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421D
Users Manual
Appendix
Message codes
All message codes are displayed with either or "Error".
The following errors can be corrected:
Cause
Transverse tilt
156
greater than 10°
Main tilt direction,
160
angle too high
(>45°)
Calculation error
204
Temperature too
252
high
Temperature too
253
low
Receiver signal
255
too weak,
measurement
time too long,
distance >100 m
Received signal
256
too strong
22
Remedy
Hold the instrument
without any
transverse Tilt
Measure angle up to
max. ±45°
Repeat procedure
Cool down instrument
Warm up instrument
Use target plate
Target too reflective
(use target plate)
Wrong
257
measurement,
background
brightness too
high
Laser beam
260
interrupted
Error
Cause
Error
Hardware error
Darken target
(measure in different
lighting conditions)
Repeat measurement
Remedy
Switch on/off the
device several
times. If the symbol
still appears, then
your instrument is
defective. Please
call your dealer for
assistance.
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