Summary of Contents for Mirae CHAROPS MRK-2000
- Page 1 SERVICE MANUAL AUTO REF/KERATOMETER MRK-2000 AUTO REFRACTOMETER MR-2000 Revision 1.1 www.charops.com...
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Page 2: Table Of Contents
CONTENTS 1. Structure of this machine · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 2. - Page 3 · · · 2 3 3.1.11 Removing the Base1 assembly · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·...
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Page 4: Structure Of This Machine
1. Structure of this machine - 1 -... -
Page 5: Operational Discription
2. Operational Discription 2.1 Measurement Principle 2.1.1 Measurement Principle of the Reflex system (1) Light beam from the light source is reflected from the examinee’s retina. (2) According to the refraction condition of the examinee’s eye, parallel light beam will be projected in case the examinee is emmetropia, and divergent light beam in case of myopia. -
Page 6: Measurement Principle Of The Keratometer System
About the function of the IOL Cornea and iris can be deformated in case of eyes with intraocular lens(IOL). Thus there can be measurement error due to the bad Light wave. Also, IOL has high transmitance of light than the crystalline lens of human. Thus if you measure the eyes with IOL in the same amount of light as human, the light reflected from retina is too strong. - Page 7 And there is the following relation between the radius of cornea (R), the refractive power of cornea (D), and the refration rate (n). Thus, strong and weak refractive powers of cornea (D) are calculated in regard to large and small radius of curvature (R) (figure 3). 1000 (n-1) The following 3 values can be selected D ＝...
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Page 8: Measurement Principle Of The Iol Observation
2.1.3 Measurement Principle of the IOL Observation (1) Principle of the IOL observation Give light to the fundus of the eye by lightening the infrared LED(spot light) used to measure the Auto Reflex and lightening the crystalline lens with the reflected light. And then confusing shape of the intermediate transparent body can be captured by TV camera. -
Page 9: Optical System And Operation Principle
2.2 Optical System and Operation Principle Terminology of Optical system 1 : patient’s eye 8 : light source (R) 2-1, -2 : LED for lightening cornea 9 : diffraction prism (R) 3 : ring unit of the keratometry 9-1 : diaphragm measuring relfex Diagram Illustrating the Operation principle 4-1 : protective glass 11 : relay lens measuring reflex... - Page 10 A p p e n d i x - Terminology (1) Foggy Method It is recommaned that the refractive power is measured when the examinee’s eye is in the hyperopia-state. But there can be some errors due to the interruption of the controllerbility if it is measured in the eye refraction system of internal optical target method (mechanic myopia).
- Page 11 (4) Cylinder Form There are three kind of the cylinder form. －: displaying form measured by minor meridian. Refractive power of the minor meridian is displayed as SPH and the axis AX. And Difference between the major and minor meridian is displayed as –CYL. ＋...
- Page 12 MRK-2000 classifies the data according to the signs (+, -) as follows. － : when the curvature of the peripheral area of cornea is greater than the curvature of the center of cornea. ＋ : when the curvature of the peripheral area of cornea is smaller than the curvature of the center of cornea.
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Page 13: Electrical System
2.3 Electrical system 2.3.1 Electrical wiring - 10 -... -
Page 14: Initialization And Error
2.3.2 Initialization and Error After connecting the power supply, MRK-2000 will initialize the system and perform the following functions. Completing all of these, it enters the K-R mode. Exact procedures are as follows. (1) Initialization of the Thermal Printer To initialize the Thermal Printer in the eyesight machine. (2) EEPROM To read the modifying value in need to perform a measurement from the EEPROM. - Page 15 (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 Figure 2-1 Diagram of the eye ball output by REF Measurement - 12 -...
