KaVo KEY Laser III 1243 Technician's Instructions
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KaVo KEY Laser III 1243 Technician's Instructions

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Technician's instructions
KEY Laser III 1243
Always be on the safe side.

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Summary of Contents for KaVo KEY Laser III 1243

  • Page 1 Technician's instructions KEY Laser III 1243 Always be on the safe side.
  • Page 2 Sales: Manufacturer: KaVo Dental GmbH Kaltenbach & Voigt GmbH Bismarckring 39 Bismarckring 39 D-88400 Biberach D-88400 Biberach Tel. +49 7351 56-0 www.kavo.com Fax +49 7351 56-1488...

  • Page 3: Table Of Contents

    Technician's instructions KEY Laser III 1243 Contents Contents Contents ................................1 1 Overview of functions ............................3 1.1 Physical basics ............................3 1.1.1 What does the term laser mean? .....................3 1.1.2 What is laser radiation? ........................4 1.1.3 How does laser radiation form? ......................8 1.1.4 Processes involved in the creation of laser radiation Excitation of the laser medium ....11...
  • Page 4 Technician's instructions KEY Laser III 1243 Contents 3.8 Safety devices ............................173 3.9 Control unit ............................174 3.10 Mechanical system ..........................175 3.11 KEY Laser complete ...........................176 2/176...

  • Page 5: Overview Of Functions

    Light multiplication by Multiplication by timulated stimulated mission of Emission of adiation Radiation The designation “KaVo Key Laser“ is derived from the first letters of the company name and the substances of the laser medium used. rbium 3/176...

  • Page 6: What Is Laser Radiation

    Technician's instructions KEY Laser III 1243 1 Overview of functions 1.1 Physical basics 1.1.2 What is laser radiation? Laser radiation is an electromagnetic wave. The electromagnetic wave does not require a material substrate for propagation. Thus, its maximum propagation rate of c = 299,792,458 m/s is reached in the va‐...
  • Page 7 Technician's instructions KEY Laser III 1243 1 Overview of functions 1.1 Physical basics Collimation Laser radiation is strongly collimated, i.e. the light rays are almost parallel. This means that the laser beam does not increase much in diameter over extended di‐...
  • Page 8 Technician's instructions KEY Laser III 1243 1 Overview of functions 1.1 Physical basics Monochromasia Laser radiation is monochromatic, i.e. all light wave trains have the same frequency, energy and wavelength (the wavelength of the Er:YAG laser is 2.94 µm). ② Intensity ④...
  • Page 9 Technician's instructions KEY Laser III 1243 1 Overview of functions 1.1 Physical basics Coherence Laser radiation is coherent, i.e. all light wave trains are exactly in phase with regard to both time and space. Laser ⑥ spatial coherence ⑦ temporal coherence ⑥...

  • Page 10: How Does Laser Radiation Form

    Technician's instructions KEY Laser III 1243 1 Overview of functions 1.1 Physical basics Transverse electromagnetic modes The local intensity distribution in the beam is of great importance in addition to the three essential characteristics of laser radiation mentioned above. This intensity distribution is described by "transverse electromagnetic modes"...
  • Page 11 Technician's instructions KEY Laser III 1243 1 Overview of functions 1.1 Physical basics In the KEY Laser, which belongs to the family of solid-state lasers, an yttrium alu‐ minium garnet laced with the rare-earth element erbium (abbreviated Er:YAG) is used for the therapeutic laser.
  • Page 12 Technician's instructions KEY Laser III 1243 1 Overview of functions 1.1 Physical basics If the energy that is fed to the oscillatory circuit by the amplifier is greater than the loss in the oscillatory circuit, the signal in the oscillatory circuit greatly increases and, as a result, so too does the output signal ②.

  • Page 13: Processes Involved In The Creation Of Laser Radiation Excitation Of The Laser Medium

    Technician's instructions KEY Laser III 1243 1 Overview of functions 1.1 Physical basics 2,94 µm Ka Vo Er: Y AG ~ 700 - 950 nm ⑥ Totally reflecting mirror (HR) with op‐ ④ Input energy for the amplifier (laser tical resonator - feedback. λ = wave‐...
  • Page 14 Technician's instructions KEY Laser III 1243 1 Overview of functions 1.1 Physical basics The process used for the therapeutic laser employed in the KEY Laser is excitation by high-intensity light, referred to as optical pumping. Contrary to this, the semiconductor laser used as the pilot laser in the KEY Laser is excited directly by electric current.
  • Page 15 Technician's instructions KEY Laser III 1243 1 Overview of functions 1.1 Physical basics Optical pumping If the laser medium is exposed to high intensity light, higher energy levels can be populated by means of absorption. This process is referred to as optical pumping.
  • Page 16 Technician's instructions KEY Laser III 1243 1 Overview of functions 1.1 Physical basics Energy levels The beginning of laser activity is reached by spontaneous emission. The process of induced emission is then the basis for laser amplification. In order to make use of this process, electrons in an atom (ion, molecule, solid body) must have been raised from a lower energy level to a higher level.
  • Page 17 Technician's instructions KEY Laser III 1243 1 Overview of functions 1.1 Physical basics The 4-level system First, the upper energy level E is reached by optical pumping from base level E Level E3 is very short-lived. A rapid transition to level E - without radiation - follows.
  • Page 18 Technician's instructions KEY Laser III 1243 1 Overview of functions 1.1 Physical basics Absorption in the laser medium Absorption is a transition from a lower energy level (base level E ) to an excited higher energy level E . This is caused by a quantum of radiation (photon) from the...
  • Page 19 Technician's instructions KEY Laser III 1243 1 Overview of functions 1.1 Physical basics Spontaneous emission in the laser medium Electrons that are now at the excited higher energy level E have a tendency to spontaneously return to the base level E after a very brief lingering period.
  • Page 20 Technician's instructions KEY Laser III 1243 1 Overview of functions 1.1 Physical basics Induced emission in the laser system If a photon with the energy E impinges on an excited electron located at the higher energy level EB, the drop to the basic energy level EA is greatly accelerated.

