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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.
Lift the copy bed cover and locate the **** glass (it is about 1" wide and sits on the left of the large glass)
Use a microfiber cloth, and a bit of water, and remove the debris from this **** glass. Make sure it is clean, then clean the white bar on the underside of the top cover (It will sit on that **** glass)
take a blank piece of paper and copy it through the feeder, if you have lines on the page that prints, you need to look harder for a spec on that glass. a small dot will create a line on any document fed through the feeder. A dot on the large glass will print only the dot as the paper is not moving over it.
If the printer is printing blank pages, make sure you are using the correct printer driver and make sure the paper size is correctly selected in the driver. If the printer is printing black only, the Ink option in the printer driver may be set to Black instead of Color or a setting in the software may be set to print black only. Also, the print head nozzles may be clogged. From the Utility section found in the printer driver, clean the print heads by performing a head cleaning followed by printing a nozzle check pattern. A head cleaning and nozzle check must be performed as a cycle. After printing a nozzle check, examine the printed dot pattern. Each staggered horizontal and straight vertical line should be complete, with no gaps in the dot pattern. If there are gaps in the dot pattern, continue with another cycle. Performing up to 6 cleaning cycles is not uncommon if the print heads are severly clogged.
If the whole page is covered with stuff that's not supposed to be there, and that stuff sometimes changes shape or color on each page. then you look to the DRIVERS and connection 1st. Corrupt printer memory can also cause this.
If the corruption tends to be consistent across print jobs and it's only on certain spots on the page, you can start to look for mechanical defects.