Essilor AKR 550 Maintenance Manual
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Essilor AKR 550 Maintenance Manual

Essilor AKR 550 Maintenance Manual

Auto kerato refractometer
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Auto kerato refractometer
Maintenance Manual

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Summary of Contents for Essilor AKR 550

  • Page 1 Auto kerato refractometer Maintenance Manual...

  • Page 2: Table Of Contents

    Contents External View ......................... 2 Internal Structural Diagram ..................3 Measurement Principle ....................4 Block Diagram ........................ 5 Connection Diagram ...................... 6 Wiring Diagram ......................8 Troubleshooting......................11 Cleaning of Eye Lens, Measurement Window Filter and Model Eye ASSY ... 33 Functional Check ......................

  • Page 3: External View

    1 External View Name Name LCD monitor Power plug connector Touch-sensitive panel Rating plate Printer cover Chinrest Base Body cover Rubber leg Face panel Main unit slide lock knob Headrest Measurement start switch Head cover Joystick Printer cover button Slide base cover Headrest rubber Power switch Chinrest knob...

  • Page 4: Internal Structural Diagram

    2 Internal Structural Diagram Name Name Optical unit Joystick Control board Slide base cover Optical cover Base LCD monitor PD meter Touch sensor board Vertical unit LCD relay board XZ unit Printer Power unit Printer control board Bottom plate Measurement window ring Rubber leg Main unit BKT Chinrest...

  • Page 5: Measurement Principle

    3 Measurement Principle 1) Measurement of eye refraction A measurement pattern for measurement of eye refraction is projected to an eyeground to be measured. The projected pattern changes its size depending on the eye’s refractive power. The reflect light of this eyeground image is led to the sensor through the measurement system. The detected data is stored in the frame memory and conducted pattern analysis by image processing to calculate values of S, C and A.

  • Page 6: Block Diagram

    4 Block Diagram...

  • Page 7: Connection Diagram

    5 Connection Diagram...

  • Page 9: Wiring Diagram

    6 Wiring Diagram Front View Joystick Printer Side View Optical Unit ASSY Printer Control Board Power Switch...
  • Page 10 Rear View Face Cover Measurement Window Ring Bottom View Peripheral Relay Harness SWPS Output Harness Switching Power Supply PD ASSY SWPS Input Harness...
  • Page 11 Plane View Main Control Board LCD Relay Harness Back Side of LCD LCD Relay Board Operation Switch Harness LCD Backlight Harness LCD Signal Harness Operation Switch Board...

