Wheel won't drop down to feed paper in my hp j6400 printer

SOURCE: hp p1006 wont load/feed paper

i know this is not perfect but...
paper runs out during printing... so
1)open the front cover
2)close the front cover
3)IT WORKs

If i helped you please rate me

SOURCE: won't feed paper

I had the same problem it was not feeding paper, and was giving the out of paper msg, I checked and the feed roller ( small black one in contact with paper) was not rotating, Also when the back cover is removed the roller also did not rotate. I took apart the printer and found that a white gear with the encoder disc (clear film with printed lines) on the central shaft was slighty broken, The shaft is knurled but is a poor design. I had to drill through the gear and the shaft to fit a pin to be able to fully secure the gear to the shaft. Kevin

SOURCE: hp laserjet p3005dn tray1 manual feed problem

you can choose mp first in "paper handing" printer menu or print tray1 is A4 default in properties of printer software.

SOURCE: hp 3310 paper feed

Take off the back of the printer - there is a door running almost the full length which has a latch. Using regular rubbing alcohol and a Q-TIP(R) cotton swab, clean the little rubber rollers which grab the paper from the tray. The rollers you need to clean will be low and on the left as you look at the back of the printer and they are about 2 inches inside the printer. There are 2 of them. Paper dust builds up on them and they fail to grab the next sheet of paper, causing the error message. Works every time!

SOURCE: HP PSC 1350 printer won't feed paper

Check the gear on the left side of your printer where the disk encoder strip is attach,the gear is not holding the metal shaft your need to replace that gear. The problem is in the inner hole where the shafting is attached.