Essilor AKR 750 Maintenance Manual
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Essilor AKR 750 Maintenance Manual

Essilor AKR 750 Maintenance Manual

Auto kerato refractometer
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Auto kerato refractometer
Maintenance Manual

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Summary of Contents for Essilor AKR 750

  • 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 ......................9 Troubleshooting ......................11 Cleaning of the Parts that Eyes Touch to, the Accessory Model Eye ASSY .... 32 Functional Check ......................

  • Page 3: External View

    1 External View Code Name Code Name LCD monitor LCD cover Main unit cover L Measurement start switch Main unit cover R Joystick handle Clear switch Power supply switch 3D AUTO / MANUAL switch USB terminal CUSTOM switch RS232C terminal Measurement mode select switch Fuse holder Menu switch...

  • Page 4: Internal Structural Diagram

    2 Internal Structural Diagram Code Name Code Name Measurement unit Switching power supply Optical control board ASSY Vertical positioning mechanism Optical ASSY cover Power supply board ASSY PD sensor board Vertical detection sensor board Horizontal movement motor Backside protection cover LCD cover Vertical movement motor Back and forth positioning mechanism...

  • 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 reflected light of this eyeground image is led to the sensor through the measurement system.

  • Page 6: Block Diagram

    4 Block Diagram...

  • Page 9: Wiring Diagram

    6 Wiring Diagram 6-1 Overall view Optical control board Optical unit ASSY CMOS harness Chin rest ASSY Chin holder vertical movement 3 axes control board Joystick ASSY switch board ASSY...
  • Page 10 6-2 LCD ASSY diagram Main control board Operation switch harness Operation switch LCD harness board ASSY 6-3 Chin rest ASSY diagram Chin rest motor ASSY Chin rest sensor harness...
  • Page 11 6-4 Base unit wiring diagram Switching power supply PC I/F board ASSY Power supply board ASSY Power supply switch Fuse holder...

