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DG511/711 Troubleshooting 8
DG711 and DG511 Pipe Laser User Guide 73
Grade does
not respond
to grade
control
Grade will
not change
Grade-lock indicator
(status display).
Unlock grade.
Laser beam
is high or
low
Doesn’t
match
existing
pipe
Grade, elevation, or
line is incorrect on
existing pipe.
Use a known accurate
instrument to check
existing pipe.
Unstable setup. Provide more stable
setup.
Check refraction. Use a blower or other
method to stabilize air
temperature in pipe.
Calibration. Calibrate the laser.
Table 8.1 Troubleshooting (Continued)
Problem Symptom Inspect Solution