Sharp XE-A507 cash register, was working fine all morning. I can manually enter items and operate the register, but I can no longer use the scanner!
Unplug the scanner, then power it on again. If it reads once and then stops, it is a configuration error such as bad cable or wrong settings in register. If it doesn't read straight after power up, try scanning the 'start' barcode in the scanner's programming manual. It should always be able to read this code. If it reads it, you have a setting fault in the scanner and you need to re-program it to read UPC and EAN codes again. If it reads none of the above codes after power up, have it checked by a dealer
SOURCE: cash register scanner
Here is a link for the Cash Register and tells how to program it.
I suspect the you plugged the unit in after the cash register was under power.
unplug the register and reinitialize it with the scanner plugged in so it will actually see it.
Then try using it again
http://www.sharpusa.com/files/cas_man_XEA505.pdf
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SOURCE: plugged in barcode scanner. it blinks continously. won't scan
You might try turning the register off, confirming the scanner is pluged in and the screws tight then turning the register back on. You might also chek that none of the pins on the scanner plug have been bend.
SOURCE: Deleting UPC codes
Hello there,
To delete UPC codes, please refer to this portion of your manual. 
Hope this answers your problem. Goodluck!
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