  • Page 21: Laser Wavelengths

    Technician's instructions KEY Laser III 1243 1 Overview of functions 1.1 Physical basics 1.1.5 Laser wavelengths The diagram shows the types of laser most commonly used in medical applications and their characteristic wavelengths. These include, in particular, the therapeutic laser (Er:YAG, 2.94 µm) and pilot laser (indium gallium aluminium phosphite, 635 nm) which are both used in the KEY La‐...

  • Page 22: Optical System

    Technician's instructions KEY Laser III 1243 1 Overview of functions 1.2 Optical system 1.2 Optical system Lens system function. 20/176...

  • Page 23: Electrical System

    Technician's instructions KEY Laser III 1243 1 Overview of functions 1.3 Electrical system 1.3 Electrical system 1.3.1 Control unit The KEY Laser 3 control unit is a PC-based CPU module with processor. There is a specially adapted BIOS in the CPU module with a DOS-based operating system.

  • Page 24: Software /Start-Up Process

    Technician's instructions KEY Laser III 1243 1 Overview of functions 1.3 Electrical system The control computer is also equipped with 4 serial interfaces (COM ports). Plug X 1 -> above VEM -> Diagnodent Plug X 3 -> energy measuring unit Plug X 6 ->...
  • Page 25 Technician's instructions KEY Laser III 1243 1 Overview of functions 1.3 Electrical system File Function Mode.com ROMDOS tool to adjust the baud rate of the ex‐ ternal service interface for the service PC (COM1). ATTENTION: This function is not used during servicing.

  • Page 26: Measuring And Configuration

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program 2 Measuring and configuration 2.1 Control unit service program 2.1.1 Service mode overview Requirement Service menu Main menu (password 07351) Note The following table is based on software version 2.19...
  • Page 27 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program MP: 2 Menu for starting up the laser, calibration, et ce‐ commis‐ tera. sioning / MP 2-0: select energy power meter Select the connected energy meter adjust‐...

  • Page 28: Connect Service Notebook

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program 2.1.2 Connect service notebook Requirement ● An adapter cable for the service notebook is required for connecting the note‐ book (PC). ● The adapter must have two nine-pin socket connectors.

  • Page 29: Communicating With Key Laser 1243

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program Socket at KEY Laser 1 Socket at the notebook Pin 5 Pin 5 Pin 2 Pin 3 Pin 3 Pin 2 Note For source, see service equipment catalogue.
  • Page 30 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ▶ Select connection e.g. via Com 1 ③. Note The selection depends on the respective configuration of the computer and must be individually adapted. COM1 is used as an example! ▶...
  • Page 31 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ▶ Enter the following parameters (Com 1 properties): 19200 bits per second 8 data bits No parity 1 stop bit No protocol (flow control) ▶ Choose OK to confirm.

  • Page 32: Direct Communication With The Control Unit

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program 2.1.4 Direct communication with the control unit Note Direct communication with the control computer is for analysing errors in the soft‐ ware or the control computer.
  • Page 33 2.1 Control unit service program ▶ Switch on the key-operated switch, turning as far to the right as possible. The KaVo logo and the message “PLEASE WAIT“ are displayed briefly on the touch screen display. ▶ Touch the top right-hand corner of the touch screen display.
  • Page 34 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ① BIOS sequence. Output at 9600 ④ If during the boot sequence you press baud. INFO: The communication the service key on the touch screen software in the notebook is set to display, the file "service.exe"...
  • Page 35 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program Sending files from the KEY Laser to the notebook Requirement First the target folder of the file to be received must be entered in the hyper terminal.
  • Page 36 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ▶ Use the Send function in the Hyper Terminal to select the required “service.exe“ file and to send this to the KEY Laser. The message “Upload complete“ confirms that the file transfer has been successful.
  • Page 37 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program Direct communication in the case of missing or damaged files ▶ Example: The file service.exe is not available. ① The BIOS sequence. Output 9600 baud.