  • Page 12: Troubleshooting

    7 Troubleshooting General description of boards Error message ‘RETRY’ appears Error message ‘EEPROM fault’ appears Error message ‘Target (Focus) Motor fault’ appears Error message ‘Printer Overheated’ appears Error message ‘Printer cover opened’ appears Error message ‘Paper empty’ appears Error message ‘Sub system time out’ appears Error message ‘Sub system data err’...
  • Page 13 7-1 General description of boards This product is composed mainly with the peripheral boards such as the boards and the various types of sensors etc. as shown below. Main functions of each board are described below. Control board : Control of CMOS camera, control of LCD, control of Motor, Control of LED, control of each sensor, control of external communication, image processing, calculation of measurement value...
  • Page 14 7-2 Error message ‘RETRY’ appears Main causes when error message ‘RETRY’ appears: ・ When the image is not caught accurately because of examinee’s condition (blinking or not looking at target etc.) ・ Alignment is not achieved correctly ・ Failure of control board ・...
  • Page 15 7-3 Error message ‘EEPROM fault’ appears Main causes when error message ‘EEPROM fault’ appears: ・ Disconnection of harnesses ・ Failure of control board ・ Failure of EEPROM board ‘EEPROM fault’ is displayed. Is conduction of EEPROM harness normal? Perform ‘Reset of setting’ Replace the EEPROM harness.
  • Page 16 7-4 Error message ‘Target (Focus) Motor fault’ appears. Main causes when error message ‘Target (Focus) Motor fault’ appears: ・ Failure of control board ・ Failure of optical unit ‘Target (Focus) Motor fault’ is displayed. Replace the harness connected to CN703 with the one connected to CN704.
  • Page 17 7-5 Error message ‘Printer Overheated’ appears Main causes when error message ‘Printer Overheated’ appears: ・ Printer head is hot ・ Failure of printer unit ・ Failure of printer control board ‘Printer Overheated’ is displayed. Wait until the printer head is cooled down. Is ‘Printer Overheated’...
  • Page 18 7-6 Error message ‘Printer cover opened’ appears Main causes when error message ‘Printer cover opened’ appears: ・Printer cover is opened. ・Failure of printer unit ・Failure of printer control board ‘Printer cover opened’ is displayed. Set the cover correctly. Is the printer cover set correctly? Replace the printer control board.
  • Page 19 7-7 Error message ‘Paper empty’ appears Main causes when error message ‘Paper empty’ appears: ・No printer papers in printer ・Failure of printer unit ・Failure of printer control board ‘Paper empty’ is displayed. Set the papers. Are there any papers in the printer? Are printer papers set properly? Set the printer papers properly.
  • Page 20 7-8 Error message ‘Sub system time out’ appears. Main causes when error message ‘Sub system time out’ appears: ・ Disconnection of printer harness ・ Failure of printer control board ・ Failure of control board ‘Sub system time out’ is displayed. Is conduction of the Replace the printer harness.
  • Page 21 7-9 Error message ‘Sub system data err’ appears Main causes when error message ‘Printer cutter fault’ appears: ・ Disconnection of printer harness ・ Failure of printer control board ・ Failure of control board ‘Sub system data err’ is displayed. Is conduction of the Replace the printer harness.
  • Page 22 7-10 Nothing is displayed on screen when turning on Main causes when nothing is displayed on screen when turning on: ・ No power output ・ Disconnection of a harness ・ Failure of LCD unit ・ Failure of LCD relay board ・...
  • Page 23 7-11 No responses when pressing measurement start switch Main causes in case of no responses when pressing measurement start switch: ・ Failure of measurement start switch ・ Failure of control board No response when pressing the measurement start switch. Is conduction between Pin 7 and Pin 8 of Replace the measurement CN 403 of the control board normal when start switch.
  • Page 24 7-12 No responses when pressing operation switch Main causes in case of no responses when pressing operation switch: ・ When wearing gloves ・ Failure of operation switch ・ Failure of LCD relay board ・ Failure of operation switch board or control board No response when pressing the operation switches.
  • Page 25 7-13 Measurement result is not printed out/ printout is not normal Main causes when measurement result is not printed out/ printout is not normal: ・ Printer setting is OFF ・ Failure of printer ・ Failure of printer control board ・ Failure of control board No print out/ printout is not normal.
  • Page 26 7-14 Ref measurement LED does not light up Main causes when ref measurement LED does not light up: ・ Failure of control board ・ Failure of optical unit Ref LED does not light up. Are the optical unit and control Connect the harness correctly.
  • Page 27 7-15 Cannot see target Main causes when you cannot see target ・ When power saving mode is ON ・ Failure of control board ・ Failure of optical unit You cannot see the target. Set the power saving mode as OFF. Is the power saving mode ON? Are the optical unit and control Connect the harness correctly.
  • Page 28 7-16 Infrared illumination LED does not light up Main causes when infrared illumination LED does not light up: ・ Failure of control board ・ Failure of optical unit Infrared illumination LED does not light up. Are the optical unit and control Connect the harness correctly.
  • Page 29 7-17 Light source for Kerato/ illumination does not light up Main causes when light source for Kerato/ illumination does not light up: ・ Failure of optical unit ・ Failure of control board Light source for Kerato/ illumination does not light up. Are the optical unit and control Connect the harness correctly.
  • Page 30 7-18 Cannot communicate with PC or phoropter Main causes when it cannot communicate with PC or phoropter ・ Settings of communication software is different ・ Used communication cable is not correct ・ Failure of control board Cannot communicate with PC or phoropter. Correct the setting.
  • Page 31 7-19 Cannot measure PD (cannot measure PD correctly) Main causes when it cannot measure PD (cannot measure PD correctly: ・ Failure of PD meter ASSY ・ Failure of control board Cannot measure PD. Check the measurement start switch. Is the measurement start switch normal? (Is the refractivity measurable?) 【Refer to 7-11.】...
  • Page 32 7-20 No power outlet 1. Check fuse (Note) Make sure to unplug the power plug before starting this process. Take out the fuse from the fuse holder and check the conduction. If no conduction is confirmed, replace it with the specified fuse. 2.
  • Page 33 7-21 Abnormal measurement value of model eye ASSY Main causes when measurement value of model eye ASSY is abnormal. ・ Surface of the model eye ASSY is stained. ・ Eye lens is stained. ・ Setting of VD is not 12. ・...

