with electricity  The power lamp does not light on.  The monitor is not bright enough. (2) Troubles related with LCD Monitor  Nothing is displayed.  The screen is moving.
  • Page 57 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ Phenomenon 1 : When Power is On, there is no action Phenomenon 2 : LCD monitor display nothing(But other functions works)
  • Page 58 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P Phenomenon 3 : Key does not work...
  • Page 59 Non-Contact Tonometer HNT-1/1P ------------------------------------------------------------------------------------------------ Phenomenon 4 : When printing out, there is some unclean side, especially end of paper Phenomenon 5 : When printing paper is not fed correctly Phenomenon 6 : Cannot see the eye fixation target...
  • Page 60 -------------------------------------------------------------------------------------------------- Non-Contact Tonometer HNT-1/1P Phenomenon 7 : Auto Focus movement is unstable or not working Phenomenon 8 : Chin rest movement is not working...

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