We have an 8000XL that is randomly giving this error during regular printing. When I test the stacker in service it all checks out aside from one area. When I run the Kickers test 1 or 10 cycles at all speeds it works fine but when I run the Kickers and rollers test it will say 'Executing diagnostics....' (see pics) but never does anything, I can't even cancel out of it. It gets stuck and I have to do a shut down the unit.
It seems like a logic problem. HP support had no answer and suggested the main board. Seems like an easy cop-out answer to me.
-Terry
