Huvitz CRK-8800 Service Manual
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Huvitz CRK-8800 Service Manual

Auto ref/keratometer
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Service Manual
Auto Ref/Keratometer CRK-8800
Ver 1.0

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Summary of Contents for Huvitz CRK-8800

  • Page 1 Service Manual Auto Ref/Keratometer CRK-8800 Ver 1.0...
  • Page 2 The information in this publication has been carefully checked and is believed to be entirely accurate at the time of publication. S H A N G H A I HUVITZ assumes no responsibility, however, for possible errors or omissions, or for any consequences resulting from the use of the information contained herein.

  • Page 3: Table Of Contents

    ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 2 Contents 1. Introduction ................3 2. Safety Information ..............4 Overview ................ 4 Safety Symbol ..............5 Environmental Considerations ........6 Safety Precaution ............7 3. Product Outline ..............9 Main parts ..............9 3-2 Optical System .............. 12 3-3 Electrical System ............

  • Page 4: Introduction

    ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 3 1. Introduction Auto Ref/Keratometer CRK-8800 is the equipment to provide the information of Spherical, Cylindrical and Axis while measuring the refraction of examinee’s eyes. Auto Ref/Keratometer C RK-8800 is the equipment that can measure the corneal curvature of examinee. In addition, it can measure PD (=distance in between pupils) and pupil size.

  • Page 5: Safety Information

    ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 4 2. Safety Information 2-1 Overview 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: Safety Symbol

    ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 5 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: Environmental Considerations

    ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 6 2-3 Environmental Considerations Please avoid the environment below for the operation and storage of the equipment Where equipment Where the machine can exposed to water vapor. exposed chemical or flammable Don’t operate the equipment substances.

  • Page 8: Safety Precaution

    The equipment must be operated only by, or under direct supervision of properly trained and qualified person/s. Modifications of this equipment may only be carried out by SHANGHAI HUVITZ’s service technicians or other authorized persons. Customer maintenance of this equipment may only be performed as stated in the User’s Manual and Service Manual.
  • Page 9 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 8 The equipment may only be used together with accessories supplied by SHANGHAI HUVITZ’s. If the customer makes use of other accessories, use them only if there are usability under technical safety aspects has been proved and confirmed by SHANGHAI HUVITZ or the manufacturer of the accessory.

  • Page 10: Product Outline

    ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 9 3. Product Outline 3-1 Main parts 1. Height Adjustment Mark: Adjusts the eyes’ height of examinees 2. Operation Buttons: Selecting of functions ٍ 3 . Operation Lamp : Indicates whether or not the electric power is on 4.
  • Page 11 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 10 1. Forehead Rest: Preventing the vibration by fixing the forehead 2. Measuring Object Lens: Measuring the image imaging on the retina of eyes. 3. Chin Rest: Preventing the vibration by fixing the chin 4. Power Switch: Switch for power on/off...
  • Page 12 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 11 1. Power Supply Socket: A socket connecting to exterior power plug 2. Serial Interface Connector: A terminal connecting to the exterior equipment 3. Clamping Bolt: Fixing the system stage NOTE As connecting to exterior monitor, noises can appear on the monitor owing to the...

  • Page 13: Optical System

    ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 12 3-2 Optical System...
  • Page 14 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 13 3-2-1.List of Optical Components (1) : patient’s eye (2-1, -2) : LED for lightening cornea (3-1, -2, -3) : ring unit of the keratometry (4-1) : protective glass (4-2): half mirror (4-3) : half mirror...
  • Page 15 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 14 3-2-2.Light Paths of the System Ａ : External illumination ( 2-1 , 2- 2 Ｂ : Corneal observation system ( 4-1 4 - 2 Ｃ : Ker meas ure men t s ys te m...

