Johnson Level & Tool Mfg. 40-6770 User Manual

Page 5

2. Fine detection

1. power symbol
2. fine detection symbol

• Press coarse/fine detection button. The

detector is ready for fine detection.

• Move the detector slightly up and

down like the coarse detection
procedure.

• When the detector displays as shown

in the figure, it is level with the laser
beam.

• Tighten the adjusting bolt and mark the position on the grade rod

next to the rabbet. This mark will be the horizontal reference in the
fine detection.

(e) Sound function
• If the detector is working in a situation where it is difficult to use

the display function, the sound function can be used instead.

• Press the sound function button. The sound symbol is displayed

and the detector is ready for sound function. The detector then
conducts detection through sound (horn) signals.

• When the sound signal is a short sound, move the detector slightly

upwards.

• When the instrument makes a rapid sound, move it slightly downwards.
• When the instrument makes a continuous sound, it is level with

the laser beam.

• If there is no sound heard, the detector is not receiving the laser

signal.

3708H_Manuals 7/20/10 11:27 AM Page 5