It wasn't theory. Until Xerox eliminated my position, I repaired Tektronix printers from their introduction. I understood you to have swapped an 840 printhead into an 8200 or an 850. I would be very curious how that was done. Great if it worked.
As far as inks, we sold many printheads that...
See if you can remove the waste tray. If not, there is ink build up that may restrict movement of the printhead. The other possibility is the cam shaft behind the maintenance roller has cracked pawls. This throws the maintenance roller out of position.
If there was a sheet of paper wrapped around the preheater entry roller (below the chrome guide) and was removed by pulling, chances are the paper pass flag is dislodged or broken off. These are gravity held and paper pushes them up out of the interupter. If broken off, the printer still thinks...
None of these models can swap printheads outside of their own nomenclature. The firmware will not handshake with the image processor. The inks between models are not compatible chemically. If mixed, they will coagulate and clog the jets.
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