  • Page 34: Cleaning Of Eye Lens, Measurement Window Filter And Model Eye Assy

    8 Cleaning of Eye Lens, Measurement Window Filter and Model Eye ASSY Clean the eye lens and the model eye ASSY as shown below because if they have stains of fingerprints or dirt etc., they affect on the measurement accuracy. 1) Saturate K-dry cleaning material or soft cloth with lens cleaner (absolute alcohol).

  • Page 35: Functional Check

    9 Functional Check Verification of measurement accuracy It is very important to verify measurement accuracy with the model eye ASSY when evaluating the accuracy of the measurement values of this product. Verify the accuracy by using the model eye ASSY periodically. 1) Before setting the model eye ASSY, make sure it has no scratches or stains on its surface.

  • Page 36: Maintenance Mode

    10 Maintenance Mode The maintenance mode has the functions needed for maintenance such as evaluating the measurement image, the adjustment data and hardware, shifting the SPH data, correcting the optical adjustment data of the product, and printing out etc. 10-1 Start-up of maintenance mode Turn on the power by pressing the measurement start switch.
  • Page 37 10-2 Functions of each menu item on maintenance mode 1. Arrange Mode When choosing this menu item, the normal menu screen will be appeared. Refer to the operation manual about contents of each menu item. 2. Freeze Image When choosing this menu item after measurement, the measurement evaluation screen (image screen) as shown on the right appears.
  • Page 38 4. Shift Target When choosing this menu item, the screen as shown on the right appears. The position of the fixation target will be shifted arbitrarily in the range of +1.0 to -1.0D (0.1STEP). Descriptions of each switch are as shown below. Shift to + side by 0.1D.
  • Page 39 1) TARGET LED Check from the measurement window if the target is lighted up. The target blinks 3 times. 2) REF MEASUREMENT LED Check with the monitor if the ref measurement light is lighted up, and the camera for ref light-receiving is working normally.
  • Page 40 7. Calibration 7.1 Calibration This item is to readjust the device by using the model eye for calibration as the maintenance tool. When starting this menu item, you need the mode eye for calibration other than the accessory model eye (the model eye ASSY). Conduct calibration only to the model eye which has problems with the measurement value (capability).
  • Page 41 7.2 REF Calibration 1） Move the cursor to the menu item to be adjusted (refer to the descriptions below) by pressing switch and press switch. The model eyes that correspond to the each item of ‘MODEL EYE A-F’ are as shown below.
  • Page 42 2) Make sure that the cursor is positioned at the ‘DPT_A’. (Usually the cursor is at this position but if it is not, move the cursor to the ‘DPT_A’ with ‘DOWN’ switch.) 3) Input the indicated value of the model eye in ‘DPT_A’ by pressing ‘+’ or ‘－’. (Input ‘-0.100’...
  • Page 43 7.3 KRT Calibration 1) Press switch on the ‘REF CALIBRATION’ screen. 2) The screen is switched to the selection screen of ‘KRT CALIBRATION’. Move the cursor to the model eye to be adjusted (refer to the descriptions below) with switch and press switch.
  • Page 44 2) Make sure that the cursor is positioned at ‘KDP_A’. (The cursor is usually positioned at this place but if it is not, move the cursor to the ‘KDP_A’ with ‘UP’ or ‘DOWN’ switch). 3) Input the indicated value of the model eye in ‘KDP_A’ by pressing ‘+’ or ‘－’ switch. (Input ‘7.500’...
  • Page 45 7.4 Confirmation of data Check if the calibration is achieved correctly with the model eye which is used for the calibration. 1) Press ‘RETURN’ after completing calibration of the model eye to be adjusted. 2) Press ‘RETURN’ switch to return to the ‘MAINTENANCE MODE’...
  • Page 46 8. Reset of setting This menu item is to reset the adjustment data and the setting items of the device to the factory default. When selecting this menu item, the message ‘* Are you sure?’ is indicated and the functions of the operation switches are changed. Press when wishing to reset the adjustment data and the setting items of the device to the...

  • Page 47: Evaluation Of Freeze Image

    11 Evaluation of Freeze Image 11-1 Normal condition If the device is normal and the alignment is achieved correctly, the image as shown on the right appears. 11-2 Measurement image is not displayed If no measurement image is displayed on the Freeze Image screen after measurement, measurement cannot be taken.
  • Page 48 a) Unnecessary reflection of cornea If there are too many unnecessary reflections close to or on the image when switching to the Freeze Image screen, measurement cannot be taken. There are 2 possible causes of the phenomenon. ① The distance between the examinee and the measurement unit (working distance) is not adequate.