  • Page 12: Troubleshooting

    7 Troubleshooting General description of boards Error message ‘RETRY’ appears Error message ‘EEPROM fault’ appears Error message ‘Motor fault’ appears Error message ‘Printer head heat over’ appears Error message ‘Paper empty’ appears Error message ‘Printer cutter fault’ appears Nothing is displayed on the screen when turning the power on No responses even though pressing switches 7-10 Result is not printed out/printout is not normal...
  • Page 13 7-1 General description of boards This product is composed with peripheral devices, such as 4 control boards, LED, and sensor etc. The micro controller is mounted on 4 control boards below and they work with the instruction from the main control board (UART communication). When the green LED is blinking on the optical control board or 3 axes control board, it is in communication with the main control board.
  • Page 14 7-2 Error message ‘RETRY’ appears. The main causes when the error message ‘RETRY’ appears: ・ When the image is not caught accurately because of the condition of the examinee (he/she blinked or is not looking at the target etc.) ・ Alignment is not adjusted correctly ・...
  • Page 15 7-3 Error message ‘EEPROM fault’ appears. The main causes when the error message ‘EEPROM fault’ appears: ・ Failure of the optical control board ・ Failure of the EEPROM board ‘EEPROM fault’ is displayed. Replace the optical control board. Does the message still appear? Replace the optical unit ASSY.
  • Page 16 7-4 Error message ‘Motor fault’ appears. The main causes when the error message ‘EEPROM fault’ appears: ・ Failure of the motor assy, the optical control board, or EEPROM board ・ Failure of the forcus motor positioning sensor boardor, the target motor positioning sensor board ‘Motor fault’...
  • Page 17 7-5 Error message ‘Printer head heat over’ appears. The main causes when the error message ‘Printer head heat over’ appears: ・ Failure of the printer ・ Failure of the printer control board ‘Printer head heat over’ is displayed. Replace the printer. Does the message still appear? Replace the printer control board.
  • Page 18 7-6 Error message ’Paper empty’ appears. The main causes when the error message ‘Paper empty’ appears: ・ No printer papers in the printer ・ Failure of the printer ・ Failure of the printer control board ‘Paper empty’ is displayed. Are there any papers in the printer? Set the papers.
  • Page 19 7-7 Error message ‘Printer cutter fault’ appears. The main causes when the error message ‘Printer cutter fault’ appears: ・ The printer paper is stuck in the cutter portion ・ Failure of the printer ・ Failure of the printer control board ‘Printer cutter fault’...
  • Page 20 7-8 Nothing is displayed on the screen when turning power on. The main causes when nothing is displayed on the screen when you turn the power on: ・ Blowout of the fuse ・ Failure of the switching power supply ・ Failure of the power supply board ・...
  • Page 21 7-9 No responses when pressing switches The main causes in case of no responses when pressing switches: ・ Failure of the operation switch board ・ Failure of the measurement switch ・ Failure of the main control board No response when pressing No response when pressing the measurement button the operation button...
  • Page 22 7-10 The measurement result is not printed out/printout is not normal. The main causes when the measurement result is not printed out/printout is not normal: The printer setting is OFF. ・ ・ Failure of the printer ・ Failure of the printer control board ・...
  • Page 23 7-11 Ref measurement LED does not light up. The main causes when the ref measurement LED does not light up: ・ Failure of the ref LED board, the optical control board ・ Failure of the main control board Ref LED does not light up. Replace the optical control board.
  • Page 24 7-12 Cannot see the fixation target The main causes when you cannot see the fixation target: ・ Power saving mode is on ・ Failure of the fixation target LED board, the optical control board ・ Failure of the main control board You cannot see the fixation target.
  • Page 25 7-13 Illumination LED does not light up. The main causes when the illumination LED does not light up: ・ Failure of white LED board, infrared LED board, and the optical control board ・ Failure of the main control board The infrared illumination LED, the white illumination do not light up.
  • Page 26 7-14 Kerato LED does not light up. The main causes when Kerato LED does not light up: ・ Failure of Kerato LED board, the optical control board ・ Failure of the main control board Kerato LED does not light up. Replace the optical control board.
  • Page 27 7-15 The fixation target LED for P.K. measurement does not light up. The main causes when the fixation target LED for P.K. measurement does not light up: ・ Failure of the P.K. LED board, the optical control board ・ Failure of the main control board P.K.
  • Page 28 7-16 3 axes motor does not work even though operating a joystick. The main causes when three axes motor does not work even though operating a joystick: ・ Failure of the X,Y, and Z axes motors ・ Failure of 3 axes control board ・...
  • Page 29 7-17 Chin rest does not move. The main causes when the chin rest does not move: ・ Failure of the chin holder vertical movement switch board ・ Failure of the chin rest sensor board ・ Failure of the chin rest motor ・...
  • Page 30 7-18 Cannot communicate with PC The main causes when it cannot communicate with PC: ・ The setting of the communication software is different. ・ Failure of PC I/F board ・ Failure of the main control board Cannot communicate with PC Correct the setting.
  • Page 31 7-19 No power outlet 1. Check the fuse (Note) Please make sure to unplug the power plug before starting this process. Pull the fuse out from the fuse holder and check the conduction. If no conduction is confirmed, replace it with the specified fuse. 2.
  • Page 32 7-20 Abnormal measurement value of model eye ASSY The main causes when abnormal measurement value of model eye ASSY: ・The surface of the model eye ASSY is stained. ・The eye lens is stained. ・Setting of VD is not 12. ・Shift SPH Data is not 0. ・Failure of the optical unit Abnormal measurement value of the model eye ASSY.

  • Page 33: Cleaning Of The Parts That Eyes Touch To, The Accessory Model Eye Assy

    8 Cleaning of the parts that eyes touch to, the accessory model eye ASSY Clean the eye lens and the model eye ASSY as shown below because if they have stains of finger prints or dirt etc. because they affect on the measurement accuracy. 1) Saturate K-dry cleaning material or soft cloth with lens cleaner (absolute alcohol).

  • Page 34: Functional Check

    9 Functional Check Verification of measurement accuracy It is very important to verify measurement accuracy with the model eye ASSY when judging accuracy of the measurement values of this product. Please verify accuracy using the model eye ASSY periodically. 1) Before setting the model eye ASSY on the main unit, make sure there are no scratches or stains on the surface.