  • Page 38: Switch Key Laser Service Mode On/Off

    ▶ Switch the main network switch to I. ▶ Turn on the key-operated switch, and turn it to the right stop. The KaVo logo and the message "PLEASE WAIT" appear on the touchscreen display. ▶ Touch the right top corner of the touchscreen display.

  • Page 39: The Service Mode Main Menu

    Switch off ▶ Key to the last menu item. ▶ Confirm Power off with ▶ System shutdown and then the KaVo Logo appear with the message "PLEASE WAIT". The KEY Laser turns itself off. 2.1.6 The service mode main menu The main menu of the service mode provides information on: ①...

  • Page 40: Operating Control

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program Operation Moves the selection bar ④ upward. Once the top selection position of the menu has been reached, renewed actuation moves the selection bar to the lowest position.
  • Page 41 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program Display Serial Number Meaning: Display serial number The command "Display Serial Number" shows the type (1) and the serial number (2) of the KEY Laser.
  • Page 42 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program Display operating period This command is used to display the operating period. The Display operating period command displays: The operating period ① since initial start-up with the date ②.
  • Page 43 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program Display error list This command is used to display the error list. The Display error list command displays: The selected energy errors with the date ① in the following format: month, day, year, time ②...
  • Page 44 This command is used to clear the counters and operating period. Note The pulse counter serves to document operating data of important KEY laser com‐ ponents. Only delete the pulse counter after express instructions from KaVo. Confirm the command Clear counters/op. period with OK, and the following safety query appears: If you confirm the safety query with YES, the pulse counter and operating hours are deleted SINCE OPERATING PERIOD.
  • Page 45 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program Report This command is used to send reports The "Report" command sends the report ① via the service interface to the notebook with the following data: ②...
  • Page 46 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ⑩ Measured value table ⑫ Error list ⑪ Pulse counter 44/176...
  • Page 47 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ⑬ Error list on energy deviations 45/176...

  • Page 48: System Control/Tests

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program 2.1.8 System control/tests System controls and tests. Selecting this command will bring up the following submenu: Note The EXIT key returns you to the main menu.
  • Page 49 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ▶ Press OK once more This switches the laser power supply and cooling system back off. The message LASER POWER SUPPLY OFF is displayed in the status bar (1).
  • Page 50 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ▶ The message WAIT FOR SIMMER appears in the status bar ①. When the flashlamp is lit, the message SIMMER OK is displayed in the status bar ①.
  • Page 51 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program Display input ports This command is used to display input ports. Choose OK to confirm the Display input ports command. The status of both the VEM – INPUTS and CONTROL UNIT INPUTS will be dis‐...
  • Page 52 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ▶ Choose EXIT to return to the System control/tests menu. Footcontrol test This is the footcontrol test ▶ Choose OK to confirm the Footcontrol test command.
  • Page 53 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program Shutter/Absorber test This is the shutter and absorber test Choose OK to confirm the Shutter/Absorber test command. The shutter and absorber will open and close alternately.
  • Page 54 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program Speaker test This function is used to test the speaker ▶ Choose OK to confirm the Speaker test command. The test begins at a frequency ① of 500 Hz and sound volume ② level 1.
  • Page 55 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ▶ Confirm the "Test outputs" command with okay. The following display appears: Components/signals With this test, you activate the following components and signals: Note If you confirm the various tests with OK except for the test Usetpoint analogue out, display 2 appears.
  • Page 56 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program Test valve WATER = Switches the spray water electrovalve on and off. Note Exiting water; do not wet optical and electrical components. Test valve 3/4 = not currently in use.

  • Page 57: Commissioning Adjustments

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ▶ Choose OK to confirm the spray (water & air) on/off command. The message SPRAY ON is shown in the status bar. ▶ Choose OK once again.
  • Page 58 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program Selecting this command will bring up the following submenu: To return to the main menu, choose EXIT. Select energy power meter This function is used to select the energy power meter Note Only properly adjusted energy meters are permitted for the KEY laser.
  • Page 59 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ▶ Choose OK to confirm the Select energy power meter command. To return to the Commissioning adjustments menu choose EXIT. ▶ Select the required energy power meter, Ophir NOVA, Gentec EM1 or Gentec PRJ –...
  • Page 60 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ▶ ENERGY power meter serial no.: = Enter the serial number of the energy power meter and choose ENTER to confirm. ▶ Measuring head serial no.: = Enter the serial number of the measuring head and choose ENTER to confirm.
  • Page 61 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program The laser power supply, cooling system, compressor and flashlamp switch on au‐ tomatically. ▶ Choose OK to confirm the Defection mirror adjustment command. The laser pulse generator is on standby together with the drive for 60 mJ/1 Hz.
  • Page 62 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ▶ Enter the required values and choose NEXT STEP to confirm. Automatic energy adjustment This function is used to perform an automatic energy adjustment Note The entire description of startup is found in the assembly instructions.

