There are small oval dots repeating on the sheets spaced 3-3/4" apart. The dots are neat, symmetrical ovals about 1/8" wide and 1/16" high. I suspect there is something on the drum. I cannot find directions on how to clean the drum.
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If you have random blotches on both sides of the sheet, your printer probably needs cleaning, especially in the fuser section. If the fuser is difficult to get at, here's a good cheat developed for HP LaserJet 6 printers: Use a basic graphics program such as Microsoft Paint to draw three solid black rectangles about 2.5" top to bottom, going all the way across the paper (the space in between is not critical - the key is that you go as close to edge-to-edge as you can get). Print out this sheet.
Put the sheet back in the paper tray so it will print on the blank side (usually printed side up). Open up a quick text processor (Notepad in Windows). Type a single space, then print (some text editors won't print a document with no data in it). Dirt in the fuser will get stuck to the black areas on your cleaning sheet. Test your work by printing another copy of " ". Repeat with a new cleaning sheet if necessary.
Could be that there are a mark on the drum itself or some dirt, remove the drum unit and inspect the surface , by rotating the drum , becareful not to touch the drum as it will leave marks on the surface
You need to clean your drum unit:
Worked for me!!