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SERVICE MANUAL
12-01000-00.AA
CONFIDENTIAL
STAR MEDICAL TECHNOLOGIES
LIGHTSheerTM Service Manual
1.0 General Information
1.1 Use of This Manual
This manual contains service instructions for the LightSheerTM model Diode Laser system. The content of this manual is intended solely for use by Star Medical Technologies and its authorized service agents. Star Medical Technologies can not be responsible for service attempted by others, and the use of this manual by others is not permitted. There are no User Serviceable parts inside. CAUTION-Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. 1.2 LightSheer Configurations
One LightSheerTM model with two voltage configurations exists today. A model configured to operate on 110Vac ± 10% @ 8 Amps and a model configured to operate on 220Vac ± 10% @ 4 Amps. There is no operational difference between the two, although the circuit breakers and voltage configuration switch settings change. Check the rear panel label for the specific voltage range of the system. 1.3 Approvals and Warning Labels
The LightSheerTM diode laser system is designed and tested in accordance with Star Medical Technologies procedures. A certified ISO 9001 and CE 0044 company. Danger and Warning Labels (laser information, high voltage, and voltage configuration) are located on the rear panel of the Upper Console. The Laser Aperture label is located on the distal end of the handpiece. Note: the laser aperture label may be scrubbed off with aggressive cleaning and if missing, should be replaced. The LightSheer Diode Laser System meets the definition of year 2000 compliant for the purpose of FDA product status reporting. All laser systems manufactured and currently manufactured will work during, from, into and between the twentieth and twenty-first centuries for the expected lifetime of the product. Note: the life-time of the product is currently limited to about 5 years by an on-board, non-rechargable battery that is not user servicable. Therefore, proper operation of the LightSheer with respect to the year 2000 bug beyond the year 2010 is not relevant to this product. The LightSheer Diode Laser System has been tested to 5 years beyond its expected lifetime (up to the year 2010) for proper functionality with repect to year 2000 compliance.
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LIGHTSheerTM Service Manual 1.4 1. Safety Laser - The LightSheerTM is a Class 4 laser system which contains Infra-Red (IR) emitting diode lasers at a wavelength of approximately 800 nm. This infrared radiation is invisible to the human eye, yet is readily transmitted through the cornea and focused on the retina. Even brief exposure to this laser may cause permanent eye damage. All persons during any service activity must wear proper laser safety eyewear (OD +5 @ 790-830 nm). Chemical - A number of hazardous chemicals are used in the operation and service of the laser. Please refer to the specific MSDS for each specific substance: ethylene glycol, acetone, methanol, LocTite, and silicone rubber (RTV). An MSDS for each specific substance is available upon request from Star Medical Technologies. Electrical - The LightSheerTM Diode Laser uses high-voltage internal components which have the potential to cause serious injury or fatal electrical shock. It is possible for the high voltage components to retain a charge for some period of time even after the laser has been turned off. No part of the exterior housing, except the calibration/storage port insert, should be removed except by trained and authorized laser technicians. Do not soak or spray the laser console or handpiece in fluids because this can result in damage to the equipment and electrical shock. Do not operate the unit if the power cord is frayed or otherwise damaged. Opening the exterior housings may cause exposure to hazardous optical radiation and electrical voltage, even after the laser has been turned off. No part of the exterior housing, except the calibration/storage port insert, should DANGER be removed except by trained and authorized laser technicians.
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Fire hazards - The potential for fire hazards exists because the absorption of laser energy may raise the temperature of any material. While this principle is the basis of many useful medical and surgical applications, it requires that precautions be taken against igniting combustible materials. For the LightSheerTM Diode Laser, the following precautions should be taken:
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Allow any flammable liquids used for cleaning the skin, such as alcohol, to fully evaporate before treatment. Anesthetics administered topically or by inhalation must be approved as nonflammable. Exercise particular care in the use of oxygen which can accelerate the combustion of any flammable material. Confidential
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Avoid using combustible materials, such as gauze and drapes, in the treatment area. When required, these materials may be made more fire resistant by keeping them moist with water. Clothing should be kept well away from the area of treatment. Do not operate the laser with any cover or drape over the laser.
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DANGER
Do not operate the laser in the presence of flammable liquids (such as alcohol or acetone) or flammable gases (such as ether).
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2.0
2.1
Calibration, Maintenance and System Checks
Periodic Maintenance
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Action Checklist Perform Visual Inspection 1. Visually inspect the exterior for damage, loose hardware, or signs of wear. Pay special attention to the power cord and cord connector, the footswitch and hose, the door hardware, the calibration port glass, the handpiece, the front switches, and the display assembly. Remove the front cover from the Lower Console (LC) and inspect for loose power supply mount hardware and electrical connections. Reinstall the front cover. Remove the access panel from the Upper Console (UC) and inspect for loose hardware, coolant leakage, and electrical connections. Reinstall the access panel.
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Check/Clean Air Vents 1. For the Lower Console (LC), check the bottom and rear air vents for any build up of dust or debris. Remove dust and debris by wiping with a dampened cloth or by vacuum. For the Upper Console (UC), check the side and rear air vents for any build up of dust or debris. Remove dust and debris by wiping with a damp cloth or by vacuum.
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Check/Replace Coolant Filter 1. Remove the Access Panel and check the date label on the coolant filter. (Some filters may not have a date label attached. If no label is attached, contact Star Medical Technologies to determine the age of the system). If today's date is 12 ± 3 months from either the date label on the filter or the age of the laser, replace the coolant filter.
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Change Coolant Confidential
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It has not been determined if the coolant needs to be changed/flushed at a regular basis. At a minimum, the coolant level should be topped off (fill to the neck of the reservoir) at each service event. Clean Console Exterior Using a soft cotton cloth dampened with a general purpose detergent cleaner, wipe down the exterior of the console. Clean Handpiece and Umbilical Cord Using a soft cotton cloth dampened with a general purpose detergent cleaner, wipe down the handpiece and umbilical cord. Clean Energy Detector Window The protective window above the energy meter must be kept clean for accurate energy calibration. The window is cleaned by (1) turning the access screw on the top of the console a quarter turn counter-clockwise, (2) removing the calibration port insert, (3) cleaning the window in the same manner as the handpiece tip or with common glass cleaners, taking care to remove any haze remaining from the cleaning solution by wiping with a clean, dry towel, (4) carefully reinstalling the calibration port insert, and (5) tightening the access screw with a quarter turn clockwise. Check for Proper Form and Fit 1. 2. 3. 4. 5. Check to see that the display swivels and tilts. Verify that the handpiece fits inside the door pocket. Verify that the umbilical cord is not too long or too short. Verify that the door latch mechanism works. Verify that the console latch mechanism works.
Perform Operational and Safety Check Out Go to Section 2.2 of the Service Manual and perform the Operational and Safety Check Out procedure.
