Thanks for the tips - but you are a little over my head with terms. I did find one very suspicious looking item but I haven't any idea what the part is or how to get at it. I opened the rear door of the printer, next to the power cord, and lifted the black plastic piece near the bottom...
I have 2 LaserJet 5 B&W laser printers, one with TONS of output and one that is used much less frequently. They are both about the same age. Both printers are leaving a vertical smudge about 3/4 inch wide down the middle of the page. Not every time, but much of the time, sometimes very faint...
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