Here is a new one.
A brand-new Xerox Phaser MFP (Multi-Function Printer) with an ADF (Automatic Document Feeder).
Printer work fine. Scans work fine on the glass. Copies work find on the glass.
However, the ADF won’t feed; it claims that there is paper on the glass.
The issue? Too much light in the room. Yes; this Phaser apparently writes in blood. Or steals your soul. Or something.
Actually, the light reader is just too sensitive. Sigh…