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LIGHTSheerTM Service Manual
2.2
Operational and Safety Check Out
The Operational and Safety Check Out procedure should be performed at the completion of each service call to verify proper operation of the laser system. Time Boot Sequence Turn system on, start clock (stopwatch). The system should display the Start Screen in 90 seconds or less. Check Safety Circuits 1. Push the Emergency Stop button in and verify that the message "Emergency Stop button has been depressed" appears on the display. Rotate the button to reset and verify the message disappears. Turn the Key switch and verify that the Key icon with directional arrow appears on the display. Rotate the key clock-wise and counter clock-wise. Remove the Interlock plug from the rear panel and verify that the Interlock screen appears on the display. Replace the interlock plug. Lift Handpiece from holster and verify that the Handpiece icon is displayed along with the down arrow. Replace the handpiece in the holster and verify that the icon disappears. When the Footswitch icon and down arrow appears on the display step on the footswitch (hold it down) and verify that the icon disappears. Also, listen to the footswitch pressure sensor at the rear panel to hear a "click" when the pedal is depressed. Verify that the Handpiece Trigger icon is displayed. When the trigger is pulled and held down, the system will fire 4 calibration shots and deliver a "beep" with each shot. Place the Handpiece in the holster, step on the Footswitch, and pull the Trigger. Verify that the calibration test passes (User screen is displayed and a maximum fluence of 40J/cm2 can be selected.) Turn the key, then push the Quit button on the display. Wait a moment and verify that the "Turn off System at Rear of Console" message appears. Calibration, Maintenance and System Checks: 2-3 Preliminary
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LIGHTSheerTM Service Manual 10. Turn the Main Breaker off and verify that the system shuts off.
Measure/Verify Delivered Energy Caution - the following procedure involves firing the laser and delivering hazardous levels of optical radiation. Verify that the laser is located in a Class 4 Laser Controlled Area and that all persons present are wearing proper laser safety DANGER eyewear. Do not fire the laser in the presence of flammable liquids or gasses.
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From the User screen, select ChillTip = OFF, pulse width in Auto Mode, Fluence (from the table below) and go to Ready. Direct the output of the handpiece into the external detector head (keep the sapphire tip approximately 1/4" above the detector head surface) and step on the footswitch. Pull the trigger to deliver laser pulses. Delivered pulse energies should fall into the ranges listed below. Request Fluence = 10 J/cm2: Measure 6.89 9.32 J (8.1 J nominal) Request Fluence = 25 J/cm2: Measure 17.2 23.3 J (20.25 J nominal) Request Fluence = 40 J/cm2: Measure 27.5 37.3 J (32.4 J nominal) Calculate the delivered pulse energies by averaging 5 shots from each range. From the main user screen, select ChillTip = OFF, pulse width in 30 ms Mode, Fluence (from the table below) and go to Ready. Direct the output of the handpiece into the external detector head (keep the sapphire tip approximately 1/4" (6 mm) above the detector head surface) and step on the footswitch. Pull the trigger to deliver laser pulses. Delivered pulse energies should fall into the ranges listed below. Request Fluence = 10 J/cm2: Measure 6.89 9.32 J (8.1 J nominal) Request Fluence = 25 J/cm2: Measure 17.2 23.3 J (20.25 J nominal) Request Fluence = 40 J/cm2: Measure 27.5 37.3 J (32.4 J nominal) If any of the pulses fall outside the listed ranges, calibration is required. See the Calibration Procedure in Section 2.3. There may be additional work to be done on this procedure. 2.3 Calibration Procedure
If the delivered pulse energy differs by more than ±15% of requested energy (requested energy equals displayed FLUENCE x 0.810), verify that the Energy Detector Window and Handpiece Tip are clean and perform another system calibration. If the delivered pulse energy still differs by more than ±15% of requested energy, perform the calibration procedure listed below. Confidential
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Caution - the following procedure involves firing the laser and delivering hazardous levels of optical radiation. Verify that the laser is located in a Class 4 Laser Controlled Area and that all persons present are wearing proper laser safety eyewear. Do not fire DANGER the laser in the presence of flammable liquids or gasses.
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Calibration Set-Up 1. Ensure that the LightSheer system is turned off and the power cord is disconnected. Use glass cleaner and lens tissue to clean the handpiece tip. If the tip does not appear to be clean (i.e. can see residue) on the exterior surface or if the sapphire lens is internally contaminated or fractured, replace the Handpiece/Umbilical assembly. Remove calibration pocket after loosening the quarter-turn fastener. Thoroughly clean the protective window above the energy meter with glass cleaner and lens tissue. Blow out any particles with compressed air or nitrogen. Re-install the calibration pocket and tighten the quarter-turn fastener. Turn power on to the external energy meter display with its rear panel rocker switch. Instructions for setting up the Molectron Energy Meter are in Section 6.
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Calibrate the System 1. Turn on the LightSheer main power at rear of lower console and place the laser in Service Mode. Refer to section 3.9 of the Service Manual. Press the [D] button to enter the Diagnostic screen. Turn the ChillTip OFF. Set the current on channel A to 2.100 Volts by pressing the [Current SP A] field and entering the 2.100 from the pop-up menu. This setting corresponds to 21 A. Set Current SP A to 2.100 Volts: _______ (check to confirm) 4. Set the current on channel B to 2.100 Volts by pressing the [D] [Current SP B] field and entering the 2.100 from the pop-up menu. This setting corresponds to 21 A. Set Current SP B to 2.100 Volts: _______ (check to confirm)
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LIGHTSheerTM Service Manual 5. Set the pulsewidth to 0.030 s by pressing the pulsewidth field and entering the value from the pop-up menu. Set Pulse Width to 0.030 s: _______ (check to confirm) 6. Ensure that the handpiece is fully seated in the calibration port on the LightSheerTM system. Fire a single pulse into the calibration port while keeping the handpiece fully seated and immediately read the peak voltage on the energy meter readout. To fire from the Diagnostic screen, depress the footswitch, wait for the shutter to come fully open (the shutter motor is audible unless the electronic shutter retrofit has been performed), depress and hold the handpiece trigger, and press the Trigger button on the screen. Repeat for (4) more shots, immediately recording the energy meter peak voltage after each shot. (With software versions of 0.19 and higher, the energy meter peak voltage is recorded at the end of the event line in the diagnostic screen.)
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Internal Energy Meter Measurements (Record): Pulse 1 Voltage: ____________ V Pulse 2 Voltage: ____________ V Pulse 3 Voltage: ____________ V Pulse 4 Voltage: ____________ V Pulse 5 Voltage: ____________ V (X.XXX) (X.XXX) (X.XXX) (X.XXX) (X.XXX)
If the voltage readings appear to be unstable, verify that the ChillTip = OFF and that there is no condensation on the sapphire tip. Repeat the measurements. 8. Compute and record the average energy meter voltage for the five shots. The average is the sum of the five shots divided by 5. If the voltage average is not between 3.75 4.75 V, see the Energy Detector Assembly change procedure. Avg. Voltage: ____________ V (X.XXX, average = sum of above 5 voltages / 5.0) 9. Compute and record the minus 5% deviation limit from the average by multiplying the average voltage by 0.95.
