Lets look at this logically. If printing with regular paper you get no spots, correct? If so it has to be the media you are using. Letterhead has a different texture and sometimes it is is not even made for laser printers, especially if very old. You can try to specify letterhead as the type of paper and see if that makes a difference. Also sometimes the spots you are getting are actually ink already on the letterhead coming off in the fuser and being put back on the paper latter. Have some different letterhead paper made for you from a different manufacturer.
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