  • Page 35: About Maintenance Mode

    10 About Maintenance Mode The maintenance mode has functions that are 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 Starting the maintenance mode up Turn the power on with pressing the ＊＊...
  • Page 36 10-2 Functions of each menu item on maintenance mode 1. Arrange Mode When you choose this menu item, the normal menu screen will be appeared. Refer to operation manual about the contents of each menu item. 2. Freeze Image When you choose this menu after the measurement, the measurement image evaluation screen (image screen) as shown on right side will be appeared.
  • Page 37 4. Shift Target Data When you choose this menu, the screen as shown on Target Shift ＊＊ ＊＊ the right side will be appeared. The position of the Target fixation target will be shifted arbitrarily in the range of +1.0~ -1.0D (0.1STEP). Descriptions of each switch are as shown below.
  • Page 38 1) TARGET LED You can check if the fixation target is lighted up from the measurement window. The fixation target will blink 3 times. 2) REF MEASUREMENT LED You can check if the ref measurement light is lighted up and the camera for ref <-| light receiving is working normally with the monitor.
  • Page 39 Conduct the test print. You can check if the printer is working normally. 7. Calibration 7.1 Calibration This menu item is to readjust the device with the model eye for adjustment, the maintenance tool. When you start this menu item, you need the model eye for adjustment other than the model eye ASSY.
  • Page 40 7.2 REF Calibration ＊＊ REF CALIBRATION ＊＊ 1） Move the cursor to the menu item that you wish to 1． MODEL EYE A 2． MODEL EYE B adjust (refer to the description below) on ‘REF 3． MODEL EYE C 4． MODEL EYE F Down CALIBRATION’...
  • Page 41 2） Make sure that the cursor is positioned at the ‘DPT_A＊’ DPT_A＊ -0.100 (Usually the cursor is at the position but if it is not, AXS_A＊ 0.000 CYL_A＊ -0.460 move the cursor to the ‘DPT_A＊’ with ‘UP’ or ‘DOWN’ SPH_A＊ -2.960 switch.) (＋)
  • Page 42 7.3 KRT Calibration ＊＊ REF CALIBRATION ＊＊ 1） Press switch on the ‘REF CALIBRATION’ 1． MODEL EYE A screen. 2． MODEL EYE B 3． MODEL EYE C 4． MODEL EYE F 5． FINISH Down <-| Return 2） The screen will be switched to the selection screen ＊＊...
  • Page 43 to the screen of ’KRT CALIBRATION’. 2）Make sure that the cursor is positioned at ‘KDP_A＊’. KDP_A＊ 7.500 KR1_A＊ 7.670 (The cursor is usually positioned at the place but if it is KR2_A＊ 7.590 not, move the cursor to the ‘KDP_A＊’ with ‘UP’ or KAX_A＊...
  • Page 44 7.4 Confirmation of data Confirm if the calibration is done correctly with the model eye that is used for calibration. 1）Press ‘RETURN’ after finishing calibration of the model ＊＊ REF CALIBRATION ＊＊ 1． MODEL EYE A eye that need to be adjusted. 2．...
  • Page 45 8. Joystick Calibration 1） Move the cursor to ‘8. Joystick Calibration’ with 又は ＊＊ MAINTENANCE MODE ＊＊ Down 1． A r r a n g e M o d e <-| and press 2． F r ee z e I m a g e 3．...

  • Page 46: Evaluation Of Freeze Image

    11 Evaluation of Freeze Image 11-1 Normal condition If the device is normal and it is aligned correctly, you see the image screen as shown on the right. 11-2 In case that there is no measurement image If you do not see the measurement image as shown on the right after taking a measurement and switching to the Freeze Image, the measurement cannot be taken.
  • Page 47 a) Unnecessary reflection of a cornea If there are too many unnecessary reflections close to the image or on the image when switching to the Freeze Image screen, measurements cannot be taken. There are 2 causes of these symptoms. ① The distance between the examinee and the measurement unit (operating...

