Page 1
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”.
Page 2
Download this manual at
www.johnsonlevel.com/manuals
40-6780
USING THE DETECTOR
1. Follow the instructions in “GETTING STARTED” to prepare the
detector for use. Position the detector so the detection window
is facing the laser and nothing (including your own body) is in
between the detector and the laser.
TIP: Be cautious of laser reflections from windows and high gloss
surfaces that can cause laser reflection and erroneous signals.
2. Move the detector perpendicular to the plane of laser light until
you begin to locate the beam. The detector will beep (if sound is
enabled), and the LCD beam location indicator will appear when
the laser passes through the detection window. If you’re having
trouble finding the beam initially, make sure you are using a slow,
steady motion to move the detector and that the laser is in pulse
mode.
3. Continue to move the detector up or down until you locate
the beam. You will receive both visual cues and audio cues (if
enabled) regarding which direction to move the detector to locate
the beam:
GRADE POSITION
INDICATORS
DETECTION WINDOW
DETECTION WINDOW
LCD DISPLAY
VOLUME BUTTON
GRADE ROD (NOT INCLUDED)
MOVE UP MOVE DOWN ON GRADE
(FAST BEEP) (SLOW BEEP) (SOLID TONE)
4. Use the grade position indicators to read or mark the position of
the laser.
TIP: Use care when operating the detector in the vicinity of other
lasers - laser signals can be detected over very long ranges.
IF USING A GRADE ROD: Read the top edge of the grade
position indicator on the grade rod clamp (indicated by the blue
line in the image below). In this image of a ft/100’s (engineer’s
scale) grade rod, the grade reading would be 0.67’.
IF NOT USING A GRADE ROD:
Read grade position using the grade
position indicators on the housing of
the laser detector (shown with the
blue circles in the image to the left).
For your convenience, an indent in
the housing will help locate a pencil,
marker or other marking tool so that
you can mark the grade position
directly on your work surface.
0.67’
POWER BUTTON
GRADE ROD
CLAMP
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