Hello,first of all,make a copy true the adf,and the next on the platen glass,if both copys are good,then the problem is inside the machine,i.e.drum unit or fuser roller damage.
if the strikes only occurs,by using the adf,then cleaning the scanner platen glass,it is the small glass unit!!! on the left side,from the big platen glass..
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Replace the Drum Unit, Do you know how to rebuilt this unit, if not you can get an after market product, The Drum unit release is in the Middle of the Copiers you will see a door , open the door, then ONLY , and i do mean ONLY, touch the "Green" release lever for the drum take it out and replace it or rebuilt it f you now how, if this does solve it, which i am certain it will but, if it doesn't something is wrong with the fusing unit and needs to be dismantled, wish i could give you our contact info however, been informed not too so sorry. rules of fixya.com
Resolving white, light lines or streaks (eliminate light stripes)
From the printer, print the Troubleshooting Print Quality Pages.
With Troubleshooting highlighted, press the OK button. Scroll to Print Quality Problems by pressing the Up or Down Arrow button. Press OK.
Scroll to Troubleshooting Print Quality Page. Press OK. Evaluate the Light Stripes Test page for missing printhead jets (missing cyan, magenta, yellow or black color bars).
Clean the maintenance unit's wiper blade and empty the waste tray. A dirty maintenance drawer wiper blade can cause white lines and weak or missing printhead jets. Using a clean lint-free cloth or a paper coffee filter, gently clean the blade with a wiping motion across the entire length of the wiper blade.
Each color has its own laser. Use the cleaning wand in the front door to clean the lens covers for each color. You will need to remove the waste toner cartridge in front of the the slots to do this. If that does not cure the problem, you will need to replace the developer housings for the colors that are streaking.
The manual can be downloaded at: www.lpscomputer.com/ec/Phaser_7700_Service_Manual.pdf
You can go into the trouble shooting menu and do the "eliminate Light stripes" procedure a few times. Then you can do Jet substitution from the same menu. If that does not work then most likely you need a new print head. If you have used non xerox ink sticks that is your most likely cause of the problem. cheaper is not always better
It sounds like excess toner has built up in or around the imaging drum. I would *carefully* remove the toner and drum (can be messy) and use some canned air to clean the inside out. If you are still getting these streaks, it might be time to get a new drum (DR 400) as you are supposed to replace the drum every 6 to 8 times you change the toner cartridge.