Low Voltage Limit: ____________ V (X.XXX, low limit = 0.95*average voltage)
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LIGHTSheerTM Service Manual 10. Compute and record the plus 5% deviation limit from the average by multiplying the average voltage by 1.05.
High Voltage Limit: ____________ V (X.XXX, high limit = 1.05*average voltage) 11. Confirm that all five voltages fall between the minus 5% and the plus 5% deviation limits. If any single shot is not within this range, see Section 4, Troubleshooting. Avg. Voltage greater than 3.75 V and less than 4.75 V: _______
All five pulse voltages greater than the Low Voltage Limit: _______ All five pulse voltages less than the High Voltage Limit: 12. _______
Hold the tip of the handpiece from 1/4" (6 mm) to 1/2" (12 mm) above the surface of the external energy detector head. Repeat the following steps five times: Zero the external energy meter display by pressing the "Zero" button. Fire a single pulse into the external energy meter probe. Record the pulse energy in Joules from the external energy meter display. External Energy Meter Measurements: Pulse 1 Energy: ____________ J Pulse 2 Energy: ____________ J Pulse 3 Energy: ____________ J Pulse 4 Energy: ____________ J Pulse 5 Energy: ____________ J (XX.X) (XX.X) (XX.X) (XX.X) (XX.X)
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Note: If the Molectron Energy Meter yields strange values (either all unusually high or low) see Section 6 for instructions on setting up the meter. If the energy readings appear to be unstable, verify that the ChillTip = OFF and that there is no condensation on the sapphire tip. Repeat the measurements. 14. Compute and record the average shot energy in Joules for the five shots. The average is the sum of the five energies divided by 5. If the average shot energy is not between 26 36 J, see Section 4, Troubleshooting. Avg. Energy: ____________ J (XX.XX, average = sum of above 5 energies / 5.0) Avg. Energy greater than 26 J and less than 36 J: Confidential
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LIGHTSheerTM Service Manual 15. Compute and record the minus 10% deviation limit from the average by multiplying the average pulse energy by 0.90. Low Energy Limit: ____________ J (XX.XX, low limit = 0.90*average energy) 16. Compute and record the plus 10% deviation limit from the average by multiplying the average pulse energy by 1.10. High Energy Limit: ____________ J (XX.XX, high limit = 1.10*average energy) 17. Confirm that all five pulse energies fall between these minus 10% and plus 10% deviation limits. If any single shot is not within this range, see Section 4, Troubleshooting. All five pulse energies greater than the Low Energy Limit:_______ (yes, pass) All five pulse energies less than the High Energy Limit:_______ (yes, pass) 18. Compute and record the calibration coefficient of the on-board energy meter. The coefficient has the units of J/cm2/V and is given by the following formula: (Avg Pulse Energy in Joules) / (Avg Voltage) / (0.81 cm2). Coefficient = Average Energy / 0.81 / Average Voltage) Coefficient: ____________ J/cm2/V (X.XXX) Record the Coefficient on the Service Report. 19. Confirm that the calibration coefficient just calculated is between 7.6 and 11.0 J/cm2/V. If not, repeat this procedure. Coefficient greater than 7.6 and less than 11.0 J/cm2/V: 20. 21. 22. Press the [Return] button to exit the Diagnostic screen. Press the [S] button to enter the Setup Screen. Enter the calibration coefficient (obtained in step 18) into the Detector field by pressing on the field to pop-up the numeric entry menu. Press [Return] to exit the Setup Screen. Place the handpiece in the holster, depress the footswitch and pull the trigger. The system will perform a system calibration. If prompted for a cleaning, lift handpiece from pocket, release footswitch, replace handpiece in pocket and 2-8: Calibration, Maintenance and System Checks Preliminary _______ (yes, pass)
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LIGHTSheerTM Service Manual depress footswitch. Follow the screen prompts for another calibration. If more than one cleaning prompt occurs, go to the beginning of this procedure and repeat. 25. 26. From the treatment screen, press the [S] button to enter the Setup Screen. Record the Headroom Auto Mode and Headroom 30 ms Mode values on the Service Report. Headroom Auto Mode: ____________ (X.XX) Headroom 30 ms Mode: ____________ (X.XX) 27. Confirm that the "Headroom Auto" is greater than 1.20 and "Headroom 30 ms" is greater than 1.20 and check Pass on the Energy Meter Calibration Data Sheet. If not, see Section 4, Troubleshooting. Headroom Auto Mode greater than 1.20: _______ (yes, pass) Headroom 30 ms Mode greater than 1.20: _______ (yes, pass) Note: the Headroom values of 1.20 is a shipping specification for a new system. 28. 29. Press [Return] to return to the Startup Screen. Turn off the key and press the Quit button and follow the screen prompts to turn off power to the system.
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3.0
3.1
Theory of Operation
Overview
Based on diode laser technology, the LightSheerTM Diode Laser System produces pulsed infrared light intended for hair removal and the treatment of leg veins. The laser system consists of a two-part console, a footswitch, and a handpiece connected to the console with an umbilical. Laser light is generated in the handpiece by the laser diode arrays and exits at the sapphire tip that also serves as a skin cooler. A microprocessor-based controller (microcontroller) monitors the system, provides fault checking, and controls the laser operation. The operator interacts with the controller via a touch-screen display located on the top of the console Like all pulsed lasers, the LightSheerTM produces a pulse of coherent light with a specific wavelength. The LightSheerTM wavelength is nominally 800 nanometers, in the near infrared region of the spectrum just beyond the visible range. For the intended medical applications, the most important pulse characteristics are (1) the fluence, expressed in Joules per square centimeter, which is the amount of optical energy delivered to a given area of skin, and (2) the duration or pulse width, expressed in milliseconds. The fluence is the most relevant single measure of exposure dose. Other key laser parameters are the pulse repetition frequency in pulses per second and peak power in watts. The general functions of the system components are described in this section. Operation of the laser, including proper use of these components, and the installation of the system is described in the User Manual. 3.2 Power Conditioning
The components used in the power conditioning system consist of (1) the power cord, (2) the power input module, (3) a circuit breaker that also acts as the main switch, (4) a terminal block which connects the (5) voltage selector switch with the (6) isolation transformer, and (7) the low voltage power supplies which converts line voltage alternating current into low voltage direct current for use by the control electronics, the user interface, the laser (diodes), the laser power supply, and the cooling system. Input Voltage - the laser requires power from a standard wall outlet to be in the range for which the system was built. The two voltage ranges are: 110 ± 10% Vac @ 8 Amps or 220 ± 10% Vac @ 4 Amps. The power can be either 50 Hz or 60 Hz. Circuit Breaker - depending upon the voltage range for which the laser was built, either a 4 Amp breaker (for 220 Vac systems) or an 8 Amp breaker (for 110 Vac systems) will be installed. The circuit breaker also functions as the mains disconnect, or the on/off switch.
