Download this manual at
www.johnsonlevel.com/manuals
40-6780
40-6780 Line Laser Detector Operator’s Manual
INSERTING BATTERIES
Thank you for purchasing this Johnson line laser detector, model
40-6780. This detector is the fastest way to locate red beam line
laser signals in bright locations or over long distances where it’s
dicult to see the laser beam with the naked eye.
This laser detector features:
• LCD display
• LED indication of beam position
• Audio indicator with volume control
• Auto-o timer
• Grade rod clamp
• Dust and rain resistant construction
High accuracy:
• 0.019” from 0’ to 50’
• 0.039” from 50’ to 100’
• 0.059” > 100’
1. Remove the battery cover by
depressing the retaining tab on the
bottom edge of the battery door
and lifting the cover o.
2. Insert a 9V battery following the
indicated polarity printed inside of
the battery compartment.
3. Replace the battery cover and,
if desired, replace the grade
rod clamp.
INTERPRETING THE LCD DISPLAY
GETTING STARTED
1. Ensure the line laser you are using has a pulse mode operation;
otherwise it will not be detectable. See your laser’s operator’s
manual for details. Not all line lasers are compatible with laser
detectors.
2. Insert the included 9V battery. See “INSERTING BATTERIES.”
3. Attach the detector to the included clamp (if using a grade rod)
or remove the clamp if using the detector on a standalone basis.
4. Press to turn on the detector.
5. Enable or disable the audio indicator by pressing .
6. Operate the detector. See “USING THE DETECTOR.”
7. When you are finished using the detector, power it o by
pressing . This detector will also automatically power o
after 6 minutes of inactivity (no buttons pressed or laser signals
received).
NOTE: If the detector battery is low, the low battery indicator will
flash to indicate the battery should be replaced soon.
1. POWER ICON - Indicates the detector is on
and ready to receive laser signals.
2. LOW BATTERY INDICATOR - Indicates the
battery needs to be replaced.
3. Used on select models only. This indicator is
always illuminated on this model.
4. AUDIO - Indicates sound is enabled.
5. BEAM LOCATION INDICATOR - Indicates the
direction to move the detector to find the
laser beam. See “USING THE DETECTOR”.
