GentleLASE PRO Focus Lens Replacement Procedure
WARNING – SHOCK HAZARD!!!
The high voltage capacitor in the GentleLASE PRO laser retains LETHAL voltages and must be safely discharged, before working near the laser head or inside the HV section for any reason. This procedure must be performed only by those technicians who are familiar with the precautions required when working with high voltage specific to the GL PRO laser system, and those who have been trained on the GL PRO laser system and its particular hazards.
Residual voltages require stick discharging if access to the head or high voltage sections are necessary. This must be done using the discharge stick located in the HV section. Discharge all 3 capacitor terminals for several seconds each. Verify that the capacitor is discharged below 25 VDC using a DVM and a high voltage probe.
WARNING – LASER LIGHT!!!
During this procedure it is possible that the laser may perform a bleeder pulse, emitting laser radiation. Therefore safety eyewear must be worn at all times during these procedures. The eyewear must have an optical density of ≥ 5.8 at 745 – 765 NM for the Alex Head.
NOTE: Exercise extreme care. Cleanliness of optics is essential. Refer to Service Procedure for Inspection and Cleaning of Optics 8503-01-0921.
Appropriate optic handling precautions and techniques must be followed in order for the laser to operate for its maximum lifetime. Clean powder less finger cots or gloves must be worn when handling lenses and optics.
Avoid the need to clean the optics other than by gently blowing the dust off of them with filtered, compressed nitrogen or air. Lightly wipe with methanol, acetone, or isopropyl alcohol if necessary. Wipe off any dried film from the lamps with clean, dry lens tissue.
FOCUS LENS REPLACEMENT PROCEDURE:
- Turn laser on, allow for normal warm up. Remove all side panels, front panel, top cover, rail dust covers, and set aside.
- Put on safety eyewear and leave eyewear on throughout any part of this procedure when the laser is turned on.
- Record all “Before” data on the Performance and Usage Data Sheet.
- Turn the laser “OFF” and measure the HV to verify no voltage is present on the capacitor or laser head flash lamp wires. Unplug the laser from the wall receptacle.
- Remove the fiber cable assembly from the fiber receptacle.
- Disconnect the electrical connector to the beam blocker assembly and remove the hear detector and beam blocker assemblies from the laser rail and put aside.
- Disconnect the electrical cable to the mircroswitch attached to the fiber receptacle.
- Remove two screws and the fiber receptacle assembly from the laser rail.
- Remove the two jam nuts over the vertical and horizontal set screws and loosen the set screws ½ to ¾ of a turn only to back them off of the lens housing.
- Loosen the two positioning screws in the slotted holes to the focus lens housing.
- Remove the four corner screws from the rear plate. Pay careful attention to the component order and positioning when disassembling. Slide the lens housing assembly out of the receptacle.
- Removing the lens: Remove the lens housing nut by unscrewing the nut out of the housing. • Pry out the first lens with a sharp knife or tool or turn the housing upside down and tap it sharply onto a clean piece of paper on a table top to remove it. • Pry out the first o-ring. • Remove the spacer from the housing. • Push out the second lens from the back of the housing. • Pry the second o-ring out from the housing.
- Thoroughly clean the new lenses and clean or replace the o-rings if damaged, Make sure lenses are completely free of fingerprints, dust or alcohol film.
- Re-assemble in the proper orientation per drawing 7122-99-9406. • Install first o-ring using a wooden cotton applicator or plastic tool to push the o-ring into the groove inside the housing. • Install first lens using insertion tool 1301-00-8121 or a 15MM distance gauge and push down on insertion tool/gauge to properly seat the lens. (If using the 15MM distance gauge you must press down to insert lens then rotate 90 degrees and repress down again to insure lens is flat in the housing and secured by the o-ring). • Install spacer over the first lens. • Install second o-ring using a wooden cotton applicator or plastic tool to push the o-ring into the groove inside the housing. • Install second lens using insertion tool 1301-00-8121 or a 15MM distance gauge and push down on insertion tool/gauge to properly seat the lens. (If using the 15MM distance gauge you must press down to insert lens then rotate 90 degrees and repress down again to insure lens is flat in the housing and secured by the o-ring). • Screw in the lens housing nut until it stops, and check to see if nut is flush with edge of housing opening. If not then back it out one turn and check lenses for flatness and o-rings are not rolled over causing lenses to be out of alignment. Screw in the housing nut again until it is snug and check for proper assembly. DO NOT OVERTIGHTEN.
- Install the lens housing assembly into the fiber receptacle block in the orientation shown in drawing 7122-99-9407 to align diagonally with the two housing 4-40 tapped holes with the slotted holes on the rear plate.
- Hold the receptacle block vertically, fiber end facing down and lens housing end facing up. Gently push lens housing diagonally so it is resting “flat” inside the block.
- Visually inspect the centering of the lens housing inside the receptacle block. The space (gap) between the outer diameter of the lens housing and the inner diameter of the receptacle block should be even all the war around. Adjust the vertical and horizontal set screws until the space (gap) is even all the way around.
- Attach the plate in the orientation shown in drawing 7122-99-9407, onto the lens housing with two screws and tighten these two screws to snug the plate flat to the housing and back off the two screws by ½ turn each.
- Carefully rotate the plate (with housing attached) as needed, so the plates four mounting holes line up with the four threaded holes in the corners of the receptacle block. Fully tighten the screws on the plate to the block.
- Install the two jam nuts over the set screws on top and left side of receptacle (do not tighten at this time) and install the fiber receptacle assembly onto the laser rail.
- Install the head detector and beam blocker assemblies to the laser rail and connect the electrical connector to the beam blocker assembly.
- Connect the electrical cable to the micro switch attached to the fiber receptacle.
- Plug the laser into the wall receptacle.
- Perform the following alignment and calibration verification procedures, and if any additional parts were replaced, perform all required alignment and calibration procedures. See Service Manual for the following Service Procedures: 8503-01-0925 GL PRO Laser Rail Alignment Procedure • 8503-01-0918 GL PRO Performance Test Procedure
- Perform and record Performance and Usage Data Sheet “After” data requirements.
- Install all dust covers, front and side panels, chassis cover plate, and top covers.