How to Fix Faint Black Print Issues on Xerox DocuPrint C1190FS?

It sounds like you're experiencing an issue with your Xerox Docuprint C1190FS where the black text is printing very faintly, even though color prints are coming out fine. Since you've already replaced the black print cartridge and confirmed that you have the latest print driver installed, we might need to consider a few other factors. First, it's important to check if you're using genuine Fuji/Xerox printer cartridges, as third-party cartridges can sometimes lead to printing issues. If you haven't done so already, try running a print quality diagnostic test from the printer's settings. This can help identify if there's a problem with the print head or if the black ink is not being applied correctly. Another thing to consider is the transfer unit, which is a component that helps transfer the toner onto the paper. If this unit hasn’t been replaced in a while, it could be contributing to the faint printing. If you're unsure about the status of the transfer unit, it might be worth checking your printer's manual or contacting support for guidance on how to inspect or replace it. Since the issue started about a week ago and there haven't been any recent system updates or changes in paper type, it could indicate a hardware failure. If the diagnostic tests don’t resolve the issue, I recommend reaching out to an authorized repair center. They can provide a more thorough examination and let you know about any potential repair costs or solutions that might not be available outside of their service.