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I spent a while troubleshooting a similar issue on my 2400W. It turned out to be the SL2 registration solenoid, which failed to engage properly. The purpose of SL2 is to stop the page temporarily until it lines up with the image on the transfer belt. Unfortunately, SL2 is very finicky, the foam pad that stops the lever flattened too much and got sticky, so the lever wouldn't engage anymore, and the paper went straight through instead of pausing briefly when using B&W mode driver, resulting in the shifted image. In color mode, I got no image, just a "paper jam at transfer roller" error message, even though the paper came out empty without jamming. I had to adjust SL2 a few times to get it to work optimally, i.e. with minimal travel and maximal holding force. Then everything worked well again.
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.
If you're getting spots on the prints, run the Remove Ink Smears routine in the maintenance. It will clear the ink from the preheater. User packing tape to pull dust off of pick rollers. It's easy to unclip the unit and roll it on a piece of tape to remove dust.
If anyone can use a custom web site, I can really use the work. I left work a couple of years ago to be a stay-at-home dad and to try to start up a web site business. Things started out okay. But the economy soured, all of my business dried up, and now I can't find full time employment.
pleas check transfer belt, and drum unit, probably these lines are
caused by drum unit and you have to change it. also you can clean laser
glass, what is under the drum unit. if both look fine you can also look at the fusing rollers.
weird, this problem accours almost only in lazerjets. anyway, you can try the following:
1. Unplug data cable.
2. plug power cord directly to socket (as opposed to extension) .
3. remove memory card.
4. changed toner cartridge.
also, the info in the following page may assist you: