Printing issues
Printing issues
When you don't use the correct materials, the issue arises. Toner isn't compatible with every printer. I'm sure the right OEM products would resolve the problem.
This appears to be a broader printer malfunction. Inside the printer, small amounts of specific toners have accumulated and are falling onto the paper during operation. Can you confirm whether the "blue dots" are present on the sheet? Are they scattered randomly or consistently in the same spots? Uniform distribution would suggest buildup on a fixed component, while random placement implies the debris is on a moving part like rollers. Try to locate a method to clear the paper path.
Incidentally, laser printers use a very fine "dot" of a thermal plastic of a specific size, and they melt that plastic dot into the paper. The part which melts it is called the "fuser". It isn't unusual that fusers need cleaning (basically, a complicated way to agree with
@Paperdoc
). Be careful though since if this printer has been plugged in recently, then the fuser might be rather hot.
Also, there is a place to catch unused toner which more or less falls off as a waste product each print. That tray might have filled, so check your maintenance docs for your particular printer for both fuser cleaning and for any waste dump.