I have taken the printer to pieces and cleaned surfaces and contacts, replaced 4 capacitors on the dc controller PCA (high esr), but the problem persists. Similar results with engine test.

Other things I have tried:

Removing the 45deg mirror to show that it was the laser causing the blackness. Yes, it did remove the blackness, but putting the mirror back did not bring back the blackness until a day or so later ( I did try to keep everything as dark as possible).

Another inconsistency was that after a rest of several hours, I found the text of the test page was not initially visible within the blackness, but was visible on the second and subsequent attempts.

Also noticed that the text repeats itself at 75mm (circumference of drum?) suggesting the image on the drum is not being erased.

My assumption is that it's the high voltage power supply that is failing and giving inconsistent results and has nothing to do with the original paper jam. How do I repair the HVPS, as I can't buy a new one.

Images show my printout and what it should look like.

⟐ Edited by author December 26, 2025 at 3:45 MST