Hp 1536dnf

[tonerallover]

I have several of these machines and every one is giving me adf issues. I can put an original in the adf and it will either chatter and read a "mispick" or it will pull the paper through and then just go back to the ready state.. Has anyone had these issues or have any idea what the deal is? I have tried changing main board and all the obvious solutions. Also I can put an original on the glass and print fine. TIA

[redcow]

You've done everything except change the Scanner/Copier assembly.
If this thing is still on warranty..use it, call HP.