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You need to replace either the pickup roller or the separation pad (or, optimally, both at the same time) - both should be removable without tools, they just snap in. You can order new parts at http://partsurfer.hp.com - shouldn't be more than $20 worth of parts. You can help reduce the problem slightly by roughing up the rubber on the pickup roller and the cork on the separation pad by scuffing both with a light grade of sandpaper, just to give it some tooth. But replacing them is best, it'll fix it!
on both sides of pickup rollers there are white bushings rotate the white bushings towards you
Remove the left-side bushing by sliding the bushing to the left. Slide the roller and shaft toward the left until they clear the hole in the right-side bushing, and
then lift the right end of the shaft. Slide the roller and shaft toward the right and lift the roller and shaft together out of the printer.
install your new roller then reverse this process to reinstall
this is usually one of 2 problems either you have a bad toner cartridge (most of the time this is the issue) or you have a bad fuser. if replacing./trying another cart does not fix your problem machine is most likley in need of a fuser.
to replace fuser
remove back cover
Remove the fuser-cable cover by releasing one tab on the cover, and then rotating
the back of the cover toward the center of the printer.
Disconnect two cables at the left, inside, of the printer
Disconnect the fuser cable at the right side of the printer
Remove four screws securing fuser
Tilt the fuser slightly toward the back of the printer, and then slide the fuser out of the back of
reverse for reinstall
When printing from the computer, you receive a line of garbage or all of the printed output comes out on one line.
See the following:
a self-test to be sure that the HP LaserJet printer is functioning
properly. If the self-test is not correct, remove all cables and
accessories (if any) and print a self-test again. If the self-test is
still not correct, service the printer. If the self-test is correct, go
to the next step.
Reseat or replace the cable. Check
the cable for bends or pressure applied by objects resting on the
cable. A faulty cable or cables that do not meet the IEEE-1284 Standard
can cause print defects by distorting signals.