Casio DT-900 Operation Manual page 26

Using the Bar Code Reader
Beam Width Adjustment Bar Code
For down-facing reader port model
For forward-facing reader port model
[Handling Precautions]
• The Data Collector is shipped with the laser beam width already
• If adjustment is not successful, an error message is displayed. If this
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adjusted. So, the laser beam width need not be adjusted. Adjustment is
necessary only when the laser beam does not switch to the correct
position when the beam width is switched.
* Adjustment results are stored in memory.
* Factory settings are returned to if the Data Collector is reset or all
built-in batteries are removed, preventing memory backup.
happens, retry adjustment.