How about internal prints, like the management list or configuration page? Do you get any of the original image?
If you emergency stop the machine mid-print, is there a properly developed latent image on the belt? I'm thinking probably not. Is there a properly developed latent image on the black drum? If yes, perhaps there is a primary transfer charge issue.
Can you cheat the waste bottle sensors, and see if the black drum is rotating? If the black developer or drum were not rotating you might get an image like this. Or if the laser was not writing the image ... but you've replaced the laser.
Just speculating. Maybe this will start you in another direction. =^..^=
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