  • Page 16: Electrical System

    ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 15 3-3 Electrical System 3-3-1.Electrical construction diagram 3-3-1-1.System functional block diagram...
  • Page 17 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 16 3-3-1-2.Power input electrical block diagram DC Output +5V, 4A +5V, 2A +12V, 1.8A Dual Line Fuse Power switch AC 100-240~ (DPST) SMPS 3-3-2.Electrical wiring 3-3-2-1.Main Board CN12 CN11 CN20 CN13 MAIN BOARD CN17 CN21 +12V...
  • Page 18 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 17 3-3-2-2.Description of wire harness connection of main board Connect Description Target connector Motor board interface connector Motor Board JP1 Mire ring LED connector Mire ring B/D CON1 External illumination EXT ILM assy connector Not used...
  • Page 19 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 18 3-3-2-3.Base IO Interface Board CON12 CON3 CON9 +5V, 2A CON8 CON10 CON17 +12V, 1.8A CON1 CON13 CON18 CON4 +12V CON2 CON14 CON16 CON6 CON15 CON11 +5V, 4A +5V, 2A CON7 +12V, 1.8A CON5 BASE INTERFACE BOARD...
  • Page 20 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 19 3-3-2-4.Description of wire harness connection of IO Board Connect No. Description Target connector CON 1 Serial port (COM1) : Handshake Ext. D-SUB connector CON 2 Serial port (COM2) Ext. D-SUB connector CON 3 Thermal printer connector...
  • Page 21 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 20 3-3-2-5.Motor interface board JP10 MOTER INTERFACE BOARD 3-3-2-6.Description of wire harness connection of Motor interface Board Part name / Description Target connector Motor board interface connector Main assy CN2 Motor board power Main assy CN11...
  • Page 22 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 21 3-3-3.Layout diagrams for PCB 3-3-3-1.Picture of Main Board 3-3-3-2.Description of wire harness connection of Main Board Ref No. Part name / Description Target connector A U1 CPU S3C241AI MPU (Main Controller Unit) B U33 FPGA AX250 FG484 D1L9C...

  • Page 23: Mode Setting

    [S/W Upgrade Mode] Download OS program into RAM via serial port (ex. COM), but not store it permanently. After downloading, KEY_1 CRK-8800 is restarted automatically. When it turns off, CRK-8800 will return to previous OS program before downloading. [S/W Upgrade Mode] Download OS program into ROM via serial port (ex.

  • Page 24: Principles Of Measurement

    ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 23 Principles of Measurement 3-5-1. Measurement principle of refractometry (1) Light beam from the source is incident on the examinee’s eye and reflected from it’s retina as in the Figure below. (2) According to the refraction condition of the examinee’s eye, that is, if the examinee’s eye is emmetropia, hyperopia or emmetropia, the reflected light from...
  • Page 25 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 24 Image Lens Objective Lens MLA(Micro Lens Array) TV Camera...
  • Page 26 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 25 3-5-2. Measurement principle of keratometry When the ring light source of the keratometry is projected on to the cornea, it is reflected as a circle or an ellipse in the case of the eye with corneal astigmatism. The size and the shape of reflected light are different according to the radius of curvature of the cornea because the cornea is not a sphere.
  • Page 27 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 26 Lens for measuring Ring type light source for measuring (Mire Ring) TV Camera 3-5-3. The principle of Retro-Illumination observation 3-5-3-1. Principle of retro-illumination observation The incident lights of the infrared LED (spot light) onto the fundus of the eye are retro- scattered from it.