  • Page 49: Replacement Procedure Of Each Unit

    12 Replacement Procedure of Each Unit All maintenance operation most be done by technicians approve by Essilor instrument service center. 12-1 Replacement of head cover, control board, EEPROM board and body cover 12-2 Replacement of optical unit ASSY 12-3 Removal of LCD ASSY, replacement of LCD relay board, LCD cover...

  • Page 50: Replacement Of Head Cover, Control Board, Eeprom Board And Body Cover

    12-1 Replacement of head cover, control board, EEPROM board and body cover ・Removal of head cover 1) Remove the fixation screws (2 each for right and left). 2) Pull up the head cover and remove it. (Condition ①) Condition ① ・...

  • Page 51: Replacement Of Optical Unit Assy

    12-2 Replacement of optical unit ASSY Remove Measuring window ring From the condition ① (Refer to 12-1) 1) Remove the measuring window counterclockwise) ring (rotate it 2) Unscrew 2 fixation screws, and then remove the face cover. Harnesses 3) Remove 5 connected harnesses. 4) Unscrew 4 fixation screws, and then replace the optical unit ASSY.

  • Page 52: Removal Of Lcd Assy, Replacement Of Lcd Relay Board, Lcd Cover Unit And Lcd Unit

    12-3 Removal of LCD ASSY, replacement of LCD relay board, LCD cover unit and LCD unit ・Removal of LCD ASSY LCD ASSY Earth harness Hexagon nut Harness From the condition ① (Refer to 12-1) 1) Remove 1 connected earth harness and 2 harnesses. 2) Loosen the hexagon nut and then remove the LCD ASSY.
  • Page 53 ・ Replacement of LCD relay board LCD relay board From the condition④: 5) Remove 5 connected harnesses and 4 fixation screws, and then replace the LCD relay board. Harness Harness Condition ④ ・Replacement of LCD cover unit From the condition④: 6) Remove 1 connected harness and 4 fixation screws, and then replace the LCD cover unit.

  • Page 54: Replacement Of Printer Control Board, Thermal Printer And Printer Cover Unit

    12-4 Replacement of printer control board, thermal printer and printer cover unit ・Replacement of printer cover Thermal printer (platen unit) 1) Remove the printer (platen unit) after unscrewing 2 fixation screws. 2) Fix the removed platen unit on the replaced printer cover unit. Printer control board ・Replacement of printer control board Harness...

  • Page 55: Replacement Of Pd Assy, Switching Supply And Power Switch

    12-5 Replacement of PD ASSY, switching power supply and power switch ・Removal of base plate 1) Lock the main unit slide lock and lay down the device on the buffer materials such as a sponge. 2) Unscrew 6 fixation screws (2 in blue circles and 4 in red circles), and then remove the base plate.

  • Page 56: Replacement Of Joystick Handle And Measurement Switch

    12-6 Replacement of joystick handle and measurement switch 1) Unscrew 1 fixation screw, and then remove the joystick handle by pulling it up. Joystick handle Measurement switch 2) Remove the measurement switch by pulling it to the direction B. 3) Remove the hexagon nut which fixes the measurement switch, and then remove the measurement switch.

  • Page 57: Rewriting Procedures Of The Software Of Akr550

    13 Rewriting Procedures of the software of AKR550 Introduction Do not conduct re-writing if it is not necessary because it might be incompatible with adjusting data and hardware depending on version of the program. Make sure to print adjusting data out before conducting re-writing. To be ready ・RS-232C cable (9pin-9pin straight cable) ・Re-writing program (ComUpdate.exe Ver 1.0.0.4)
  • Page 58 Selection of writing program Press « Select » button and select a file to re-write. 4. File selection Button 5. Name of the file...
  • Page 59 Start-up of program mode When auto-ref is turned on, the power indicator lights up and lights off soon. Right after that, press the buttons from 1 to 5 of figure. 2 in order quickly. If the screen of Figure. 3 does not appear, turn the power off and start over from “Start-up of program mode”.
  • Page 60 Press “Print switch” once and make sure that “Hyper” is displayed at the upper right corner of the screen and baudrate, 115200bps, is displayed at the lower right corner of the screen. Baudrate Press the communication start button (“send”) of ComUpdate on PC. Files are transferred from PC to auto-ref.

  • Page 61: Packing Mode

    Writing of program is automatically started after completion of transferring files to auto-ref. After writing of program is completed, display of auto-ref is changed as below. Make sure that numbers and alphabets displayed below of Appli match with the ones provided with the program file.

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