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Huvitz CRK-8800, Service Manual, Page: 58 / 58

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Huvitz CRK-8800 Service Manual Download 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 

 

Summary of Contents for CRK-8800

Page 1: ...Service Manual Auto Ref Keratometer CRK 8800 Ver 1 0...

Page 2: ...in the same environmental may expert an adverse influence on functioning of the medical equipment Non medical equipments not in compliance with the requirements of EN 60601 1 and EN 60601 1 2 should...

Page 3: ...ronmental Considerations 6 2 4 Safety Precaution 7 3 Product Outline 9 3 1 Main parts 9 3 2 Optical System 12 3 3 Electrical System 15 3 4 Mode Setting 22 3 5 Principles of Measurement 23 4 Repair Sta...

Page 4: ...it s peripheral corneal peripheral curvature measurement is possible as measuring the corneal curvature of examinee it is possible to know the information on the corneal peripheral curvature as well a...

Page 5: ...perator 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 e...

Page 6: ...uired to do the protective ground to the conductive section in the equipment of class I for the purpose of safety UL60601 1 CAN CSA C22 2 NO 601 1 MEDICAL EUIPMENT WITH RESPECT TO ELECTRIC SHOCK FIRE...

Page 7: ...any heaters are at the close distance to the machine Do not close the thermal ventilation outlet Where the humidity is high and there are problems to the heat dissipation and or ventilation Do not con...

Page 8: ...the range of 30 75 The machine should not be exposed to the place where water splashes drips or sprays Do not place containers containing fluids liquids or gases on top of any electrical equipment or...

Page 9: ...le connections If a cable does not connect easily be sure that the connector plug is appropriate for the receptacle socket If you cause any damage to a cable connector s or receptacle s let the damage...

Page 10: ...her or not the electric power is on 4 Display Monitor Monitor for measurement 5 Measurement Button Performing the measurement by pressing it after focusing 6 Operation Lever Adjusting the focus by mov...

Page 11: ...ion 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 5 Ch...

Page 12: ...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...

Page 13: ...Auto Ref Keratometer CRK 8800 12 3 2 Optical System...

Page 14: ...or 4 4 reflection mirror 5 polarizing beam splitter 6 reflection mirror 7 polarizing filter 8 collimation lens 9 diffuser 10 light source R 11 objective lens 12 insert lens 13 polarizing filter 14 ima...

Page 15: ...1 4 1 4 2 4 3 17 18 Projection system of the REF light source 10 9 8 7 6 5 4 2 4 1 1 Projection system of the REF measurement 1 4 1 4 2 5 11 13 14 15 16 Illumination system of the light source for Ret...

Page 16: ...CON11 CON7 CON4 CON5 CON6 CON9 AC 100 240 Dual Line Fuse Power switch DPST SMPS DC Output 5V 4A 5V 2A 12V 1 8A THERMAL PRINTER FRONT SWITCH LCD INVERTER ENCODER1 ENCODER2 COM1 COM2 RL_PI JOYSTIC VGA O...

Page 17: ...al block diagram AC 100 240 Power switch DPST SMPS DC Output 5V 4A 5V 2A 12V 1 8A Dual Line Fuse 3 3 2 Electrical wiring 3 3 2 1 Main Board CN9 CN23 CN18 CN17 MAIN BOARD 5V 12V 5V 12V 12V 5V 12V CN2 C...

Page 18: ...nnect CN8 Not used Not connect CN9 Peripheral Peripheral assy 51 CN12 Serial port COM1 Handshake Not connect CN13 Serial port COM2 Not connect CN17 KER CMOS camera connector KER CMOS B D J2 CN18 REF C...

Page 19: ...tometer CRK 8800 18 3 3 2 3 Base IO Interface Board CON3 CON12 CON10 CON17 CON1 CON13 CON2 CON14 CON16 CON11 CON4 CON5 CON6 CON9 BASE INTERFACE BOARD 5V 4A 5V 2A 12V 1 8A 5V 2A 12V 1 8A 5V 12V CON15 C...