  • Page 28: Repair Standard

    4-1.Checking and Control 4-1-1. Engineer Setup Mode Turn on CRK-8800 and wait several seconds until the measure screen in REF mode is displayed. Press the keys in following orders. PRT -> IOL -> IOL -> FUNC -> FUNC -> FUNC -> VD -> VD -> FUNC If the current measure mode is not REF mode or there is a measure result, you could not enter the engineer setup mode.
  • Page 29 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 28 [D] UP (KEY_4) Select the previous menu item. [E] DOWN (KEY_5) Select the next menu item. [F] ENTER (KEY_6) Start the selected Engineering setup mode. - Engineering setup menus are the followings. (1) REF TEST - Setup REF model eyes.
  • Page 30 (4) Exit and return to Measure screen. (5) SPH and CYL value will be displayed as 0.01 units. NOTE The unit of 0.01 cannot save into system configuration. After CRK-8800 turned off and on, the unit will change into 0.12 automatically.
  • Page 31 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 30 4-1-3.How to adjust Origin of Eye Fixation Target [purpose] To find out the position of REF Motor to move lens along the optic axis at which the fixation target is projected on the eye or CCD camera from infinity distance.
  • Page 32 4-1-4.How to check REF Setup Data. [Purpose] To check setup data of REF model eye currently stored in CRK-8800. CRK-8800 has two channels of LOW and HIGH diopters for REF model eye setup. LOW diopters include 8 setup data of model eyes (-20D, -15D, -10D, -5D, -2.5D, 0D, +2.5D, +5D), HIGH diopters include 6 setup data of model eyes (0D, +2.5D, +5D,...
  • Page 33 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 32 4-1-5.Modifying the REF-Measured Value [Propose] To make the accuracy of REF data is in the allowed measurement tolerance after the optical re-adjustment or the like… [Preparation] (1) SPH model eye set (-20D ~ +20D) Model eye stand [Procedure] (1) Enter the REF TEST in Engineering Setup Mode.
  • Page 34 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 33 (6) Press the joystick button to setup, and then the refraction measure for the model eye will be performed 10 times automatically. If there is no error, the setup diopter will be displayed on the side of screen.
  • Page 35 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 34 (1) If any measurement value of “CYL” or “MsrSPH – STD” of model eye of which diopter value is in the range from –5D to +5D is not within the tolerance, the procedure of REF setup process should be performed again.
  • Page 36 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 35 [Purpose] To check setup data of KER model eye currently stored in CRK-8800. [Procedure] (1) Enter KER SETUP DATA in Engineer Setup Mode. (2) Following items describe the setup ring’s properties. : Major Diameter : Minor / Major Ratio : Axis : Diameter on Horizontal axis –...
  • Page 37 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 36 [Purpose] To make the accuracy of KER data is in the allowed measurement tolerance after the optical re-adjustment or the like… [Preparation] (1) KER model eyes (R= 6.71, 7.29, 7.93, 8.76, 9.51) Model eye stand...
  • Page 38 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 37 (7) Adjust the joystick to make the head of the instrument to move forward by 0.5 mm, and the joystick button to let the measurement be done again. Perform each measurement up to 7 times after moving the head forward in the step of 0.5 mm.
  • Page 39 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 38 The difference between R1 and R2, i.e., R1–R2 : ±0.05mm Corneal equivalent refractive index: 1.3375 -15D +15D R=7.8 Average 6.71 7.29 7.93 8.76 9.51 7.80 AR-STD R1-R2 KER-RAD: KEY-CYL: 4-1-8.Adjusting Auto Start Function...
  • Page 40 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 39 (1) Enter into KER TEST in Engineering Setup. (2) Set the stand with the model eye for KER setup. (3) Incline the joystick lever toward the model eye until a bright dot appears near the Inner Alignment Ring.

  • Page 41: 4-2.Disassembly And Assembly Procedure

    (2) Start DNW program, set your PC’s COM port number, 115200 Bps. (3) Connect PC to CRK-8800 with serial cable. (4) Pressing the 5th key, then turn on CRK-8800 (5) DNW program will show the following screen. (6) Select Serial Port => Transmit menu, then File Dialog box pops up.
  • Page 42 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 41 4-2-1.Removing the Cover & Head rest Assy (1) Removal Method Remove the screws (15) of the Main body (1) and then separate the Head rest Assy (5) Separate Top cover and top cover side (7,8)
  • Page 43 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 42 (1) Removal Method Remove the screws (6) and then remove the bracket (3,4) from the optical system (2). Remove the socket set screws (5) and then remove the optical system (2) from the Main body (1).
  • Page 44 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 43 (1) Removal Method Remove the screws (9, 10) and then remove the Main Board (6), the Main Board Stand (5) and the Airtight Rubber (4). Remove the screws (7, 8) and then remove the Cover (2,3).
  • Page 45 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 44 (1) Removal Method Remove the screws (2) and then separate the center side, left cover and right cover(4,5,7) Remove the screws (9), the nut (6) and then separate the Moving base (3) Remove the screws (11) and then separate the PD Encoder & PI sensor Assy...
  • Page 46 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 45 (1) Removal Method Remove the screws (12) and then separate the Y-Pole Assy (13). Remove the screws (7) and then separate the User Lock Assy (6). Remove the screws (3) and then remove the Joystick Assy (5), the Belt (4).

