I have a client with a printer. Suddenly the printer has begun printing garbage characters on some of the pages. See the attached image for a part of a page that was printed with garbage characters on it. It is a HP LaserJet 4000 printer, using the PCL 5 downloaded from HP's website. I've tried replacing the printer driver with newer / different ones from HP's website, but have had no luck.
I'd appreciate any assistance. Thank you.