Printer Stripe S-500 Zebra
Question, when the printer prints is there an image of the data on the ribbon when it spools onto the ribbon takeup spool? If so, the ribbon may be installed backwards. I'm sure you know what you are doing but one must check even the smallest detail when trying to solve these strange problems. If the ribbon is installed correctly and there is no image of the data on the ribbon you may be dealing with a bad printhead and the printhead needs to be replaced.