Terry Coombs wrote:

My HP 3510 printer is giving me fits , keeps throwing a paper jam error
even with no paper in it .

I've fixed a couple printers by browsing this site :
http://www.fixyourownprinter.com/

Just search for the model #. They have info on some of the arcane fixes
where solenoids that trip clutches lose the pad that stops the armature from
dropping too far away from the coil. Causes VERY bizarre malfunctions on
certain models.

Jon