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Page 16: Repair Standard
3. Repair Standard 3.1 Disassembly and Assembly Procedure - 14 -... -
Page 17: Checking And Control
3.2 Checking and Control 3.2.1 TEST MODE Turn on the power button of the MRK-2000 and wait a few minutes until the ‘Measurement Window’ is displayed. Press the following buttons in the following order. Check the ‘Beep’ sound. ◀ ◀ ▶... -
Page 18: How To Change Inc-R Into Unit
Setting the Shift amount of the KER-RAD, the KER-CYL, and the REF-CYL. Returning to the ‘Measurement Window’ from ‘TEST MODE’. 3.2.2 How to Change INC-R into Unit 0.01 REF measured value will be displayed as unit 0.12 or 0.25 in the normal ‘Measurement Window’. -
Page 19: Adjustment Of The Origin Of The Eye Fixation Target
3.2.3 Adjestment of the Origin of the Eye Fixation Target [Purpose] To locate the electric 0D to the optical 0D of the eye fixation target in the MRK-2000. [Procedure] Enter the TEST. Press the MODE button in order to select ‘REF-M’ and it enters ‘REF-MOTOR TEST’ as the following figure. -
Page 20: Checking The Ref-Data
3.2.4 Checking the REF-DATA [Purpose] To check the data of REF model eye stored in the MRK-2000. [Procedure] Enter the ‘TEST MODE’. Press the DISPLAY button to select the ‘R-DAT’. Then the following window will be displayed. IDX: DIOPTER 120: 228.40 229.80 227.80 -05.000 140: 261.20 261.90 259.10 -02.500 180: 282.80 281.70 282.30 +02.500 200: 309.80 307.10 309.30 +05.000... -
Page 21: Modifying The Ref-Measured Value
3.2.5 Modifying the REF-Measured Value [Purpose] To make the accuracy of REF measurement be in the tolerance after optical adjustment and the like. [Preparation] SPH model eye set(-20D ~ +20D) Model eye Stand [Procedure] Enter the ‘TEST MODE’. Set the stand with the model eye to input data in front of the MRK-3100. Press the ILLUM button to select the ‘REF’. - Page 22 left bottom of the window. Press the ILLUM button to save the data. The window returns to the ‘TEST MODE’. If the other button is pressed, it returns to the ‘TEST MODE’ without saving. (12) Change the INC-R into unit 0.01 (See 3.3.2) and measure each Diopter (-20D ~ +20D) in the SPH model eye.
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Page 23: Checking The Ker-Data
3.2.6 Checking the KER-DATA [Purpose] To check the data of KER model eye stored in the MRK-3100. [Procedure] Enter the ‘TEST MODE’. Press the DISPLAY button to select the ‘K-DAT’. Then the following window will be displayed. -7: 155.00 153.00 153.00 7.31 0: 168.00 168.00 168.00 7.92... -
Page 24: Modifying The Ker-Measured Value
3.2.7 Modifying the KER-Measured Value [Purpose] To make the accuracy of KER measurement be in the tolerance after optical adjustment and the like. [Preparation] KER model eye Set(R = 6.71, 7.32, 7.923, 8.77, 9.544) Model eye Stand [Procedure] Enter the ‘TEST MODE’. Set the stand with the model eye to input data in front of the MRK-3100. - Page 25 <Modification of the measured-value> If you press the ◀ button, the measured-value will be shown at the right bottom of the screen such as ‘DIFF-R = 1.23’. Incline the operation lever right/left and back/forth or turn it round so that the Mire Image is concentric with the Alignment Ring and consequently the above measured-value falls in ±1.0 range.
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Page 26: Important Notice To Service
3.2.8 Important Notice to Service Caution when handle the Measurement MAIN PCB UNIT Each part of the Main PCB Unit is surface mounted with minute pattern. When measuring the waveform, don’t connect the Probe of Oscilloscope to Check Pin directly with too much strength.
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Questions and answers
Cual es la tolerancia de control **** el fantoma
The control tolerance for the Mirae CHAROPS MRK-2000 is as follows:
- SPH (Sphere) Tolerance:
- ±0.35D at -20D and +20D
- ±0.25D at -15D, 0D, and +15D
- ±0.18D at -10D, -5D, +5D, and +10D
- ±0.16D at -5D
- CYL (Cylinder) Tolerance:
- -0.16D to 0D across all specified Diopters
The increment for measurement is 0.01D.
This answer is automatically generated