|Common Issues - Not printer specific:||Click on the image for a larger picture:|
Scanners can not detect red, so red looks like white; a space not a bar.
Although metallic surfaces look shiny, they look black to a scanner so they must be used for bars, not spaces.
Training associates about bar code applications can go a long way to prevent problems.
Scanners require quiet zones for successful decoding.
|The loss of the quiet zones on the left is most likely due to poor alignment of the label stock in the printer.|
|Thermal and Thermal Transfer Printers:|
|Some pins in the print head are not functioning (see the white lines in the numbers and letters.) This causes the bars in the bar code to be too narrow. Bars and spaces that have incorrect widths cause the bar code to be undecodable.|
|Heat settings can cause bars to become to big, called bar width growth, or too narrow, called bar width loss. Either problem may cause the bar code to be undecodable.|
|Dot Matrix Printers:|
|Bar codes created with Dot Matrix printers have a tendency to lose contrast as the ribbon in the printer loses ink.|