Thanks, Paul, that's reassuring. A while back got the same noise from my venerable R1800, I had been doing the shoeshine underhead cleaning with a paper towel - forgot to remove the towel! Dumb mistake... there again, I quickly pulled the power plug, removed the towel, and the carriage reset itself. Immediately made a print, and all was well. Whew...
Thanks for the tip on cleaning the carts, too.
Best regards,
Paul