  • Page 63: Static Data Setup

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ▶ Touch the screen The MEASURED VALUE TABLE is displayed. Energy safety check Note Meaning: Safety check of energy Note The entire description of startup is found in the assembly instructions.
  • Page 64 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program Standard initialisation Standard initialisation Note To save the control and measured value table, first save the file USER.DAT on the service notebook (see the command Send USER.DAT).
  • Page 65 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ▶ Choose EXIT to return to the Static data setup menu. ▶ Next transfer user.dat back to the KEY Laser or perform an energy adjustment and safety check.
  • Page 66 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ▶ Choose OK to confirm the Change time command. To abort and return to the Static data setup menu, choose EXIT. The time currently being used by KEY Laser is displayed ①.
  • Page 67 This function is used for turning KaVo factory commissioning mode on or off Note This menu item is not for service and is only for initial startup at KaVo. Note The plant startup mode generally has to be switched off. In the selection, the fol‐...
  • Page 68 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program Send user.dat This function is used to send the user.dat file Note This file is always sent in the format user.dat by the KEY Laser. If another file is in the format user.dat on the notebook/PC, it is overwritten.
  • Page 69 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ON/OFF Optimized Feedback Meaning: Turn the optimised feedback on/off The command "ON/OFF Optimized Feedback" activate/deactivate the optimised feedback function. The status is displayed in the status bar (1).

  • Page 70: Diagnodent Service

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program The US code may only be set to ON when the laser is purchased in the USA. In this case, Set Detect and Feedback to OFF.

  • Page 71: Software Download

    KEY Laser. All safety cut-outs are disabled! Only use this mode for testing. ▶ Choose YES to confirm. The KaVo logo is displayed briefly together with the message: control.exe start in X-Mode. Never use this mode for application! ▶ Choose Continue; the KEY Laser starts up without a security system, showing the user interface.
  • Page 72 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program ▶ Connect the service notebook to the KEY Laser. ▶ Start the Hyper Terminal communications software. ▶ Choose OK to confirm the Software download command.

  • Page 73: User Mode Error Messages/Causes

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program 2. Control.exe 3. Service.exe 4. Ztrans.exe 5. Default.dat 6. Default.usr 7. *.stx(gr.stx) 8. *.prg(gr.prg) 9. k3_sde.eep 10. Rominit.bat *The number of these files can vary depending on the number of languages in user mode.
  • Page 74 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program Error message Explanation/possible cause errors SYSTEM ERROR 5 Checksum error in control.exe (internal test of control.exe). The error is recognized by boot.exe, i.e. control.is not started, and the laser turns off without an error message.

  • Page 75: Control Computer Status Leds

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program 2.1.15 Control computer status LEDs Function table of the status LEDs on the control computer Description Colour operation LED1 SW status LED1 - flashes while the laser is operating at the same time as the emission display (only in ope‐...
  • Page 76 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.1 Control unit service program Description Colour operation Key-operated switch display. When the key-operated switch is in ON po‐ sition (or vertical), the LED shines Shutter Shines when the shutter is trigge‐...

  • Page 77: Optical System

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system 2.2 Optical system 2.2.1 General cleaning of optical components Clean the valuable coated optical components in the KEY Laser without applying pressure and only using the following materials: ▪...

  • Page 78: Er:yag Crystal

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Visually check the surface. ▶ Repeat cleaning if necessary. ▶ Before the optical components are exchanged due to difficult to remove conta‐ mination, try to remove the contamination with a Q-tip and acetone.
  • Page 79 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Mount the mouth mirror Mat. no. 0.236.2507 between the HR mirror ① and the crystal end surface and visually inspect the crystal and surface. ▶ Use the same principle to visually check the crystal end surface facing the PR mirror ②.
  • Page 80 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ If spots/dots are visible on the end faces of the crystal, the Er:YAG crystal must be removed, cleaned and reinstalled in accordance with the Service Technician's instructions.
  • Page 81 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Unscrews the 8 fastening screws of the pump chamber 5, and carefully remove the pump chamber upward out of the KEY laser. ▶ Place the pump chamber on a lint-free cotton cloth.
  • Page 82 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Hold the Er:YAG crystal vertically by the crystal sleeve and sprinkle >99% ace‐ tone over the the end face ③. ▶ Without applying pressure, wipe a sheet of lens cleaning paper over the end face ④.
  • Page 83 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Carefully shove the Er:YAG crystal axially with the sleeves back into the pump chamber. ▶ Affix the two O-rings and lightly screw on the flange ⑥, centre the Er:YAG crystal ⑦...
  • Page 84 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ insert the pump chamber with the 8 fastening screws into the KEY laser and screw it tight. ▶ Make sure that the flash lamp lines are run correctly according to the drawing, and tightly remount the HR mirror with the holder.
  • Page 85 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Screw on the flash lamp lines. ▶ Start the KEY Laser in the service mode. ▶ Switch the flash lamp to simmer mode with the commands system control / tests, laser supply / cooling s.
  • Page 86 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Use the mouth mirror Mat. no. 0.236.2507 to check the seal of the two crystal end surfaces. ▶ Check the seal of the pump chamber. ▶ Then perform a complete adjustment according to these instructions.