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LIGHTSheerTM Service Manual Voltage Selector Switch - a voltage selector switch is incorporated into the system and should be set to the closest value to match input voltage. The voltage selector switch must be properly set to insure that the input to the primary side of the isolation transformer is correct. Isolation Transformer - the transformer, and auto transformer, is wound with multiple input taps on the primary side and if the mains voltage is correct and the voltage selector switch is set to match mains voltage, the transformer secondary voltage will be approximately 120 Vac. The isolation transformer output is directly connected to the Low Voltage Power Supplies. Low Voltage Power Supplies - a bank of six low voltage power supplies is incorporated into the system to convert 120 Vac into low voltage direct current. Each low voltage power supply serves some load. The outputs of each supply and the load it serves are listed below: Low Voltage Power Supply PS1 - 24 Vdc (adjusted to 16 Vdc) @ 2A PS2 - 48 Vdc @ 2A PS3 - 48 Vdc @ 2A PS4 - +5 @ 3 A, ± 12 Vdc @ 2 A PS5 - 12 Vdc @ 12 A PS6 - 12 Vdc @ 8 A 3.3 Control Electronics Load The outputs of PS1, PS2 and PS3 are in series for a combined output of 112 Vdc to charge the Cap Bank Computer, display, and Main boards Main TEC, LC fan Pump, UC fan, and ChillTip Cooler
The components used in the control electronics system consist of (1) an i486TM based single board computer module with a display interface, 64 megabytes of random access memory, an I/O board containing A/D and D/A circuitry, a disk drive controller and keyboard interface, (2) a hard disk drive for storage of the computers operating system, program files, and laser configuration data, and (3) the Main board assembly (top and bottom) which communicate with the I/O board and distribute power and signals to the rest of the system components. Single Board Computer Assembly - the computer is a PC style computer responsible for controlling the entire LightSheer system. The assembly consists of a Intel® i486TM microprocessor, a super VGA display controller, two 32 megabyte random access memory boards, a Diamond-MMTM I/O board containing input/output ports, A/D and D/A circuitry, an IDE disk drive controller and keyboard interface. The computer's configuration is held in battery backed-up CMOS. The computer Confidential
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LIGHTSheerTM Service Manual assembly gets power from the Main-Top Board and is mounted to the top of the Upper Monolith Assembly. Hard Drive - a 3.2 Gigabyte fixed disk is utilized for storage of the computer's operating system (Microsoft-DOS®), device drivers, program files (Microsoft-Windows `95TM Shell and LightSheerTM program), and laser configuration data (current limits, repetition rate limits, and detector calibration coefficients). Activity file(s) are also stored on the hard drive which logs each event (such as turn on, calibration shots, pulses delivered, and errors detected). Each activity LOGFILE contains the last 10,000 events. The Hard Drive is mounted to the Top Cover Assembly. Main Board (Top and Bottom) Assembly - the Main board assembly is the primary interface between the Computer assembly's I/O board and the rest of the system components. The board distributes signals and power and is mounted on the front right of the Upper Monolith Assembly. 3.4 User Interface
The components of the User Interface consist of (1) a back-lit color LCD display panel with infrared (IR) touch screen, (2) a keyswitch and emergency stop switch, (3) the footswitch, and (4) a remote interlock plug. LCD Display - a back-lit active-matrix flat panel color LCD (Liquid Crystal Display) is housed in the Display Panel Assembly and is the visual interface for the operation of the laser system. Laying over the top surface of the LCD Display is an infrared (IR) touch screen. Areas or zones of the touch screen are defined by XY coordinates and any interruption that falls within a specified zone are interpreted by software. The touch screen is connected to the Main-Top Board. Switches (Key and Emergency Stop) - the Key and Emergency Stop switches are located on the exterior of the Front Door Assembly and are primary safety features. The laser cannot be operated without the Key. Both the Key and the Emergency Stop Switches are required to enable the Laser Power Supply to deliver current to the FET Board. If at any time the Emergency Stop Switch is depressed, the Laser Power Supply will be disconnected from the FET Board and Handpiece preventing the laser from firing. Footswitch - a pump style pneumatic footswitch is incorporated into the system for both safety and simplicity. Depressing the footswitch increases air pressure in the footswitch hose, activating a pressure switch. When the pressure switch opens, the system will command the Shutter to open. Remote Interlock Plug - a headphone style remote interlock connector is installed at the rear panel of the Upper Console and can be used as a safety feature to disconnect Confidential
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LIGHTSheerTM Service Manual the Laser Power Supply from the FET Board and Handpiece preventing the laser from firing. Normally a (shorted) plug is installed in the jack, although a customer may choose to connect the plug to a treatment room door switch. 3.5 Laser and Delivery System
The diode lasers are incorporated into an optical delivery system located in the handpiece. The components of the handpiece consist of (1) a liquid cooled, micro-lensed diode laser array module followed by a (2) motor driven mechanical blade shutter with position limit switches (This would only apply to Light Sheers with the mechanical shutter. To the later model Light Sheer or retrofits that have the electronic shutter this would not apply.) with a (3) fresnel lens and a (4) highly reflective light guide (condenser) to direct the radiation to a (5) liquid cooled sapphire tip, and a (6) trigger mechanism to deliver laser pulses, a (7) heat exchanger to cool the diode arrays in contact with the hot side of the (8) thermo-electric cooler which cools the sapphire tip in a closed-loop plumbing system by circulating the liquid with the assistance of a (9) small pump. The temperature of the sapphire tip is monitored and controlled to 4 +2 degrees C by a temperature controller. Diode Laser Array - the Diode Laser Array consists of two parallel columns (side A and side B) of five banks of diode modules each. Each diode module consists of ten diode bars, and each bar contains many diode lasers. Each diode bar is covered by a microlens to collimate the laser beams. The array is mounted to the Backplane Heat Exchanger for cooling. NOTE- Configuration and number of bars subject to change without notice.
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B A
DIODE BAR
5 BANKS PER COLUMN
10 BARS PER BANK
2 COLUMNS PER ARRAY
Mechanical Shutter - a motor drive Shutter (metal blade) is located between the Diode Laser Array and the ChillTipTM and will prevent laser exposure when closed. The mechanical shutter will drive out of the beam path when the laser is in the Treatment Mode and the Footswitch is depressed. Limit switches detect the position of the blade to be open or closed. Note: Some handpieces have an electronic shutter installed and do not require the use of the motor drive or limit switches. Fresnel Lens - a fresnel lens is used to collect the collimated laser light from the Diode Laser Array and direct the light towards the sapphire tip. Condenser - a highly polished gold plated wave guide (condenser) is used to redirect any scattered laser light from the fresnel lens and deliver it to the sapphire tip.
