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16
Maintenance And Troubleshooting
Calibration • There is no set interval for calibrating the L4 or L4+, but
calibration should be checked from time to time in order to ensure that the
highest possible quality of work is being done. Calibration should always be
checked if the laser has been handled roughly or shipped.
Batteries • Occasionally remove the batteries and check the contacts for
corrosion. Alkaline batteries will last far longer than carbon batteries. If you
use rechargeable batteries, be careful to never charge alkaline or carbon
batteries. The Ni-Mh batteries in the optional factory kit will need to be
charged after about 50 to 55 hours of operation.
Never run the laser from
the charger unless there are rechargeable batteries installed. Keep a spare
set of batteries in the carrying case to avoid down time.
Laser output windows • Regularly check the output windows for dust and dirt.
Dust can be removed with a camera brush or clean compressed air.
Control panel and exterior • Clean the control panel and the other exterior
surfaces of the laser with a soft damp cloth.
Caution • Never store the laser in a carrying case that is wet inside. Moisture
can get inside the laser this way. Should this happen, remove the battery
cover and place the laser in a warm area until it is completely dry.
Troubleshooting
The laser will not operate, there is no obvious damage • If the low battery
indicator is on, or you suspect the batteries may be dead, replace the
batteries. Check the battery contacts to be sure that they are clean.
The receiver shows an on-grade at two different heights • Check the jobsite
for windows or mirrored surfaces that might be reflecting the laser and
causing the other reading. Check for others on the site using a rotary laser.
The laser was knocked over • Visually check the optics for damage. Inspect
the laser for any other physical damage. Use the receiver to check that the
laser is transmitting. Check the calibration and adjust as needed. Check to
see that the laser displays the "limit" light when the circular level vial bubble
moves approximately half way outside the circle.
The laser only works at short distances • Check the output windows for
heavy dust or moisture. Remove dust with a camera brush or blow off gently
with clean compressed air. Allow moisture to dry.
The receiver does not indicate "on grade" at long distance • Be sure you are
within the max distance specification from the laser. Check the windows that
surround the rotating mirror on the laser for dust or moisture. Remove dust
with a camera brush or blow off gently with clean compressed air. Allow
moisture to dry.
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