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OPERATION

CHECKS AND ADJUSTMENTS

[2. Setting slope]

Operating procedure 

(Setting slope)

Key 

operation

Lamp display 

(Refer to the right illustration)

1

Press 

Power switch

 ON. 

You can set the slope after self-leveling is 

completed.

Power switch

During self-leveling: Lamp B blinks.

After self-leveling is completed.: Lamp B lights.

2

Press one of 

Slope keys

 once. The laser 

beam keeps sloping in the direction of the 
pressed key.

After self-leveling 
is completed.

Slope key

Lamp E blinks quickly.

3

Press the 

Slope key

 again. The laser beam 

stops sloping.
(Unless you press the Slope key again, the 
laser beam is set horizontally.)

Slope key

Lamp E lights.

4

Press the 

Slope key

 to adjust the slope. 

How long you press the 

Slope key

 can 

change the laser beam sloping speed. The 
blinking speed of the lamp provides a visual 
indication of the beam movement speed. 

Slope key

When Slope key is not pressed: Lamp E lights.

 

           Slope key                  Lamp E            Beam movement

Press for a shorter time

   

 Blinks slowly          Moves slowly

                  

                                  

                                

Press for a longer time    Blinks quickly         Moves quickly

5

Press 

Power switch

 OFF to cancel the 

slope setting.

Power switch

All lamps are OFF.

How To Operate

1

Set the instrument to the tripod or 
smooth surface. Make sure 
instrument is roughly level.

2

Press power switch (ON).

3

Press power switch on level 
sensor (ON).

4

Select the precision mode by 
pressing the On-Grade 
precision switch.

5

Locate the on-grade position 
“---” by moving the level 
sensor up and down.

6

Mark the position of On-Grade index. 
(Top of the level sensor is 40mm [1 9/16”] 
from index for offset marking.)

LS-80L Indicator

Detective Range

Height Alert Function

When the instrument system detects a shock, this function informs the 
operator of it.

• When the instrument’s installation status (height) is sharply changed 

by the contact of the operator or the like, this function stops self-
leveling to keep the operation accuracy and informs the operator of the 
situation. The three lamps blink at the same time as shown at the right.

• After 1 minute has passed since the self-leveling function was 

activated and the laser beam was emitted, this function works.

• The height alert function does not work in the “Manual” mode.

Shock is given to the instrument.

The three lamps blink at the same time 
and the rotary head rotates at low speed.

Height alert status

[How to reset]

1

Turn off the power switch.

2

Check whether the instrument is installed 
correctly.

3

Turn on the power switch. Self-leveling starts 
again. After self-leveling is finished, the laser 
beam is emitted. 

4

Make sure that the laser beam is set at the 
correct height. Then, restart the operation.

Higher than datum position
(Buzzer sound: High frequent beep sound)
Move the sensor downward.

High precision mode

Normal precision mode

Datum position
(Buzzer sound: Continuous beep sound)
Lower than datum position
(Buzzer sound: Low frequent beep sound)
Move the sensor upward.

Battery remaining display

Height alert warning of rotating laser*1

A flash and a buzzer sound signifies
that the height alert function of rotating
laser is operating.

Rotating laser battery warning*2
A flash shows that the rotating laser
power is low.

Note: The warning displays *1 and *2 are the functions that the level sensor 
detects alarm signal from the rotating laser.
The level sensor can be canceled the alarm detection from the rotating laser.
To be canceled the detection; Press the power switch while pressing the 
buzzer sound switch when powering on.

(1) Battery is sufficient.

(2) The power is low, but
      laser is still usable.

(3) Dead battery.
     Replace the dry battery 
     with new one.

Aligning Direction of Slope

It is possible to set slope only in the X axis direction (refer to “CHECKS 
AND ADJUSTMENTS”).

[1. Installation of the instrument]

When using the laser to set the slope, the laser must be properly 
aligned so the slope axis of the laser beam is parallel to the desired 
direction of slope.
The sight on top of the instrument is calibrated to the slope axis of the 
laser beam. Follow the steps below to align the laser to the desired 
direction of slope:

1

Establish a target line parallel to desired direction of slope.

2

Set up the laser over this line (drop a plumb bob from the tripod 
mounting screw).

3

Rough align the instrument to the direction of slope. Make sure it is 
properly oriented for the slope to be set.

4

Using the sight, position the instrument so the sight is centered on 
the target. (see illustration below)

Lamp Position

• When you set the “Manual” mode to ON after setting 

the slope, the beam is fixed at the set slope position.
At this time the Slope key does not function.
For information about Manual mode ON/OFF, refer to 
“NOMENCLATURE AND FUNCTIONS”.

• Check the beam often during slope use for slope 

accuracy. Check instrument calibration periodically.

X1

X2

Y1

Checking and adjusting calibration

Checking cone error

Horizontal calibration of the laser beam can be checked by the user.