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Diode Array Sapphire Tip
Condenser Fresnel Lens
Sapphire Tip (ChillTipTM) - the ChillTipTM, a 9 mm x 9 mm square lens made of sapphire, is the output aperture of the Handpiece. Laser light is transmitted through the tip to the patient skin. To prevent tissue damage, the tip is wrapped in a cooling loop to maintain a tip temperature in the range of 4 +2 degrees C. Trigger - a trigger switch is pulled to command the laser to fire. The trigger switch is active when the laser is in the Treatment Mode and the Shutter is open (footswitch down). As long as no faults are detected and the footswitch remains depressed, the laser will fire at a rate of one shot per second when the trigger is depressed and held. Backplane Heat Exchanger - the laser diode array and the hot side of the ChillTipTM Thermo-Electric Cooler are mounted to the backplane heat exchanger. Coolant from the Main Cooling loop is pumped through the backplane to remove heat. Thermo-Electric Cooler (a Peltier device) - the Thermo-Electric Cooler is a two sided ceramic device where one side gets hot drawing heat from the other side (which gets cold) as a current is passed through. The cold side is used in a small closed loop cooling circuit to cool the ChillTipTM. Confidential
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Backplane Heat Exchanger
Pump
Diode Array ChillTip
TEC Module Temp Sense
TE Controller
8.0
From PS6 To / From Main Heat Exchanger
Cooling Loop w/Standard Chill TipTM
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Backplane Heat Exchanger
Pump
Diode Array ChillTip
TEC Module Temp Sense
TE Controller
4.0
From PS6 To / From Main Heat Exchanger
Cooling Loop w/Calibrated Chill TipTM
TEC Controller - located on top of the Upper Monolith Assembly, the TEC Controller (right hand side) is programmed to maintain a ChillTipTM temperature in the range of 4 +2 degrees C. The temperature of the ChillTipTM is monitored, and if it gets warmer than the set point temperature of 4 degrees C (8 degrees C on older models), it allows current to flow through the Thermo-Electric Cooler. Pump (ChillTip) - a small liquid pump is located in the Handpiece to move the coolant from the cold side of the Thermo-Electric Cooler to the ChillTipTM and back. Confidential
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3.6
Laser Power Supply
The laser power supply consists of (1) the combined [summed] outputs of PS1, PS2, and PS3, a (2) balanced series-parallel capacitor bank which acts as a current source, a (3) computer controlled power relay allowing a controllable connect/disconnect of the capacitor bank with the (4) FET [Field Effect Transistor] Board that contains the FETs that regulate the amount of current flow from the capacitor bank to the diode laser array. The length of time current is allowed to flow (laser pulse width) is controlled by a programmable timer circuit. PS1 + PS2 + PS3 - the outputs of PS1, PS2 and PS3 are connected in series to generate 112 Vdc @ 2 Arms (negative with respect to ground) and stored in the capacitor bank. Capacitor Bank - a balanced series-parallel capacitor bank is utilized to store energy for the Diode Laser Array. The capacitor bank consists of four 180k microfarad capacitors. The capacitors are charged anytime the Lower Console is energized (plugged in and breaker on). The energy stored on the capacitor bank can be calculated using the formula: J = 1/2 C V2, where C = 0.18 and V = 112. The capacitor bank is the current source for the laser diodes. Power Relay - the function of the power relay is to deliver energy stored on the capacitor bank to reach the FET Board via the J2/P2 Connector.
PS1 PS2 PS3
16 V 48 V 48 V
2.5k
Power Relay
2.5k
Power Module Connector pins 1 & 9 pins 2 & 10
All Caps =180kuF
FET Board - the FET Board is mounted to the FETs (Field Effect Transistors) which are mounted to the main heat exchanger of the Upper Monolith Assembly. A control voltage to the gate of the FET will allow a measured amount of current to pass from drain to source. Current passes from the Capacitor Bank, through the FET, Confidential
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LIGHTSheerTM Service Manual to the Diode Laser Array. The length of time that the FET is ON (passing current) defines the width of the laser pulse. 3.7 Cooling System
The components in the cooling system consist of (1) liquid coolant that is circulated to the handpiece by means of a (2) pump through the cold side of a (3) thermo-electric cooler module which is mounted to the (4) heat exchanger that is cooled by ambient air forced across the heat exchanger by a (5) muffin fan. The temperature of the coolant is monitored and controlled to 19 degrees C by a temperature controller. Coolant - a mixture of 20% ethylene glycol (Prestone® anti-freeze) and 80% water used in both the main cooling loop and the ChillTipTM cooling loop. Pump - a constant flow rate pump is incorporated to force the liquid coolant through the main heat exchanger, through a particle filter, to the Backplane Heat Exchanger located in the Handpiece. A fill tank/reservoir is located just above the pump. Thermo-Electric Cooler (a Peltier device) - the Thermo-Electric Cooler is a two sided ceramic device where one side gets hot drawing heat from the other side (which gets cold) as a current is passed through. A number of Thermo-Electric Coolers are used in the main heat exchange. The cold side is used in the main closed loop cooling circuit to cool the FETs and the Backplane Heat Exchanger in the Handpiece. Temperature Controller - located on top of the Upper Monolith Assembly, the temperature controller (left hand side) is programmed to maintain a coolant temperature of 19 degrees C. The temperature of the coolant is monitored, and when it gets warmer than the setpoint temperature of 19 degrees C, it allows current to flow through the Thermo-Electric Cooler. Heat Exchanger - the liquid coolant flows through a metal heat exchanger where heat is absorbed by the metal and transferred from the cold side of the Thermo-Electric Coolers to the hot side. Fan - a large muffin fan draws ambient air into the rear of the Upper Console and forces it through an aluminum heat sink attached to the hot side of the Thermo-Electric Coolers.
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From PS5 Temp. Sense TEC Modules Heat Sink
19.0
TE Controller
FET
Warm Air Out
Particle Filter Fill Tank / Reservoir To / From Handpiece Backplane Heat Exchanger Cool Air In
FAN
Pump
Heat Exchanger
Temp. Sense
SmartFan Controller
3.8
User Software
The User software is stored on the hard drive and is set up as the "boot" program so that upon system turn on, the microcontroller will grab the program files from the hard drive and load them into memory. The program will begin to run under the Microsoft Windows shell. After startup and calibration, the microcontroller displays the treatment screen which provides system information and allows the operator to set laser parameters, control the skin cooler (ChillTipTM), and reset the shot counter. The screen features are described here.
