Troubleshooting
8 min read
Barcode Scanner Scanning Twice? Diagnose Duplicate Reads
Isolate scanner rereads, duplicate host events, and POS handling before resetting a barcode scanner that enters the same item twice.
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Troubleshooting
8 min read
Barcode Scanner Beeps but Sends No Data: Safe Fixes
Use one safe control scan to isolate connection, host-interface, and application failures before resetting or replacing a barcode scanner.
Troubleshooting
9 min read
Barcode Scanner Won’t Scan Phone Screens: Safe Fixes
Use a paper control code to separate scanner capability, phone presentation, and POS data-path problems before resetting or replacing hardware.
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Troubleshooting
Barcode Scanner Scanning Twice? Diagnose Duplicate Reads
Isolate scanner rereads, duplicate host events, and POS handling before resetting a barcode scanner that enters the same item twice.
Troubleshooting
Barcode Scanner Beeps but Sends No Data: Safe Fixes
Use one safe control scan to isolate connection, host-interface, and application failures before resetting or replacing a barcode scanner.
Troubleshooting
Barcode Scanner Won’t Scan Phone Screens: Safe Fixes
Use a paper control code to separate scanner capability, phone presentation, and POS data-path problems before resetting or replacing hardware.
Troubleshooting
Receipt Printer Printing Gibberish? Diagnose the Data Path
Use a self-test-first sequence to isolate random receipt output across the printer, driver, POS profile, connection, and encoding.
Troubleshooting
Square Cash Drawer Not Opening: Diagnose the Fault
Separate mechanical, USB, printer-driven, and profile failures before resetting Square hardware or replacing a working cash drawer.
Troubleshooting
Barcode Scanner Scanning Wrong Characters: Safe Fixes
Use one controlled scan to isolate keyboard layout, prefixes, interface mode, timing, and catalog formatting before resetting the scanner.
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