Printer and Photocopier Troubleshooting and Repair Collection : Streaks on laser printer output         
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Streaks on laser printer output

(From: Bruce Tomlin (btomlin@crl.com).)

There is also a drum cleaner blade which cleans excess toner off of the drum between pages. On a regular copier, this would show as streaks or even a double image that only shows when you print more than one page at a time.