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The ChillTip button toggles the cooling on and off to the sapphire tip. When first turned on, the ChillTip requires less than one minute to cool to its operating temperature, during which time the "Cooling" message is displayed on the screen. The laser cannot be fired if the ChillTip is on but not at operating temperature. For safety, the ChillTip is on by default and a confirmation screen appears when the ChillTip is turned off. In addition, if the ChillTip is off, the "OFF" indicator flashes red as a warning to the user. Opti-PulseTM The Opti-Pulse button controls the laser's temporal pulse width. Opti-Pulse has two user selectable modes: "Auto" and "30 ms". In "Auto" mode, the microcontroller selects the minimum pulse width allowable at a given fluence (equal to the fluence divided by two, in milliseconds). In "30 ms" mode, the pulse width is fixed at 30 ms, independent of the fluence setting. Fluence The fluence setting in J/cm2 is displayed on a digital indicator near the center of the screen. To adjust the fluence, press the adjacent up and down arrows to increase or decrease the setting. The standard fluence range is 10-40 J/cm2 and the default fluence is the value last used for treatment. Status Indicator The laser status indicator is located on the bottom of the treatment screen and has three states: "Cooling", "Standby", and "Ready". When the ChillTip is on but not at its operating temperature (above its setpoint temperature), the status indicator shows "Cooling". When the system is ready for use and the footswitch is not depressed, "Standby" is displayed. Depressing the footswitch causes the shutter to open, and when sensed to be fully open, the status message changes to "Ready". Whenever the system is "Ready", pulling the handpiece trigger will result in laser emission. Shot Counter Useful for recording the number of pulses in a treatment, the shot counter in the upper right corner of the treatment screen tallies each laser pulse. A reset button is located adjacent to the digital indicator. Pressing the reset button clears the present shot counter value and returns the count to "0000". Pressing the numbers themselves will reveal the total shots fired on the system. This value is not resettable. Pressing the numbers again will return the system to the original setting. (NOTE- This is only available on software version V0.19.) Confidential
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LIGHTSheerTM Service Manual User Calibration From the treatment screen, the operator can perform a calibration of the laser energy by inserting the handpiece into the holster, depressing the footswitch, waiting for the "Ready" indicator, and pulling the trigger. At that point, the calibration screen will appear and a four shot calibration will occur. 3.9 Service Software
The Service software is nested within the User software and by default, is not activated. System and laser parameters are accessible from the service screens. Access to and use of the Service routines is to be strictly limited to trained service personnel. Caution - Do not instruct users or non-trained technical personnel to access or utilize these routines. Mis-calibration, laser damage, and/or a non-functional system may result from improper settings of the service screens! Access to Service Software There are two methods to activate Service software: (1) Upon system turn on, the microcontroller will look at the Main-Bottom board configuration switch, SW1-1, to see if it is open (OFF, reset) or closed (ON, set). If the bit is set, the service routines will be activated, as indicated by the letters [D], [S], and [Q] scattered around the display. Selecting [D] or [S] will get into the two useful service screens. Pressing [Q] locks the computer up - so don't press it. If the switch method is employed to enter Service software, verify that the switch position is returned to its default position so that there is no chance the user can get into Service software. (2) Depress the emergency stop switch, then play the three note "Mary had a little lamb" song near the bottom of the display and wait a second. A new screen with the options "Normal Operation", "Service", "Demo", and "Service & Demo" will appear on the display. Select "Service". Once "Service" has been selected play the three note "Twinkle Twinkle Little Star". The normal screen will return with the letters scattered as described above. To leave Service software is this method is employed, either quit and turn off the system as normal or depress the emergency stop switch, play the three note "Mary had a little lamb" song near the bottom of the display and wait a second. A new screen with the options "Normal Operation", "Service", "Demo", and "Service & Demo" will appear on the display. Select "Normal Operation" and play "twinkle, twinkle, little star" near the bottom of the display. The system will return to the normal User software. The [S]etup Screen and [D]iagnostic Screen with a description of fields and default values are shown in the following figures.
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3 2 1 7
Set up Dat a 4
Det ec t or
I ( A) 1: 1 5.0 2: 3 0.0 3: 1 5.0 4: 2 1.0
P W ( s) 0 .005 0 .005 0 .030 0 .030
Fmin 1.0 5.0 1 0.0 2 0.0
Fmax 9.0 2 4.0 4 0.0 6 0.0
cD[ 0] cD[ 1] ( J/ cm^2) 0.6 0.6 3.7 3.7 0.0 - 1.00 0.0 - 1.00 0 .00 0 .00 0.6 0.6 3.7 3.7 0.0 - 1.00 0.0 - 1.00 0 .00 0 .00
cD[ 2] 0.6 0.6 3.7 3.7 0.0 - 1.00 0.0 - 1.00 0 .00 0 .00
cD[ 3] 0.6 0.6 3.7 3.7 0.0 - 1.00 0.0 - 1.00 0 .00 0 .00
J/ cm ^ 2/ V
1 0.00
A ut o Limit s
Imax ( A)
8
3 7.0
Fmax ( J/ cm^ 2 )
9
40
3 0 ms Limits
Imax ( A)
10
5
Language Select ion
m at min PW (W/ A) It h at min PW ( A) m at max PW ( W/ A) It h at max PW (A)
2 7.0
Fmax ( J/ cm^ 2 )
11
English
40
Dera t ing
Base Freq ( Hz)
12
6
Headroom Aut o Mode Headroom 30 ms Mode
1 .00
Fmax @ Base Freq ( J/ cm^ 2)
13
RETUR N
40
Setup Screen Setup Screen Field Descriptions: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Results of recent calibration. Acceptable fluence range for the four shot calibration measurements. Pulsewidth set points for the four shot calibration. Current set points for the four shot calibration. Language selection. Return to the previous screen. Power meter sensitivity (from the manual calibration procedure, Section 2) Maximum diode current allowed in Auto mode. Maximum fluence set point allowed in treatment screen in Auto mode. Maximum diode current allowed in 30 ms mode. Maximum fluence set point allowed in treatment screen in 30 ms mode. Maximum pulse rate frequency of system. Fluence above which pulse rate frequency is reduced to limit avg. power.
