On the printer's LCD screen, Does it display a large "S"?
A. If Yes, that means that the printer is not detecting an IP-Enabled RFID Tag: i5100 & IP Series - What is IP-enabled Material? Even if the label stock is not IP-Enabled, the printer can still print labels correctly if the printer's sensor settings are configured as needed for their label materials: How to Configure Correct Sensor Settings on IP Series Printers.
B. If No, it instead shows the label part number currently loaded in the printer
If the printer has firmware version 3.28 or below. IP Series - How do you check the current firmware version on the printer
Look inside the cardboard core of your roll of labels. Does it have a very shiny white label with nothing on it (it actually contains a wire in it), that is the IP-Enabled RFID Tag that tells the printer what labels are loaded, what sensor the printer needs to use to calibrate, the size of the labels, their default orientation and what print temperature to use.
Important: The printer will default to the Gap sensor on printer firmware versions above 3.28.
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RFID functionality is required to use notched or bottom-reflect labels in the IP printer. In Standard Mode, the IP printer will only use the Gap Sensor. This means that any notched, bottom-reflect or continuous labels will not calibrate correctly. To resolve this, you will need to revert the printer to firmware version 3.28 (attached)
The daughter board that controls the RFID bidirectional communication may have gone bad, the symptom of this would be that the both the labels and ribbon cannot be detected. The printer is obsolete and no longer repaired: Obsolete Brady Printers - No longer supported or repaired.