  • Page 87: Pr Mirror

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system 2.2.3 HR/PR mirror Check the HR/PR mirror surfaces ▶ Switch off the KEY Laser. ▶ Remove the hood and cover of the optical system. 85/176...
  • Page 88 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Use the mouth mirror Mat. no. 0.236.2507 to check the mirror surfaces of both the HR mirror and the PR mirror. ▶ If there are any spots or dots on the mirror surfaces, the HR and/or PR mirror must be removed, cleaned and reinstalled in accordance with the instructions.
  • Page 89 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system HR mirror with holder ▶ First, completely unscrew the middle fixing screw ① of the HR mirror holder. ▶ Then slightly loosen the other two fixing screws and push the HR mirror holder to the right.
  • Page 90 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system PR mirror with holder ▶ First, completely unscrew the middle fixing screw ② of the PR mirror holder. ▶ Then slightly loosen the other two fixing screws and push the PR mirror holder to the left.
  • Page 91 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Lay out a lint-free cotton cloth Mat. no. 1.001.8616 and place the HR mirror and PR mirror with holders onto it. ▶ Carefully unscrew the knurled nut ③ and remove the washer, the O-ring and the HR mirror from the holder.
  • Page 92 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Place a sheet of lens cleaning paper on the HR mirror and, without applying any pressure, wipe over the surface of the mirror. Wipe at a speed whereby the acetone evaporates before it reaches the end of the lens cleaning paper.
  • Page 93 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Install in the following sequence: HR/PR mirror Mat. no. 4.. O-ring Mat. no. 5.. WasherMat. no. 6.. Knurled nut Mat. no. 7.. 91/176...
  • Page 94 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Hold the HR mirror on the lateral surface with a pair of tweezers, and carefully insert into the mirror holder. ▶ If necessary, shove in with a Q-tip.
  • Page 95 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ First, gently screw in the two outer screws, push the holder to the left and screw in the middle screw. ▶ Tighten all three screws. ▶ Insert the three fastening screws into the PR mirror holder, and insert the PR mirror with the holder into the KEY laser.

  • Page 96: Deflection Mirror

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ First lightly tighten the two outer screws and move the holder to the right, and screw in the middle screw. ▶ Tighten all three screws. ▶ To make subsequent optical adjustment easier, mount the HR and PR mirror holders parallel to the pump chamber.
  • Page 97 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Perform a visual check of the mirror of energy measurement unit ① and the mirror of pilot input unit ②. ▶ If spots/dots are visible on the mirror surfaces, remove, clean and reinstall the mirror of energy measurement unit ①...
  • Page 98 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system Remove the deflection mirror ▶ Remove deflection lens system ▶ Unplug the two connecting plugs 2, screw out the two fastening screws 1, and remove the deflection lens system from the KEY laser.
  • Page 99 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Remove the energy measuring mirror ③ ▶ Screw out the 4 fastening screws, lay the two-part cover and O-ring aside, and carefully remove the energy measurement mirror out of the holder.
  • Page 100 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system Clean the surfaces of the deflection mirror ▶ Sprinkle > 99% acetone over the surface of the mirror of the energy measure‐ ment unit. 98/176...
  • Page 101 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Use a cotton bud with a wooden stem to prevent the energy measurement unit mirror from slipping. ▶ Place a sheet of lens cleaning paper on the energy measurement unit mirror and, without applying any pressure, wipe the surface of the mirror.
  • Page 102 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Comply with the following installation sequence: Mirror ③/④ O-ring ⑤ Cover ⑥ Installing the mirror of the energy measurement unit ▶ Using tweezers, hold the mirror of energy measurement unit ③ by its lateral surface and carefully insert into the mirror holder.
  • Page 103 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ If necessary, push it in using a cotton bud. ▶ Place the O-ring on the mirror of the energy measurement unit and screw tight the two-part cover according to the drawing.
  • Page 104 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Insert the deflection optical system into the KEY Laser and fix with the screws ⑦. ▶ Connect the two connecting cables ⑧ and ⑨. ▶ Insert the screen correctly into the terminal strip.

