The is a workhorse device designed for simplicity. While the lack of a physical manual is frustrating, the information provided in this guide covers 99% of what you need to know.
| Problem | Probable Cause | Solution (From Manual) | | :--- | :--- | :--- | | Scanner does not power on | Loose cable or dead USB port | Try a different USB port. Use a powered USB hub. Check for bent pins in the connector. | | Laser turns on but won’t read | Dirty scan window or unsupported barcode | Clean the glass lens with a microfiber cloth. Scan the "Enable All Symbologies" barcode from the manual. | | Scans but outputs wrong characters | Keyboard language mismatch | The scanner is in US keyboard mode. If your OS is French or German, scan the corresponding keyboard layout barcode (found in manual’s "International" section). | | USB Serial not working | Missing driver or wrong baud rate | Install driver from CD. Set baud rate to 9600, 8 data bits, no parity, 1 stop bit in your POS software. | | Scanner beeps twice randomly | Decoding a barcode it thinks is invalid | It may be reading a reflection or shadow. Change scanning angle or distance. | nadamoo barcode scanner yhd-5100 manual