[Checking]

1

Set up a tripod approx. 50m (160ft) from a wall. Mount the 
instrument on the tripod, facing the X1 side toward the wall.

2

Turn the instrument on and allow self-leveling to complete.

3

Put the level sensor in fine detection mode by pressing the On-
Grade precision switch.

4

By using the level sensor, mark the center position of laser beam 
on the wall. (X1)

5

Turn off the instrument.
Loosen the tripod screw, rotate the instrument 180 degrees and 
re-secure it on the tripod. The X2 side of the instrument faces 
toward the wall.
When rotating the instrument, avoid changing the height.

6

Turn the unit on again and allow self-leveling to complete.

7

By using the level sensor, mark the center position of laser beam 
on the wall. (X2)

8

If the difference value of marked two laser beam heights 
(difference value of X1 and X2) are less than 5mm, adjustments 
are not needed.
The difference value is greater than 5mm, adjust the instrument 
as described in right.*

9

Check the Y side as the same way.

To discontinue calibration the instrument, press the Power switch.

Perform the following check after completing horizontal calibration procedure.

[Checking]

1

Set up the laser centered between two walls approximately 40m (131ft) apart. Orient the instrument so one axis, either X or Y, is facing the walls.

2

Locate and mark the position of the rotating laser beam on both walls using the level sensor.

3

Turn off the instrument and move the instrument closer to wall A (1m to 2m /3 ft to 6 ft). Do not change the axis orientation of the instrument. Turn the instrument on.

4

Again locate and mark the position of the rotating laser beam on both walls using the level sensor.

5

Measure the distance between the first and second marks on each wall. If the difference between each set of marks is less than 4mm (5/32 of an inch), no error exists.

* If the difference value is greater than 4mm (5/32 inch), contact your local dealer. 

Approx. 50m

level sensor

Wall

X1

X2

X1

X2 Laser beam

X1 Laser beam

Approx. 50m

* If the difference value is greater than 40mm (±90”), it exceeds the 

adjustment range. Please contact your local dealer.

Wall A

Wall B Wall A

Wall B

Approx. 40m

Control panel

Handle

Datum 
position

Cone error

Use the table below to determine operation errors indicated by blinking lamps on the control panel. 

(For the lamp indication, refer to “Lamp position”.)

If corrective action listed does not correct error, please contact your local dealer.

Lamp Indication

Error Code

Corrective Action

Lamp B, C and D blink in turn Self-leveling range error Correct tilt of the instrument until it less than 5 degrees.
Lamp A lights

Battery power error

Replace the four alkaline dry cell batteries with new ones 
at a time or charge the battery pack.

Lamp B, C and D blink 
simultaneously

Height alert error

Turn power off, rough level the instrument, then turn 
power on again. Check height of laser beam as it may 
have changed.

Lamp D blinks quickly

Calibration error

Repeat calibration procedure. If error repeats contact 
your local dealer.

Lamp E lights
Lamp B, C and D blink in turn

Checking and adjusting 
calibration error

Push the slope key of the opposite side, and align slope.

Lamp A, B, C and D blink 
simultaneously

Internal error

Turn power off, then on again in stable locations. If error 
repeats contact your local dealer.

RL-H5A

Laser source:

Laser diode (Visible, 635 nm)
CDRH (FDA) Class IIIa, IEC Class 3R

Laser output:

2.4 mW

Self-leveling range:

±5°

Accuracy:

±10”

Manual slope settable range:

±5° (When the instrument is installed on the 0° surface)
The slope range is increased or decreased 
according to the tilt of the surface on which the 
instrument is installed.

Rotational speeds:

600 r.p.m

Operating range:

Diameter Approx. 2 to 800 m (When using LS-80L)

Power source/Operating time at 20°C (68°F):

4xD size dry cell batteries (alkaline) /100 hours
Ni-MH battery pack BT-79Q (7000mAh) /60 hours

Charging time:

about 13 hours (Using with AD-17B/C/D/E)

Charging temperature range: 10 to 40°C (50 to 104°F)
Dust and water resistance:

IP66 (IEC60529: 2001)

Operating temperature:

-20 to 50°C (-4 to 122°F)

Storable temperature range:

-30 to 60°C (-22 to 140°F)

Remote warning display:

RL-H5A height alert warning(Warning is displayed 
on the indicator of LS-80L.)
RL-H5A battery warning (Warning is displayed on 
the indicator of LS-80L.)

Size:

172 (L) x 211 (W) x 205 (H) mm

Laser beam height:

171.8 mm (Height from the instrument’s bottom 
surface to the center point of laser beam)

Weight
   Dry battery type:

2.3 kg (5.1 lbs) (with dry cell batteries)

   Rechargeable battery type: 2.5 kg (5.5 lbs) (with BT-79Q)
Tripod screw:

5”/8X11 threads for surveying instrument

If the height alert OFF lamp blinks quickly and the power is not automatically turned off when pressing the height alert OFF key to
memorize the height, the height exceeds the adjustment range. Please contact your local dealer.

