HP 1100A - Manual (Page 116)

116 Chapter 9 Troubleshooting the Copier/Scanner EN
Removing the scanner
To remove the scanner from the printer, follow the instructions below:
CAUTION Removing the scanner without first unplugging the printer may damage
your printer and scanner. The printer must also be unplugged before
reinstalling the scanner on the printer.
1 Unplug the printer to turn it off.
2 Move the scanner lever, located under the scanner, from the left
to the right to disengage the connector.
3 Grasp the scanner on each side, rotate the bottom portion
away from the printer, and then lift the entire scanner up and
clear from the printer.