Page 20: ...1 Main B D CN11 CN6 CON 5 IO Board interface connector 2 Main B D CN12 CN7 CON 6 DC Power input connector SMPS CON 7 RGB out port Ext D_SUB connector CON 9 DC Power output connector Main B D CN48 CON...

Page 21: ...Motor board interface connector Main assy CN2 B JP9 Motor board power Main assy CN11 C JP7 DC motor DC motor assy D JP3 Hi diopter motor diopter motor E JP2 REF PI chart lamp PI assy J2 chart lamp ass...

Page 22: ...MPU Main Controller Unit B U33 FPGA AX250 FG484 D1L9C FPGA Logic Array C U2 SDRAM K4S641632H TC75 Main Data memory D U25 U28 SDRAM K4S641632H TC75 Video frame buffer E BT1 RTC Battery Li Ion battery B...

Page 23: ...e it permanently After downloading CRK 8800 is restarted automatically When it turns off CRK 8800 will return to previous OS program before downloading KEY_5 S W Upgrade Mode Download OS program into...

Page 24: ...he examinee s eye is emmetropia hyperopia or emmetropia the reflected light from the retina is parallel to the optic axis of the eye diverge or converge respectively 3 The light beam reflected from th...

Page 25: ...Auto Ref Keratometer CRK 8800 24 Objective Lens Image Lens MLA Micro Lens Array TV Camera...

Page 26: ...nor axis 2b and then the rotational angle axis on the minor meridian Furthermore there is a correlation between the radius of cornea R the height of the projected ring image H which can be obtained fr...

Page 27: ...h the crystalline lens and the iris If it is captured by TV camera any turbid part of the transparent vitreous humor lens and cornea can be observed 3 5 3 2 Usage of Retro Illumination observation The...

Page 28: ...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 When you press any key in the screen of Engineer...

Page 29: ...ata 3 KER TEST Setup KER model eyes 4 KER SETUP DATA Display KER setup data 5 STEP MOTOR TEST Setup initial position of Eye Fixation Target 6 AUTO START SETUP Setup auto start condition and focusing i...

Page 30: ...ld change the unit into 0 01 as the following steps procedure 1 Enter the VALUE SHIFT SETUP 2 Select REF VALUE STEP item by pressing UP or DOWN key 3 Select the unit as 0 01 between 0 01 0 12 and 0 25...

Page 31: ...a connected to an external TV monitor at the position of eye in front of objective lens 4 Press 5 STEP or 5 STEP to move the REF Motor to make the chart of the eye fixation target to be shown clear on...

Page 32: ...15D 10D 5D 2 5D 0D 2 5D 5D HIGH diopters include 6 setup data of model eyes 0D 2 5D 5D 10D 15D 20D and there is totally 14 setup datum Procedure 1 Enter REF SETUP DATA in Engineer Setup Mode 2 GRID_W...

Page 33: ...eye of which setup data is to be measured at the position of chin rest You have to start this setup with the model eye of 0D 3 Press the joystick button to start and press LEFT or RIGHT key to choose...

Page 34: ...s from 2 7 for in the range of model eyes 5 0D 2 5D 0 0D 2 5D 5 0D 10 0D 15 0D 20 0D 8 Press the PRINT button to change the current diopter mode to HIGH diopter then HIGH DIOPT will be displayed on th...

Page 35: ...e REF setup data of it and it two neighbor model eyes should be measured again 3 If the number of model eye whose value of CYL does not meet the tolerance specification is less than three it is regard...

Page 36: ...ETUP DATA in Engineer Setup Mode 2 Following items describe the setup ring s properties R Major Diameter C Minor Major Ratio A Axis D Diameter on Horizontal axis Focus Length K Focus Setup Ratio H Dia...

Page 37: ...and with the model eye of which setup data is to be measured at the position of chin rest 3 By adjusting the joystick make Mire rings on the screen be concentric with the Alignment ring and be mostly...