[To calibrate the X axis]

1

Face the X1 side of the instrument toward a wall, press the Power switch while pressing the height alert OFF key. Then the 
height alert OFF lamp will light, and manual mode ON lamp will blink. (X axis is selected.)

2

Press the height alert OFF key to calibrate the X axis. The manual mode ON lamp will light. When self-leveling finishes, the 
laser beam will emit.

3

Using the level sensor, mark the on-grade height of laser beam on a wall.

4

Rotate the instrument 180 degrees to face X2 side toward a wall.

5

In the same way as step 

3

, mark the on-grade height of laser beam on a wall.

6

Press the slope key to make adjustment so that the laser beam height may be at the center between the positions of Step 

3

 and Step 

5

7

Press the height alert OFF key to memorize the new laser beam calibration. The height alert OFF lamp will blink. Power will 
shut off automatically when the calibration memorization is complete.
The X axis adjustment is completed now.

[To calibrate the Y axis]

1

Face the Y1 side of the instrument (Control panel side) toward a wall, press the Power switch while pressing the height alert 
OFF key. Then the height alert OFF lamp will light, and manual mode ON lamp will blink. (X axis is selected.)

2

Press the right Slope key once again. The self-leveling lamp will blink. (Y axis is selected.)

3

Press the height alert OFF key to calibrate the Y axis. The self-leveling lamp will light.

4

Using the level sensor, mark the on-grade height of laser beam on a wall.

5

Rotate the instrument 180 degrees to face Y2 side toward a wall.

6

In the same way as step 

4

, mark the on-grade height of laser beam on a wall.

7

Press the slope key to make adjustment so that the laser beam height may be at the center between the positions of Step 

4

 and Step 

6

.

8

Press the height alert OFF key to memorize the new laser beam calibration. The height alert OFF lamp will blink. Power will 
shut off automatically when the calibration memorization is complete.
The Y axis adjustment is completed now.

How to set the slope before the power is OFF again

1

To set the slope before the power is OFF again, turn on 
the 

Power switch

 as pressing either right or left of the 

Slope keys

. The slope is kept and you can adjust the 

slope in the same way as Step 4.
(When the 

Power switch

 is ON without the 

Slope key

 

pressed, the laser beam will return to level.)

Target

ERROR CODE

© 

2017 TOPCON CORPORATION

ALL RIGHTS RESERVED

BT-79Q (Ni-MH rechargeable battery)
Nominal voltage:

4.8V

Capacity:

7,000mAh

Size:

104(W) x 127(D) x 37(H) mm

Weight:

690 g

AD-17B/C/D/E
Input voltage:

100 to 240 V AC, 50 to 60 Hz, 0.6 A

Output voltage:

DC 9 V/2.0 MAX 18 W

Charging time:

about 13 hours

Charging temperature range: 10 to 40°C (50 to 104°F)
Storage temperature range:

 -20 to 70°C (-4 to 158°F)

Size (excluding cable)/ Weight

AD-17B:

45(W) x 83(D) x 54(H) mm /133 g

AD-17C:

45(W) x 83(D) x 70(H) mm /137 g

AD-17D:

45(W) x 83(D) x 59(H) mm /135 g

AD-17E:

45(W) x 83(D) x 62(H) mm /140 g

SPECIFICATIONS

LS-80L

Beam detection width:

50 mm (2.0 in)

On-Grade precision:

High: ±1 mm (±0.04 in)
Normal: ±2 mm (±0.08 in)

Beam detection indication:

Liquid crystal (both sides) and buzzer

Power source:

2xAA size dry cell batteries

Operating time (at 20°C):

about 120 hours (Using alkaline 
manganese dry cell batteries)

Automatic shutoff:

after 30 minutes (without beam 
detection)

Dust and water resistance:

IP66 (IEC60529: 2001)

Operating temperature:

-20 to 50°C (-4 to 122°F)

Storage temperature:

-30 to 60°C (-22 to 140°F)

Size:

146(L)x76(W)x26(H) mm 

Weight:

0.19 kg (0.41 lbs) (with dry cell batteries)

A: Battery power
     lamp

B: Power lamp /
    Self-leveling lamp

C: Manual mode ON
     lamp

E: Slope lamp

Slope key

Power switch

Manual mode ON key

Height alert
OFF key

D: Height alert OFF
     lamp

http://www.topcon.co.jp

GLOBAL GATEWAY  http://global.topcon.com/

Please see the following website for contact addresses.

Laser point of X1

Y2

Laser point of X2

• After setting the slope, the self-leveling does not function in the X axis direction.

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