  • Page 105: Lens Coupling

    The lens in the input block is harmonised with the Er:YAG crystal in the Z axis. This is done by a spacing ring that is made by KaVo specially for this adjustment. Hence the input block and/or the lens can only be exchanged in the "Measure exchange input block"...
  • Page 106 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system Check lens surfaces ▶ Switch off the KEY Laser. Remove the hood and cover of the optical system. Note It is easier to identify contamination and damage to the lens when it is removed.
  • Page 107 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Using a plane mouth mirror, perform a visual check of both lens surfaces. 105/176...
  • Page 108 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ If any spots or dots were visible on the lens surfaces, remove, clean and reinstall the lens in accordance with sections D 2.5.2 – D 2.5.5. Then perform a complete alignment to assess any energy loss.
  • Page 109 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Unscrew bonding 1 and disconnect connection 2. ▶ Unscrew safety switch (3). 107/176...
  • Page 110 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Disconnect the water (4) and air (5) spray connections. 108/176...
  • Page 111 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Unscrew the laser hose coupling (4 screws 7). 109/176...
  • Page 112 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Using the allen key (8), material number 1000 7108, unscrew the adapter photo sensor (6). ▶ Carefully remove the spring, filter (9) and diode housing (10) from the laser hose coupling.
  • Page 113 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Loosen the hexagonal nuts (5) with the flat wrench and unscrew the spring- loaded parts (6) by two turns of the allen key. ▶ Unscrew the adjusting screws (7) with two turns of the allen key also.
  • Page 114 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Using the adjusting ring key (3), completely unscrew the ajdusting ring (8). 112/176...
  • Page 115 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Pull the lens holder (9) out of the laser hose coupling. 113/176...
  • Page 116 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Using the lens key (10), unscrew the threaded ring (11) and remove the lens from its holder. ▶ Do not dismantle the lens holder any further. The specially manufactured spacer ring must remain installed within the lens holder.
  • Page 117 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system Clean the lens surfaces ▶ Sprinkle > 99% acetone over the lens surface. 115/176...
  • Page 118 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Use a cotton bud with a wooden stem to prevent the lens from slipping. ▶ Place a sheet of lens cleaning paper over the lens and, without applying any pressure, wipe over the lens surface.
  • Page 119 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system Reinstall lens ▶ Insert lens into lens holder (1), convex side down, making sure that the lens is completely horizontal in the lens holder. ▶ Using the lens key, screw the threaded ring on securely.
  • Page 120 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Position the lens holder (1), making sure that the four adjusting screws are poin‐ ting to the centre of the bearing-surface area. Insert lens holder into laser hose coupling in this position until it reaches setting 2.
  • Page 121 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Using the adjusting ring key, tightly screw on the adjusting ring (4). ▶ Input block basic adjustment Note INFO: To later couple in (B 4.6 Assembly Instructions) the laser beams into the fibers of the laser hose, the full adjusting range of the x / y axes must be available.
  • Page 122 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Place the glass plate and autocollimator on the input block according to the dra‐ wing. By changing the position of the autocollimator and rotating the spring pressure piece 5 and adjusting screws 6, the reflection point of the lens must be visible in the autocollimator relative to the reflection point of the glass plate.
  • Page 123 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system Install laser hose coupling ▶ Insert the filter ⑦, the springs and the diode of the adapter for the photosensor ⑧ into the diode seat ⑨, and screw tight to the input block.
  • Page 124 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Connect and secure the water (10) and air (11) spray connections. 122/176...
  • Page 125 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Screw down the laser hose coupling tightly. 123/176...
  • Page 126 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Screw down bonding 12 tightly and connect connection 13. ▶ Screw the safety switch (14) down tightly. Note Startup should then follow installation instructions at least from the section "Input block position".

  • Page 127: Measure Laser Hose Coupling

    The lens in the input block is harmonised with the Er:YAG crystal in the Z axis. This is done by a spacing ring that is made by KaVo specially for this adjustment. The spacer ring is mounted in the lens holder of the input block.
  • Page 128 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system Replace laser hose coupling ▶ Switch off the KEY Laser. ▶ Unscrew laser hose and carefully set it down with the instrument. ▶ Seal the fibre ends (1) with rubber caps.
  • Page 129 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Unscrew bonding ① and disconnect connection ② spray connections. ▶ Unscrew safety switch ③ . ▶ Disconnect the water ④ and air ⑤ spray connections. 127/176...
  • Page 130 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Unscrew the old laser hose coupling. ▶ Use the Allen wrench ⑦ Mat. no. 1.000.7108 to unscrew the photosensor ad‐ apter ⑥. ▶ Carefully remove the spring, the filter ⑧ and the diode seat ⑨ out of the input block.
  • Page 131 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Insert the filter ⑧, the spring and the diode with adapter photo sensor ⑥ into the diode housing ⑨ and screw tightly onto the new laser hose coupling.
  • Page 132 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Screw down the laser hose coupling tightly. ▶ Screw down bonding ⑫ tightly and connect connection ⑬ . ▶ Screw down safety switch ⑭ tightly and fit the laser hose back onto the laser hose coupling.
  • Page 133 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system Replace the Er:YAG crystal ▶ Disconnect the ignition contact ① and unscrew the two flashlamp connections ② . Note In order not to damage the flash lamp connection, unscrew the HR mirror wiht holder 3.
  • Page 134 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Unscrew the fixing screws (8) of the pump chamber (5) and carefully lift the pump chamber out of the KEY Laser. ▶ Place the pump chamber on a lint-free cotton cloth.
  • Page 135 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Carefully push the new Er:YAG crystal ⑦ by its sleeves and on its axis, into the pump chamber. ▶ Mount the two O-rings, gently screw on the flanges ⑥, centre the Er:YAG crystal ⑦...
  • Page 136 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Replace the pump chamber in the KEY Laser and use the fixing screws ⑧ to screw on tight. 134/176...
  • Page 137 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Ensure correct routing of the flashlamp cables according to the drawing and reinstall the HR mirror with its holder. Note To make subsequent optical adjustment easier, mount the HR mirror parallel to the pump chamber.
  • Page 138 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Reconnect the ignition contact. Note Pay attention to the cathode – and anode + connection. ▶ Screw on the flash lamp lines. ▶ Start the KEY Laser in the service mode.
  • Page 139 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Use the mouth mirror (Mat. no. 0.236. 2507) to check that the two end faces of the crystal are airtight. 137/176...
  • Page 140 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Check that the pump chamber is airtight. Note Startup should then follow installation instructions at least from the section "B 4". 138/176...

