Hi, George
I do not know about LJ 810 Printer, but we have old 2680 and new D640
printer.
First few month, It jammed too much, we called HP CE they virtually upgrade
all the parts
ROM and all kind of mechanical Part. Now It is very operatable 1- 3 jams
per day much better than jam every minutes. I think your HP CE have to be
Overhaul your D640 printer too, like ours.

hopy this help
Peter Chong.
George Willis wrote in message ...
>Our HP30000 ship uses 4 HP5000 C30D (30 ppm) printer that are now 6 yrs
>old that are constantly breaking down or hampering us with unacceptable
>print quality problems. We have heard that the  HP D640 printer suffers
>from constant paper jam problems and does'nt look like a good
>replacement for us.
>
>Does any have any feedback for the HP LaserJet 8100 printer that was
>released last week? Perhaps other non-HP printers?
>
>George
>[:}>
>