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I get an Error 16 Toner low signal, what do I do?

• Toner cartridge is low on toner. Try gently rocking the cartridge to redistribute the toner. This will buy you 50-100 pages. Get a new cartridge as soon as possible. • Dirty or misaligned contacts on the high voltage power supply. • On the HP II/III printers it can be a loose connector on DC controller see tweaking for instructions on how to repair it. • On the HP 4/4+/5 printers there is a potentiometer adjustment on the left side of the printer. You have to remove the left panel and you'll see it. It's located at about the exact center of the printer.