  • Page 141: Laser Angle Piece 2060

    ▶ Pack the removed input block with the stickers ⑪ in the provided foam. ▶ Send the "gauged input block assembly" to the KaVo repair service indicating the problem, serial number of the KEY laser, control and measured value tables as well as the pulse counter.
  • Page 142 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ① Handpiece ② Exit window ③ Auxiliary tool ④ Nozzle needle ⑤ Spray nozzle Clean and exchange the exit window ▶ Make sure that the KEY Laser is turned off ▶...

  • Page 143: Laser Handpiece P 2061

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ▶ Exchange the O-ring 0.200.6120 of the exit window ②, and then carefully screw the window ② onto the laser angle piece ① ▶ If the deflection mirror cannot be cleaned, it needs to be exchanged Change the deflection mirror ▶...
  • Page 144 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ②Mounted sleeve Mat. no. 1.003.1439 ③Mounted deflection mirror P Mat. no. 1.000.6266 ④Threaded ring Mat. no. 0.574.2052 ⑤Adjusted lens Mat. no. 1.001.0848 ⑥Threaded ring key Mat. no. 1.000.6097 Transmission check If you want to check the energy at the output of laser handpiece P 2061, the trans‐...

  • Page 145: Laser Handpiece E 2062

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system See also: 2.2.1 General cleaning of optical components, Page 75 ▶ Use a pair of tweezers to carefully mount the clean lens on the threaded ring with the flat side of the lens facing the deflection mirror.
  • Page 146 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system ① grip sleeve Mat. no. 1.001.0845 ② coupling (not a replacement part) ③ lens holder (not a replacement part) ④Threaded ring key Mat. no. 0.411.0042 ⑤ spacing ring (delivered with the adjusted lens) ⑥Adjusted lens Mat.
  • Page 147 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.2 Optical system Clean the adjusted lens ▶ Screw off the grip sleeve ① from the coupling ② ▶ Screw off the lens holder ③ from the coupling ② ▶ In the lens holder ③, there is a spacing ring ⑤, the lens ⑥ and a threaded ring ⑦.

  • Page 148: Electrical System

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.3 Electrical system 2.3 Electrical system Two interfering voltage transformers can be selected: ▪ Interfering voltage transformer 1243 Mat. No. 1.000.8437 – Voltages: 100/110/120/127 volts ~ 50 / 60 Hz fuse 25 A.
  • Page 149 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.3 Electrical system ▶ Connect L + N to the mains filter input port. 147/176...
  • Page 150 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.3 Electrical system ▶ Open cable ties. ▶ Unscrew clamp (no longer required when installing external voltage transformers). 148/176...
  • Page 151 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.3 Electrical system ▶ Disconnect plugs X 5 (service notebook connection) and X 7 (door switch/ext. warning lamp) from the control unit. 149/176...
  • Page 152 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.3 Electrical system ▶ Disconnect the two ground wires ②. 150/176...

  • Page 153: Install External Voltage Transformers

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.3 Electrical system ▶ Unscrew the 4 fixing screws ③ and remove the 230 volt ~ connection with mounting bracket from the KEY Laser. 2.3.2 Install external voltage transformers Requirement Before installation, select the desire input voltage 100 / 110 / 120 / 127Volt ~ 50 / 60 Hz.
  • Page 154 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.3 Electrical system ▶ For this purpose, connect the input cable to the appropriate terminal. 152/176...
  • Page 155 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.3 Electrical system ▶ Mount the data sticker associated with the selected input voltage. 153/176...
  • Page 156 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.3 Electrical system ▶ Using a waterproof pen, cross out the information relating to voltage and current on the KEY Laser's rating plate. ▶ In order to be able to push in the external voltage transformer, the screws of the hose clamps ⑤...
  • Page 157 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.3 Electrical system ▶ Stick the rating plate ⑥ onto the mounting plate of the external voltage trans‐ former. 155/176...
  • Page 158 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.3 Electrical system Installation ▶ Lay cable X 7 over the mounting plate and push the external voltage transformer into the mounting aid ⑥. 156/176...
  • Page 159 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.3 Electrical system ▶ Use a shorter mounting screw ⑦ beneath the control unit. ▶ Fix the external voltage transformer with the 4 sleeves and 4 mounting screws ⑧ as shown in the drawing.
  • Page 160 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.3 Electrical system ▶ Plug-in L + N line filter input. Plug-in protective conductor ⑨. 158/176...
  • Page 161 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.3 Electrical system ▶ Plug in plugs X 5 (connection to the service notebook) and X 7 (door switch/ext. Warning light) into the control computer and screw tight. 159/176...
  • Page 162 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.3 Electrical system ▶ Fix all lines with cable tie. 160/176...