Note - Items listed above with a should retain the default value shown in the figure and must never be altered! Confidential
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Digit al Input
0 :No Proble ms 1 :E-St op 2 :Coun t Trig ger 0 3 :Foot swit ch 4 :Shut t er Open 5 :Shut t er Clos ed 6 :Trigg er Pre ssed 7 :Trig ger Re leased 8 :Spare Swit c h 9 :Clinic Door O pen 1 0 :Coun t Trig ger 1 1 1 :A rray Over Te mp 1 2 :Epi Coole r Hot 1 3 :Not In Holst er 1 4 :Not Serv ice Mo de 1 5 :Key Swit ch 1 6 :Over Curre nt A 1 7 :Over Charge A 1 8 :Coun t Trig ger 2 1 9 :Over Power A 2 0 :Over V olt age A 2 1 :Over Cur rent B 2 2 :Over Charg e B 2 3 :Over Pow er B 2 4 :Over V olt age B 2 5 :Pul sewidt h Erro r 2 6 :Coun t Trig ger 3 2 7 :H.V . Relay 2 8 :Not Used 1 2 9 :Not Used 2 3 0 :Not Used 3 3 1 :Not Used 4
1
Digital Out put
0: Word Select 0 2: Pulse Trigger 3: Heat Exchanger 4: High Volt age 5: Chill Tip 6: Not Used 0 7: Not Used 1
Analog In ( Volt s):
0 :Current Mon. A 1 :Current Mon. B
7
2
1: Word Select 1
2 :Ener gy Me t er 3 :DA C readback A 4 :DA C readback B 5 :Not Used 0 6 :Not Used 1 7 :Not Used 2
Analog Out ( Volt s) :
3
SET SHOTS
8
0 :Current S.P. A 1 :Current S. P. B
TRIGGER
v ersion 0.18
RETURN
Pulse:
Pulse Widt h ( s)
9
4
5
10
6
Diagnostic Screen
Diagnostic Screen Field Descriptions: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 3.10 Digital Input Status (a mark indicates that the status bit is active). Digital Output Control (toggle to turn on or off). Event Screen - Record of the last 10 shots. Access to cumulative shot counter reset. Screen Trigger (depress footswitch, pull handpiece trigger, then press Screen Trigger button to fire laser). Return to the previous screen. Analog Voltage Measurements (as measured by system ADC circuitry). Analog Output Command to Diode Arrays (volts x 10 = amps) Pulse Width Command Software Version Number
Demo Software Theory of Operation: 3-15 Preliminary
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Prior to operating the system in Demo Mode the power to the arrays must be disabled by disconnecting the power to the arrays at the FET driver board. DANGER DO NOT OPERATE THE SYSTEM IN DEMO MODE UNLESS THE POWER TO THE ARRAYS HAS BEEN DISCONNECTED. To operate the laser in Demo software, gain access to the Service mode screen as described in Section 3.9 (2) and select "Demo" mode. Operating the system in demo mode simulates complete operation of the system without firing any laser shots. The system will turn on normally and prompt the user to perform the normal start up sequence. The system will perform the four shot calibration without laser emission and mock treatments can be made. Return the system to normal operation (User software) as described in Section 3.9.
!
3.11
Service and Demo Software
This operating mode is not used.
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4.0
4.1
Troubleshooting
Overview
The LightSheerTM Diode Laser Systems is designed to require little adjustment or calibration, and to detect and report hardware malfunctions by Fault Code or error Messages displayed on the screen. In most cases field failures are repaired by changing out assemblies, or groups of parts. Corrective and preventive maintenance must only be performed by a Service Technician who has completed a Certified Training Course on the LightSheerTM Diode Laser System. 4.2 Form and Fit, Mechanical Problems
Covers, Handle, or Skirt Dented or Damaged Dented or damaged covers and handles are generally a sign of improper handling or rough transportation and are typically not covered under system warranty. Upper Console (UC) and Lower Console (LC) Do not Mate Note: this is more common with the "old latch" style (pin and 2 latch). 1. Verify that the UC and LC have the same serial number (although this is not necessarily always the case). Height adjustment pads are located on the LC. Adjust as required. Verify proper orientation of both UC and LC (front of UC lines up with front of LC). In other words, the UC and LC only mate in one orientation. Verify that J2/P2 Module Power Connector alignment posts are not bent, broken, or missing. Repair or replace alignment posts as required. Verify that J2/P2 Module Power Connector is not damaged (check for broken plastic connectors, pushed pins, etc.). Repair or replace as required. Check console latch for proper operation.
2.
3.
4.
5.
Castor Off or System Rocks on Level Ground Tighten any loose castors. Replace any bent, broken or missing castors. Confidential
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Display Won't Stay in Position Replace the display assembly. Handpiece Doesn't Fit in Door Pocket 1. 2. 3. 4. 5. 6. Verify that the umbilical cord is properly wrapped in door. Check to see that the handpiece covers are not damaged. Verify that the handpiece wrist strap is not in the way. Examine the door pocket and verify that it is not damaged. Verify that the umbilical is not too long or too short (see below). The handpiece is not fully inserted in the door pocket.
Handpiece Doesn't Fit in Holster 1. 2. 3. Check to see that the handpiece covers are not damaged. Verify that the handpiece wrist strap is not in the way. Is the holster damaged or incorrectly installed?
Umbilical Too Long or Too Short Remove access panel from UC, cut umbilical tie wrap, slide umbilical cord in or out (depending upon problem), attach new tie wrap, reinstall access panel. Verify that the cooling hoses are not kinked or twisted. Each hose should only have one continuous bend. Front Door Won't Close or Latch Closed 1. 2. 3. Are the handpiece and umbilical properly installed in the door pocket? Door latch broken? Repair or replace it. Door hinges broken or have loose hardware? Repair or replace broken parts. Is the key or a key chain in the way? 4-2: Troubleshooting Preliminary
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LIGHTSheerTM Service Manual 5. Wrist strap in the way?
Front Door Drops Open Airpot(s) require adjustment or replacement. Adjust vent at rear of airpot. Hinges not attached to door or hinges broken. Repair or replace as required. Key/Emergency Stop Switches Mounts Loose Remove front door assembly and tighten mounting hardware. Footswitch Damaged Replace it. 4.3 Turn-on Problems
No Power at Outlet This is not a problem with the laser. The customer needs to rectify the situation. Either the outlet is not connected or is dead. Check for a wall switch or circuit breaker for the outlet. Mains Voltage Incorrect This is not a problem with the laser. The customer needs to rectify the situation. If the voltage is outside the specified tolerance, try another outlet. Make sure that a 110 Vac system is not plugged into a 220 Vac outlet or that a 220 Vac system is not plugged into a 110 Vac outlet. Incorrect selection of outlet voltage will only result in the tripping of the main circuit breaker switch. Power Cord not Properly Connected The power cord must be firmly seated in the socket at the rear of the laser. Some of the cord sockets have a clamping type cord keeper. If a cord keeper is available, make sure it is used. Otherwise, make sure the cord is fully inserted into the socket. Voltage Selection Incorrect There are two types of voltage selectors so first identify which style. Look below the power cord connector. The original (older) style is a red slider, which allows selections of 115 or 230 Vac. The current (newer) style is a black rotary, which give a few more selections of 100, 120, 200, 220, 240 Vac. Measure main voltage and set the switch to the closest value. Confidential
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Circuit Breaker Tripping The circuit breaker should never trip during normal laser operation. If the breaker consistently trips while the laser is in use, verify the current rating of the breaker. Possibly a 4 amp breaker is installed (as it should be on a 220 Vac system) AND the laser is incorrectly configured to operate on 110 Vac. If the breaker will not stay on when first turned on, make sure to hold the breaker in the ON position for a few seconds and verify that the breaker is firmly placed in the ON position. If the breaker will not stay and latch even if held, there must be an internal short circuit. Troubleshoot the power conditioning circuit in the Lower Console. If the breaker rating is correct and is able to remain on for some time, there must be an internal short circuit with a secondary load. Isolate the loads to determine the cause of the over current condition. 4.4 Boot-up Problems System Losing Power and/or Re-booting 1. Check the connector between the upper and lower console. If there are any foreign objects such as foam, remove them and check the pins for damage. Check the 5V power line (TP3 and TP2). This should be 5.0-5.1V. If it is not then check the following. a. Check the voltage drop for the ground and 5V line. It should be no greater than 80 mV. This is done by: 1. Using a voltmeter connect the two leads to the ground (TP1) and the white with black strip line in the lower console ground wire. 2. Using a voltmeter connect the two lead to the 5V (TP2) and the red wire in the lower console 5V power supply. 3. If either voltage drop is greater then 80 mV, replace the connection pins. It may be the pin connection in the Main Bottom board (J10) pins or the pin connections in the lower console. Confidential
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2.