  • Page 48: Replacement Procedure Of Each Unit

    12 Replacing Procedure of Each Unit All maintenance operation most be done by technicians approve by Essilor instrument service center. Replacement of the main unit cover unit, the 3 axes control board ASSY 12-1 Replacement of the optical control board ASSY...
  • Page 49 12–1 Replacement of the main unit cover unit, the 3 axes control board ASSY 1) Remove the total of 6 fixing screws that are placed one each on the chin rest side and 2 each on the front side vertically of the main unit cover L and R. 2) The main unit cover L and R are assembled with internal claws (3 places).
  • Page 50 12-2 Replacement of the optical control board ASSY 1) Disassemble the main unit cover L and R (refer to 12-1). 2) Remove 6 harnesses that are connected to the optical control board ASSY. Optical unit cover ASSY Harnesses 3) Unscrew 3 fixing screws of the optical control board ASSY and remove the ASSY. This is the end of disassembling process.
  • Page 51 12-3 Replacement of the optical unit ASSY, CMOS harness 1) Remove the measuring window ring with turning it to the left. 2) Remove the main unit cover L and R (refer to 12-1). 3) Remove the optical control board ASSY (refer to 12-2). 4) Cut the tierap etc.
  • Page 52 12-4 Replacement of the LCD harness, the main control board ASSY, the LCD, the LCD harness, the operation board switch ASSY, the operation switch harness, LCD cover unit 1) Remove the main unit cover L and R (refer to 12-1). 2) Unscrew 4 fixing screws of the LCD cover ASSY, remove 2 harnesses that are connected to, and remove the harness fixing ramp.
  • Page 53 12-5 Replacement of the printer control board ASSY, the printer, the printer cover unit 1) Remove the main unit cover L and R (refer to 12-1). 2) Remove the harnesses and earth that are connected to the front cover ASSY and unscrew 4 fixing screws.
  • Page 54 5) Replace the printer after unscrewing 3 fixing screws and removing the harnesses. At the time of assembly after replacing, be careful about the screw position and the order of fixing the harnesses. Fixing screws (long) Fixing screw (long) Printer main unit Earth harness Fixing screw (short) Washer...
  • Page 55 12-6 Replacement of the chin rest ASSY, the head rest cover, the chin rest sensor harness, the chin rest motor ASSY 1) Replace the chin rest ASSY after unscrewing 3 fixing screws and removing the harnesses that are connected to the main unit. Head rest cover Head rest cover fixing screws...
  • Page 56 12-7 Replacement of the joystick ASSY 1) Press the claw under the joystick cover and remove the cover as pushing up. Joystick cover 2) Replace it after unscrewing 4 fixing screws and removing the harnesses that are connected to. Harness Joystick ASSY Fixing screws 3) Input the correction value indicated on the joystick ASSY complying with the procedure...
  • Page 57 12-8 Replacement of the roller, the measurement start switch board ASSY, the joystick handle unit 1) Press the claw of the stria part and remove the handle cover as pushing it up. Stria 2) Remove 2 harnesses that are connected to the measurement start switch board ASSY. 3) Replace the roller and the measurement start switch board ASSY after unscrewing 2 screws that fix the board.
  • Page 58 12-9 Replacement of the switching power supply, PC I/F board ASSY, the power supply board ASSY 1) Remove the base cover 1. The main unit needs to be tipped sideways. Tip the device on the buffer such as a sponge as you can see the bottom of the device. 2) Unscrew 4 fixing screws of the base cover 2.
  • Page 59 10) You can see the inside of the base if you lift the base cover 1 up. Unscrew 4 screws that fix the mechanical unit ASSY and lift the mechanical unit up. Mechanical unit ASSY Fixing screws The mechanical unit is very unstable so be careful when you remove it. Fix the removed mechanical unit not to fall down.
  • Page 60 16) At the time of assembly of the mechanical unit, match the each eye mark and be careful about misaligning of the mechanical unit to the chin rest. Eye marks Example of matching the eye mark 17) Move the fluctuation mechanical unit and the back and forth mechanical unit that are moved on 5) above to the position that the sensor reacts before the turning power on.
  • Page 61 12-12 Replacement of the measuring window filter, the face cover unit 1) Remove the measuring window ring (refer to 12-3). 2) Remove the main unit cover L and R (refer to 12-1). 3) Unscrew 2 fixing screws of the face cover ASSY. Face cover ASSY Fixing screws 4) Replace the measuring window filter after unscrewing 2 fixing screws of the diffuser.

  • Page 62: Software Update Procedure

    13 Software update procedure Necessary tools : 1. PC : OS Windows Xp or Vista or 7 2. USB cable A/B 3. AKR750 software (SP9095_Vxxx.flash) 4. AKR750 software rewriting program : CompUpdate.exe 5. Driver for AKR750 USB connection Procedure 1) Switch on AKR750 and connect USB cable between AKR750 and PC. 2) Message NEW HARDWARE FOUND will appear, if necessary select the folder where you stored the driver and install it.
  • Page 63 4) The PROGRAMME screen will appear. 5) Press the fourth button from left to select the value 460800 bps and press it again to activate Hyper (see notes). Notes:  first button from left : to select 9600 bps, press it again to select Hyper ...
  • Page 64 6) Open the program ComUpdate. 7) Select the COM Port (it depend on your PC, check it on Device Manager), Select Baudrate to 115200 and Hyper to On. 8) Click on Select and choose the file SP9095_Vxxx.flash 9) Click on Send. 10) During update 3 green belt will appear on AKR750 screen.

  • Page 65: Parking Mode

    14 Parking Mode There is a standby/packing mode on the AKR750. You have to press Clear and Print button at the same time and keep press during minimum 2 second. Then the AKR750 come back to his packing position.

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