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. Also, do not charge Ni-Cd batteries too often. Ni-Cd batteries
should be charged after about 20 to 24 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 750ft (230m) 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.
1
Battery Installation
Battery charging jack
For connecting battery charger
when using rechargeable batteries.
(see pg. 12 for accessory info.)
Battery door release screw
Releases with 1/4 turn counter-
clockwise.
Battery installation
Install batteries as shown here.
For reference, a diagram is
molded onto the battery holder.
!
Charge only
Ni-Cad batts.
