the user should clean the printer every six months or after 50,000 prints, hichever occurs first. if you experience paper feed problems, or if the print head carriage movement becomes restricted, cleaning should be carried out more often.
the page counter (pgcnt) in the print-test 3 will inform you about the actual number of printed pages.

the number following pm1 identifies the micro program and the number following pm3 identifies the character set.