4-4: Troubleshooting Preliminary
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LIGHTSheerTM Service Manual CMOS Data Corrupt The CMOS data is incorrect or has been corrupted. Refer to Section 6.6, CMOS Configuration. Operating System Missing or Not Found or Missing or Corrupt File The hard disk is disconnected or has crashed. Refer to Section 6.7, Rebuild Hard Drive. System Always in Service (small letters scattered around an otherwise normal display) Switch SW1-1 on the Main-Bottom board is incorrectly set. Remove the access panel on the UC to locate the switch. The switch should normally be OFF. Blank Display The display has failed or become disconnected or the display driver board has failed or the computer is dead. 4.5 Start-up Problems
Display Buttons Not Recognized J3 on the Main-Top board may be disconnected or the touch panel is damaged. Keyswitch Operation Not Detected The Keyswitch has failed, a wire in the harness is broken or disconnected, or J8 on the Main-Bottom board is disconnectedor plugged in incorrectly.
Emergency Stop Switch In Rotate the e-stop switch clockwise so that it "pops" out. Handpiece-in-Holster Not Detected 1. 2. 3. The handpiece is not properly seated in the holster. J5 on the Main-Bottom board is disconnected. The proximity sensor has failed.
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1. 2. 3. 4. 5.
The footswitch is not depressed. The footswitch hose is not connected to the rear of the UC. The footswitch hose was attached while being depressed. J9 on the Main-Bottom board is disconnected. A wire is broken or the pressure microswitch has failed.
System Stuck in Cooling or Tip Doesn't Get Cold Coolant level low, J12 on Main-Bottom board not connected, (one of the) low voltage power supplies has failed, Thermo-Electric Controller not properly set-up or has failed, J4 on the Main-Bottom board not connected, TEC in handpiece has failed, J14 on the Main-Bottom board not connected, or check below. 1. Check on the temperature on the main heat exchanger controller. Check to see if it is set to 19° C. If the controller is blank check to see if there is any power by checking (J3 pin 2): 12V. If it is not 12V there may be something wrong with the board, and it may need replacing. If the controller indicates a "fail input", check the connections, there may be a wire loose or broken. Turn off the system and fix the problem and restart the system. Check on the Epi Temperature controller. Check to see if it is set to 4 degrees C (This is for software V0.19. Any version prior to that would have a setting of 8 degrees C). If the controller is blank, check to see if there is any power by checking (J4 pin 3,4) both should be 12V. If the controller indicates a "fail input", check the connections, there may be a wire loose or broken. Turn off the system and fix the problem and restart the system. If both controllers are fine, but the Epi controller reads extremely high or low temperature (greater then 30 degrees C), check the resistance between (J16 pin 1 & 2). It should read approximately 114 ohms.
2.
3.
4.
5.
6.
7.
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LIGHTSheerTM Service Manual 8. At the same time, wiggle the hand piece and check the resistance on the meter. If the resistance fluctuates widely, there may be a short in the umbilical or a connector problem inside the handpiece. This can cause the controller to think that the "ChillTip" is too hot.
4.6 Operational Problems Calibration Check Sum. 1. The software has been corrupted by a possible improper shutdown or a separation and reconnection of the of the upper and lower consoles while the system is still on. Reload new software on to the system and re-enter the calibration coefficient in the [S]et up screen.
2.
Multiple Errors While Performing Calibration 1. This may occur if one or more of boards are not plugged in or if there are loose connections. Connect any loose wires or cables and restart the system. Most if not all of the error messages should go away.
2.
Over Current A/B, Over Charge A/B, Over Power A/B or Over Voltage A/B (while performing Calibration) If it is determined that the diamond board and/or its connections are fine, check the following: 1. Turn off the system and check all the screws on the FET board to see if they are tight, if they are loose tighten them. Check to see if there are any loose or broken wire(s) which may be shorting to ground. Fix any obvious problems and restart the system. If the problem persists... Go into Service mode and touch [D] to get into the diagnostic screen. Check the FET board using a Voltmeter. Hook the black clip of the meter to (TP7). Turn on the key switch and with the red lead, touch the fuse (F1) on both sides. It should read (-112V). If it does not, the fuse is bad and needs to be replaced.
2. 3.
4.
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LIGHTSheerTM Service Manual 5. If the fuse is good, turn on the high voltage bit and touch the red lead to (Q10). It should read (-112V) also. If the above tests are good, move the black clip to (TP8). With the red LEAD, test the (U4 - pin 4), (U4 - pin 11), and (U13 pin 8), they should read, +12V, 12V, and + 5V respectively. If one or all of these tests fails, the board may need to be replaced. Take the FET board off and test the FET itself. The resistance between the top of the FET and the bottom should be infinite. Check all the FETs, replace any that are bad, and put the FET board back on and restart the system. Check to see if the MAIN BOTTOM board is getting the power it needs. Using a Voltmeter, attach the negative LEAD to (TP3) on the MAIN TOP board, then measure the following dc voltages: (J10 pin 2) : 12V (J10 pin 3) : -12V (J10 pin 4) : 12V (J10 pin 6) : 5V (J10 pin 8) : 12V 11. If you do not get the above reading, there is a problem with the connection between the lower and upper console. Fix the problem and restart the system.
6. 7.
8. 9.
10.
4.7 Handpiece Problems Sapphire Tip Fractured Review Pre-Op procedures (shave patient immediately prior to treatment). Clean tip frequently. Don't drop the handpiece (use the wrist strap). Replace the handpiece/umbilical assembly.
Trigger Switch Doesn't Work Trigger switch in handpiece broken or disconnected. 1. Confidential
12-01000-00.AA CO #98-0620
Check for continuity on the leads at the J14connector (J16 on systems without the electronic shutter) on Main-Bottom board. 4-8: Troubleshooting Preliminary
STAR MEDICAL TECHNOLOGIES
LIGHTSheerTM Service Manual
2.
A damaged trigger or trigger switch will require the replacement of the hand piece/umbilical assembly.
Shutter Not Moving/Moving Too Slow (Mechanical Shutter Only) Shutter mechanism damaged or broken, shutter motor not connected, J14 (J16 on systems without the electronic shutter) on Main-Bottom board not connected. 1. The shutter may have failed to open. To test this, restart the system and go through the calibration procedure, but when pressing the foot switch, hold it for 1 second, release and immediately press it again. You may have to repeat this step several times then hold the foot switch down. If this works and the system allows you to finish calibrating, there is a problem with the shutter. It is taking too long to open. The shutter may fail to close. The system may allow you to calibrate, but when you are finished, and released the foot switch, it will give you a system fault. This may also occur while the authorized user is treating a patient. Ask the authori