Denso BHT-1505B - When Unable to Successfully Read Barcodes

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Barcode Handy
When unable to successfully read Barcodes…
Cause Countermeasure
Specular
reflection
When the light
is focused on the
printed surface of the code from
directly above,
the BHT may not
read the code
due to specular
reflection.
Change the BHT reading angle and try again.
Distance from
code
The code shorter than the reading
window may not be read from a
short distance.
Move the BHT slowly away from the code and try
again.
Code surface
curvature
The code may not be read if surface
is extremely curved.
Flatten the label surface and read it again.
Code surface
dirt
The code may not be read if its
surface is dirty.
Wipe the dirt from the code and try again.
Code reading
window dirt
The code may not be read if the
code reading window is dirty.
Blow any dust away with an airbrush, and then
gently wipe the reading window with a cotton
swab or similar soft object.
Direct
sunlight,
ambient light
Code reading may be adversely
affected by direct sunlight or the
brightness of the surrounding light.
Read the code away from direct sunlight. Adjust
the brightness of the surrounding light when
reading indoors.