Craftsman CMHT77630 Instructions Manual

11EChecking Laser AccuracyThe laser tools are sealed and calibrated at the factory.It is recommended that you perform an accuracy checkprior to using the laser for the first time (in case thelaser was exposed to extreme temperatures) and thenregularly to ensure the accuracy of your work. Whenperforming any of the accuracy checks listed in thismanual, follow these guidelines:• Use the largest area/distance possible, closest to theoperating distance. The greater the area/distance, theeasier to measure the accuracy of the laser.• Place the laser on a smooth, flat, stable surface thatis level in both directions.• Mark the center of the laser beam.Horizontal Beam - Scan DirectionChecking the horizontal scan calibration of the laserrequires two walls at least 30’ (9m) apart. It is importantto conduct a calibration check using a distance noshorter than the distance of the applications for whichthe tool will be used.1. Place the back of the laser against a wall and facingstraight ahead toward the opposing wall (Figure D 1 ).2. Move the Power/Transport Lock switch to the right(Figure A 3 ) to turn the laser ON in self-levelingmode and display the horizontal and vertical beams.3. Turn the laser 45º counter-clockwise so that theright-most end of the laser line is displayed on thewall.4. Mark a on the center of the beam on the wall.5. Turn the laser 90º clockwise so that the left-mostend of the laser line is displayed near a (Figure D2 ).6. Mark b on the center of the beam on the wall.7. Measure the vertical distance between a and b .8. If your measurement is greater than the AllowableDistance Between a and b for the correspondingDistance Between Walls in the following table, thelaser must be serviced at an authorized servicecenter.DistanceBetween WallsAllowable DistanceBetween a and b30’ (9m) 15/32” (12mm)40’ (12m) 9/16” (14.4mm)50’ (15m) 23/32” (18mm)Horizontal Beam - Pitch DirectionChecking the horizontal pitch calibration of thelaser requires a single wall at least 30’ (9m) long.It is important to conduct a calibration check usinga distance no shorter than the distance of theapplications for which the tool will be used.1. Place the laser against the end of the wall (Figure E1 ).2. Move the Power/Transport Lock switch to the right(Figure A 3 ) to turn the laser ON in self-levelingmode and display the horizontal and vertical beams.3. At least 30’ (9m) apart along the laser beam, marka and b .4. Move the laser to the opposite end of the wall(Figure E 2 ).5. Position the laser toward the first end of the samewall and parallel to the adjacent wall.6. Adjust the height of the laser so the center of thebeam is aligned with b .7. Directly above or below a , mark c along the laserbeam (Figure E 3 ).8. Measure the distance between a and c .