  • Page 47: Troubleshooting

    ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 46 Removal Method Remove the screws and then separate the Packing Lock Knob (1). Remove the screws (10) and then separate the Foot (9), the F-Base Bottom Cover (11). Separate the Packing Lock Shaft (2). Remove the screws (12) and then separate the Connector Main Frame (13).
  • Page 48 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 47 The monitor is not bright enough. (2) Troubles related with LCD Monitor Nothing is displayed. The screen is moving. The reference ring is not displayed The aiming spot is not displayed The anterior part of eye is not displayed (3) Troubles related with measurement NO TARGET is displayed.
  • Page 49 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 48 Phenomenon1: When Power is ON, there is no action Check whether power cable is inserted well check Fuse in the bottom side Take off the head Top cover 1. Check whether the cable from SMPS to Main Board is instered well 2.
  • Page 50 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 49 Phenomenon2: LCD monitor display nothing(But ohter functions works) Check whether Brightness Knob is turned well Take off the head Top cover Check the cables related to LCD Monitor 1. Main Board to LCD Moniter 2. Interface Board to LCD Inverter Board...
  • Page 51 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 50 Phenomenon3: Key or JoySticik does not work Take off the cover Check the cable of mainboard with Key or Joystick ((When pressing the button, check whether the voltage goes to 'L' level. Default is 'H' level))
  • Page 52 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 51 Phenomenon4: When printing out, there is some unclean side, especially end of paper Phenomenon5: When printing paper is not fed correctly Take off the head front cover Unconnect the cable from IO Board to the...
  • Page 53 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 52 Phenomenon6: Cannot see the eye fixation target Take off the head front cover Check whether LED is out Is LED out? Change the Optical Head with Motor Board Replace LED Phenomenon7: The results of Refractometry of TEST MODEL EYE is very different...

  • Page 54: Technical Materials

    ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 53 6. Technical Materials (1) Fogging Method It is recommended that the refractive power of eye is measured when it is in the hyperopia-state. There happens some measurement error called mechanic myopia due to the accommodation of eye when it is measured by locating the internal eye-fixing target to the position corresponding to the eyesight of examinee.
  • Page 55 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 54 (2) Vertex Distance (VD) Vertex Distance is the distance between the backward vertex of the correcting lens (eye side) and the vertex of cornea. VD influences the refraction power of eyesight correction lens. If VD is increased, refraction power of correction lens is needed to be smaller, whereas, if VD is decreased, it is needed to be larger than that of the standard VD as the following equation.
  • Page 56 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 55 MIX : “-“ sign will be attached in the case of the myopic astigmatism whereas, “+” sign in the case of the hyperoptic astigmatism. The above-mentioned option can be chose in ‘User Setup Mode’ (4) Axis Axis is expressed counterclockwise from the ear side of the left eye as the origin shown in the figure below.
  • Page 57 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 56 (6) Eyeball Diagram representing refraction power It is possible to print the refraction state diagram regarding the result of the REF measurement to the internal printer. This function will be performed when ‘PRINT=EYE : ON’ in the Page 3/4 of the SETUP MODE.
  • Page 58 ----------------------------------------------------------------------------------------------- Auto Ref/Keratometer CRK-8800 57 (a) EMMETROPIA/NORMAL (e) MIXED ASTIGMATISM (b) MYOPIA/NEAR SIGHTEDNESS (f) HYPEROPIA / FAR SIGHTEDNESS (c) SIMPLE MYOPIC ASTIGMATISM (g) SIMPLE HYPEROPIC ASTIGMATISM (d) COMPOUND MYOPIC ASTIGMATISM (h) COMPOUND HYPEROPIC ASTIGMATISM Diagram of the eye ball output by REF Measurement...

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