Yes, thank you, ***** ***** it could be the paper sensor. Do you know how to identify it on my particular printer model?
My untrained eyes cannot spot anything that matches your description. Space is very confined and I think I may have to remove a side panel to get a better view and better access.
Cleaning the area with a cloth hasn't produced much dust and in fact I'd tried that already w/o success.
Thanks anyway for your expert advice, even though the problem persists..
Hard reset hasn't helped, either. I think further exploration by a technician will be required.
Although I am still stuck with the problem, I appreciate your advice and will submit a positive rating. Thank you.