Page 38: ...By adjusting the joystick make Mire rings on the screen be concentric with the Alignment ring and be mostly focused between forward and backward direction 10 Press the joystick button then the measur...

Page 39: ...etween R1 and R2 i e R1 R2 0 05mm Corneal equivalent refractive index 1 3375 K E KER RAD KEY CYL 4 1 8 Adjusting Auto Start Function STD 15D 6 71 7D 7 29 0D 7 93 7D 8 76 15D 9 51 R 7 8 7 80 Average R1...

Page 40: ...values for AREA and GRAY will be appeared at the center side of the display Write down these numbers on a blank paper 5 Enter into AUTO START SETUP 6 Select the values of parameter for auto start fun...

Page 41: ...l 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 7 Choose CRK 8800_test bin file then p...

Page 42: ...Top cover and top cover side 7 8 Remove the side Bolt cap 13 the screws 14 the screws 12 and then separate left cover 4 and right cover 3 Remove the Bolt cap 17 the screws 18 and then separate the Re...

Page 43: ...rews 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 2 Point for Assembly Assembly is the reverse p...

Page 44: ...nd 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 2 Point for Assembly Assembly is the reverse procedure of disassemb...

Page 45: ...ft 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 10 2 Point for Assembly Assembly i...

Page 46: ...n separate the User Lock Assy 6 Remove the screws 3 and then remove the Joystick Assy 5 the Belt 4 Remove the screws 11 and then remove the PD Encoder Film 8 the PD Sensor Plate 10 Remove the Packing...

Page 47: ...e the Packing Lock Shaft 2 Remove the screws 12 and then separate the Connector Main Frame 13 Remove the screws 7 the nuts 4 and then remove the Rail Assy 8 Separate the Power Switch 16 the Base Upper...

Page 48: ...pot is not displayed The anterior part of eye is not displayed 3 Troubles related with measurement NO TARGET is displayed OVER SPH is displayed OVER CYL is displayed ERROR is displayed KER measurement...

Page 49: ...stered well 2 Check the voltage 5V of connector by using DMM Please refer to 3 3 section of Service Manual for Electrical Wiring Voltage 5V OK Take off the head Top cover Replace Main Board In this ca...

Page 50: ...LCD Monitor 1 Main Board to LCD Moniter 2 Interface Board to LCD Inverter Board Please refer to the Service Manual for Electrical Wiring Does all connections are OK Yes Check voltage of the cable fro...

Page 51: ...he 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 Does the level goes to L 0V Yes Replace Main Board No C...

Page 52: ...ing result is OK Yes Remove printer cover from the body front cover Replace the thermal printer module through hole at right side of body front cover Unconnect the cable from IO Board to the thermal p...

Page 53: ...of TEST MODEL EYE is very different from the original value when the focusing bright spot is somewhat out focused Enter into REF TEST Enter into TEST MODE Enter into CCD mode by pressing CCD button t...

Page 54: ...to the eyesight of examinee Foggy method is the method that the size of the target is modified to be greater than the eyesight of the examinee by 1D 2D in order to reduce the error caused by this acco...

Page 55: ...e in User Setup Mode VD 0 0mm hard contact lens VD 12 0mm lens of glasses oriental people VD 13 5mm lens of glasses western people VD 15 0mm lens of glasses western people 3 Cylinder Form There are th...

Page 56: ...e 4 Axis Axis is expressed counterclockwise from the ear side of the left eye as the origin shown in the figure below 5 Pupil Distance PD Pupillary distance PD is the distance between the centers of t...

Page 57: ...of the SETUP MODE See the following table and diagram for further information Classification of Data NORMAL MYOPIA HYPER OPIA ASTI GMA TISM NORMAL 0 5 S 0 5 0 5 C 0 0 MYOPIA S 0 5 0 5 C 0 0 SIMPLE MYO...

Page 58: ...MAL 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...

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