User manual

English | 21
Bosch Power Tools 2 609 140 991 | (13.5.13)
The measuring tool monitors the proper function for each measurement.
When a defect is detected, all indicators on the display flash. In this case,
or when the corrective measures listed above cannot correct the error,
have your dealer forward the measuring tool to an authorised Bosch after-
sales service.
Checking the Measuring Tool
The accuracy of the measuring tool can be checked as follows:
– Select a permanently unchangeable measuring section with a length of
approx. 3 to 10 metres; its length must be precisely known (e.g. the
width of a room or a door opening). The measurement should be car-
ried out under favourable conditions, meaning, the measuring dis-
tance must be indoors and the target surface for the measurement
must be smooth and reflect well.
– Measure the distance 10 times after another.
Under favourable conditions, the deviation of the individual measure-
ments from the mean value must not exceed ±3.5 mm (max.) over the
complete measuring distance. Log the measurements, so that you can
compare their accuracy at a later point of time.
The laser beam outlet 9 or the recep-
tion lens 8 are misted up (e.g. due to a
rapid temperature change).
Wipe the laser beam outlet 9
and/or the reception lens 8 dry
using a soft cloth
The “Err” indication is displayed after pressing the “HOLD” button
Unreliable measuring result
The target surface does not reflect cor-
rectly (e.g. water, glass).
Cover off the target surface
The laser beam outlet 9 or the recep-
tion lens 8 are covered.
Make sure that the laser beam
outlet 9 or the reception lens 8
are unobstructed
Measuring result not plausible
Obstruction in path of laser beam Laser point must be completely
on target surface.
Cause Corrective Measure
OBJ_BUCH-1900-001.book Page 21 Monday, May 13, 2013 11:40 AM