Denso BHT-1400-CE Series Hardware User Manual page 39

BHT-1400-CE Series
When unable to successfully read codes...
Specular
reflection
Distance from
code
Curved
surface
Code surface
dirt
Code reading
window dirt
Direct
sunlight,
ambient light
30
Cause
The BHT may not read a code due to
specular reflection when the
illumination light is pointed vertically
at a code on the printed surface.
The BHT may not read a code if the
reading window is too close to or too
far from the code.
The BHT may not read a code if the
code surface is curved.
The BHT may not read a code if the
code surface is dirty.
The BHT may not read a code if the
code reading window is dirty.
The BHT may not read a code in
direct sunlight or under high ambient
light.
Countermeasure
Change the BHT reading angle and try again.
Move the BHT slowly toward or away from the
code and try again. The illumination light is
only a guideline.
Readable area is approx. 7 x 3.5cm at reading
distance of 10cm from the reading window.
Flatten the label surface and read it again.
Wipe the dirt from the code and try again.
Blow any dust away with an airbrush, and then
gently wipe the reading window with a cotton swab
or similar soft object.
Read the code away from direct sunlight. Adjust the
brightness of the surrounding light when reading
indoors.