HP LaserJet 1100 All-in-One Printer series - Manual (Page 105)

EN Finding the solution 95
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Are you currently copying or printing?
Wait for the copy or print job to be completed before scanning.
Is the original loaded correctly?
Verify the original is loaded correctly: narrow side first, top down in the
scanner paper input tray with the side-to-be scanned facing forward.
See “Loading Copier/Scanner originals.”
Is the scanner correctly connected and latched to the printer?
The scanner must be connected and the attachment lever latched.
See the Quick Reference Guide included with your scanner for
attachment instructions. See “Removing the scanner” for instructions
on removing the scanner.
CAUTION To prevent damage, unplug the printer before checking the scanner
connection.
Is the wrong printer selected?
Verify the HP LaserJet 1100 is selected as the current printer when
you print.