  • Page 163: Adjust The Key 3 Diagnodent Electronics When The Distance Standard Is Mounted

    Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.3 Electrical system ▶ Screw the compressed air cylinder back on. ▶ Perform the energy adjustment and “safety check“. 2.3.3 Adjust the KEY 3 Diagnodent electronics when the distance standard is mounted When one of the following components are exchanged, they must all be electrically adjusted to each other: the KEY 3 Diagnodent electronics (Mat.
  • Page 164 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.3 Electrical system Note All optical components (resonator, deflection mirror, pilot laser, input block and laser hose) must be mounted and adjusted according to the assembly instructions before the offset can be checked or adjusted with the "mounted distance standard."...
  • Page 165 Technician's instructions KEY Laser III 1243 2 Measuring and configuration 2.3 Electrical system 163/176...

  • Page 166: Maintenance Work On Key Laser 1243

    Technician's instructions KEY Laser III 1243 3 Maintenance work on KEY Laser 1243 3.1 Ignition system 3 Maintenance work on KEY Laser 1243 Replacement interval: ➊ = once a year ➋ = once every two years 3.1 Ignition system Component...

  • Page 167: Cooling System

    Technician's instructions KEY Laser III 1243 3 Maintenance work on KEY Laser 1243 3.2 Cooling system 3.2 Cooling system Component Jobs to be done Exchange interval Parts to replace as needed Cooling system In service mode, turn on Flow monitor MP 1-0 [laser power sup‐...

  • Page 168: Spray System

    Technician's instructions KEY Laser III 1243 3 Maintenance work on KEY Laser 1243 3.3 Spray system 3.3 Spray system Component Jobs to be done Exchange internal Parts to replace as needed Spray water reservoir Replace O-ring O-Ring ➋ Spray supply bottle Exchange sieve Mat.
  • Page 169 Technician's instructions KEY Laser III 1243 3 Maintenance work on KEY Laser 1243 3.3 Spray system Component Jobs to be done Exchange internal Parts to replace as needed Input block and laser hose Disconnect air and water 2 x O-rings ➊ of the...
  • Page 170 Technician's instructions KEY Laser III 1243 3 Maintenance work on KEY Laser 1243 3.3 Spray system Component Jobs to be done Exchange internal Parts to replace as needed Control valve, cpl. for air Exchange overpressure Overpressure membrane Pressure spring Ls13/Ls43 membrane Mat.

  • Page 171: Optical System

    Technician's instructions KEY Laser III 1243 3 Maintenance work on KEY Laser 1243 3.4 Optical system 3.4 Optical system Component Jobs to be done Exchange interval Parts to replace as needed HR mirror Visually check all mirrors HR mirror 02362352 PR mirror and clean if necessary ac‐...

  • Page 172: Laser Contraangle Handpiece 2060

    Technician's instructions KEY Laser III 1243 3 Maintenance work on KEY Laser 1243 3.5 Laser contraangle handpiece 2060 3.5 Laser contraangle handpiece 2060 Component Work to be performed Replacement interval Parts to be replaced if ne‐ cessary Spray Unscrew spray nozzle and clean fixing bore.

  • Page 173: Laser Handpiece P 2061

    Technician's instructions KEY Laser III 1243 3 Maintenance work on KEY Laser 1243 3.6 Laser handpiece P 2061 3.6 Laser handpiece P 2061 Component Jobs to be done Exchange interval Parts to replace as needed Spray Remove light wedge, fibre Fibre guide mounted guide and instrument inte‐...

  • Page 174: Laser Handpiece E 2062

    Technician's instructions KEY Laser III 1243 3 Maintenance work on KEY Laser 1243 3.7 Laser handpiece E 2062 3.7 Laser handpiece E 2062 Component Jobs to be done Exchange interval Parts to replace as needed Remove fibre plug and un‐...

  • Page 175: Safety Devices

    Technician's instructions KEY Laser III 1243 3 Maintenance work on KEY Laser 1243 3.8 Safety devices 3.8 Safety devices Component Jobs to be done Exchange interval Parts to replace as needed External Visually inspect the pro‐ Laser safety goggles with tective laser goggles.

  • Page 176: Control Unit

    Technician's instructions KEY Laser III 1243 3 Maintenance work on KEY Laser 1243 3.9 Control unit 3.9 Control unit Component Work to be performed Replacement interval Parts to be replaced if ne‐ cessary Update software. Allow for the most recent service update of the KEY Laser 1243 software versi‐...

  • Page 177: Mechanical System

    Technician's instructions KEY Laser III 1243 3 Maintenance work on KEY Laser 1243 3.10 Mechanical system 3.10 Mechanical system Component Jobs to be done Exchange interval Parts to replace as needed Check ease of movement of the swing arm. Check ease of movement...

  • Page 178: Key Laser Complete

    Technician's instructions KEY Laser III 1243 3 Maintenance work on KEY Laser 1243 3.11 KEY Laser complete 3.11 KEY Laser complete Component Jobs to be done Exchange interval Parts to replace as needed Check the power cable for Power cable damage.

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